Experimental Evaluation of the Impact of Synthetic and Waste Fibers on the Compressive Strength of Soil Stabilized with Cement

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Document Type : Original Article

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Department of Earthquake and Geotechnical Engineering, Faculty of Civil and Survey Engineering, Graduate University of Advanced Technology, Kerman, Iran

Abstract

In this paper effects of different contents of polypropylene fibers, waste fibers extracted from tire plants, and palm trees waste fibers on the compression and mechanical properties of clayey sand were investigated. Atterberg Limits, standard Proctor and unconfined compressive strength (UCS) tests were conducted to the four series of samples with curing time periods of 7, 14, 28 and 56 days. The results indicated a lower maximum dry density (MDD) with the addition of all three fibers and an increase in it by adding cement. The optimum moisture content (OMC) plummeted by adding tire fibers, but increased with the addition of cement, palm fibers or polypropylene fibers. Palm fibers was an indicative of the greatest impact on MDD for the samples by decrease of 7 percent. UCS test results showed a 26% increase in compressive strength of samples made by 0.5 percent of tire fiber. While for the samples made with palm fibers, UCS increased regularly by increment of 1.5 % fiber to 38%. What is more, in the samples made with polypropylene fibers, UCS increased 36% by adding 1% fiber. So among the three fibers being used in the current research, palm fibers have the greatest impact on UCS, while the most effect in the maximum displacement is for polypropylene fibers.

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