Using of sediment from foundation engineering to produce recycling cold-bonding coarse aggregates

In Taiwan, construction residual soils are generally sorted into 9 categories. The sediment from foundation engineering is classified as B6 construction residual soil which is a kind of recycling resource. Based on the purposes of resources recycling, this study employs the cold-bonding technique, which incorporates the principles of the cement chemistry and composite material to develop the recycling coarse aggregates using the sediment from foundation engineering as the matrix. The improvements of reusing rate and value of sediment from foundation engineering are expected. The results show that the specific gravity of recycling coarse aggregate is about 1.83 in the oven-dry (OD) state and 2.12 in the saturated-surface-dry (SSD) state; the absorption capacity is approximative 15.5%; the dry loose density (i.e. unit weight) is around 1215 kg · m^-3; the particle cylindrical crushing strength ranges from 12 to 18 MPa. For this reason, the developed recycling cold-bonding coarse aggregate presented in this paper could increase the reusing and recycling of construction wastes, reduce the energy consumption and CO₂ emission resulted from producing the sintering recycling aggregates, and diminish the impact on the environment and future generations.