Steel pipes with inner cement lining slightly cracked or scratched on the edge.

钢管边沿水泥内衬，轻微裂痕、擦痕。

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As for hydraulic tunnel lining concrete, thermal stress is one of important factors that cause concrete cracks, due to the heat of hydration of cement in the construction period.

对于水工隧洞衬砌混凝土，在施工期由于水泥水化热作用，温度应力影响显著，是产生混凝土结构裂缝的重要原因之一。

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Cement mortar lining technology is often resorted to when corrosive water is to be carried.

水泥砂浆衬里技术是一项应用较广的实用技术，一般在输送有一定腐蚀性水质时采用。

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