Journal Paper

Paper Information

Journal: تحقیقات بتن
Year:1394 | Volume:8 | Issue:2
Start Page:19 | End Page:34

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Title

MECHANICAL AND DURABILITY PROPERTIES OF SELF COMPACTING CONCRETE CONTAINING NANO SILICA PARTICLES CONSIDERING OPTIMUM PERCENTAGES OF FIBERS

Pages

 Start Page 19 | End Page 34

Abstract

 Recent researches have shown that use FIBER in concrete can increase the flexural, tensile, and abrasion resistance. On the other hand Self-Compacting Concrete is a high flowable homogenous concrete which can eliminate several common problems in normal concretes by means of its compaction under its own weight. The above properties of SELF COMPACTING CONCRETE facilitate the fabrication of concrete structural members with congested reinforcement.On the other hand, in the past two decades application of nano-technology has significantly revolutionized human knowledge. Using NANO SILICA PARTICLES as a product of pozolanic reaction, can strongly improve the permeability of concrete. Thus concrete having the properties of both SELF COMPACTING CONCRETE and FIBER reinforced concrete with strengthened micro matrices can improve the fabrication of durable structures with high performance level. In this research, the combined effect of nano-silica particles and FIBERs type (steel, polypropylene and glass) on MECHANICAL PROPERTIES (compressive, tensile and flexural strength, modulus of elasticity), rheological behavior (L-box, slump flow and T50) and also the DURABILITY of Self-Compacting concrete were evaluated using water absorption and Rapid Chloride Penetration Test (RCPT). Furthermore, XRD test has been used.For this purpose, forty mixtures in A, B, C and D series representing 0, 2, 4 and 6 percent of NANO SILICA PARTICLES replacing cement content were cast. Each series involved three different FIBER type and content.0.2, 0.3 and 0.5% volume for steel FIBER, 0.1, 0.15 and 0.2% of volume for polypropylene FIBER and finally 0.15, 0.2 and 0.3% of volume for glass FIBER. The results show that the combined usage of optimum percent of FIBER and NANO SILICA PARTICLES will improve the MECHANICAL PROPERTIES and DURABILITY of self-compacting concrete.

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