Akademik Veri Yönetim Sistemi
9th International Technical Conference on Frontiers of Hydraulic and Civil Engineering Technology, HCET 2024, Sanya, Çin, 25 - 27 Eylül 2024, cilt.62, sa.1, ss.540-546, (Tam Metin Bildiri)
Engineered Cementitious Composites (ECC) are designed by optimizing the matrix, fiber and interface properties according to micro-mechanical steady state cracking theory. Matrix-fiber compatibility in terms of rheology is a prerequisite for homogeneous fiber distribution. Viscosity enhancing admixtures (VEAs) are frequently preferred in ECC design for an optimized matrix phase viscosity to provide effective fiber distribution. Poly-ethylene (PE) and Poly-vinyl alcohol (PVA) fibers are traditionally preferred in ECC design. In recent years, researchers focused on a cost effective alternative as high-tenacity poly-propylene (HTPP) fiber. This paper reports the effects of a VEA on the tensile and compressive properties of HTPP-ECC at two different dosages (0.5% and 1% by wt. of cement). The V-funnel speed of matrix phases and spread-flow diameters of composites are compared with reference HTPP-ECC without VEA. The addition of VEA, lengthened the V-funnel discharge time of matrix phases. Tensile test results demonstrated a ductility improvement of HTPP-ECC by the increment in VEA dosage up to 0.5% without any significant tensile strength loss. However, the tight multiple cracking ability is diminished by VEA addition. Ductility increment is attributed to the enlargement of the crack widths by the slippage of HTPP fibers in the presence of VMA.