Showing papers on "Pervious concrete published in 2011"
TL;DR: In this article, the authors developed a mathematical model to characterize the relationship between compressive strength and porosity for porous concrete by analyzing empirical results and theoretical derivations, which was derived from Griffith's theory.
402 citations
TL;DR: In this paper, a methodology to proportion pervious concrete mixtures of desired porosity using high or low cement paste contents is provided along with the compressive response of these mixtures.
143 citations
TL;DR: In this paper, the performance of laboratory and field produced pervious concrete mixtures as well as field cores were evaluated and compared through laboratory performance tests, including air voids, permeability, compressive and split tensile strengths, and freeze-thaw durability tests.
133 citations
TL;DR: In this paper, temperature data from an instrumented site in Iowa and heat storage phenomena for various weather patterns are presented. And they support the conclusion that even though pervious concrete may have a much lower SRI than traditional concrete made with similar materials, it can be considered a cool pavement.
Abstract: As the world becomes more urbanized, concerns over the urban heat island (UHI) are more pronounced. Increased urban temperatures have a negative affect on the natural and human environment by producing increased energy usage and smog formation. Pervious concrete pavement is one technology that may help mitigate increased urban temperatures. Temperature data from an instrumented site in Iowa and heat storage phenomena for various weather patterns are presented. The site contains both pervious concrete pavement with a solar reflectance index (SRI) of 14 and traditional concrete pavement with an SRI of 37. Leadership in Energy and Environmental Design (LEED) accepted a high SRI (>29) as one method to characterize a cool surface. Heat capacities of both systems were studied along with a sensitivity analysis of the inputs. The research supports the conclusion that even though pervious concrete may have a much lower SRI than traditional concrete made with similar materials, it can be considered a cool pavement ...
123 citations
TL;DR: In this paper, the authors evaluate different pervious concrete test specimen preparation techniques in an effort to produce specimens having properties similar to in-place pervious pavement pavement, including infiltration rate, density, and porosity.
113 citations
01 Nov 2011
TL;DR: In this article, the photocatalytic effect of titanium dioxide (TiO2) applied onto pervious concrete pavement to remove some of these pollutants from the air was investigated.
Abstract: The United States is facing the problem of controlling air pollution from vehicle emissions, especially in growing urban areas This study investigates the photocatalytic effect of titanium dioxide (TiO2) applied onto pervious concrete pavement to remove some of these pollutants from the air, so that pervious concrete pavement can be installed for two sustainable applications: storm water management and air pollutant removal The photocatalyst, TiO2, activates with UV radiation to oxidize air pollutants, such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) This study compared different methods to apply TiO2 onto the surface of pervious concrete and measured the photocatalytic activity of the concrete, the infiltrating characteristics of the pervious concrete, and its ability to withstand environmental impact High pollutant reductions were seen with a driveway protector mix, a commercial water-based TiO2 preparation, TiO2 in water, a cement–water slurry with low cement concentration, and the commercial PURETI coating It was found that nitrogen oxide (NO) was efficiently removed with each of these treatments, while VOCs displayed more variability in removal efficiency Different coating methods can cause different degree of infiltration rate reduction depending on the specific design of coating materials while none of the application methods decreased the infiltration rates below levels applicable for standard hydrological design When pervious concrete was compared to traditional concrete, pervious concrete showed higher NO reductions
106 citations
TL;DR: In this article, the performance of pervious concrete with a particular focus on abrasion resistance was evaluated using laboratory tests and the results showed that adding latex desirably improved the strength and abrasation resistance of PCPC, whereas fiber did not show a significant effect on the mechanical properties.
