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.

Selection of Additives and Fibers for Improving the Mechanical and Safety Properties of Porous Concrete Pavements through Multi-Criteria Decision-Making Analysis

Abstract: Despite the number of environmental advantages that porous concrete (PC) pavements can provide, they are mainly used in light-traffic roads, parking lots and sidewalks due to their low mechanical strength. This research focuses on the common additives employed in PC pavements, according to a literature review, with the aim of increasing their mechanical strength while maintaining an acceptable infiltration capacity. The results demonstrated that the combination of superplasticizers and air-entraining additives can provide indirect tensile strength values over 2.50 MPa, with an infiltration capacity over 0.40 cm/s. In addition, polypropylene fibers were seen to provide very good safety properties, preserving some structural integrity in the case of failure. All mixtures studied obtained outstanding skid resistance results under both dry and wet conditions.

Hydraulic Characterization and Design of Permeable Interlocking Concrete Pavement

Abstract: The environmental benefits of permeable pavements are vast and include stormwater quality reduction, stormwater quality improvement, urban heat island mitigation, and groundwater recharge, among others. Permeable Interlocking concrete pavements explicitly infiltrate water, a new concept to engineering practice for pavements. This technology as a load-carrying surface has not yet been fully characterized nor has the decades of design and performance experience of conventional pavements. This research project developed a hydraulic design methodology for permeable interlocking concrete pavements. Test sections were evaluated in a layered hydraulic flume to determine allowable contributing run-off area for a variety of site geometries and design storms, to determine capture discharge, infiltration rates, and by-pass flow rates for various block spacing, patterns, and across a broad range of pavement cross slopes. The results demonstrate that the capture discharge and infiltration rates are inversely related to the cross slope of the pavement. Results also indicated the infiltration rate of the interlocking permeable pavement blocks exposed to horizontal sheet flow is significantly lower measured vertical infiltration rate which is currently used in filed verification. Additional research included permeable concrete pavement as an alternative sub-base and clogging tests which included the creation of synthetic stormwater for Permeable Interlocking Concrete Pavement (PICP) was completed and analyzed.

Investigation on the functional and mechanical performance of differentially compacted pervious concrete for road pavements

Abstract: Pervious concrete aims at being a sustainable and eco-efficient paving material. A lot of studies have indeed been conducted on pervious concrete pavements (PCP) during the last decade but technical standards and rigorous construction specifications are still missing. The present study tested several laboratory-made pervious concrete specimens to define the proper compaction energy able for achieving specific design requirements in terms of porosity (void content) and bulk density; this to therefore guarantee adequate mechanical and functional performances. Different mixes, prepared by combining several water/cement ratios, were compacted using diverse energies and afterwards tested evaluating the void content, the bulk density, the indirect tensile strength, the compressive strength, the elastic modulus, and the permeability coefficient. Outcomes identified the optimal ranges of void contents and bulk densities for each mixture complying to specific permeability and mechanical requirements such as for allowing a wider adoption of PCP on roadways, even if subjected to mid/high traffic levels.

The Frost-resisting Durability of High Strength Self-Compacting Pervious Concrete in Deicing Salt Environment

Abstract: A high strength self-compacting pervious concrete (SCPC) with top-bottom interconnected pores was prepared in this paper. The frost-resisting durability of such SCPC in different deicing salt concentrations (0%, 3%, 5%, 10%, and 20%) was investigated. The mass-loss rate, relative dynamic modulus of elasticity, compressive strength, flexural strength and hydraulic conductivity of SCPC after 300 freeze-thaw cycles were measured to evaluate the frost-resisting durability. In addition, the microstructures of SCPC near the top-bottom interconnected pores after 300 freeze-thaw cycles were observed by SEM. The results show that the high strength SCPC possesses much better frost-resisting durability than traditional pervious concrete (TPC) after 300 freeze-thaw cycles, which can be used in heavy loading roads. The most serious freeze-thaw damage emerges in the SCPC immersed in the 3% of NaCl solution, while there is no obvious damage in 20% of NaCl solution. Furthermore, it can be deduced that the high strength SCPC can be used for 100 years in a cold environment.