5. Conclusions
The use of RA, DA, and PA as coarse aggregates in pervious concrete
reduced the density and thermal conductivity compared with
that of pervious concrete containing natural aggregate (approximate
3–4 times). The densities of all LWPCs ranged from 558 to
775 kg/m3 with the 28 days compressive strengths varied between
2.47 and 5.99 MPa and could be used for application in insulating
material. The thermal conductivity coefficients of LWPCs were
0.16 and 0.25 W/m K which were slightly higher than that of autoclaved aerated concrete and similar to low density LWCs. The
increase in cement paste content decreased total void ratio and
water permeability, while mechanical properties and density were
increased. The increasing of cement paste content from 15% to 20%
could rapidly reduce water permeability. LWPC containing DA
exhibited a higher quality of mechanical properties and a lower
thermal conductivity than those of RA and PA. However, LWPC
containing PA showed the highest water permeability.