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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: Influence the dynamic compressive strength is FJSG, FJGS, FGJS, with the increase of the strain rate, that is the increase of the impact speed, the influence on the dynamic compressive strength of the concrete by the silicon powder also increases Experimental Program and Specimen Making 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. The ash is from heat-engine plant in XuZhou, the loss on ignition is 5%, the fineness is 17, the density is 2.35g/cm 3 , belongs to II ash. 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, for comparison, the paper also design the comparison experiment on mixing silicon powder, ash only. Dynamic Impact Test The incident bar is straight cone variable cross-section bar, its minimum diameter is 37mm, maximum diameter is 74mm.The paper conduct the experiment on 19 groups of test-pieces with different mix proportion, for concrete with ash only, we use 0.2MPa, 0.3MPa, 0.5MPa three pressure to do the impact test, for concrete with silicon powder only, we conduct 0.2MPa, 0.4MPa, 0.6MPa three pressure to do the impact test on the concrete with silicon powder and ash. Optimization Analysis of Orthogonal Factors We conduct the impact test under three pressure of the concrete with both ash and silicon powder under 0.2,0.3,0.6MPa, then get the stress-strain curve of the concrete as shown in Figure 1,2,3. It can be draw that: with the increase of the experimental strain rate, the failure stress in the test-pieces also increase. The strain rate of the concrete is under the range of 87-175s -1 , for concrete with silicon powder and ash, the dosage of group O-6 is best, the top stress of the concrete under 0.6MPa improved 27.1% compared with plain concrete. We can draw the conclusion from the range analysis in Table 1, under the low , intermediate and high strain rate, the primary and secondary factors that influence the dynamic compressive strength is FJSG,FJGS,FGJS, with the increase of the strain rate, that is the increase of the impact speed, the influence on the dynamic compressive strength of the concrete by the silicon powder also increases, it increase to rank 2 under the high strain rate from the last place in the four factors under the low

Silicon Powder and Ash Concrete Dynamic Performance