用于预制舱的玻璃纤维混凝土弹性模量与本构关系研究

Elasticity Modulus and Constitutive Relation of Glass Fiber Reinforced Concrete Used in Prefabricated Cabin

为满足标准配送式变电站对二次设备预制舱原材料的性能要求,对硅酸盐水泥基玻璃纤维混凝土和硫铝酸盐基玻璃纤维混凝土的弹性模量和本构关系进行了研究。实验采取两种不同基材GRC材料的9种配合比,考虑水灰比、胶砂比、玻璃纤维掺量等三种对GRC材料性能影响明显的参数,对比了不同配合比下GRC材料的性能表现。实验结果显示,对于硅酸盐水泥GRC材料,提高水灰比会导致其抗压强度降低;而对于硫铝酸盐GRC材料,适当提高水灰比会减少纤维引入的缺陷,一定程度上提高抗压强度。GRC材料弹性模量主要受水灰比的影响,与之呈负相关;GRC材料受弯时,基体强度较高的GRC材料整体强度更高,但破坏速度更快;基体强度较低时整体强度也略有下降,但破坏速度更平缓;硫铝酸盐水泥GRC材料的破坏速度均小于硅酸盐水泥GRC材料。

In order to meet the performance requirements of the materials used by standard distributional substations' secondary equipment prefabricated cabin, the elasticity modulus and constitutive relation of Portland cement based glass fiber reinforced concrete and sulphoaluminate based glass fiber reinforced concrete were studied. In this experiment, nine kinds of mixing ratios of GRC materials with different substrates were designed. Considering the water-cement ratio, the cement-sand ratio and the amount of glass fiber, these three parameters which have obvious influence on the performance of GRC materials were compared. The experimental results show that for Portland cement GRC materials, increasing the water-cement ratio will result in a decrease in compressive strength. For sulphoaluminate GRC materials, appropriately increasing the water-cement ratio will reduce the defects introduced by the fiber and improve the strength to some extent. The elastic modulus of the GRC material is mainly affected by the water-cement ratio and is negatively correlated. When the GRC material is bent, the GRC material with higher matrix strength has higher peak stress, but the destruction speed is faster. When the strength of the matrix is low, the peak stress also decreases slightly, but the destruction speed is more gradual. The sulphoaluminate cement GRC material has a lower failure rate than the Portland cement GRC material.