Research on Viscosity Reduction and Crack Resistance of Abrasion Resistant Concrete for Outlet Structure
In order to improve the workability and crack resistance of abrasion resistant concrete,and prolong the service life of lining concrete of spillway building,a new type of anti-crack viscosity reducer is selected.Taking the con-crete mixed with silica fume,fiber and HF agent as the comparison object,the working performance,mechanical proper-ties,abrasion resistance and crack resistance of four kinds of concrete are compared and analyzed.The results show that the plastic viscosity of abrasion-resistant concrete can be greatly reduced and the construction performance of concrete can be improved by adding anti-crack and viscosity reducer.On the whole,the compressive strength and tensile strength of concrete mixed with silica fume and anti-crack and viscosity reducer are better than those of other concrete,and the abra-sion resistance is 40%higher than that of HF concrete.As far as cracking resistance is concerned,silica fume+fiber con-crete>silica fume+anti-cracking viscosity reducer concrete>HF concrete.Therefore,the anti-cracking and viscosity reducer can effectively reduce the viscosity of abrasion-resistant concrete,improve the mechanical properties and abrasion-resistant strength,and reduce the risk of early cracking.
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