摘   要：对不同百分比掺量的纳米SiO₂和钢纤维做了正交试验，进行了7d，28d抗压强度和劈裂抗拉强度试验研究。结果表明，掺入纳米SiO₂能显著提高混凝土早期抗压强度，掺量为1.2%时抗压强度提高24.5%。掺入钢纤维能显著提高混凝土劈裂抗拉强度，钢纤维体积率掺量达到1.6%时劈裂抗拉强度提高78.6%。纳米SiO₂和钢纤维的复合掺入，可显著优化补偿收缩混凝土的力学性能。

Abstract: Taking different percentage of dosage of nano-SiO₂ and steel fibers for orthogonal tests, the results of compressive strength and resistance to splitting strength for 7d, 28d have been analyzed. The results show that adding nanometer SiO₂ can remarkably improve the early compressive strength of concrete, when mixing content is 1.2%, the compressive strength can increase 24.5%. Adding steel fiber can remarkably improve the concrete resistance to splitting strength, when mixing content is 1.6%, the resistance to splitting strength can increase 78.6%. The shrinkage compensating concrete mechanical properties can significantly optimized through the mixing of nano-SiO₂ and steel fiber.