PCCP高强混凝土的配制及碱含量控制技术研究  

Mix Proportion Design of High Strength Concrete and Its Alkali Content Controlled Measures of PCCP

作　　者：纪国晋[1] 蒋家林 郭永峰[3] 鲁一晖[1] 

机构地区：[1]中国水利水电科学研究院结构材料所,北京100038 [2]北京市南水北调工程建设管理中心,北京100072 [3]南水北调中线干线工程建设管理局,北京100053

出　　处：《南水北调与水利科技》2008年第1期124-127,共4页South-to-North Water Transfers and Water Science & Technology

摘　　要：南水北调中线北京段PCCP管芯混凝土的强度设计等级为C50、C55、C60,属高强高性能混凝土,混凝土的耐久性将直接影响PCCP工程的安全运行和使用寿命,其中骨料的碱活性以及抑制措施是影响混凝土耐久性的关键问题之一。就其中的高强混凝土的配制和控制混凝土碱含量不大于2.5kg/m3的技术措施进行了试验研究。通过掺用优质粉煤灰、优化骨料的粒形与级配、优选聚羧酸系高性能减水剂等措施,PCCP高强管芯混凝土的碱含量可以满足2.5kg/m3的技术要求。The strength design grade of PCCP （prestressed concrete cylinder pipe） concrete in South-to-North Water Transfer Project is C50,C55, C60,which belongs to high strength and high performance concrete, the durability of concrete will directly affect the operation safety and service life of PCCP project,and the reactivity of alkali aggregate and total alkali content of concrete is one of the key problem. In this paper, mix proportion design of high strength concrete and its alkali content controlled measures of PCCP is studied. By incorporating high quality fly ash,optimization the grade of aggregate and selection of polycarboxylates high performance water-reducing admixture, the alkali content can satisfy 2. 5kg/m^3 requirement of PCCP concrete.

关 键 词：预应力钢筒混凝土管材(PCA3P) 聚羧酸系高性能减水剂 碱含量 粉煤灰 

分 类 号：TV41[水利工程—水工结构工程]