What is it about?
A novel approach has been presented to add a dual‐crystalline hydrophobic admixture in fresh concrete for improving hydrophobicity against chloride and harmful chemicals. Dual‐crystalline material can utilize water of the fresh concrete to form crystals, but the challenge is to maintain adequate hydration and strength while improving hydrophobicity.
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Why is it important?
This study presents the results from a comprehensive laboratory investigation on the application of 1, 2 and 8% of crystallizing aqueous and cementitious hydrophobic mineral in fresh concrete. Significant reduction of water absorption was observed indicating greater hydrophobicity. The optimum performance was found in mixtures with 2% admixture. Mixture with 2% aqueous hydrophobic admixture revealed marginal strength gain compared to 2% crystalline cementitious hydrophobic admixture, although water protection appears to be better in cementitious mixture.
Perspectives
Writing this article was a great pleasure as it has co-authors with a very long experience in the field of concrete protection and treatment. I hope you find this article thought-provoking.
Mazen Al-Kheetan
Brunel University
Read the Original
This page is a summary of: Development of hydrophobic concrete by adding dual-crystalline admixture at mixing stage, Structural Concrete, March 2018, Wiley,
DOI: 10.1002/suco.201700254.
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