水解处理后二次铝灰对混凝土基础性能的影响  

The Inf luence of Secondary Aluminum Dross after Hydrolysis Treatment on the Performance of Concrete Foundation

作　　者：潘一帆 张玉露 梁洪滔 张大康 

机构地区：[1]广东至道先进土木工程材料技术研究有限公司,广东佛山528300 [2]佛山市汇江混凝土有限公司,广东佛山528305

出　　处：《混凝土世界》2024年第2期18-24,共7页China Concrete

摘　　要：本文以二次铝灰的无害化处理及其在水泥基材料中的资源化利用为目的展开了系列试验探究,通过测试胶凝材料的水化热,混凝土工作性能、力学性能和体积稳定性,系统地评价了水解后二次铝灰对混凝土性能的影响。结果表明:水解处理8 h的二次铝灰对铝灰-水泥复合胶凝材料的早期水化放热具有抑制作用,使诱导期后的放热峰后移,降低了混凝土36 h以内的温升;水解后二次铝灰对混凝土抗压强度有一定程度的不利影响,一方面,当掺量超过10%时,混凝土的56 d抗压强度会下降约8.2%;另一方面,水解后二次铝灰的加入会产生早期微膨胀,对混凝土早期干燥收缩具有一定的补偿作用,当掺量达到10%时,混凝土的7 d干燥收缩降低约38%,对混凝土的体积稳定性具有积极作用。This paper aims to carry out a series of experimental investigations on the harmless treatment of secondary aluminum dross and its resource utilization in cement-based materials.By testing the hydration heat of cementitious materials,the workability and mechanical properties of concrete,and volume stability,the impact of hydrolyzed secondary aluminum dross on concrete performance is systematically evaluated.The results show that the hydrolysis treatment of secondary aluminum dross for 8 hours has an inhibitory effect on the early hydration heat release of aluminum dross-cement composite cementitious materials,postponing the peak of heat release after induction period and reducing the temperature rise within 36 hours of concrete.Hydrolysis of secondary aluminum dross has a certain adverse effect on the compressive strength of concrete.On the one hand,when the dosage exceeds 10%,the compressive strength of concrete at 56 days will decrease by more than 8.2%.On the other hand,the addition of hydrolyzed secondary aluminum dross can cause early micro-expansion,which has a certain compensation effect on the early drying shrinkage of concrete.When the dosage reaches 10%,the drying shrinkage of concrete at 7 days is reduced by about 38%,which has a positive effect on the volume stability of concrete.

关 键 词：二次铝灰 水泥基材料 抗压强度 水化热 干燥收缩 

分 类 号：TU528[建筑科学—建筑技术科学]