高原环境条件下屋面各结构层温度应变及防水层破坏机理研究

Research on the Temperature Strain of Each Roof Structural Layer and Waterproof Layer Failure Principle Under the Plateau Environment

为了研究高原环境条件下屋面各结构层温度应变变化规律,并探究防水材料破坏原理,设计了两种复合防水材料的试验方案,对屋面模型施加冻融循环、降雨、大风和太阳辐射等因素并进行数据分析得出:水泥砂浆层沿宽向收缩应变是导致防水层失效的主要原因,拟合出屋面模型水泥砂浆层最大收缩应变预测关系式;(速凝橡胶沥青+成型非固化橡胶沥青)复合防水涂料较(非固化橡胶沥青+SBS防水卷材)复合防水涂料更加适用于高原气候环境;水泥砂浆层对防水层应变的改变具有一定影响,钢筋混凝土层对页岩粉煤灰层应变变化有促进或抑制作用。研究成果有助于改进高原环境的屋面结构防水工作。

In order to study the temperature strain variation law of each structural layer of roof modelunder plateau environment and explore the failure principle of waterproof materials,two test schemes of composite waterproof materials were designed to exert affecting factors such as freeze-thaw cycle,rainfall,wind and solar radiation on roof model.Through data analysis,it was concluded that the shrinkage strain of cement mortar layer along the width was the main cause of waterproof layer failure,and the prediction relationship of maximum shrinkage strain of cement mortar layer of roof model was fitted;(quick setting rubber asphalt+molded non curing rubber asphalt) composite waterproof coating was more suitable for plateau climate environment than(non curing rubber asphalt+SBS waterproof coiled material) composite waterproof coating.Cement mortar layer has a certain influence on the strain change of waterproof layer,and reinforced concrete layer could promote or inhibit the strain change of shale fly ash layer.The research results are helpful to improve the waterproof work of roof structure in plateau environment.