Abstract
Here, a new concrete hydrophobic treatment method is developed using SiO2 sol and silane emulsion. The effectiveness of the modification for concrete protection is evaluated through testing water absorption and chloride diffusion. Two types of concrete with different strength grades (C40, C50) are used as the research object. The results show that the water capillary absorption coefficient and chloride ion diffusion coefficient of concrete decrease greatly under the protection of SiO2 sol and silane emulsion. Additionally, the protection effect is better with the increase of SiO2 consumption. Contact angle test results reveal that when the coating amount of SiO2 sol and silane emulsion is 300 g/m2, respectively, the contact angle reaches 150.2°, indicating the concrete (C40) surface reaches the superhydrophobic state. Through scanning electron microscope (SEM) observation, it is found that the hydrophobic effect of the SiO2 sol/silane emulsion is mainly due to the change in the surface morphology of concrete (C40).
Highlights
Concrete is a porous material with a large amount of pores and micro cracks on its surface, allowing water to penetrate into the concrete due to the capillary forces
Angle on Concrete layer, The morphologies of the treatedonconcrete surfaces by hydrophobic prepared in this study, were investigated using scanning electron microscope (SEM) (S3500N, HITACH, Tokyo, Japan)
When a superhydrophobic structure can be constructed on the surface of a C40 concrete, it will be more absorbs water
Summary
Concrete is a porous material with a large amount of pores and micro cracks on its surface, allowing water to penetrate into the concrete due to the capillary forces. If certain measures are not taken, it is inevitable that water will enter the concrete and cause corrosion. Various strategies were used to protect concrete from water penetration [6,7,8]. The impregnating agents (water repellents, hydrophobic agents) such as silane are a kind of very effective material to protect concrete from water penetration [9]. Silane can penetrate into concrete for a certain depth and interact with hydrated cement particles to form a water repellent layer which can repel water without sealing the pores of the concrete [10,11,12]. Impregnating agents have almost the same service life as normal concrete
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