高耐久性大管桩混凝土配制技术与应用  

Preparation technology and application of high durability large pipe pile concrete

作　　者：王成启[1] 张兆民 WANG Chengqi;ZHANG Zhaomin(China Communications Shanghai Third Harbor Engineering Science and Technology Research Institute Co.,Ltd.,Shanghai 200032,China;Ningbo Branch of China Communications Third Harbor Engineering Co.,Ltd.,Ningbo 315803,China)

机构地区：[1]中交上海三航科学研究院有限公司,上海200032 [2]中交第三航务工程局有限公司宁波分公司,浙江宁波315803

出　　处：《水运工程》2024年第10期27-32,共6页Port & Waterway Engineering

摘　　要：为了提高大管桩混凝土的耐久性,开展高耐久性大管桩混凝土配制技术试验研究与应用。在传统大管桩混凝土配合比的基础上,采用矿渣粉改善混凝土的性能,通过复掺矿渣粉与硬石膏保证大管桩混凝土的脱模强度,对各配合比的混凝土进行维勃稠度、抗压强度、电通量和扩散系数试验,并采用室内试验确定的混凝土配合比进行生产应用。结果表明,单掺矿渣粉明显改善了大管桩混凝土耐久性,但会导致大管桩脱模强度降低;采用石膏粉和矿渣粉复合可明显提升大管桩混凝土脱模强度,并具有良好的耐久性。采用高耐久性大管桩混凝土配合比生产的大管桩管节外观质量良好,混凝土抗压强度等级达到C70,电通量小于800 C,具有较高的耐久性。In order to improve the durability of concrete for large pipe piles,we carry out the test research and application of high durability concrete preparation technology for large pipe piles.Based on the traditional concrete mix ratio for large pipe piles,we apply the slag powder to improve the performance of concrete,and ensure the concrete demoulding strength of large pipe pile by the composite of gypsum powder and slag powder.We carry out the Webe consistometer,the compressive strength,electric flux and diffusion coefficient tests for each mix ratio,and use the concrete mix ratio determined by laboratory test to apply in the actual production.The results show that adding slag powder alone can significantly improve the durability of concrete for large pipe piles,but it leads to a decrease in the demoulding strength of large pipe piles.The composite of gypsum powder and slag powder can significantly improve the demoulding strength of large pipe pile concrete and has good durability.By using a high durability concrete mix ratio for large pipe piles,the appearance quality of the produced pipe joints is good,the compressive strength of the concrete reaches C70,and the electrical flux is less than 800 C,which has high durability.

关 键 词：高耐久性 大管桩 脱模强度 电通量 

分 类 号：U654[交通运输工程—港口、海岸及近海工程] U655.55[交通运输工程—船舶与海洋工程]