C55砂岩机制砂混凝土在肯尼亚蒙内铁路工程中的

2.中国路桥工程有限责任公司，北京  100011；3.中交四航局第一工程有限公司，广东 广州  510310）

    摘要：根据肯尼亚蒙内标轨铁路工程C55箱梁混凝土的技术要求，结合当地砂岩机制砂的特点，开展了C55强度等级砂岩机制砂混凝土的配制技术研究。试验分析了水胶比、胶凝材料总用量、砂率、粉煤灰掺量及机制砂石粉含量等因素对C55高强机制砂混凝土工作性、力学性能及抗氯离子侵蚀性能的影响，确定了C55砂岩机制砂混凝土配合比设计关键参数和设计原则，并在蒙内铁路工程箱梁中得到推广应用，技术经济效果良好。

    关键词：砂岩机制砂；高强混凝土；配合比参数；力学性能；抗氯离子侵蚀

    中图分类号：TU528        文献标识码：A        文章编号：1001-702X（2018）07-0055-05

　

Application of sandstone manufactured sand concrete of C55 in mombasa-nairobi

railway project of Kenya

YANG Haicheng1，YE Xiaolin2，SHENG Yufei3，LUO Yunjian3

（1.Key Laboratory of Harbor & Marine Structure Durability Technology of the Ministry of Communications，

Guangzhou 510230，China；2.China Road and Bridge Corporation，Beijing 100011，China；

3.The First Engineering Company of CCCC Fourth Harbor Engineering Co. Ltd.，Guangzhou 510310，China）

    Abstract：According to technical requirements of C55 box girders for Mombasa-Nairobi Standard Gauge Railway Project of Kenya，the research of preparation technology for sandstone manufactured sand concrete of C55 were taken considering characteristics of local sandstone manufactured sand. Influences of W/B，cementitious material consumption，sand coarse aggregate ratio，fly ash content and sand power content on the workability，mechanical properties and chloride resistance of C55 concrete had been analyzed. Mixture ratio design key parameters and design principle of C55 had been definite，and widely used in railway box girder project. Technical and economic effects were very good.

    Key words：sandstone manufactured sand，high-strength concreter，mixture parameters，mechanical property，chloride penetration resistance