Abstract
The behavior of reinforced concrete beams containing fibers made of waste plastic straws (WPSs) under the three point bending test is examined. The effect of WPS fiber addition on the compressive and split tensile strength is reported. Four concrete mixes were prepared. The control mix PS-0 had a proportion of 1 cement: 1 sand: 2 coarse aggregate and a water cement ratio of 0.4. In the other three mixes PS-0.5, PS-1.5 and PS-3, 0%, 0.5%, 1.5% and 3% of WPS fiber (by volume) was added respectively. The results show that at 0.5% WPS, there is slight increase in compressive strength. However, beyond 0.5% addition, a decrease in compressive strength is observed. The split tensile strength shows a systematic increase with the addition of WPS fibers. The reinforced concrete beams containing WPS fibers show higher ductility as demonstrated by the larger ultimate tensile strain and ductility index (Δu/Δy). There is a tendency to have more fine cracks with the presence of WPS fibers.
Highlights
Concrete is an essential material in construction and consumes large amounts of natural resources
The results showed a slight increase in the compressive strength for concrete containing 0.5% waste plastic straws (WPSs) (PS-0.5) compared to the control specimen (PS-0; Figure 11)
The compressive strength showed to be decreased when increasing the percentage of WPS
Summary
Concrete is an essential material in construction and consumes large amounts of natural resources Replacing these resources with recycled or waste product would be advantageous to the economy and the environment. While there is slight reduction in workability in the presence of fibers, an improvement in flexural and split tensile strength is observed. Vikrants et al [12] investigated the effect of adding steel fiber on the performance of concrete. They found that the inclusion of steel fibers in concrete improve the compressive strength, split tensile strenVgtihkraanndtsfeletxaulr. Tofhfeiybeforsu.nd that the inclusion of steel fibers in concrete improve the compressive strength, split tensile strenYgtahkhanladf fl[1e3x]usrtaul dstireedngththe. Fofurtueirneforersceadrcohnwcriellteatbteammpst atondexsalambsinwehthene seuffbejcetcthedisttoydpyenoafmfiibcearns donimthpeacbtelhoavdiso[r24o–f 2r9e]i.nforced concrete beams and slabs when subjected to dynamic and impact loads [24,25,26,27,28,29]
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