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.

Laboratory Evaluation of Sound Absorption Characteristics of Pervious Concrete Pavement Materials

Abstract: This paper describes a laboratory study on the sound absorption characteristics of clogged and unclogged pervious concrete (PC) pavement materials compared with those of porous asphalt (PA) mixtures and those of conventional dense-graded asphalt and portland cement concrete pavement materials. Examined in this study were the effects of the mixtures’ initial porosity on their sound absorption characteristics and how these characteristics were affected by subsequent clogging of the mixtures. Four porosity levels of PC and PA were studied: 10%, 15%, 20%, and 25%. The mixtures with 20% porosity were tested for the effects of clogging. The test results showed that the shapes of sound absorption spectra of PC and PA materials were similar displayed high sound absorption values within the frequency range of 250 to 1,000 Hz. However, for all four porosity levels studied, the PC materials produced about 0.1 or 20% higher sound absorption coefficient values throughout the entire measured frequency range from 100 to...

Colorful water permeable concrete pavement and construction technique

Abstract: The invention relates to a chromatic pervious concrete pavement material and a construction process thereof, which is characterized in that the formulation of a special concrete binding agent comprises 85 to 92 percents of cement (weight), 5 to 10 percents of silicon ash, and rubber powder, early strength admixture, water reducing agent and paint. The ash collection ratio is 4.0 to 6.0; the water cement ratio is 0.30 to 0.40; dry power shaped binding agent, aggregate and water are added in a concrete agitator according to the blending ratio so as to be churned into a mixture with uniform and proper dryness and humidity, which is then is used for paving and construction after being flattened; a low frequency flat oscillator is used for vibrating, compacting and leveling on the surface; the water is poured for maintenance; oily crylic acid resin is taken as mat coat agent to ensure that the color of the pavement is fresh. The chromatic pervious concrete pavement material and the construction process thereof have the advantages that steel-making industrial waste residue is adopted as the aggregate to change waste into valuables; the problem of low strength of the non-sand water permeability concrete material with a plurality of holes is solved by lower cost; compared with the high molecule permeable material, the cost is low, the strength is high, and the ageing resistance is good; compared with the sintering ceramics permeable material, the cost is low, the energy consumption is reduced, and the permeability effect is strong.

The impact of recycled coarse aggregates obtained from waste concretes on lightweight pervious concrete properties

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.

Optimization of Steel Fiber Used for Induction Heating in Porous Asphalt Concrete

Abstract: An electrically conductive porous asphalt concrete used for induction heating and subsequently healing of cracks is prepared by adding conductive materials (steel fibers and steel wool) in this research. In this paper, the optimization of steel fiber used for induction heating is reported based on the electrical resistivity, induction heating speed and particle loss resistance of porous asphalt concrete. It is found that porous asphalt concrete containing steel fiber with smaller diameter or longer steel fiber is more electrically conductive and induction heatable than that containing the same content of steel fiber with bigger diameter or short steel fiber. It is also found that steel wool type 00 with length of 9.5 mm is more effective than short steel fiber type 1 and steel wool type 000 to improve the particle resistance of porous asphalt concrete. Finally, 8% (by volume of bitumen) of steel wool type 00 is considered as the best option used for induction heating in porous asphalt concrete.

Effect of pore structure on fatigue of pervious concrete

Abstract: Pervious concrete (PC) is a class of porous pavement whose properties are largely influenced by pore parameters. Under repeated vehicular loads, PC undergoes reduction in stiffness leading to failu...