At present, the quality of mortar is still a technical difficulty in the connection of beam-slab hinge. Based on orthogonal test, laboratory test and theoretical analysis, the influence of water-binder ratio, cement-sand ratio and mineral admixtures on the mechanical properties of grout was studied by means of grey correlation theory and multiple linear regression. The results show that: 1)through the orthogonal test, the main performance of mortar material is the water-binder ratio, which has the greatest influence on the fluidity and 3 d compressive strength, and the mineral admixture combination has the greatest influence on 1 d and 28 d compressive strength; 2)according to the grey correlation theory, the water-binder ratio has the highest correlation with the fluidity and strength; 3)the linear regression equations- DOI:10.3969/j.issn.1000-1565.2021.06.003装配式梁板节点复合改性砂浆材料机理杨三强1,曹紫龙1,赵亚尊2,刘璐1,孙爽1(1.河北大学 建筑工程学院,河北省土木工程监测与性能评估技术创新中心,河北 保定 071002;2.汇通路桥建设集团有限公司,河北 高碑店 074000)摘 要:当前装配式混凝土桥梁结构节点间传力枢纽的节点材料质量问题是1个技术难点.基于荣乌高速节点间复合改性砂浆材料出现破损、脱落的问题,以正交试验为基础,室内实验和理论分析相结合,采用灰色关联理论和多元线性回归的方法,研究了水胶比、胶砂比、矿物掺和料对节点复合改性砂浆材料力学性能的影响.结果表明:1)根据正交试验可知,影响节点复合改性砂浆材料的主要性能是水胶比,水胶比对流动性和3 d抗压强度影响最大,矿物掺和料组合对1 d、28 d抗压强度影响最大.2)由灰色关联理论得到,水胶比对流动度和强度的相关性均最高,改变水胶比能极大的改变流动性和强度.3)通过多元线性回归分析,建立了水胶比和胶砂比与流动性和抗压强度的线性回归方程,得到流动度线性回归方程Y=-4.712+6.067x</sub>1+1.804x</sub>2;抗压强度线性回归方程Z=11.654+7.47x</sub>1+1.969x</sub>2.上述研究成果为装配式桥梁结构节点间复合改性砂浆材料的使用提供科学的理论支撑和技术指导.关键词:装配式;节点复合改性砂浆材料;正交试验;灰色关联理论;多元线性回归中图分类号:TU525.9 文献标志码:A 文章编号:1000-1565(2021)06-0645-09Mechanism of composite modified mortar with fabricated beam-slab jointsYANG Sanqiang1, CAO Zilong1, ZHAO Yazun2, LIU Lu1, SUN Shuang1(1. Hebei Civil Engineering Monitoring and Performance Evaluation Technology Innovation Center, College of Construction Engineering, Hebei University, Baoding 071002,China;2. Huitong Road and Bridge Construction Group Co., Ltd., Gaobeidian 074000,China)Abstract: At present, the quality of mortar is still a technical difficulty in the connection of beam-slab hinge. Based on orthogonal test, laboratory test and theoretical analysis, the influence of water-binder ratio, cement-sand ratio and mineral admixtures on the mechanical properties of grout was studied by means of grey correlation theory and multiple linear regression. The results show that: 1)through the orthogonal test, the main performance of mortar material is the water-binder ratio, which has the greatest influence on the fluidity and 3 d compressive strength, and the mineral admixture combination has the greatest influence on 1 d and 28 d compressive strength; 2)according to the grey correlation theory, the water-binder ratio has the highest correlation with the fluidity and strength; 3)the linear regression equations- 收稿日期:2020-12-31 基金项目:河北省建设厅资助项目(130000021);河北省交通运输厅科技项目(PHP-C34200-2503631-1);保定市科技局资助项目(1911ZG003) 第一作者:杨三强(1980—),男,四川绵阳人,河北大学教授,博士后,主要从事公路工程、路基路面工程研究.E-mail:ysq0999@163.con第6期杨三强等:装配式梁板节点复合改性砂浆材料机理of water binder ratio and cement sand ratio with the fluidity and compressive strength were established by means of multiple regression analysis,the linear regression equation of fluidity is obtained:Y=-4.712+6.067x</sub>1+1.804x</sub>2,and the linear regression equation of compressive strength Was also abtained:Z=11.654+7.47x</sub>1+1.969x</sub>2.The above research results can provide theoretical support and technical guidance for the use of cementitious materials for joints of fabricated concrete structures.
YANG Sanqiang
,
CAO Zilong
,
ZHAO Yazun
,
LIU Lu
,
SUN Shuang
. Mechanism of composite modified mortar with fabricated beam-slab joints[J]. Journal of Hebei University(Natural Science Edition), 2021
, 41(6)
: 645
-653
.
DOI: 10.3969/j.issn.1000-1565.2021.06.003装配式梁板节点复合改性砂浆材料机理
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