低水温下大流动性环氧树脂水下修补砂浆的制备  

Preparation of epoxy resin mortar with high flowability at low water temperature for underwater repair

作　　者：易旭涛 刘军[2] 相福壮 雷英强 丁建彤[2] YI Xutao;LIU Jun;XIANG Fuzhuang;LEI Yingqiang;DING Jiantong(Guodian Dadu River Drainage Area Hydroelectricity Development Co.,Ltd.,Leshan 614900,Sichuan,China;The Seventh Water Conservancy and Hydropower Engineering Bureau of China,Chengdu 611700,Sichuan,China)

机构地区：[1]国能大渡河流域水电开发有限公司龚嘴水力发电总厂,四川乐山614900 [2]中国水利水电第七工程局有限公司,四川成都611700

出　　处：《水利水电技术（中英文）》2024年第S01期422-428,共7页Water Resources and Hydropower Engineering

摘　　要：水电站泄水建筑物水下修补施工对环氧树脂修补砂浆的流动性有更高要求,特别是低水温环境下仍然具有大流动性、可以自流平。选用Dinger-Funk方程优化填料粒径分布,优选粒径分布指数为0.4、紧密堆积空隙率仅0.251%的填料,将环氧树脂砂浆流动度提高到18.3 cm;增加稀释剂用量,由20份增加到40份,5℃下环氧树脂基液黏度显著降低73%,砂浆流动度由13.5 cm提高到17.0 cm;为了抵消稀释剂掺量增加和低温所导致的砂浆强度降低,添加30份三环氧官能团树脂增加树脂基液活性,5℃下砂浆的28 d水下粘结强度和抗压强度分别为2.9 MPa、88 MPa,相比未添加的分别提高142%、115%。The underwater repair construction of hydropower station discharge structures requires higher fluidity of epoxy resin repair mortar,especially in low water temperature environments where it still has high fluidity and can self level.Using the Dinger Funk equation to optimize the particle size distribution of the filler,a filler with a particle size distribution index of 0.4 and a tightly packed porosity of only 0.251%is selected to increase the fluidity of the epoxy resin mortar to 18.3 cm;By increasing the amount of diluent from 20 parts to 40 parts,the viscosity of epoxy resin based solution significantly decreased by 73%at 5℃,and the fluidity of mortar increased from 13.5 cm to 17.0 cm;In order to counteract the decrease in mortar strength caused by the increase in diluent dosage and low temperature,30 parts of triepoxide functional group resin were added to increase the resin based liquid activity.The 28 d underwater bond strength and compressive strength of the mortar at 5℃were 2.9 MPa and 88 MPa,respectively,which were 142%and 115%higher than those without addition.

关 键 词：水下修补 环氧树脂砂浆 低温 流动度 水下强度 

分 类 号：TV46[水利工程—水工结构工程]