Study on the improvement of the performance of silicon fume anti-abrasion concrete by anti-cracking viscosity reducer
[Objective]High strength silica fume concrete generally has the problems of high viscosity,difficult construction and high cracking risk,which seriously affects the service performance of anti-abrasion concrete in discharge structures.Therefore,the design of anti-abrasion concrete should simultaneously consider anti-abrasion performance,construction performance and cracking resistance.[Methods]The authors have previously developed a new type of anti-cracking viscosity reducer for concrete by combining expansion components,viscosity reducing components and other additives.Taking a water conservancy project in Xinjiang as the object,the effects of anti-crack viscosity reducer on workability,mechanics,deformation,crack resistance,im-pact wear and other properties of different strength grades of silica fume concrete are studied.The effect of improving the perform-ance of silica powder impact resistance concrete was evaluated comprehensively,in order to comprehensively evaluate its improve-ment effect on the performance of silicon powder anti-abrasion concrete.[Conclusion]The result show that the anti-cracking vis-cosity reducer can be used to prepare anti-abrasion concrete with different grades of C9055,C9050 and C2840,and can significant-ly improve the construction performance and crack resistance of silicon fume anti-abrasion concrete.[Results]The addition of 7%anti-cracking viscosity reducer has little effect on slump,gas content and setting time of concrete,but can reduce the plastic viscosity of C9055,C9050,and C2840 silica fume concrete by 64%to 76%,and the yield shear stress by 26%to 36%.Compared with silica fume concrete,the shrinkage deformation of concrete mixed with silica fume and anti-cracking viscosity reducer de-creased,and the autogenous volume deformation was characterized by expansion throughout the 110 days,and the total cracking area per unit area in the plate test decreased by 63%to 83%.In addition,the incorporation of anti-cracking viscosity reducer was conducive to improve the internal compactness of concrete,which could slightly improve the compressive and tensile strength of concrete,and the anti-abrasion strength of underwater steel ball method could be increased by 14%to 40%.
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