TEA-DEC复掺对天然水硬性石灰早期硬化过程的影响  

Effect of TEA-DEC compounding on the early hardening process of natural hydraulic lime

作　　者：魏小红 柴玉梅[1,2,3,4] 李允峰 罗宏杰 王雯雯[1,2,3,4] 张彪 秦宇星[1,2,3,4] WEI Xiaohong;CHAI Yumei;LI Yunfeng;LUO Hongjie;WANG Wenwen;ZHANG Biao;QIN Yuxing(School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi’an,Shaanxi 710021,P.R.China;Institute of Heritage Conservation Science and Technology,Shaanxi University of Science and Technology,Xi’an,Shaanxi 710021,P.R.China;Underground Cultural Relics Protection Materials and Technology Key Laboratory Under the Ministry of Education,Shaanxi University of Science and Technology,Xi’an,Shaanxi 710021,P.R.China;Silk Road Cultural Heritage and Innovation Design Research Center,Shaanxi University of Science and Technology,Xi’an,Shaanxi 710021,P.R.China;Institute for the Conservation of Cultural Heritage,Shanghai University,Shanghai 200444,P.R.China)

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021 [2]陕西科技大学文物保护科学与技术学院,西安710021 [3]陕西科技大学地下文物保护材料与技术教育部重点实验室,西安710021 [4]陕西科技大学丝路文化传承与创新设计研究中心,西安710021 [5]上海大学文化遗产保护基础科学研究院,上海200444

出　　处：《重庆大学学报》2024年第8期141-151,共11页Journal of Chongqing University

基　　金：国家自然科学基金项目(52272020);陕西省教育厅重点科学研究计划项目(23JZ023);国家级大学生创新创业训练项目(202310708041)。

摘　　要：天然水硬性石灰(NHL)早期强度低、固化慢的特性影响其在石质文物中的广泛应用,提高NHL早期综合性能是一项具有应用价值的研究。三乙醇胺(TEA)是水泥中常用的早强剂,碳酸二乙酯(DEC)是一种高效稳定的CO_(2)吸收剂,文中将两者复掺改性天然水硬石灰浆体,以提高早期硬化反应效率和力学强度。结果表明,复掺改性使TEA与DEC能够发挥出高效的协同作用,促进水化和碳化反应;降低浆体内部的总孔隙率,促使内部更致密、基体结构更稳定;当TEA-DEC复掺参数质量分数为0.3%、0.5%时,综合改性效果最佳,初凝和终凝时间分别缩短了18%和45.5%,力学性能得到明显改善,养护28 d时抗压强度可提高27.3%,相当于欧洲标准中NHL5的强度水平。The low early strength and slow curing characteristics of natural hydraulic lime(NHL)limit its wide application in stone cultural relics.Improving its early comprehensive performance is a study with significant practical value.Triethanolamine(TEA)is a commonly used early-strengthening agent in cement,while diethyl carbonate(DEC)is a highly efficient and stable CO_(2)absorber.In this paper,we combine the advantages of these two materials to compound-modify natural hydraulic lime slurry(NHL)to improve the efficiency of early hardening reactions and mechanical strength.The results show that the compounding modification of TEA and DEC exhibites an efficient synergistic effect,significantly promoting hydration and carbonation reactions.The total porosity within the slurry is reduced,contributing to a denser and more stable matrix structure.The optimal modification effect is achieved with TEA-DEC mass fraction of 0.3%and 0.5%..The initial and final setting times are shortened by 18%and 45.5%,respectively.The mechanical properties are obviously improved,with compressive strength increased by 27.3%after 28 days of maintenance,reaching the strength level of NHL5 in the European standard.

关 键 词：天然水硬性石灰 三乙醇胺 碳酸二乙酯 水化 碳化 

分 类 号：TB332[一般工业技术—材料科学与工程]