Abstract: High porosity with interconnected voids between aggregate particles is the primary characteristic of portland cement pervious concrete (PCPC), which, however, causes a significant decrease in its strength and abrasion resistance. In this study, latex and fiber were added to improve the abrasion resistance of PCPC mixtures. Laboratory tests were conducted to evaluate the performance of latex-modified pervious concrete with a particular focus on abrasion resistance. Test results show that adding latex desirably improved strength and abrasion resistance of PCPC, whereas fiber did not show a significant effect on the mechanical properties of PCPC. In addition, the asphalt pavement analyzer (APA) abrasion test was found to be feasible for evaluating the abrasion resistance of pervious concrete.
99 citations
TL;DR: In this article, the authors evaluate and compare the effect of each pervious pavement type on water storage under specific conditions in northern Spain over time, and show that the pervious surface materials chosen influence the behaviour of pervious pavements for storm-water management.
Abstract: Pervious pavements are rainwater control systems that filter and store rainwater, reducing runoff formation and the risk of urban flooding. In addition, these sustainable urban drainage systems provide an additional source of water for non-potable use, which implies a cost and energy saving. An experimental 45 place parking lot consisting of five different types of pervious pavements was constructed in a public park in Santander, northern Spain. The purpose of this research is to evaluate and compare the effect of each pervious pavement type on water storage under specific conditions in northern Spain over time. The main results showed that the pervious materials chosen influence the behaviour of pervious pavements for storm-water management. Firstly, pervious surface materials had a greater effect than the geotextile layer. Nevertheless, the differences in terms of storm-water management using the different pervious pavement types tested still need to be confirmed. Clustering techniques showed three different behaviours according to the pervious surface used. Moreover, porous asphalt (PA) and porous concrete (PC) showed the highest correlation (86%), whereas plastic grid pavers (PGC) showed least correlation with the others. The capacity of pervious pavement to manage urban storm-water was demonstrated and this experimental parking area provided an alternative water source supplying enough water to irrigate a public garden for almost an entire month.
57 citations
TL;DR: In this paper, the root activity through CO 2 flux and also measured root production of American sweetgum under impervious concrete, pervious concrete and no pavement conditions (control).
47 citations
TL;DR: Workability and compaction density testing methods were developed in order to ensure constructability and placement consistency of pervious concrete for pavement overlays as discussed by the authors, which can be used as an overlay material over traditional concrete to reduce noise, minimize splash and spray, and improve friction as a surface wearing course.
Abstract: The results of studies to develop pervious concrete for use as an overlay material over traditional concrete to reduce noise, minimize splash and spray, and improve friction as a surface wearing course are described in this paper. Workability and compaction density testing methods were developed in order to ensure constructability and placement consistency. The mixture testing matrix consisted of evaluating aggregate type and gradation, cementitious material amounts and composition, and various admixtures. Selected mixtures were tested for permeability, strength, workability, overlay bond strength, and freezing-and-thawing durability. The selected mixture was self-consolidating and slip-formable and was placed at the MnROAD testing facility during late October 2008. The test results indicate that pervious concrete mixtures can be designed to be highly workable, sufficiently strong, permeable, and have excellent freezing-and-thawing durability, thus being suitable for pavement overlays.
46 citations
TL;DR: In a recent survey, the durability and condition of 29 pervious concrete pavements built in a wet, hard freeze environment were assessed, and 33 core samples were collected as mentioned in this paper.
Abstract: In a recent survey, the durability and condition of 29 in service pervious concrete pavements built in a wet, hard freeze environment were assessed, and 33 core samples were collected. Following up on this survey, this paper identifies some of the common subsurface distresses observed in the core samples with optical microscopy instruments. In the distressed samples, cracks went through the aggregate, paste, and interfacial transition zone (ITZ). The cracks were similar to cracks in conventional concretes that formed due to known freeze/thaw damage. In addition to cracking patterns, it was discovered that none of the 33 pervious concrete samples contained the recommended quantity or spacing of entrained air bubbles. There was a lack of entrained air bubbles despite the addition of air-entraining admixtures to all of the pervious concrete mixtures. It is unknown if the lack of entrained air bubbles contributed to the cracks in the pervious concretes.
