The effects of nano silica and steel fibers on mechanical properties of roller-compacted concrete pavement

Document Type : Research Paper

Authors

1 civil engineering department, engineerig faculty, mohaghegh ardabili university, ardabil, iran.

2 civil engineering department,engineering faculty,mohaghegh ardabili university,ardabil,iran.

Abstract

Roller Compacted Concrete is defined as a concrete with zero slump. It will support a roller while being compacted in its unhardened state. RCC is used in two general areas of engineered constructions: dams and pavements. In this study, RCC will be discussed only in the context of its use in pavements. In this regard, Some material savings may be possible due to the lower cement content normally needed in RCC pavement mixtures to achieve strengths equivalent to those of conventional concretes. The other advantages of using RCC include cost savings as a result of the construction method and the increased placement speed of the pavement.
Unreinforced concrete has a low tensile strength and a low strain capacity at fracture. It was reported in many studies that NS significantly improved the mechanical properties and durability of cement-based materials. In this study we carried out a comprehensive investigation of the results caused by the addition of steel fibers and nano silica particles in mechanical properties of RCCP. Therefore, with varying amounts of steel fibers (0.00%, 0.33%, 0.67% and 1.00% by the volume of concrete) and nano silica particles (0.0%, 0.5%, 1.0% and 1.5% by the weight of cement), RCCP was prepared and consistency and mechanical properties (compression strength, tension strength, flexural strength, and thoughness) were investigated. The results indicated that the addition of steel fibers and nano silica leads to positive mechanical properties of RCCP.

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