Usage of recycled aggregate decrease the dry density of pervious
concrete and a defined decrease in dry density was observed when the natural
aggregate replaced with the recycled aggregate at determined levels.

Replacing the recycled aggregate with natural aggregate resulted in
increment of void content. The compressive strength values of pervious concrete
were also affected by w/c ratio as well as recycled aggregate content.

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The compressive strength results obtained from this study were in
the allowable range which is given for the pervious concretes. The recycled
aggregate is composed of weak cement matrix and interfacial transition zone among
gravels. This creates weak cement paste which causes compressive strength to
decrease.

Splitting tensile strength values of pervious concrete ranging
between 1.00 and 1.29 MPa was achieved. When the w/c ratio and recycled
aggregate content were increased, the splitting tensile strength of pervious
concrete decreased.

The permeability characteristic of pervious concrete was also
significantly affected by w/c and recycled aggregate content. The pervious
concrete produced with lower a/c ratio performed low permeability characteristic.
The high amount of cement in lower a/c ratio filled the voids between aggregate
particles and this situation caused a lower permeability; however, permeability
coefficient values obtained from the experimental study showed that all
pervious concrete mixtures had high permeability. The abrasion results, by deep
of wear, indicated that utilization of recycled aggregate decreases the abrasion
resistance; 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 density
and thermal conductivity about 3–4 times compared with pervious concrete
containing natural aggregate. The densities were 558–775 kg/m3 which were lower
than 800 kg/m3 and suited for use as insulating concrete. The 28-day
compressive strengths of LWPCs ranged from 2.47 to 5.99 MPa. The increase in
cement paste content improved the mechanical properties of LWPCs.

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