新型水工混凝土表面防护涂层抗冻融性能研究

摘要

The geographic position of alpine-cold region of west China is unique, the hydrological conditions and climatic conditions are complex and the natural environment there is harsh, therefore the freeze-thaw damage of the concrete materials occurs frequently. Freeze-thaw resistance property tests were conducted for three newly-developed surface protective coating materials of hydraulic concrete, namely the weathering epoxy coating, unsaturated polyester resin and polyurea coating system. The freeze-thaw resistance property of the polyurea coating system, using epoxy mortar as primer, polyurea material as paint, has the best effects under indoor accelerated freeze-thaw tests. And it is proved by the field production test that the material can protect the hydraulic concrete effectively in Tibet region, which is expected to be applied to the surface protection of hydraulic structures for improving the durability of water conservancy and hydropower projects in alpine-cold regions of west China.%西部高寒地区地理位置独特，水文地质气候条件复杂，自然环境恶劣，造成该区域内水利工程混凝土材料易发生冻融劣化破坏。对此，选取课题组已研发的3种新型水工混凝土表面防护涂层材料(耐候型环氧涂层、不饱和聚酯树脂和聚脲涂层体系)，进行室内加速冻融试验。试验结果表明，以环氧胶泥为底漆，聚脲材料为面漆的水工混凝土表面防护涂层的抗冻性能最优。随后在西藏地区水利水电工程进行了现场生产性试验，通过观测发现，新型聚脲材料起到了很好的抗冻防护效果。该材料有望应用于西部高寒地区水工建筑物的表面防护，提高水利水电工程建筑物的耐久性。