原位聚合AMPS吸水树脂改性NHL对砂岩裂隙灌浆性能的影响  

Effect of in situ polymerization of AMPS-water absorptive resin modified NHL on the performance of sandstone crack grouting

作　　者：刘敏琪 柴玉梅 李允峰 闫宏斌 罗宏杰[5] 朱建锋[1,2,3] LIU Minqi;CHAI Yumei;LI Yunfeng;YAN Hongbin;LUO Hongjie;ZHU Jianfeng(School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,P.R.China;Institute of Heritage Conservation Science and Technology,Shaanxi University of Science and Technology,Xi’an 710021,P.R.China;Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials,Shaanxi University of Science and Technology,Xi’an 710021,P.R.China;Yungang Research Institute,Datong,Shanxi 037007,P.R.China;School of Cultural Heritage and Information Management,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]陕西科技大学陕西省无机材料绿色制备与功能化重点实验室,西安710021 [4]云岗研究院,山西大同037007 [5]上海大学文化遗产与信息管理学院,上海200444

出　　处：《重庆大学学报》2024年第10期172-180,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(52272020,52102108);中国博士后科学基金资助项目(2021M691997);陕西省教育厅重点科研计划资助项目(22JY009,22JY010)。

摘　　要：天然水硬性石灰(NHL)是在石质文物保护领域极具潜力的灌浆材料,但较低的强度和较高的脆性限制了其应用。采用一步法原位聚合制备了2−丙烯酰胺基−2−甲基丙磺酸(AMPS)吸水树脂,得到AMPS/NHL复合材料;通过XRD、FT-IR、SEM等手段对其进行了表征,通过等温量热仪监测AMPS吸水树脂改性前后NHL的水化放热情况;利用万能试验机测试了固化浆体的力学性能(抗压、抗弯以及黏接强度)。结果表明,AMPS在NHL浆体中产生的针网状结构能够在基体中起到穿针引线的作用,加强浆体内部联系,提高黏结效果,从而显著增强浆体的力学性能。3%的AMPS改性浆体在固化28 d后,抗压强度高达5.37 MPa,较改性前提高了60.7%,黏接和抗弯强度分别提高了12.8%和32.5%。Natural hydraulic lime(NHL)is a promising grouting material for stone heritage conservation,but is limited by low strength and high brittleness.2-acrylamide-2-methylpropanesulfonic acid(AMPS)water-absorbing resin was used to modify NHL through one-step in situ polymerization,and the obtained AMPS/NHL composite material was characterized by XRD,FT-IR and SEM.Isothermal calorimeter was adopted to monitor the hydration heat releases of NHL before and after AMPS water-absorbing resin modification.The mechanical properties(flexural,compressive and bonding strength)of the cured slurry were tested using a universal testing machine.The results indicate that the acicular network structure generated by AMPS in NHL slurry can strengthen the internal connection of the slurry,improve the bonding effect,and significantly enhance the mechanical properties of the slurry.After curing for 28 days,the compressive strength of 3%AMPS modified slurry increased by 60.7%to 5.37 MPa,with increase of 12.8%and 32.5%in bonding and bending strength,respectively.

关 键 词：原位聚合 2−丙烯酰胺基−2−甲基丙基磺酸 超吸水树脂 天然水硬性石灰 力学性能 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]