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This work presents the influence of the sand particle size on the cementitious matrix bond for alkali treated jute fibers. The fibers were washed for 3 hours in water at 80 °C, then cooled at 40 °C for 5 hours. This process was applied to remove residues and impurities from the fiber’s surface. After washing and cooling, the fibers were additionally submerged in a saturated solution of calcium hydroxide, Ca(OH)2 for 50 minutes and then were dried for 24 hours at 40 °C. The tensile stress-strain behavior of the fibers was determined at a microforce testing system using the gage length of 20 mm. The cross-sectional area of the fiber was measured using a scanning electron microscope (SEM) micrographs and image analysis. The Young’s modulus, force at rupture, maximum stress and strain were calculated from the collected data to evaluate the influence of alkaline treatment on fiber’s tensile properties. To evaluate the effect of the maximum particle size of the sand on the fiber-matrix bond, pull-out tests were performed for fiber embedment length of 7 mm with three different matrices related to maximum particle sizes of 250, 425 and 710 μm, respectively. The results showed that the matrix with the highest maximum particle size of sand presented higher fibermatrix bond than the other ones.

Influence of the sand particle size on the bond of cement matrix-alkali treated jute fibres