TL;DR: In this paper, the authors examined the effects of materials and proportions and curing conditions on the freezing-and-thawing durability of pervious concrete under simulated field conditions, including slow cyclic freezing and thawing, wet-dry environments, and salt applications.
Abstract: This research investigates the durability of pervious concrete under simulated field conditions, including slow cyclic freezing and thawing, wet-dry environments, and salt applications. Specifically, this research examines the effects of materials and proportions and curing conditions on the freezing-and-thawing durability of pervious concrete. Generally, air curing causes a dramatic reduction in the freezing-and-thawing durability as compared with water curing. Silica fume additions are observed to improve the performance of water-cured pervious concrete during slow freezing and thawing while causing a significant drop in the performance of air-cured specimens. Polypropylene fibers are seen to enhance the resistance of pervious concrete to repeated freezing and thawing, whereas salt applications are noted to aggravate the deterioration. In addition, wet-dry cycles are found to slow down the freezing-and-thawing damage development when the duration of the wet cycle is less than 3 days.
19 Oct 2011
TL;DR: Gajanan M. Sabnis Sustainability in the Cement Industries and Chemical Admixtures Thomas B. Carter as discussed by the authors The Principles of Sustainable Building Design N. Subramanian and G. Gajanan Sabnis.
Abstract: Introduction Gajanan M. Sabnis Sustainability in the Cement Industries and Chemical Admixtures Thomas B. Carter The Principles of Sustainable Building Design N. Subramanian Sustainability through Thermal Mass of Concrete William Juhl Concrete Pavements and Sustainability Thomas J. Van Dam and Peter Taylor Roller Compacted Concrete Pavements: A Sustainable Alternative Chetan Hazaree Pervious Concrete for Sustainable Development Karthik H. Obla and Gajanan Sabnis Heat Island Effects Pushpa Devanathan and Kolialum Devanathan Future Sustainable City: The Case of Masdar City Gajanan M. Sabnis Sustainability and Rehabilitation of Concrete Structures Gopal Rai Global Sustainability and Concrete Edward J. Martin Index
TL;DR: In this paper, the authors reveal the mechanical performance and permeability of pervious concrete with regard to volume fraction of the binder, type of binder (cement paste and styrene-butadiene latex modified paste), and aggregate to cement ratio.
Abstract: This paper investigates recycled aggregate (RA) obtained from construction waste, with a particular focus on the properties of pervious concrete. The authors reveal the mechanical performance and permeability of pervious concrete with regard to volume fraction of the binder (binder/voids between aggregate), type of binder (cement paste and styrene-butadiene latex modified paste), particle size of aggregate, and aggregate to cement ratio. The three nominal diameters of the aggregate were 3.6 mm, 7.2 mm and 11.1 mm. The volume fraction of the binder ranged between 0.3 and 0.5, by varying the nominal diameter of the aggregate. The authors designed and cast concrete specimens with water to binder ratios (w/b) of 0.35. The authors conducted laboratory testing of mixture proportions for various properties, such as workability, unit weight, compressive strength, flexural strength, porosity and permeability. The results show that mechanical strength decreases as permeability increases. Decreasing the aggregate to the cement ratio enhances mechanical strength but may reduce permeability, and styrene-butadiene latex greatly enhances flexural strength. From an economic point of view, the authors' recommendation to achieve optimal strength and permeability in pervious concrete using recycled coarse aggregate is: w/b=0.35, nominal diameter of 11.1 mm for the recycled aggregate; the volume fraction of 0.5 for the binder; and aggregate to cement ratio of 3.9. The permeability coefficient for the above mentioned mix was 0.33 cm/sec with the 28-day compressive strength and flexural strength reaching 12.6 MPa and 2.1 MPa, respectively. The mixture for RA pervious concrete developed in this study satisfies the typical requirement for concrete sidewalks and is thus applicable for civic paving projects.
