Influence of Polypropylene Fibers on The Compressive Strength of Windblown Sand-Cement Mortar
Department of Civil Engineering, University of Hormozgan, Iran
Assistance Professor, Department of Civil Engineering, University of Hormozgan, Iran
This article describes a laboratory study on the compressive strength of windblown sand by stabilizing it with ordinary Portland cement (OPC) and polypropylene fibers (PPF). Along with index property tests, laboratory test used for investigating the using of polypropylene fiber as an additive to increase the compressive strength of windblown sand-cement mixture is Compressive Strength of Hydraulic Cement Mortars (CSCM) test (Using 2-in. or [50-mm] Cube Specimens). Test specimens were prepared with varying admixtures of cement content (5%, 10%, 15% and 20% by weight) and polypropylene fibers (0.05%, 0.10%, 0.20%, 0.40% and 0.80% by weight). Compressive strength tests were carried out after 7 and 28-day curing periods.
The results show that when polypropylene fibres are mixed in windblown sand-cement mortar, they will be evenly distributed in a matrix, relax the stress concentrations around crack tips, prevent crack expansion and enhance windblown sand-cement mortar mechanical properties. Moreover the inclusion of polypropylene fiber reinforcement within windblown sand-cement mortar could increase the compressive strength of cement mortar; however utilizing high content of fiber (beyond 0.2 %) has no positive effect on compressive strength.
Keywords: windblown sand; ordinary Portland cement; polypropylene fibers; compressive strength of cement mortar.
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