Chloride penetration and sulfate resistance of concrete incorporating nano-silica (nano-SiO2), micro-silica (micro-SiO2) and fly ash

RANJITH, DISSANAYAKE and THUSHARA, PRIYADARSHANA (2016) Chloride penetration and sulfate resistance of concrete incorporating nano-silica (nano-SiO2), micro-silica (micro-SiO2) and fly ash. In: Fourth International Conference On Advances in Civil, Structural and Mechanical Engineering -ACSM 2016, 07-08 May 2016, Bangkok, Thailand.

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Abstract

In this study, effects of nano-silica (nano-SiO2), micro-silica (micro-SiO2) and fly ash on chloride penetration, sulfate resistance and water permeability were investigated based on the results of electrical indication of concrete’s ability to resist chloride iron penetration test (ASTM standard C1202-10) and length change of hydraulic cement mortars exposed to a sulfate solution test (ASTM standard, C1012-02). The addition of nano-silica (nano-SiO2), micro-silica (micro-SiO2) and fly ash in concrete causes a remarkable reduction in chloride iron permeability. These effects may be due to primarily to microstructural changes both in the cement paste phase and in the interracial zone around aggregates. In concrete with nano-silica (nano-SiO2) and micro-silica (micro-SiO2), Nano-SiO2 can behave as nucleus tightly bond with cement hydrates. A stable gel structures can be formed and the mechanical properties of hardened cement paste can be improved when a smaller amount of these materials are added.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: nano-silica, micro-silica, durability of concrete, chloride penetration, sulfate resistance
Depositing User: Mr. John Steve
Date Deposited: 23 Mar 2019 12:11
Last Modified: 23 Mar 2019 12:11
URI: http://publications.theired.org/id/eprint/849

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