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Through SHPB dynamic impact test, the dosage of silicon powder and fly ash in the concrete was researched, then the paper studied silicon powder and fly ash content on the effect of dynamic mechanical properties of concrete. The results showed that: The best group under low speed impact is J2G3F1S3; the best group under immediate speed impact is J2G2F1S2; the best group under high speed impact is J1G3F1S3. With the increase of the demand of the project construction, conduct the research on the dynamic performance and material characteristics under different strain rate of concrete with silicon powder become important and urgent, which can both help reduce the cost of producing concrete, benefit the environment and the sustainable development of economics and a way to make the limited resources to play a greater economic benefits. Research on the concrete with silicon powder mainly focus on compressive strength, resistance to corrosion, freezing resistance, impermeability and fracture property of the silicon powder[1-12], the research on the dynamic performance of the concrete with silicon powder is conducted by doing experiments of dynamic impact[13-15].The paper using the Φ74mm SHPB tester to do the mechanical property research under the impact load of the concrete with additives of silicon powder and ash, and using the principle of orthogonal test to optimize the best dosage of the silicon powder and the ash under the dynamic load. 1 Experimental program and specimen making 1.1 experiment materials The experiment uses the common P O52.5 concrete produced by the Huaihai Zhonglian concrete L.T.D. in XuZhou, the sand is the common river sand, the aggregate meets the continuous grading demand that the maximum particle diameter is 20mm. Water is the drinking water in XuZhou, water reducing agent is the efficient MN water reducing agent produced by the YunLong concrete additive plant in XuZhou, the water reducing rate is 15%-25%. The silicon powder is the TOPKEN920U tiny silicon powder produced by the Tiankai silicon powder materials L.T.D. in Shanghai, as shown inTable1. The ash is from heat-engine plant in XuZhou, the loss on ignition is 5%, the fineness is 17, the density is 2.35g/cm3, belongs to IIash. The paper considers four factors and three standards,which is water binder ratio, silicon powder, the dosage of the ash, sand coarse aggregate ratio. Conduct a design on the orthogonal test of mixing silicon powder and ash, as shown in Table1, for comparison, the paper also design the comparison experiment on mixing silicon powder, ash only. 35

Orthogonalization analysis of the Dynamic Performance of the Concrete with Additives of Silicon Powder and Ash