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Carbonation of waterproof concrete

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Document pages: 8 pages

Abstract: Water repellent treatment is considered to be an effective method to prevent water and corrosive ions from penetrating into concrete, so it can improve the durability of concrete structures. In fact, many concrete structures are exposed to conditions with a high risk of carbonation. In this contribution, a common concrete was prepared, using 400 g m2 silane cream, 100 g m2 and 400 g m2 silane gel. In addition, integral waterproofing concrete was prepared by adding 2 silane emulsion. The specimens were then exposed to accelerated carbonization for 7, 28 and 72 days. The effect of waterproof treatment on concrete carbonation is studied. The results show that surface impregnation reduces the carbonation depth of concreteete under RH 70 , but integral water repellent concrete increased carbonation. Carbonation reaction started behind the hydrophobic layer in the surface-impregnated concrete. The coefficient of carbonation can be described better by a hyperbolic function of time. Treatment by 400 g m2 silane gel and silane cream showed better efficiency on reducing carbonation than usage of 100 g m2. Coefficient of water capillary suction was decreased significantly by both surface impregnation and integral water repellent treatment. It is an effective method to protect concrete from water penetration into the material.

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