摘要
环氧砂浆涂层防护是提高水工建筑物抗冲磨性的有效途径之一。为改善普通环氧砂浆的抗冲磨性能,选用高韧性环氧树脂、低放热固化剂、级配填料等原料,制备出CW弹性环氧砂浆。比较了弹性环氧砂浆与其他环氧砂浆的力学性能,采用SEM分析弹性环氧砂浆的结构特点,并介绍了该材料的工程应用实例。研究结果表明:在冲磨72 h后,CW弹性环氧砂浆磨损较普通环氧砂浆降低40.5%,较改性环氧砂浆降低38.4%,抗冲磨强度提高72.4%;冲磨216 h后质量损失率仅为0.08%,216 h抗冲磨强度可达82.05 h/(kg/m 2),远远大于普通环氧砂浆。冲磨前涂层较为光滑平整,冲磨后结构发生形变,出现较多褶皱界面与少量凹坑,但整体仍紧密结合,呈现较为完整的连续相,说明CW弹性环氧砂浆具有较好的抗冲磨性能,能够很好地抵御冲磨破坏。实践证明,CW弹性环氧砂浆在消力池、水垫塘等大流量、高水头建筑物的抗冲磨防护方面表现优异,具有良好的应用前景。
Epoxy mortar coating protection is an effective approach to enhance the abrasion resistance of hydraulic structures.In order to improve the anti-abrasion properties of ordinary epoxy mortar,we prepared CW elastic epoxy mortar by using highly flexible epoxy resin,low-heat curing agent,graded filler and other raw materials.We compared the mechanical properties between elastic epoxy mortar and other epoxy mortars,then analyzed the structural characteristic of elastic epoxy mortar using SEM,and gave some engineering application examples.Results demonstrated that after grinding for 72 hours,the abrasion of CW elastic epoxy mortar is 40.5%lower than that of ordinary epoxy mortar,38.4%lower than that of modified epoxy mortar,and the anti-abrasion strength is 72.4%higher than that of modified epoxy mortar;after grinding for 216 hours,the mass loss rate is only 0.08%,and the anti-abrasion strength at the age of 216 h reaches 82.05 h/(kg/m 2),far greater than that of ordinary epoxy mortar.The coating is relatively smooth and flat before impact grinding,and the structure deforms after impact grinding,with folds and a few pits;but the whole is still closely combined,presenting a relatively complete continuous phase,which indicates that CW elastic epoxy mortar has good anti-abrasion property and well resists membrane destruction.Since CW elastic epoxy mortar has excellent performance in the anti-abrasion protection of buildings with large flow and high head,such as absorption basin and plunge pool,it is of great application prospect.
作者
邵晓妹
范冬冬
马保国
孙正
杨秀林
SHAO Xiao-mei;FAN Dong-dong;MA Bao-guo;SUN Zheng;YANG Xiu-lin(Engineering Technology Business Department of Kechuang Company,Yangtze River Scientific Research Institute,Wuhan 430010,China;Changjiang Kechuang Science and Technology Co.,Ltd.,Wuhan 430010,China;State Key Laboratory of Silicate Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《长江科学院院报》
CSCD
北大核心
2020年第6期166-170,共5页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51579019)。
关键词
弹性环氧砂浆
水工建筑物
抗冲磨性能
电镜扫描
工程应用
elastic epoxy mortar
hydraulic structure
anti-abrasion property
scanning electron microscope
engineering application
