Using sludge ceramic to prepare LC40 lightweight aggregate concrete

Researched the mix proportion of using self-made high-performance sludge ceramic to prepare LC40 LWAC. Studied the effect of ceramic-size, supplementary cementitious materials, water-cement ratio and sand-ratio on the LWAC performance. The study shows, size of ceramic too large can cause strength decrease, poor stability and workability; supplementary cementations materials make strength and workability of LWAC improve, but excessive addition could reduce concrete strength particularly in the early stage, so there is a reasonable dosage; LWAC strength is increased with the decrease of water-cement ratio, but for the limit of strength of LWA, the increase of strength is not obvious when water-cement ratio reduced to a certain extent; increasing sand-ratio can improve concrete strength, but have adverse impact on the workability of fresh concrete. Using the study results, optimized the concrete mix proportion and prepared LC40 LWAC with density level 1700, slump degree over 18cm, extended degree over 50cm.