废玻璃砂浆材料的力学性能与耐久性能研究

Study on mechanical and durability performance of waste glass mortar

废弃材料替代水泥制备混凝土是响应“双碳”战略和水泥基材料可持续发展的重要举措。试验研究了废弃玻璃粉替代水泥砂浆的力学性能和耐久性能的影响规律,测量了不同质量替代率(0,10%,30%和50%)的废玻璃水泥砂浆材料的抗压强度、抗折强度、气体渗透系数和液态水渗透系数。结果表明,随着废弃玻璃粉替代率的增加,砂浆试块的抗压和抗折强度呈现先增大后减小的变化趋势,对于力学性能玻璃粉最优替代率为10%。此外,不同流体的渗透试验表明30%以下的替代率对渗透性影响非常微小,当替代率达到50%时废玻璃水泥浆的孔隙率达到峰值,相应的气体和液态水的渗透性也分别增大了1个和2~3个数量级。替代率的不同对砂浆材料微观结构影响显著,随着替代率的增加其孔隙直径也有所增大,并影响了砂浆材料的渗透性能。

Replacing cement with waste materials to prepare concrete is a key measure in response to the"peak carbon dioxide emission and carbon neutrality"strategy and the sustainable development of cement-based materials.In this paper,the effect of waste glass powder replacing cement mortar on mechanical and durability properties is experimentally studied,and the compressive resistance strength and flexural strength,the gas and water permeability of waste glass cement mortar materials with different quality substitution rates(0,10%,30%,and 50%)are measured.Results show that the com‑pressive strength and flexural strength of mortar blocks present a tendency of increasing first and then decreasing with the increase of substitution rates of waste glass powder.The optimal substitution rate for mechanical properties of glass powder is 10%.In addition,the permeability tests for different fluids show that the substitution rate below 30%present very little effect on the permeability.When the substitution rate reaches 50%,the porosity of waste glass cement mortar reaches its peak,and the corresponding gas permeability and water permeability also increase respectively 1 and 2~3 orders of magnitude.The substitution rate has a significant effect on the microstructure of mortar material,the pore diameter increases with the increase of substitution rate,which affects the permeability of mortar material.