Showing papers on "Pervious concrete published in 2021"
TL;DR: In this paper, the authors investigated employing recycled concrete aggregate (RCA) and pozzolanic additives as a partial replacement (PR) of natural coarse aggregate (NCA), and Portland cement, respectively.
126 citations
TL;DR: In this paper, the pore size distributions of pervious concrete and its permeability reduction behavior are studied by laboratory tests, and the extent of the reduction in permeability is addressed by designing the penetration test for 21 groups of perviously concrete mixes with varying aggregate gradations and specimen thickness.
88 citations
TL;DR: In this paper, a modified method of incorporating biochar (BC) particles into pervious concrete as hygroscopic filler was introduced to prolong its evaporative cooling effect, which significantly reduced the albedo.
83 citations
TL;DR: In this paper, it is postulated that the interconnected porosity may cause a serious reduction in strength, and it is assumed that porosity is correlated with high water permeability.
Abstract: Pervious concrete needs to have many pores to achieve high water permeability, but excessive porosity may cause a serious reduction in strength. Herein, it is postulated that the interconnected por...
67 citations
TL;DR: In this article, the use of additives, alternative binders, fillers, and fibers from natural sources and waste streams and their impact on pervious concrete performance parameters is reviewed.
64 citations
TL;DR: In this paper, the performance of pervious concrete subjected to rapid freeze-thaw (F-T) cycling, calcium leaching and the combined attack of calcium leach and F-T cycling was evaluated.
60 citations
TL;DR: In this article, coal fly ash, coal bottom ash, and rice husk ash (RHA) were used as partial replacements of ordinary Portland cement in pervious concrete, and the results indicated that the replacement of ash materials yielded an acceptable compressive strength and water permeability.
47 citations
TL;DR: In this article, the porosity, water permeability, water absorption, evaporation, compressive strength, splitting tensile strength, solar reflectance, and microstructure morphology of pervious concrete samples that are prepared by replacing a portion of cement with pulverized biochar (BC).
Abstract: Manufacturing cement in the industry is responsible for most of carbon dioxide (CO2) emissions to the atmosphere, while producing biochar (BC) reduces CO2 emissions to the atmosphere. Replacing a portion of cement with BC will be a win-win alternative to curtail CO2 emissions and simultaneously lock up BC. However, the mechanical performance and properties of concrete with BC as a cement replacement, especially pervious concrete, have not been well understood. In this study, we comprehensively study the porosity, water permeability, water absorption, evaporation, compressive strength, splitting tensile strength, solar reflectance, and microstructure morphology of pervious concrete samples that are prepared by replacing a portion of cement with pulverized BC. The replacement ratio, in weight, is set as 0%, 0.65%, 3.2%, 6.5%, 9.5%, and 13.5%, respectively. It is found that the BC content has little and/or no impact on the porosity and water permeability of the BC pervious concrete samples considered here, and that the water absorption increases with BC contents. BC pervious concrete samples show both the greater compressive strength and splitting tensile strength than conventional ones when the BC content is 0–6.5%, above which these strengths are compromised. The reason is that a small amount of BC will promote cement hydration, so hydration products generated in a higher amount respect to those without BC contribute to the development of the strength of pervious concrete. It is also found that 6.5% BC in the cement paste can decrease an albedo of 0.05, this decrease, however, can be compensated by the water absorption increment and strength improvement. Based on our findings, it is speculated that producing pervious concrete by replacing up to 6.5%, in weight, of cement by pulverized BC is feasible to curtail CO2 emissions and lock up BC.
44 citations
TL;DR: In this paper, two silane emulsion modification methods, namely the surface modification of recycled aggregate and integral modification of cement matrix, were used to raise the freeze-thaw durability of RA permeable concrete.
38 citations
TL;DR: Permeable pavement is utilised in order to alleviate flooding in towns, cities and other urban areas, but it is prone to clogging, has relatively low strength and requires regular maintenance as discussed by the authors.
Abstract: Permeable pavement is utilised in order to alleviate flooding in towns, cities and other urban areas, but it is prone to clogging, has relatively low strength and requires regular maintenance. We h...
33 citations
TL;DR: In this paper, the effects of shape and size on the compressive strength and flexural strength of porous concrete were investigated, and the results showed that porosity, aggregate size, aggregate type, cement grade could affect the strength and splitting strength.
TL;DR: In this article, an experimental program was conducted to evaluate the freeze-thaw durability of pervious concrete specimens using the JC446-91 test method, which measures the change in compressive strength and mass after exposure to freeze thaw cycles, as an alternative for ASTM C666.
