The effects of nanoclay on rheological, mechanical and durability properties of cement composites

Document Type : Research Paper

Authors

1 Islamic Azad University, Fouman & Shaft Branch

2 Associate Professor, Faculty of Engineering, University of Mohaghegh Ardabili

Abstract

Concrete is heterogeneous at all length scales and its microstructure evolves continuously over decades. Through the use of nanoparticles, it is possible to alter the microstructure of cementitious materials from within the first microsecond. This study is aimed to carry out a comprehensive investigation on the effects caused by the addition of nanoclays on properties of cement based composites. Therefore, a replacement of cement by with different percentages of montmorillonite nanoclay (0%, 0.5%, 1%, 1.5%, 2% and 3% by weight of cement) in cement pastes and mortars was planned and The effects of adding nanoclay on hydration process, rheological properties (adhesive properties, water demand and setting time), mechanical properties (compressive strength) and durability properties (water absorption and drying shrinkage) of mixes were investigated. As well, The cement matrix microstructure was examined using scanning electron microscopy. The results indicates that the addition of nanoclays causes positive effects on cement composites properties.

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