Engineering Properties for Planting of Porous Concrete Block Containing Rice Straw Ash Sung Chan-Yong; Kim Young-Ik;
This study was performed to examine engineering properties for planting of porous concrete block containing rice straw ash. Tests for void ratio, compressive and flexural strength, pH by neutralization treatment time and curing method were peformed. As results, the void ratio tends to decrease with increasing rice straw ash content. But, the compressive and flexural strength tends to increase with Increasing rice straw ash content. When the neutralization was treated at the curing age 6 days, the greatest strength was showed. The pH of porous concrete without neutralization treatment in dry and water curing are shown in 10.32 10.55 and 9.419.59, respectively. The pH of porous concrete by neutralization treatment in dry and water curing were shown in 9.7410.10 and 8.139.32, respectively. The porous concrete block size was 23 23 4 cm, and species of planting were Tall fescue, Lespedeza cyrtobotrya and Lespedeza cuneata. At the 6 months after seeding, germination ratio and grown-up length of Tall fescue, Lespedeza cyrtobotrya and Lespedeza cuneata were shown in 90, 60, , and 4050, 90110, 6575 cm, respectively. These porous concrete block containing rice straw ash could be used for planting.