Usage of recycled aggregate decrease the dry density of perviousconcrete and a defined decrease in dry density was observed when the naturalaggregate replaced with the recycled aggregate at determined levels.
Replacing the recycled aggregate with natural aggregate resulted inincrement of void content. The compressive strength values of pervious concretewere also affected by w/c ratio as well as recycled aggregate content.The compressive strength results obtained from this study were inthe allowable range which is given for the pervious concretes.
The recycledaggregate is composed of weak cement matrix and interfacial transition zone amonggravels. This creates weak cement paste which causes compressive strength todecrease.Splitting tensile strength values of pervious concrete rangingbetween 1.
00 and 1.29 MPa was achieved. When the w/c ratio and recycledaggregate content were increased, the splitting tensile strength of perviousconcrete decreased.
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The permeability characteristic of pervious concrete was alsosignificantly affected by w/c and recycled aggregate content. The perviousconcrete produced with lower a/c ratio performed low permeability characteristic.The high amount of cement in lower a/c ratio filled the voids between aggregateparticles and this situation caused a lower permeability; however, permeabilitycoefficient values obtained from the experimental study showed that allpervious concrete mixtures had high permeability. The abrasion results, by deepof wear, indicated that utilization of recycled aggregate decreases the abrasionresistance; however, decrease in w/c enhanced the abrasion resistance.Y. Zaetang et al. 2013.
Their results indicated that the use of DA,PA, and RA as coarse aggregates in pervious concrete could reduce the densityand thermal conductivity about 3–4 times compared with pervious concretecontaining natural aggregate. The densities were 558–775 kg/m3 which were lowerthan 800 kg/m3 and suited for use as insulating concrete. The 28-daycompressive strengths of LWPCs ranged from 2.47 to 5.99 MPa.
The increase incement paste content improved the mechanical properties of LWPCs.
