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Thursday, 17 October 2019
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Raw materials & technologies, Applications

Construction chemicals: Improving the chloride resistance of concrete

Monday, 29 September 2014

A work studies the chloride resistance of high-strength concrete incorporating bottom ash aggregates for internal curing.

Bottom ash in high-strength concrete can significantly reduce the amount of chloride diffusion. Source: Gerdes

Bottom ash in high-strength concrete can significantly reduce the amount of chloride diffusion. Source: Gerdes

The chloride diffusion in concrete was evaluated by measuring the diffusion distance through steady-state and rapid-state penetration tests.

Bound chloride was decreased when bottom ash was applied

The acid-soluble and water-soluble chloride contents in concrete were measured to evaluate the total and bound chloride concentrations in concrete. To detect the crystalline phase of hydration products that can bind chloride, a thermal analysis and an X-ray diffraction (XRD) analysis were carried out. In addition, the path of chloride penetration in concrete was analysed by using an electron probe microanalyzer (EPMA). The results showed that, although there was no significant effect on the diffusion length, bottom ash in high-strength concrete can significantly reduce the amount of chloride diffusion.

The study is published in: Construction and Building Materials, Volume 71, 30 November 2014, Pages 334-343.

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