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Experimental study of the effect of water to cement ratio on mechanical and durability properties of Nano-silica concretes with Polypropylene fibers

Rahmani, K ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2017.5077.1079
  3. Publisher: Sharif University of Technology , 2019
  4. Abstract:
  5. 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 for each one 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. © 2019 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. ASTM standard ; Concrete ; Mechanical Properties of Concrete ; Nano-silica ; Polypropylene fiber ; Abrasion ; ASTM standards ; Bending strength ; Cements ; Compressive strength ; Concretes ; Erosion ; Fibers ; Mechanical permeability ; Plastic products ; Polypropylenes ; Silica ; Tensile strength ; Wear resistance ; Hydraulic conductivity coefficients ; Indirect tensile strength ; Mechanical and durability properties ; Nano Silica ; Permeability and porosities ; Properties of concretes ; Water to cement (binder) ratios ; Durability ; Cement (construction material) ; Experimental study ; Flexure ; Hydraulic conductivity ; Polymer
  8. Source: Scientia Iranica ; Volume 26, Issue 5 A , 2019 , Pages 1-18 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_20014.html