Mechanical properties of lightweight concrete made with cold bonded fly ash pellets

Abstract

In this paper, compressive and splitting tensile strengths, modulus of elasticity and steel rebar-concrete bond strength of lightweight aggregate concretes (LWAC) produced at 0.40 w/c with sand and mixture of crushed stone and lightweight fly ash coarse aggregates are presented. Lightweight fly ash aggregates (LWA), plain (LC) and reinforced with 0.1% (L1P) and 0.5% (L5P) crumb rubber and0.1% (L1F) polypropylene fiber are utilized. Test results revealed that the compressive strength of all LWAC conformed to the limitation for structural use whereas a reduction in density up to 20% was achieved. Whereas the mechanical properties decreased with the use of lightweight aggregates, some increases were observed for the steel-concrete bond strength.