Optimization and Application Research of Rapid Repair Concrete Material Ratio
Through orthogonal experimental design,the influence of water-binder ratio,binder-sand ratio,ultra-fine mineral admixture and steel fiber admixture on the flow properties and basic mechanical properties of the rapid repair material were studied and the optimal ratio parameters were determined,and the expansion and shrinkage prop-erties and microstructure were analyzed.The results show that the most significant factors affecting the properties of the quick repair material are the water-binder ratio and the amount of steel fibers;The steel fibers in the quick repair material belong to the pull-out type of damage,and the amount of steel fibers has a significant effect on the flexural strength,but the effect on the compressive strength is relatively small;A set of best matching ra-tio is derived,in which the quick repair material not only has good flowability and high early strength,but also has good adhesive strength and volume stability.Under this ratio,the fast repair material not only has good flow-ability and high early strength,but also has good bonding strength and volume stability.The flexural and compres-sive strengths of 3h repair material are 13.7MPa and 27.8MPa respectively,the bonding strength of 3h repair struc-ture reaches 3.65MPa,and the limited expansion rate of 56d repair material is 326.5×10-6,which can better meet the open traffic of highway pavement and bridge expansion joints within 3h of repair.
Rapid repair materialsUltrafine mineral admixtureFlexural strengthBonding strength
万方数据
维普
