Engineering and Durability Properties of Self-Consolidating Concrete Incorporating Foamed Lightweight Aggregate

摘要

This study investigates the engineering and durability properties of self-consolidating concrete (SCC) specimens that were produced using various types of foamed lightweight aggregate (FLWA). Further, the effects of FLWA on the engineering and durability properties of SCC are assessed on the basis of related international standards. All of the fresh SCC mixtures exhibited exceptional flowability with uniform composition. The use of surface-treated FLWA improved significantly the compressive strength and the dynamic elastic modulus of SCC and reduced the drying shrinkage at later ages. The lowest thermal conductivity of 0.79 W/mK was achieved for SCC incorporating 80% fly ash (FA) and 20% ground blast furnace slag (GBFS) aggregate that produced with a foaming agent concentration of 7%. Furthermore, the electrical resistivity and the ultrasonic pulse velocity values for all of the 28-day specimens exceeded 20 kΩ-cm and 3,660 m/s, respectively, satisfying the minimum requirements of the referenced concrete durability indices. Finally, the 91-day passing charges for all specimens ranged between 1,500 and 566 C, indicating either low or very low chloride permeability.