Abstract
The purposes of this study are to develop sewer pipes with cementless mixtures (IBPM) and to use IBPM as material for various types of precast concrete products. The IBPM mixture includes four types of industrial byproducts consisting of fly ash, ground granulated blast-furnace slag, granularity controlled sewage sludge incineration ash and silica fume. Calcium hydroxide and expansive additive are also added as an alkali stimulant and shrinkage reducer, respectively. Strength development of mortal with IBPM with different proportions were evaluated. An actual sized specimen of sewer pipe with IBPM was also produced at a precast concrete plant and hydraulic tests to measure the roughness coefficient of the inside surfaces of the pipe. As a result, it was found that strength development of steam-cured IBPM concrete was adequate for precast concrete produces with compressive strength of 40 N/mm2. Reinforced concrete beam with IBPM concrete made by steam curing demonstrated almost the same load-bearing performance as those with cement concrete. It was also proved that sewer pipe with IBPM concrete had good flow capacity with similar roughness coefficient as vinyl pipe.
