耐碱玻璃纤维混凝土的高温劈裂抗拉性能

Splitting tensile properties of alkali resistant glass fiber reinforced concrete after high temperature

采用在自然冷却及浇水冷却后加载的方式,探索耐碱玻璃纤维混凝土高温后劈裂抗拉性能,观察混凝土宏观现象,结合试验数据探讨纤维混凝土高温后劈裂抗拉性能变化规律。结果表明:耐碱玻璃纤维的掺入对高温后混凝土的劈裂抗拉性能有明显的改善作用;耐碱玻璃纤维在400℃浇水冷却后,表面涂层重新凝聚,使得耐碱玻璃纤维与混凝土间保持了良好的粘结力;浇水冷却后,不论是基准混凝土还是耐碱玻璃纤维混凝土,劈裂抗拉强度均低于自然冷却后。

Using the method of loading after natural cooling and water cooling, study the splitting tensile properties of alkali re- sistant glass fiber reinforced concrete after high temperature. Observed the concrete macroscopic phenomenon, and combi- ning with the test data, study the change rules of the splitting tensile properties of concrete with fiber after high temperature. Results showed that mixing alkali glass fiber can improve the splitting tensile performance of concrete after high temperature; When the temperature is 400 ℃, after cooling by water, the coating condenses again, and maintains the bond strength be- tween alkali resistant glass fiber and concrete; The splitting tensile strength of reference concrete and concrete with alkali resistant glass are both worse after cooling by water than natu- ral cooling.