Experimental Study On The Pavement Performance Of Styrene-butadiene Modified Steel Fiber Reinforced Concrete

Steel fiber reinforced concrete is a kind of common material used to pave and repair pavement.Many tests have shown that steel fiber does not exert the effect that reinforcing concrete completely,this is due to the defect of nature and weak bond strength between matrix and steel fiber.Styrene-butadiene latex is a kind of polymer dispersion,it can disperse easily in concrete and form membrane structure with strong adsorption capacity after dehydration.It is necessary to make clear the effect on the performance of steel fiber reinforced concrete.Basic mechanical properties,impact resistance,bond capacity with old concrete and durability have been studied in this paper.In the process of making the experimental plan,several experimental index and methods were adjusted,including: Weibull distribution was used to census the data,fracture number and width were regard as the new index,the impact resistance under the same failure probability was compared.Replacing loss rate of mass with scaled mass during freeze-thaw cycle and adding the loss rate of strength as a new experimental index,the difference of abrasion loss between surface and side was compared,determining the relationship between flexural strength and abrasion resistance.After lots of experiments and scanning electron microscopy tests,the following conclusions are obtained: styrene-butadiene latex can modify the bond strength between matrix and steel fiber,meanwhile,flexural strength,splitting tensile strength,flexibility,impact resistance,the bond strength with old concrete durability,Including impermeability,frost resistance,abrasion resistance.