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چکیده
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In the current research, a series of unconfined compressive strength tests were carried out to examine the effect of fiber reinforcement on the strength and ductility characteristics of cemented sand. In this regard, poorly graded sand from Babolsar city was cemented using two percent (dry wt.) cement (type I-525) and also was reinforced by two types of fiber, including Polypropylene and Polyvinyl Alcohol with three different fiber ratios (0, 0.5 and 1 percent) which was randomly distributed throughout the cemented sand. Afterwards, the reinforced and cemented sand was compacted into cylindrical specimens. All specimens were compacted by 50 percent relative density and were cured for three days in a humid room. The results of unconfined compressive strength tests revealed that adding both types of fibers could increase the unconfined compressive strength and its growth rate. Generally, using polypropylene fiber caused more strength increase in comparison with polyvinyl alcohol fiber. Furthermore, by increasing the fiber content in specimens, axial strain increased which polypropylene fiber had a more effective influence on axial strain compared with polyvinyl alcohol fiber.
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