TY - JOUR ID - 20014 TI - Experimental study of the effect of water to cement ratio on mechanical properties and durability of nano-silica concretes with polypropylene fibers JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Rahmani, K. AU - Ghaemian, M. AU - Hosseini, S. A. AD - Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran AD - Department of Civil Engineering, Sharif University of Technology, Tehran, Iran Y1 - 2019 PY - 2019 VL - 26 IS - 5 SP - 2712 EP - 2722 KW - concrete KW - Nano-silica KW - Polypropylene fiber KW - Mechanical properties of concrete KW - ASTM standard DO - 10.24200/sci.2017.5077.1079 N2 - In the present paper, the effect of Nano silica on mechanical properties and durability of concrete containing polypropylene fibers has been investigated. Here, the length and length to diameter ratio of used polypropylene fibers were considered to be fixed and equal to 18 mm and 600 respectively and the cement content was 479 kg/m3. The effect of fibers and Nano silica in four different percentages at 0.1, 0.2, 0.3 and 0.4 percent by volume for fibers and 3 percent for Nano silica in concrete with water to cement ratio of 0.33, 0.36, 0.4, 0.44 and 0.5 have been compared and evaluated. In total, more than 425 cubic and cylindrical specimens were made according to ASTM standards. Finally, samples of polypropylene fiber containing Nano-silica were tested under compressive loads, flexural strength, indirect tensile strength (Brazilian test), abrasion resistance, permeability and porosity and their mechanical properties were evaluated. The test results showed a significant increase in mechanical properties improvement and durability of concrete. Compressive strength, tensile strength, flexural strength and abrasion resistance (of concrete) increased up to 55%, 25%, 49%, and 45% respectively. Also, considerable reduction of hydraulic conductivity coefficient to 50% indicates high durability of these types of concrete. UR - https://scientiairanica.sharif.edu/article_20014.html L1 - https://scientiairanica.sharif.edu/article_20014_3a237baf69fa9767c6cf7669426e2ffc.pdf ER -