《南水北调与水利科技》：PCCP高强混凝土的配制及碱含量控制技术研究（纪国晋,蒋家林,郭永峰,鲁一晖）（摘要）

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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。

关键词：预应力钢筒混凝土管材（PCCP）；聚羧酸系高性能减水剂；碱含量；粉煤灰

中图分类号：TV41 文献标识码：A 文章编号：1672-1683（2008）01-0124-04

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

JI Guo-jin1,JIANG Jia-lin2,GUO Yong-feng3,LU Yi-hui1

(1.Department of Structure and Materials,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;

2.Beijing Engineering Construction Management Centre of the South-to-North Water Transfer,Beijing,100072,China;

3.The Administration Bureau of the Middle Route of the South-to-North Water Transfer,Beijing,100053,China;)

Abstract: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 imcorporating high quality fly ash,optimization the grade of aggregate and selection of polycarboxylates high performance water-reducing admixture,the alkali content can satisfy 2.5 kg/m3 requirement of PCCP concrete.

Key words:prestressed concrete cylinder pressure pipe;polycarboxylates high performance water-reducing admixture;alkali content;fly ash

参考文献：

[1]DL/T5151-2001，水工混凝土砂石骨料试验规程[S].

[2]纪国晋.南水北调中线工程PCCP管芯混凝土碱含量控制和骨料碱活性抑制措施[R].北京：中国水利水电科学研究院，2006.

作者简介：纪国晋（1971-）男，安徽全椒人，硕士，高级工程师，主要从事水工新材料的开发研究与应用。

来源：《南水北调与水利科技》2008年第1期

推荐访问:南水北调配制技术研究混凝土含量