Pervious concrete

About: Pervious concrete is a research topic. Over the lifetime, 2920 publications have been published within this topic receiving 27720 citations. The topic is also known as: porous concrete & permeable concrete.

Drainage Concrete Based on Cement Composite and Industrial Waste

Abstract: The ongoing development of urbanization of our landscape has resulted in continuous demand for building materials, which are even nowadays produced mainly from primary natural resources. The continuous reconstructions and modernizations of already built-up areas are the cause of the production of construction waste which, for example, in Europe represents ¼ of the volume of all waste materials. Such a trend is inconsistent with sustainable development and considerate impact on the environment. The contemporary society is aware of these adverse impacts and it actively participates in the integration of construction waste back into production. Thanks to the systems of recycling, construction waste can return to the building industry as a fully valuable building material. The production of shaped pieces from grey cellular concrete after the autoclave process results in the creation of residual material in the form of waste blocks (rubble). This waste material is stored in dumps. The presence of these dumps has an adverse effect on the surrounding environment. This article presents the first results of a basic research dealing with the treatment process of waste cellular concrete rubble by means of a crushing process and its subsequent use as filler in the production of new porous concretes. The article presents 3 basic recipes of porous concrete, where 100 % of the filler was replaced with crushed porous concrete rubble with the fraction of 0/6 mm. The proposed recipes have been tested in regards to: density of fresh concrete mixture, concrete mixture consistency, strength, and thermal conductivity coefficient.

Evaluation of the Hydraulic, Physical, and Mechanical Properties of Pervious Concrete Using Iron Tailings as Coarse Aggregates

Abstract: Aggregates are a significant component of pervious concrete. Pervious concrete using iron tailings as coarse aggregates was prepared to study the feasibility of this approach. A mix design procedure was also used to design pervious concrete based on different target porosities. The effective porosity, measured porosity, dry density, compressive strength, and permeability coefficient of pervious concrete were studied. The results show that the mix design procedure based on a target porosity is relatively reasonable for designing iron tailing-based pervious concrete. The 28 d compressive strength of the pervious concrete decreased from 42 to 11 MPa as the effective porosity increased from 5.2% to 27.2%. The effective porosity of the equilibrium point of the compressive strength and permeability coefficient of pervious concrete was approximately 16%, where the compressive strength was 21.5 MPa, and the water permeability was 3.2 mm/s. The permeability coefficient of pervious concrete can be predicted as an exponential function of the effective porosity, and the compressive strength of pervious concrete can be predicted as a logarithmic function of the effective porosity.

A Lab Study of Photo-Catalytic Oxidation and Removal of Nitrogen Oxides in Vehicular Emissions and Its Fieldwork on Nanjing No. 3 Bridge of Yangtze River

Abstract: This paper reports the results of experiments (conducted on road surface materials) that may effectively reduce the concentration of nitrogen oxide (associated with vehicular traffic) in the air. The performances of Portland cement concrete and bituminous mixtures as carriers of nano-TiO2 for the removal of NO2 are compared. Portland cement concrete was found to be superior to bituminous materials because of its porous microstructure. In the absence of light, the porous concrete specimen adsorbs more NO2 and also forms a higher concentration field of NO2 around the specimen. Even after a significant surface weight loss per unit of area from abrasion, the photo-catalytic oxidation efficiency of the concrete that carried nano-TiO2 remained stable because the nano-TiO2 particles were fixed in the exterior pores and fissures due to permeation. The nano-TiO2 photo-catalyst composite that was placed on the concrete road of the north toll square was found to efficiently reduce the nitrogen oxide concentration and control the air quality in accordance with the China National Air Quality Standard Grade I.

Pervious Concrete in Severe Exposures

Abstract: Porous pavement, especially portland cement pervious concrete (PCPC), helps control pollution discharge by allowing rainwater to rapidly infiltrate into an open-graded aggregate subbase and into the ground. Hydrocarbons become attached to the large surface area of the PCPC or the aggregate subbase and are reduced by natural attenuation, either through evaporation or biological degradation. PCPC also mechanically filters out larger pieces of metal or biological material for later collection during routine maintenance. Thus, the majority of first-flush pollutants are removed by the pervious concrete system, preventing the pollutants from entering stormwater collectors and being conveyed to local surface waters. By allowing stormwater to naturally percolate into the soil, PCPC can also reduce or eliminate the need for stormwater retention areas and the infrastructure required to convey the water. This article provides a summary of the authors' work in this area that focused on the durability of PCPC subjected to freeze/thaw cycles.

Characterization of the Infiltration Capacity of Porous Concrete Pavements with Low Constant Head Permeability Tests

Abstract: Porous concrete (PC) has been extensively used as a surface layer in permeable pavements. The effectiveness of this material in managing stormwater runoff depends not only on subsurface storage, but on infiltration capacity during rainfall events. A variety of tests have been traditionally used for assessing their infiltration capacity, however, there is still uncertainty about whether these tests produce representative performance results under real conditions. This study aims to propose a methodology based on saturated and unsaturated low constant head (LCH) permeability tests, in order to characterize in detail the infiltration performance of PC materials during storm events and predict their infiltration behavior over time. To this end, three different infiltration tests were performed on PC specimens, both in newly built conditions and after being clogged. These experiments included unsaturated LCH, Laboratorio Caminos Santander (LCS) (one falling head permeameter) and saturated LCH tests. The results achieved were analyzed to describe the infiltration performance of the PC pavements tested. Finally, the correlation between the results obtained from on-site tests and laboratory scale devices was studied, providing the regression equations required to apply the infiltration models developed with easily measurable parameters. Consequently, the outputs of this research showed the suitability of the proposed methodology for assessing the infiltration behavior of PC pavements during storm events.