TL;DR: In this article, a quick surface infiltration test is presented for assessment of pervious concrete (PC) maintenance needs on small sites, which can assess whether the PC pavement surface infiltration rate (SIR) is above or below 500 h-1.
Abstract: In this paper, a quick surface infiltration test is presented for assessment of pervious concrete (PC) maintenance needs on small sites. Tests were conducted on PC sidewalk sections at Auburn University in Auburn, Alabama. Performance of a quick field infiltration test (QFIT) was compared with a modified double ring infiltrometer test (MDRIT). The more sensitive MDRIT results were used in the second part of the study to evaluate the effectiveness of two low-cost PC maintenance practices: (1) pressure washing and (2) pressure washing with power blowing. Results indicate both maintenance practices improved PC sidewalk infiltration rates an average 20-fold, with an almost 200-fold increase observed on sites cleaned by combined pressure washing and power blowing. Because the QFIT method can assess whether the PC pavement surface infiltration rate (SIR) is above or below 500 cm h-1, this rapid, low-cost test can be recommended as an option for small-scale property owners to assess the need for pervious paveme...
TL;DR: In this paper, an existing pervious concrete pavement was analyzed for stiffness and fatigue by means of Westergaard's theory of a medium-thick plate on a Winkler foundation, and the stiffness evaluation compared the responses of pervious and conventional concrete pavements to falling weight deflectometer stresses and to models created in ISLAB2005.
Abstract: Pervious concrete pavement must perform as both a stormwater management tool and a pavement. While much research has focused on porosity and permeability of pervious concrete, few guidelines exist for structural analysis and design of such pavement. In this paper, an existing pervious concrete pavement was analyzed for stiffness and fatigue by means of Westergaard's theory of a medium-thick plate on a Winkler foundation. The stiffness evaluation compared the responses of pervious and conventional concrete pavements to falling weight deflectometer stresses and to models created in ISLAB2005. Although pervious concrete had a lower modulus of elasticity than conventional concrete pavement, Westergaard's model adequately described the behavior of pervious pavements. Additionally, a fatigue analysis of pervious concrete was completed through use of the StreetPave fatigue model.
TL;DR: WPPs have a 16% higher evaporation rate than impermeable pavements, which can lead to a better urban climate and the broad field of application of the pervious concrete paving stone increases the importance in regard to the urban climate.
16 May 2011
TL;DR: In this article, a simulated field pervious concrete pavement was used for highway design and construction, and four mixtures with void contents ranged from 18.8 to 31.9% and densities from 1,890 to 2,034 kg/m3.
Abstract: Pervious concrete pavement is air and water permeable, the soil underneath can be kept wet and rainwater can quickly filter into ground, allowing groundwater resources to renew in time. Pervious concrete also possesses many other advantages including sound absorption and skid resistance and is therefore suitable for use in Taiwan's rainy and humid environment. However, the prevalence of air voids result in low strength, so pervious concrete has not been suitable for use in surfacing roads with heavy traffic loadings. In this study the authors sought to determine the suitable mix of cement, silica fume, superplasticizer, steel fiber, course aggregate and so on for a pervious concrete pavement strong enough for road surfacing. The results showed that the compression strength of one pervious concrete core specimen from the simulated field site was up to 275.7kgf/cm2 and exceeded the ordinary concrete structure specification. The flexural strength of one pervious concrete sawed specimen from the simulated field site was up to 48.11kgf/cm2 and exceeds the highway rigid pavement specification (45 kgf/cm2). Four mixtures were trialed with void contents ranged from 18.8 to 31.9% and densities from 1,890 to 2,034 kg/m3. The field permeability testing method developed for asphalt pavements has been found to work well for pervious concrete. Water penetration was very good with field permeability test showing about 1,100ml/15sec. This study of the simulated field pervious concrete pavement will be valuable for highway design and construction.
