| Abstrakt: |
Experimental work was carried out in this research to study the feasibility of using crushed clay brick waste as a substitute for natural coarse aggregate in concrete, and investigated the ability to reinforce this concrete with fiber from waste materials as an alternative to the commercial fiber. This alternative fiber was made of cut steel Tie Wire (TW) waste with an aspect ratio of 40, a material chosen for its low cost and ready availability. Three concrete mixes featuring 0, 15 and 25% crushed brick waste as a substitute for coarse aggregate were prepared, along with three further batches of 15% crushed brick as coarse aggregate, which were reinforced with different volume fractions (0.5, 1 and 1.5%) of TW waste fiber to produce high performance concrete. Various properties of these concrete mixes, including the compressive, splitting, tensile, and flexural strengths; dry density; and ultrasonic pulse velocity (UPV) were investigated. The results showed that the addition of crushed clay brick waste aggregate causes some reduction in all the studied properties, but that high strength concrete was nevertheless produced at rates of up to 25% crushed brick aggregate. The inclusion of TW waste fiber significantly enhanced the compressive strength of the concrete with 15% coarse crushed brick aggregate, however, allowing high performance concrete with a compressive strength of up to 83 MPa to be produced. The enhancements in compressive, splitting and flexural strengths were 29%, 42.8%, and 38% respectively for concrete reinforced with 1.5% TW waste fiber. [ABSTRACT FROM AUTHOR] |
