题目内容

The roof of the residential building was constructed in August. The waterproof coiled material was paved during the day. It was found that the waterproof coiled material was bulging and leaking during the acceptance after the construction. Explain the causes of the above engineering problems.

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The durability of concrete is the comprehensive performance of its resistance to various adverse factors in the working environment, including water penetration, freeze-thaw, carbonization, erosion and so on. Please list the specific measures to improve the durability of concrete.

The stone masonry pool has leakage due to the mortar joint. The leakage problem is solved after the cement-based waterproof coating is applied as a whole. However, when the same waterproof coating is used to waterproof the basement due to foundation cracking, the leakage problem has not been solved. Please explain the reasons for the above problems.

Please explain the corrosion mechanism of sulfate on cement stone, why adding an appropriate amount of gypsum in the production of cement will not have a corrosive effect on cement stone.

新拌水泥混凝土和新拌水泥砂浆的和易性要求有何不同。

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