01 Jul 2011
TL;DR: In this article, the authors present the results of the largest and most comprehensive study to date on portland cement pervious concrete (PCPC), which is designed to be widely accessible and easily applied by designers, producers, contractors and owners.
Abstract: This report presents the results of the largest and most comprehensive study to date on portland cement pervious concrete (PCPC). It is designed to be widely accessible and easily applied by designers, producers, contractors, and owners. The project was designed to begin with pervious concrete best practices and then to address the unanswered questions in a systematic fashion to allow a successful overlay project. Consequently, the first portion of the integrated project involved a combination of fundamental material property investigations, test method development, and addressing constructability issues before actual construction could take place. The second portion of the project involved actual construction and long-term testing before reporting successes, failures, and lessons learned. The results of the studies conducted show that a pervious concrete overlay can be designed, constructed, operated, and maintained. A pervious concrete overlay has several inherent advantages, including reduced splash and spray and reduced hydroplaning potential, as well as being a very quiet pavement. The good performance of this overlay in a particularly harsh freeze-thaw climate, Minnesota, shows pervious concrete is durable and can be successfully used in freeze-thaw climates with truck traffic and heavy snow plowing.
TL;DR: In this paper, the performance of a pervious concrete infiltration basin over a 2-year cycle is presented, which consists of three linked infiltration beds lined with geotextile filter fabric, filled with coarse aggregate, and overlaid with perviouscrete.
Abstract: The use of infiltration storm-water best management practices (BMPs) has become a more commonly used approach as a means of reducing postdevelopment runoff volumes in many areas throughout the United States. Although studies regarding the performance of infiltration BMPs are emerging, much remains to be learned about their design, construction, and operation. The increase in knowledge will improve the performance and longevity of these BMPs. The performance of one such infiltration basin over a 2-year cycle is presented in this paper. The study site is a pervious concrete infiltration basin BMP built in 2002 in a courtyard common area at Villanova University. The system consists of three linked infiltration beds lined with geotextile filter fabric, filled with coarse aggregate, and overlaid with pervious concrete. The natural soil beneath the infiltration BMP is a silty sand. The BMP is extensively instrumented to facilitate water quantity and quality research. Both water-quantity and -quality results are presented. The water-quantity analysis showed that the performance of the basin was directly related to its infiltration characteristics. The infiltration rate of the silty sand is cyclic, with higher rates during warmer periods and lower rates during colder periods. The water quality analysis investigated the pollutant reduction for chloride, copper, nitrogen, and phosphorus from the inlet to the surface-water outlet of the structure, as well as differences in pollutant concentration levels between the basin, surrounding ground, and varying soil layer elevations beneath the basin. In general, the pollutant reduction to the surface waters was greater than 90% from inlet to outlet, primarily influenced by the infiltration of the storm water into the natural soils below the BMP. The pollutant concentration of the infiltrating runoff was found to be higher than expected in the area adjacent to the bed when compared to concentration levels found at a similar depth beneath the infiltration bed. Comparison of pollutant concentration levels, as the water moved from within the storage bed to the soil beneath the bed, were shown to vary, with statistical differences found for mean concentration levels of both pH and copper levels; and no statistical differences were found for conductivity, total phosphorous, and chloride at each elevation.
TL;DR: The aim of this research was to obtain a good performance of pervious pavements that offered simultaneously a positive urban service and helped to harvest rainwater with a good quality to be used for non potable demands.
Journal Article•
TL;DR: In this paper, a Canada wide study has been initiated to evaluate the performance of pervious concrete pavement in the Canadian freeze-thaw climate and the results indicate that it is essential to agitate the debris in the voids to remove and clear as much material as possible.
