Investigation of chloride ingress in cracked concrete treated with water repellent agents

Jian-Guo Dai, Y. Akira, E. Kato, H. Yokota

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review


In this paper, results of a test are presented in which reinforced concrete (RC) prisms treated with different water repellent agents have been exposed to cyclic seawater shower for one year. Purpose of the test was to investigate how the water repellent treatment influences the water absorption and chloride ingress into reinforced concrete with and without the existence of cracks. Uncracked RC prisms, some cracked before the water repellent treatment, and some cracked after the water repellent treatment were prepared for comparison. Four types of water repellent agents, ie, liquid silane, liquid silane/oligomeric siloxane, silane-based cream and silane-based gel were applied to treat the concrete surface. Time-dependent water absorption of all the un-cracked and cracked RC prisms was monitored. After one-year exposure, all the specimens were broken open. The penetration depths of water repellent agents in the treated specimens were measured and corrosion areas of the inner steel reinforcement were quantitatively evaluated. The chloride ingress profiles in the cracked and un-cracked RC prisms were evaluated using electron probe microscopy analysis (EPMA). Based on the test results, effectiveness of water repellent treatment as a water and chloride barrier of cracked concrete under marine environment is discussed.
Original languageEnglish
Publication statusPublished - 2008
Externally publishedYes
Event5th International Conference on Water Repellent Treatment of Building Materials - Royal Institute for Cultural Heritage (KIK-IRPA), Brussels, Belgium
Duration: 14 Apr 200815 Apr 2008


Conference5th International Conference on Water Repellent Treatment of Building Materials
Abbreviated titleHydrophobe V
Internet address

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