固废型透水砂浆的制备与基本性能研究

Study on preparation and basic properties of solid waste type permeable mortar

为了实现建筑垃圾的资源化利用,以废弃渣土为原材料利用免烧结技术制成再生细集料,对比研究了再生细集料替代机制砂以及粉煤灰、再生微粉替代水泥制备的固废型透水砂浆的强度和透水性变化规律。结果表明,当再生细集料掺量在20%以内,对砂浆的抗折、抗压强度影响不大,且能提高固废型透水砂浆的透水性;粉煤灰掺量在15%以内对固废型透水砂浆影响不大,但随着掺量增加会大大降低固废型透水砂浆强度和透水性;再生微粉对固废型透水砂浆的强度和透水性影响较大,主要与其粒径较粗、活性低有关,对配制强度有严格要求的固废型透水砂浆时,再生微粉适宜掺量为胶凝材料的5%。

In order to realize the resource utilization of construction waste,uses waste residue as raw material to make recycled fine aggregate by non-sintering technology,and compares and studies the change law of strength and water permeability of solid waste permeable mortar prepared by different mixtures of recycled fine aggregate instead of machine-made sand and different mixtures of fly ash and recycled fine powder instead of cement.The results show that when the content of recycled fine aggregate is less than 20%,it has little effect on the bending and compressive strength of mortar,but can improve the water permeability of solid waste type permeable mortar.When the fly ash content is less than 15%,the above properties are not affected.The increase of fly ash content reduces the strength and water permeability of solid waste type permeable mortar.The regenerated micropowder has great influence on the strength and water permeability of solid waste type permeable mortar,which is mainly related to the low activity of regenerated micropowder and coarser particle size.When the strength of permeable mortar is strictly required,the optimum content of reclaimed micro powder is 5%of the cementitious material.