Abstract: Pervious concrete pavement offers sustainable solutions to urban growth challenges by providing a stormwater management alternative and benefits to the ecosystem and community. Maintenance may not always be required but is likely needed in general to maintain adequate performance of pervious concrete. A Canada wide study has been initiated to evaluate the performance of pervious concrete pavement in the Canadian freeze–thaw climate. This paper presents the results to date related to the work that has been performed in evaluating maintenance methods at five field sites across Canada. In general, the results indicate that it is essential to agitate the debris in the voids to remove and clear as much material as possible. The maintenance methods that have been evaluated are the following: sweeping using a broom or street sweeper; rinsing the surface with a garden hose or large hose; vacuuming; and power washing.
TL;DR: In this article, the structural properties of porous concrete are modeled using a discrete element method (DEM) and the mechanical behavior of a sample subjected to compressive and tensile forces is estimated using two-dimensional Particle Flow Code (PFC2D).
Abstract: – Porous concrete is a mixture of open‐graded coarse aggregate, water and cement. It is also occasionally referred to as no‐fines concrete or pervious concrete. Due to its high infiltration capacity, it is viewed as an environmentally sustainable paving material for use in urban drainage systems since it can lead to reduced flooding and to the possibilities of stormwater harvesting and reuse. However, the high porosity is due in the main part to the lack of fine aggregate particles used in the manufacture of porous concrete. The purpose of this paper is to present a numerical method to understand more fully the structural properties of porous concrete. This method will provide a useful tool for engineers to design with confidence higher strength porous concrete systems., – In the method, porous concrete is modelled using a discrete element method (DEM). The mechanical behaviour of a porous concrete sample subjected to compressive and tensile forces is estimated using two‐dimensional Particle Flow Code (PFC2D)., – Three numerical examples are given to verify the model. A comprehensive set of micro‐parameters particularly suitable for porous concrete is proposed. The accuracy and effectiveness of simulation are confirmed by comparison with experimental results and empirical equations., – The experimental investigations for porous concrete described in this paper have been designed and conducted by the authors. In addition, the type of two dimensional PFC analysis presented has rarely been used to model porous concrete strength characteristics and from the results presented in this paper, this analysis technique has good potential for predicting its mechanical properties.
Patent•
13 Apr 2011
TL;DR: In this article, a high-strength plant growing type porous concrete and a preparation method thereof are presented. But the preparation method comprises the steps of: firstly crushing the waste concrete or the natural crushed stone aggregate to be used as aggregate for later use; smashing the fully dried rice straw for later uses; stirring the aggregate and a proper amount of water for a period of time; putting a proper amounts of cement, the smashed rice straw and the water reducing agents into a stirrer for stirring; and finally, adding rest water and cement to be stirred.
Abstract: The invention discloses a high-strength plant growing type porous concrete and a preparation method thereof. The concrete comprises the following ingredients in proportioning by weight: water, cement, waste concrete or natural crushed stone aggregate, water reducing agents and rice straw. The preparation method comprises the steps of: firstly crushing the waste concrete or the natural crushed stone aggregate to be used as aggregate for later use; smashing the fully dried rice straw for later use; stirring the aggregate and a proper amount of water for a period of time; putting a proper amount of cement, the smashed rice straw and the water reducing agents into a stirrer for stirring; and finally, adding rest water and cement to be stirred. The high-strength plant growing type porous concrete can replace masonry flagstone with the strength of lower than M15, is applied to engineering projects such as raceways, parking lots, side slopes, riverbanks and the like and helps the growth of plants and restores the ecological environment destroyed by construction under the application condition.
TL;DR: In this article, a new laboratory evaporation measurement device (LEMD) was developed to estimate the evapore rates of urban surface materials, which can be measured using two different methods concurrently.
01 Dec 2011
TL;DR: In this article, the design, construction, and early performance of three pervious concrete test cells construction at MnROAD in 2008 were described. But, concerns about the ability of pervious pavements to perform in Minnesota's extreme climate, maintenance needs, and effect on groundwater quality needed to be understood.