Abstract: The ASTM C666 procedure is the common test method used for evaluating the freeze-thaw durability of conventional concrete, and it has been adapted for evaluating the freeze-thaw resistance of pervious concrete; however, it is argued the test method does not represent the field conditions of neither conventional nor pervious concrete This study mainly focused on an experimental program to evaluate the freeze-thaw durability of pervious concrete specimens using the JC446-91 test method, which measures the change in compressive strength and mass after exposure to freeze-thaw cycles, as an alternative for ASTM C666 Various parameters affecting the freeze-thaw durability of pervious concrete, namely water to cement ratio (W/C), air entrainment, inclusion of sand, and coarse aggregate size were experimentally examined, and the results were evaluated using statistical analysis It was observed that replacing 8% of coarse aggregate with sand and using a higher W/C resulted in higher strength and an improvement in the freeze-thaw durability Although the positive effect of air-entraining admixture (AEA) on freeze-thaw durability of pervious concrete has been manifested by previous researchers, it was not clearly observed in this study Also, change in coarse aggregate size did not significantly affect the strength and freeze-thaw durability of pervious concrete This study revealed that the conditions and number of cycles used in JC446-91 were inadequate to evaluate the freeze-thaw durability of pervious concrete, especially for strong mixes Therefore, considering the criticisms against ASTM C666 in representing field conditions of pervious concrete, more compatible and realistic test methods are required to evaluate the freeze-thaw durability of pervious concrete
TL;DR: In this article, a review of the developments in the field of pervious concrete using alternate construction materials is presented, which mainly focussed on the various properties of Pervious concrete based on the types of binders, admixtures and size of coarse aggregates.
TL;DR: In this paper, the authors used Response Surface Methodology (RSM) to design the experiments and develop models for predicting the water absorption and permeability of pervious concrete and found that rice husk ash (RHA) and calcium carbide waste (CCW) have negative effect on the durability of concrete, with RHA having the worst effect.
TL;DR: In this article, a simple design method is proposed to obtain the desired porosity by controlling density and compaction efforts, then, the w/c ratio and chemical admixture were varied and evaluated to evaluate their influence on the permeability and mechanical performance.
TL;DR: In this article, the authors presented the use of IBA for the production of eco-pervious concrete, aiming at enhancing the recycling rate of the IBA in construction materials.
Abstract: This study presents the use of IBA for the production of eco-pervious concrete, aiming at enhancing the recycling rate of IBA in construction materials. The IBA aggregates are used to replace the natural aggregates (NA) in various percentages (0%, 25%, 50%,75% and 100% by volume). The effect of IBA replacement ratios and casting methods on the mechanical properties, water permeability, porosity, density and thermal conductivity of the pervious concrete were determined. The volume stability of the pervious concrete incorporating IBA was evaluated. The results indicated that the appropriate content of IBA could benefit the mechanical properties due to the internal curing effect of IBA. However, the excessive content of IBA in the pervious concrete led to reduced water permeability, connected porosity and mechanical properties. Even so, the pervious concrete containing 100% IBA could achieve the required permeability and compressive strength for permeable pedestrian pavers (JIS A 5371). In addition, the incorporated IBA in pervious concrete causes little volume expansion from the reaction between alkalis and components consisting of metallic aluminum and glass in IBA owing to its high connected porosity. Furthermore, the pervious concrete incorporated IBA had a low density and thermal conductivity, showing the potential to be applied in thermal insulation areas.
TL;DR: In this article, coal fly ash (FA) and milled waste glass powder (GP) were used to improve the performance of pervious concrete and showed that co-utilization of FA and GP enhanced the rate and extent of compressive strength development.
TL;DR: In this article, the purification performance of different contents of biochar-modified pervious concrete on sewage was studied in order to improve the removal capacity of total nitrogen (TN) and total phosphorus (TP).
TL;DR: In this article, the authors evaluated the performance of copper slag as an aggregate for concrete applications in the metallurgic slag of the copper industry and found that it has very promising potential as an aggregated aggregate for application in the concrete industry.
Abstract: Copper slag (CS), the metallurgic slag of the copper industry, has demonstrated very promising potential as an aggregate for application in the concrete industry. The present study evaluated the hy...
TL;DR: Vegetative porous concrete (VPC) could effectively reduce the adverse impacts of engineering construction on the environment and adapt to the demands of sustainable development as mentioned in this paper. But it is not suitable for outdoor construction.
