Abstract
Through penetration depth tests, capillary water absorption tests under different abrasion depths, and capillary water absorption tests of a cement mortar test block with crack damage, a self-prepared, novel, graphene oxide/silane composite emulsion used for the effect of wear or cracking damage was studied. The waterproof performance of concrete and the protective mechanism of a composite emulsion was verified by scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis. The test results showed that the penetration depth of the composite emulsion reached depths greater than 9 mm, which yielded a good waterproof effect; when the concrete was cracked or worn, the composite emulsion still had a stable waterproof performance. It was found that the composite emulsion could form a hydrophobic layer with a certain thickness inside the cement-based material, which explains why the composite emulsion had a good waterproof effect.
Highlights
Concrete is the most widely used building material in modern society
The laboratory temperature was 20 ± 2 ◦C and the humidity was more than 50%, with a size of 40 mm × 40 mm × 160 mm, which was used for observation of the micro morphology of cement paste (SEM), and X-ray diffraction (XRD) and comprehensive thermal analysis (TGA) tests
Penetration depth is a basic index to test the waterproof performance of materials
Summary
Concrete is the most widely used building material in modern society. Research on the durability of concrete has attracted the attention of various researchers [1,2,3]. This article continues the previous research to test the waterproof effect of self-developed silane emulsions and composite waterproofing materials on damaged cement-based materials and provides experimental data support for subsequent repairs of actual engineering concrete after damage. The preparation of the cement mortar test block was based on “Mortar, Concrete Waterproofing Agent” [31], cured under water conditions (temperature was 20 ± 2 ◦C). The cement paste test block was prepared in accordance with “Mortar and Concrete Waterproofing Agent” [31], cured under water conditions (temperature was 20 ± 2 ◦C). The preparation methods and related raw materials of graphene oxide (GO)/silane composite waterproof materials have been studied by our group. GO dispersion was utilized to replace distilled water and prepare the GO/silane composite emulsion according to the preparation method for silane emulsion [29]
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