Investigating the Freezing Strength and Durability of Lightweight Concrete With Different Weight Ratios of Nano Montmorillonite and Microsilica

Document Type : Research Article

Authors

1 Assistant Professor, Department of Civil Engineering, Firoozabad Branch, Meymand center, Islamic Azad University, Meymand, Iran

2 Department of Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

3 Instructor, Department Of Architecture And Urban Planning, Technical And Vocational University (TVU), Tehran, Iran

4 Instructor, Department Of Civil Engineering, Technical And Vocational University (TVU), Tehran, Iran

Abstract

One of the effective ways to reduce the specific weight of concrete is to use mineral pumice instead of aggregate, which can reduce the specific weight of concrete. However, due to the high porosity of mineral pumice, the strength and durability of concrete decrease and increase its permeability. While some of the disadvantages of concrete can be specially corrected by using nanomaterials. Nano montmorillonite quickly swells and increases its volume by absorbing water. This property increases density in lightweight concrete. In this research, to make lightweight concrete from mineral pumice, and to increase its density, nano montmorillonite was used in different weight ratios of 0.5%, 1%, 1.5%, 2%, and 2.5% cement. Also, to increase the quality and reduce the cost of consumable materials, micro silica was used in the amount of 10% by weight of the grade of cement used in concrete. The conducted tests include compressive strength, tensile strength, water absorption in hardened concrete, durability against the freezing cycle, economic index, and examination of concrete microstructure. The results of this research showed that the use of 2.5% nano montmorillonite instead of cement along with 10% micro silica in lightweight concrete can increase the 90-day compressive strength by 65% compared to the control sample. But due to the high cost of preparing nanomaterials, the optimal amount of using nano montmorillonite in lightweight concrete was determined to be 1.5% maximum. Because adding amounts more than that has no noticeable effect on increasing the compressive and tensile strength of concrete and the failure of concrete mainly occurs in the light-grained area.

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 11
February 2024
Pages 2263-2284

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