Abstract

To enhance the thermal durability and at the same time to achieve the sustainability in this paper, a novel approach of using fly ash based geopolymer mortar had been introduced to protect the steel wire mesh layer present in the ferrocement panels. Parametric study was done to study the influence of role of wire mesh, volume fraction from 0.8% to 1.96%, changes in temperature of heating and the application of geopolymer mortar on the ferrocement to analyse their effect on the post fire mechanical properties such as load-deflection behaviour, stress–strain behaviour, percentage of strength retained, moment of resistance and Young’s modulus. Although the cement mortar showed higher retained strength upto 600 °C, the geopolymer had the maximum retained strength after 900 °C due to the gradual improvement of geopolymerisation process. The retained strength ranged between 46.3–99.1% and 34.91–88.78% for the ferrocement panels with geopolymer and cement mortar respectively. Ferrocement panel with geopolymer mortar showed 12.9% improvement in the post fire flexural strength at 900 °C for the volume fraction of 1.8% as the geopolymer mortar possessed double the times enhanced retained compressive strength of cement mortar after fire exposure.

摘要

为了提高热耐久性并同时实现本文的可持续性，引入了一种使用粉煤灰基地质聚合物砂浆的新方法来保护存在于钢筋水泥板上的钢丝网层。进行了参数研究，研究了金属丝网的作用、体积分数从0.8%到1.96%、加热温度的变化以及地质聚合物砂浆对钢筋水泥的影响，分析了它们对火灾后荷载等力学性能的影响。 -挠度行为、应力-应变行为、保留强度百分比、抗性力矩和杨氏模量。虽然水泥砂浆在 600 ℃时显示出较高的保留强度，但由于地质聚合工艺的逐步改进，地质聚合物在 900 ℃后具有最大保留强度。具有地质聚合物和水泥砂浆的钢筋水泥板的保留强度分别在 46.3-99.1% 和 34.91-88.78% 之间。具有地质聚合物砂浆的钢筋水泥板在 900°C 下，体积分数为 1.8%，火灾后抗弯强度提高了 12.9%，因为地质聚合物砂浆在火灾暴露后的保留抗压强度提高了两倍。