| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
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| Research Abstract |
Authors have been studying for about ten years as for the effective utilization of sludge water produced in ready mixed concrete plants due to washing of a mixer, agitating truck dram etc. Nowadays, JIS A 5308 permits the usage under 3 percent as solids of sludge for the unit cement content of new concrete. Recently, it is strongly requested to re-use a further large quantity of sludge water, in order to achieve the zero-emission. It is expected to re-use sludge water for concrete from the fact that sludge water consists of cement, fine particles of aggregate and water. All materials are one of the constituents of concrete.
This study, in order to utilize the larger quantity of sludge water than that now allowed, is to verify the properties of lean mixture concrete, Air-Entraining and High Range Water-Reducing Admixture concrete and AE concrete containing sludge which was designed for having the identical slump and compressive strength to comparative concrete. From the results of this study, it became clear that as for the every concretes containing stabilized sludge within the range of 3-15%, there was no problem about slump, bleeding, compressive strength, drying shrinkage and carbonation depth. In other words, within the range of 15% of sludge solid content, any concrete containing sludge water with setting retarder could obtain good performance as same as comparative concrete. It was also confirmed that the bulk volume of coarse aggregate was available for the design method of any concrete mixture.
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