Abstract
In this paper, the study of the influence of nano-silica (nano-SiO2) on the properties of the interface between CSH gel and cement particles and its effect on nano-mechanical properties of the products at the interface zone was examined. In this paper M50 grade SCC mixes were developed using 5% micro-silica and various percentages of 0.5%, 1.0% and 1.5% nano-SiO2. For 1.0% nano-SiO2 addition to M50 grade SCC mix, the compressive strength is maximum. Similarly concrete quality using non-destructive techniques, water absorbtion capacity and porosity are also assessed.
Highlights
Concrete is a composite material consisting of many phases in micro and macro scale level
The SiO2 content of colloidal nano-SiO2 (CNS) was larger than 99% by weight, and the pH value was 11
The following table presents the compressive strengths of nano-SiO2 self-compacting concrete (SCC) mixes mixed with various dosages of nano-silica
Summary
Concrete is a composite material consisting of many phases in micro and macro scale level. It is strong due to the heterogeneous nature acquired due to (1) interfacial transition zone between aggregate and matrix, (2) interaction between sand and paste matrix and (3) collaboration among CSH gel, large crystals of Ca(OH)[2 ], unhydrated cement particles and pores formed due to high w/c ratio. Fine aggregate and cement paste is understood well with micro observational studies but the phase between the unhydrated cement grains and CSH gel was not been explored effectively especially in concretes with high w/c ratio due to availability of high amount of unhydrated cement particles. To enable a uniform distribution of nano-SiO2 in paste, colloidal nano-SiO2 (CNS) was used instead of nano-SiO2 powder. The SiO2 content of CNS was larger than 99% by weight, and the pH value was 11
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