建筑渣土泥浆制备复合免烧轻质骨料及性能试验研究

Experimental study on preparation and performance of composite non-sintered lightweight aggregate from construction waste mud

提出了一种建筑渣土泥浆复合免烧轻质骨料的制备工艺,研究了水泥掺量、矿物掺合料种类和掺量对免烧轻质骨料密度、吸水率和筒压强度的影响,并进行了微观分析。结果表明,随水泥掺量的增加,骨料的密度和强度提高、吸水率减小;随粉煤灰掺量的增加,骨料的密度和强度降低、吸水率增大;以水泥-矿渣-泥浆复合体系制备的免烧轻质骨料性能最优,筒压强度达5.5 MPa。不同矿物掺合料对免烧轻质骨料的性能影响不同,取决于其参与二次水化反应程度及自身特性,其中以矿渣效果最佳,粉煤灰最弱。

The experiment presents a preparation process for construction waste mud composite non-sintered lightweight aggregates.The influence of cement content and mineral mixtures type and content on the density,water absorption and cylinder compressive strength of the non-sintered lightweight aggregate was studied,and microscopic analysis was conducted.The results show that with the increase of cement doping,the density and strength of aggregates increase,and the water absorption rate decreases.With the increase of fly ash content,the density and strength of aggregates are reduced,and the water absorption rate increases.The optimal aggregate performance prepared with cement slag composite system can reach the cylinder compressive strength of 5.5 MPa.Different mineral mixtures have different effects on the performance of non-sintered aggregates,depending on their participation in the secondary hydration reaction degree and their own characteristics,the slag powder has the best effect,while fly ash has the weakest effect.