Feasibility Study of Pervious Concrete Paver Blocks Containing Natural and Recycle Aggregates

Abstract

A sustainable concrete construction is one that has a low social effect during its full life cycle. Sustainable concrete should use less natural energy, cause little environmental damage, be made from some of the world’s most abundant resources, and can also comprise of recycled components. Recycling of building and demolition waste has become a concern as the construction industry strives towards sustainability. The soil is being changed into a concrete island as a result of construction activity. In locations with excessive rainfall, it poses a serious long-term problem of flooding. Pervious Concrete is a form of concrete with a larger void ratio, made from cement, water, coarse aggregate, and a small amount of fine aggregate (sand). Pervious Concrete produces a porous medium, allowing water to reach the soil below. To assess the properties of pervious concrete, such as compressive strength, void ratio, and density, an attempt was made to develop pervious concrete by replacing natural aggregate with recycled aggregate. Pervious concrete mix design was designed utilizing 375 kg/m3 cement, w/c of 0.4, a/c of 3.97:1, sand in a range of 0 percent to 35 percent, and variable amounts of fly ash and silica fume as mineral admixtures. The results of the tests showed that increasing the amount of natural or recycled fine aggregate (sand) in pervious concrete improves compressive strength and density while lowering the void ratio. The addition of fly ash raised the compressive strength of Pervious concrete up to 20 to 30%, however an excessive amount of fine aggregate combined with silica fume lowered the compressive strength of pervious concrete. It has been established that recycled aggregate pervious concrete has a lower compressive strength and a higher void ratio than natural aggregate pervious concrete. Fly ash and styrene butadiene rubber latex (SBR) were used as mineral and chemical admixtures respectively to increase the compressive strength. There was a significant increase in compressive strength when SBR was used up to 10% of dosage. Two mix designs were developed for the casting and testing of pervious concrete paver blocks containing natural and recycled coarse aggregates. Fly ash and SBR Latex dosage were kept 10% and fine aggregate content was taken 10%. M35 and M30 grade of zigzag shaped paver blocks were developed for pervious concrete with natural and recycled aggregate respectively. Pervious concrete paver block stretch of dimension of 80cm x 80cm was constructed with 60mm thick zigzag shaped paver blocks with sub-base, base and bedding layer of 50cm depth. Properties such as infiltration rate, water storage capacity ,pH and TDS were determined, where pH and TDS of water shown improvement.