Abstract: Vegetative porous concrete (VPC) could effectively reduce the adverse impacts of engineering construction on the environment and adapt to the demands of sustainable development. In this article, sh...
TL;DR: In this article, an ultra-high performance paste was developed and used as the binder of the high strength pervious concrete, and the effects of aggregate characteristics and membrane-forming ability of the paste were investigated and their compatibility was evaluated.
TL;DR: In this article, the feasibility of using palm jaggery as an admixture in pervious concrete using Portland Pozzolana Cement (PPC) as binder is discussed.
TL;DR: In this article, the pore feature analysis of porous concrete mixes based on image analysis technique was conducted and the relative mean pore size is identified and the permeability of the pervious mix is obtained based on this image analysis.
TL;DR: In this article, the influence of aggregate size and notch depth ratio on fracture performance of steel slag pervious concrete (SSPC) was studied in the three-point bending test of a rectangular beam with a single side notch.
TL;DR: In this article, the effect of aggregate size, and aggregate/binder ratio on porosity, porosity and density of pervious concrete (PC) mixtures in the form of cylinders, cubes, and prisms of different sizes.
TL;DR: In this paper, five mixtures were made with natural and/or RAP aggregates and physical, mechanical and hydraulic (based on infiltration and clogging test) behavior was studied.
TL;DR: In this article, the application of recycled concrete aggregates (RCA) and crushed bricks (CB) into pavement materials is an ideal waste management solution, by appropriate material design, the RCA and CB could be used...
Abstract: Application of recycled concrete aggregates (RCA) and crushed bricks (CB) into pavement materials is an ideal waste management solution. By appropriate material design, the RCA and CB could be used...
TL;DR: In this article, the authors identify the differences in porosity and permeability coefficients when the mixing ratio of aggregates is different and to present the mix ratio satisfying the strength requirement of compressive specified in a specification of Korea.
Abstract: The purpose of this study is to identify the differences in porosity and permeability coefficients when the mixing ratio of aggregates is different and to present the mixing ratio satisfying the strength requirement of compressive specified in a specification of Korea. Three mix ratios were suggested by considering various aggregate sizes and three cylinders were made for each ratio. The porosities of those cylinders were evaluated through the compression and water permeability test, measuring the weight of specimens in underwater and analysis of the pictured Computed Tomography (CT) image. Experiments have shown that it is best to mix 50% for 5–10 mm aggregates, 45% for 2–5 mm aggregates, and 5% for sand in terms of strength and permeability. In addition, as the proportion of fine aggregates increased, the porosity and permeability decreased. Moreover, the effectiveness of maintenance method was also examined in this study.
TL;DR: In this paper, the authors investigated pervious concrete production involving recycled coarse aggregates (RCAs) with potential to cause environmental pollution and determined the mechanical properties, permeability, and abrasion strength of the pervious concretes.
Abstract: Significant environmental damage can result from the use of natural resources such as cement, aggregate, and water in concrete production. Thus, more sustainable alternatives for concrete production are needed to protect the environment and natural resources. In this study, lightweight pervious concrete production involving recycled coarse aggregates (RCAs) with potential to cause environmental pollution was investigated. First, RCAs were produced from concretes possessing low compressive strength and were classified. Second, pervious concretes were produced from these RCAs. Third, the mechanical properties, permeability, and abrasion strength of the pervious concretes were determined. The water/cement (w/c) ratios of the mixtures were determined to be 0.32, 0.34, and 0.36, and the aggregate/cement (a/c) ratios were selected to be 3.5 and 4. Twelve different pervious concretes were produced and tested in total. The bulk densities (BD) of the mortars varied over an interval of 1160-1080 kg/m3. The aim was to design pervious concretes with lightweight bulk densities. When the w/c ratio was 0.34, the compressive, splitting tensile and abrasion strengths were high. The compressive strength of the pervious concretes varied over an interval of 1.50-2.00 MPa. It was determined that for optimal permeability, the most appropriate w/c ratio was 0.36, and the best a/c ratio was 4. When the a/c ratio was 4, the strength values were high, and as a result, the mechanical properties were poor. With respect to aggregate gradation, it was determined that a grain size distribution of 9.50-12.50 mm was most suitable for this pervious concrete. Recycled aggregates with low strength produced low strength concrete. Therefore, the pervious concrete produced in this study is most suitable for pedestrian roads where heavy vehicle traffic does not exist.
TL;DR: In this paper, a modified mix design method based on Mohr-Coulomb failure criterion was put forward by introducing the aggregate content coefficient (ACC), which had little influence on porosity, pore area and fractal dimension of pervious concrete.