Impermeability Research of Autoclaved Propylene Oxide Sludge Shell-aggregate Concrete

Abstract

We aimed to reuse the propylene oxide sludge (POS). Propylene oxide sludge shell-aggregate (POSS-A) and propylene oxide sludge gradient shell-aggregate (POSGS-A) whose main hydrated phase is tobermorite were successfully manufactured by the hydrothermal synthesis of POS and silica materials under the condition of autoclaved (180 °C, 1.0 MPa) curing. Influences of pre-wetting time of coarse aggregate and pressure application mode on the different concretes were investigated. The experimental results show that the concrete with POSS-A as coarse aggregate (POSS-A concrete), the concrete with POS gradient shell-aggregate as coarse aggregate (POSGS-A concrete), sintered aggregate concrete and common concrete, all have excellent impermeability performance whatever the pre-wetting time of coarse aggregate is 0.5 h or 24 h, and the pre-wetting time of coarse aggregate has a negligible influence on the concrete. The influence degree of pressure application mode on the impermeability performance of the sintered aggregate concrete is the greatest among three kinds of concrete, which has a negligible influence on impermeability performance of the other concretes. POSGS-A can be used as a green building light aggregate in hydraulic concrete.

Keywords

propylene oxide sludge / hydrothermal synthesis / autoclaved aggregate / impermeability / concrete