Development of Hydrophobic Concrete by Adding Dual-Crystalline Admixture at Mixing Stage

Al-Kheetan Mazen, Mujib Rahman, Denis Chamberlain

Research output: Contribution to journalArticlepeer-review


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. 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. Despite the high slump in the fresh mixture, no segregation was observed in the matured concrete. There was a marginal reduction of strength when a high percentage of admixture was used. Despite this, 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.
Original languageEnglish
Pages (from-to)1504-1511
JournalStructural concrete
Issue number5
Early online date23 Mar 2018
Publication statusPublished - 1 Oct 2018

Bibliographical note

© 2018 The Authors. Structural Concrete published by John Wiley & Sons Ltd on behalf of fib . International Federation for Structural Concrete

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.


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