In this paper the properties of the polymer modified cement mortar are studied of DIDY formwork concrete surface coated layer for protection.

本文主要对模网混凝土聚合物改性水泥砂浆保护层的性能进行研究，着重探讨了与耐久性密切相关的抗裂性能和抗渗性能。

Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.

可以在制造混凝土管道时将环氧和塑胶衬里浇筑在里面，或在安装后用沥青砂浆或煤焦油屠宰混凝土管的表面。