Abstract: Local agencies are interested in pervious pavements' ability to reduce storm water runoff by allowing direct infiltration through the pavement structure. However, concerns about the ability of pervious pavements to perform in Minnesota’s extreme climate, maintenance needs, and effect on groundwater quality needed to be understood. This report includes the design, construction, and early performance of three pervious concrete test cells construction at MnROAD in 2008. These cells were constructed to evaluate the performance of pervious concrete pavements on a low-volume road in a cold weather climate. The three cells discussed in this report are as follows: porous concrete overlay, pervious concrete on granular subgrade, pervious concrete on cohesive subgrade. This report has the following chapters, which uniquely discuss each phase of this project: research synthesis; mix design, concept design, and geotechnical exploration; construction sequence; initial testing; hydrologic evaluation; early two year performance; implementation; effect of sound absorption on OBSI; and acoustic properties of clogged pavements.
01 Jan 2011
TL;DR: In this article, the authors discuss common causes and identification of common and not so common pavement distresses for Portland Cement Pervious Concrete and provide suggestions for cleaning and surface repair.
Abstract: While permeable pavements have been applied in limited use in the southeastern United States since the 1970’s, only recently have they become a more wide-spread technology for stormwater management. Various industry groups have done well promoting the benefits of permeable pavements, however maintenance issues are rarely discussed in-depth. Maintenance of permeable pavements involves cleaning to restore permeability and the repair of structural and non-structural deficiencies. This paper discusses common causes and identification of common and not so common pavement distresses for Portland Cement Pervious Concrete. Methods to assess surface condition and permeability are presented along with a discussion using test section results. Suggestions for cleaning and surface repair are provided. This paper is designed to assist with selection of appropriate remediation techniques for individual levels of pervious concrete distresses.
TL;DR: In this article, a parking lot was constructed in which traditional impervious concrete was used on half of the parking lot and pervious concrete on the other half, where the traditional concrete layer was placed on natural subgrade.
Abstract: Although pervious concrete material properties, mix design, and storm water applications are well documented in the literature, the structural behavior of pervious concrete pavement systems has not been investigated. A parking lot was constructed in which traditional impervious concrete was used on half of the parking lot and pervious concrete was used on the other half. The traditional concrete layer was placed on natural subgrade. The pervious concrete portion was divided into two sections with two pervious concrete mixtures and aggregate base thicknesses of 300 and 450 mm. To better understand the behavior of traditional and pervious concrete pavement systems of the parking lot, the subgrade soil properties were characterized by using plate load testing and nuclear density gauge. Furthermore, the aggregate base layers used in the pervious concrete systems were characterized by using plate load testing. After constructing the parking lot, falling weight deflectometer (FWD) testing was performed on the t...
Patent•
23 Nov 2011
TL;DR: In this article, a manufacturing method for highly antifreezing concrete permeable bricks which are prepared by using ceramic wastes as aggregates and a compound additive is presented, which enables the problems of poor strength of permeable concrete and poor frost resistance in chilly areas to be overcome.
Abstract: The invention provides a manufacture method for highly antifreezing concrete permeable bricks which are prepared by using ceramic wastes as aggregates and a compound additive. According to the invention, ceramic wastes are recovered, crushed and screened; ceramic waste particles with a particle size of 1.25 mm to 5 mm are selected as aggregates for a permeable concrete surface layer; the selectedparticles are mixed with cement, pigments and the compound additive to form a surface layer material; the particle size of cobblestones at a bottom layer is 2.5 mm to 10 mm; the compound high performance concrete additive is composed of a high efficiency water reducer, an organosilicon waterproof agent and the mineral additive silica fume. The invention enables the problems of poor strength of permeable concrete and poor frost resistance in chilly areas to be overcome; the highly antifreezing concrete permeable brick prepared from ceramic waste aggregates has the characteristics of high strength, substantial permeable effects, good frost resistance, etc., is an environment-friendly construction material, and is especially applicable to ground laying of urban squares, commercial streets, sidewalks, community activity places, parking lots and the like in urban construction in chilly areas.