Impact strength and shrinkage of sustainable fiber reinforced crushed brick aggregate concrete

Abstract

In the presented work, sustainable High-Performance Lightweight Aggregate Concretes (HPLWACs) containing crushed clay bricks from the demolition and construction wastes as coarse lightweight aggregates (LWA) reinforced with the mono fiber, double, and triple fibers in many aspect ratios (l/d), and types have been created. Six prepared HPLWAC mixes were studied. Generally, the fibers’ inclusions in HPLWAC greate enhancing the ultimate failure and first crack impact resistance compared to plain specimens for hybrid and mono fiber specimens. Impact energy is increased at the failure related to concrete specimens, reinforced with the mono steel fiber was 1283%, 1042 %t, 984, and 892%. In contrast, the increment in single plastic reinforced specimens was 917%, 908%, 766, and 753% at 7, 28, 60, and 90, compared to the plain specimen. The concrete specimens that are reinforced via double hybrid fibers show an insignificant decrease in first crack impact resistance and overall failure compared to the mono steel fiber specimen. Triple hybrid fiber reinforced concrete specimens show the largest number of blows at the ultimate failure and first crack. Concrete specimens reinforced with mono steel and plastic fibers have decreased in drying shrinkage relative to plain concrete specimens. Double-hybrid concrete specimens reinforced have a slight improvement. In comparison, concrete specimens reinforced triple hybrid fiber show a reduction in drying shrinkage than plain concrete specimens.