Relying on the expressway project of Hubei Enlai and Enqian, through controlling raw materials quality strictly and optimizing the mix proportion, C50 excellent performance concrete with manufactured-sand is made, also proposing the pouring and conservation measures for the cast-in-situ box girder. The manufactured-sand concrete is successfully used in practical engineering.%依托湖北恩来恩黔高速公路工程，通过对原材料质量的控制及配合比的优化，配制出了性能优良的C50机制砂现浇箱梁混凝土，并提出了箱梁混凝土的浇筑、养生措施，实现了C50机制砂箱梁混凝土在实际工程中的成功应用。
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