混杂纤维与矿物掺合料共同作用对砂浆力学性能的影响

Effect of Hybrid Fiber and Mineral Admixture on the Mechanical Properties of Mortar

摘要: 主要研究了掺入混杂玻璃纤维和聚丙烯纤维，以及不同比例的粉煤灰、硅灰和矿粉等矿物掺合料对纤维增强砂浆力学性能的改善情况。试验结果表明：纤维和矿物掺合料对砂浆的强度特性都有显著影响。掺入不适宜比例的矿物掺合料，会造成矿物掺合料的“负混掺效应”抵消掺入纤维的正增强效应，造成砂浆抗压强度的降低。试验中得到了综合考虑混杂纤维和矿物掺合料作用下混杂纤维增强砂浆的强度改善效果的最优配合比。

Abstract: This paper mainly studies the effect of hybrid glass fiber and polypropylene fiber, as well as different proportions of mineral admixtures such as fly ash, silica fume and mineral powder, on the improvement of the mechanical properties of fiber-reinforced mortar. The results showed that: Both fibers and mineral admixtures have significant effects on the strength characteristics of mortar. Incorporating an inappropriate ratio of mineral admixtures will cause the “negative mixing effect” of the mineral admixtures, offset the “positive reinforcement effect” of the fibers, and reduce the compressive strength of the mortar. In the experiment, the optimal mix ratio was obtained which comprehensively considered the strength improvement effect of the fiber-reinforced mortar under the combined action of the hybrid fiber and the mineral admixture.