矿物掺合料对废弃贝壳砂浆的力学性能和耐久性的影响  

Influence of mineral admixtures on the mechanical property and durability of waste oyster shell mortar

作　　者：廖迎娣[1,2,3] 王鑫[1] 封嘉蕊 孟彦廷 陈达[1,2,3] 达波 Liao Yingdi;Wang Xin;Feng Jiarui;Meng Yanting;Chen Da;Da Bo(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Coastal Disaster and Defence of Ministry of Education,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Hohai University,Nanjing 210098,China;Nanjing R&D High-Tech Co.Ltd.,Nanjing 210024,China)

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]河海大学海岸灾害及防护教育部重点实验室,南京210098 [3]河海大学长江保护与绿色发展研究院,南京210098 [4]南京瑞迪高新技术有限公司,南京210024

出　　处：《Journal of Southeast University(English Edition)》2023年第3期277-283,共7页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51509081,52208241);Jiangsu Provincial Key Research and Development Program(No.BE2020715)。

摘　　要：为有效减少水产养殖废弃物对环境的污染,研究了破碎废弃贝壳(WOS)作为砂浆骨料的可行性.分析了粉煤灰(FA)/矿渣(SG)质量分数(0%、20%、30%、40%)和养护龄期对WOS砂浆的工作性能、力学性能和耐久性的影响,探讨了WOS砂浆的生态经济效益.结果表明:在养护初期阶段,添加矿物掺合料WOS砂浆的抗压强度和静弹性模量略有降低,但是随着养护龄期的增长,WOS砂浆的力学性能有所改善;利用FA/SG取代部分水泥,可有效提高WOS砂浆的抗氯离子渗透性能,降低其干缩率;在满足工程应用要求的前提下,使用WOS砂浆可有效减少CO_(2)排放约29%.To mitigate the environmental pollution caused by aquatic waste,crushed waste oyster shell(WOS)was added as an aggregate to the mortar.The impact of varying dosages(0%,20%,30%,and 40%)of fly ash(FA)/slag powder(SG)and curing periods on the workability,mechanical properties,and durability of the resulting mixtures were investigated.Furthermore,the ecological and economic benefits of WOS mortars were examined.The findings reveal that the compressive strength and static modulus of elasticity in WOS mortar decreased moderately after adding the mineral admixture during the initial curing phase.However,the mechanical properties of WOS mortar improved upon extending the curing period.Additionally,the partial replacement of cement with FA/SG promoted the migration ability of chloride and minimized the drying shrinkage in WOS mortars.In scenarios where engineering application requirements are satisfied,the utilization of WOS mortar could reduce CO 2 emissions by 29%.

关 键 词：废弃贝壳砂浆 工作性能 力学性能 耐久性 生态经济效益 

分 类 号：TU528[建筑科学—建筑技术科学]