泄水建筑物冲刷界面混凝土修复材料及应用
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摘要
为了缓和修复材料与老混凝土之间的性能差别梯度,改善冲刷界面混凝土修复效果,研制了四种组合修复材料,对其修复机理及性能进行分析,建立了混凝土-胶结提质材料两相硬化夹杂模型和修复结构薄板模型,对混凝土表面的提质性能及修复结构的完整性进行验证,并在凤滩水电站3#孔溢流面进行现场原型试验。结果表明:胶结提质材料具有良好的浸渗能力,可浸渗C30混凝土表层35 mm,且对浸渗的混凝土强度提质20%左右,减小了修复结构中老混凝土与修复材料之间的强度差,防止因老混凝土性能不足导致的再次破坏;界面粘接材料具有良好的粘接性能,可确保结构的完整性;主体修复材料具有良好的抗冲磨性能,在相同试验条件下,抗冲磨强度是广化所研制的YDS的1. 5倍,磨损率只有YDS的38%;层面保护材料具有良好的耐紫外线能力,极大程度的延长了修复结构的使用寿命;现场修复效果良好,经大流量泄洪(单宽流量8000 m~3/s)后,测试其磨损率不到0. 1%,可推广应用于水工结构多类病险修复工程中。
In order to alleviate the performance difference gradient between the repair material and the old concrete,and improve the concrete repair effect of the scouring interface,four kinds of composite repair materials were developed. The repair mechanism and performance were analyzed. The two-phase hardened inclusion of concrete-cemented upgraded material was established. The model and the repaired structural thin-plate model were used to verify the upgrading performance of the concrete surface and the integrity of the repaired structure,and the on-site prototype test was carried out on the 3# hole overflow surface of Fengtan Hydropower Station. The results show that the cemented material has good impregnation ability,can infiltrate the surface of C30 concrete by 35 mm,and has 20% of the strength of the infiltrated concrete,which reduces the between the old concrete and the repairing material in the repair structure. Poor strength to prevent re-destruction caused by insufficient performance of old concrete. Interface bonding material has good bonding performance to ensure structural integrity. Main body repair material has good anti-wear performance,under the same test conditions,anti-jwear The impact strength is 1. 5 times that of the YDS developed by Guanghua,and the wear rate is only 38% of YDS. The layer protection material has good UV resistance,which greatly prolongs the service life of the repair structure; After large-flow flood discharge (single-width flow of 8000 m~3/s),the wear rate is less than 0. 1%,which can be applied to many types of disease repair projects in hydraulic structures.
In order to alleviate the performance difference gradient between the repair material and the old concrete,and improve the concrete repair effect of the scouring interface,four kinds of composite repair materials were developed. The repair mechanism and performance were analyzed. The two-phase hardened inclusion of concrete-cemented upgraded material was established. The model and the repaired structural thin-plate model were used to verify the upgrading performance of the concrete surface and the integrity of the repaired structure,and the on-site prototype test was carried out on the 3# hole overflow surface of Fengtan Hydropower Station. The results show that the cemented material has good impregnation ability,can infiltrate the surface of C30 concrete by 35 mm,and has 20% of the strength of the infiltrated concrete,which reduces the between the old concrete and the repairing material in the repair structure. Poor strength to prevent re-destruction caused by insufficient performance of old concrete. Interface bonding material has good bonding performance to ensure structural integrity. Main body repair material has good anti-wear performance,under the same test conditions,anti-jwear The impact strength is 1. 5 times that of the YDS developed by Guanghua,and the wear rate is only 38% of YDS. The layer protection material has good UV resistance,which greatly prolongs the service life of the repair structure; After large-flow flood discharge (single-width flow of 8000 m~3/s),the wear rate is less than 0. 1%,which can be applied to many types of disease repair projects in hydraulic structures.
引文
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[2]李金玉.水工混凝土建筑物剥蚀破坏的修补[J].水利水电技术,1994(3):2-8.
[3]张振忠,陈亮,汪在芹,等.水工泄水建筑物抗冲磨材料发展现状[J].化工新型材料,2016(10):230-232.
[4]包银鸿,程红,陆志华.水下混凝土缺陷处理的工法研究-材料部分[J].大坝与安全,2005(2):21-28.
[5]Gao Y W,Deng K S,Xie W L,et al.The Property of the concrete damage reconstructive materials and repair technology[C].International Conference on Road&Airfield Pavement Technology,2002:1144-1147.
[6]王凯,葛翠翠,李柏殿,等.公路桥梁伸缩缝过渡区混凝土修复技术研究[J].硅酸盐通报,2017,36(8):2838-2843.
[7]周健,叶光,Van Breugel K.混凝土修复中水分交换对水泥水化、微观结构和界面黏结强度的影响(英文)[J].硅酸盐学报,2010,38(9):1665-1670.
[8]Beushausen H,Hohlig B,Talotti M,et al.The influence of substrate moisture preparation on bond strength of concrete overlays and the microstructure of the OTZ[J].Cement and Concrete Research,2017:84-91.
[9]赵吉东,周维垣,黄岩松,等.岩石混凝土类材料损伤局部化分叉研究及应用[J].岩土工程学报,2003(1):80-83.
[10]张智慧,王安辉,荣辉,等.新型外源性渗透修复材料对混凝土裂缝修复效果研究[J].混凝土,2017(10):123-125+130.
[11]刘引烽.涂料界面原理与应用[M].北京:化学工业出版社,2007,7,202-205.
[12]白卫峰,陈建云,范书立.细观夹杂理论预测湿态混凝土抗压强度[J].工程力学,2008(11):134-140.
[13]郝巨涛,黄昊.环氧砂浆修补薄层的原型观测试验结果研究[J].水利学报,2010(1):120-126.
[14]张振忠,汪在芹,陈亮.改性环氧砂浆抗冲磨材料性能研究[J].水力发电,2016(6):95-98.
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