钢管自密实轻骨料混凝土变形性能试验研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (5): 1497-1502.

所属专题：水泥混凝土

钢管自密实轻骨料混凝土变形性能试验研究

李书明^1,2, 郑新国^1,2, 刘竞^1,2, 谢永江^1,2, 胡家林^1,2, 张旭^1,2

1.中国铁道科学研究院集团有限公司,铁道建筑研究所,北京 100081;
2.中国铁道科学研究院集团有限公司,高速铁路轨道技术国家重点实验室,北京 100081

收稿日期:2020-12-15 修回日期:2021-03-19 出版日期:2021-05-15 发布日期:2021-06-07
通讯作者: 郑新国,博士研究生,研究员。E-mail:zhengxinguo@sina.com
作者简介:李书明(1984—),男,副研究员。主要从事高性能混凝土方面的研究。E-mail:lsm7141739@163.com
基金资助:
国家重点研发计划(2017YFB0310000);中国铁道科学研究院基金(2018YJ053)

Deformation Performance of Steel Tube Self-Compacting Lightweight Aggregate Concrete

LI Shuming^1,2, ZHENG Xinguo^1,2, LIU Jing^1,2, XIE Yongjiang^1,2, HU Jialin^1,2, ZHANG Xu^1,2

1. Railway Engineering Research Institute, China Academy of Railway Sciences Group Co., Ltd., Beijing 100081, China;
2. State Key Laboratory for Track Technology of High Speed Railway, China Academy of Railway Sciences Group Co., Ltd., Beijing 100081, China

Received:2020-12-15 Revised:2021-03-19 Online:2021-05-15 Published:2021-06-07

摘要/Abstract

摘要： 采用堆积密度分别为500 kg/m³、800 kg/m³的页岩陶粒和堆积密度为1 600 kg/m³的普通碎石作为粗骨料配制自密实轻骨料混凝土和普通混凝土,并成型了钢管轻骨料混凝土与钢管普通混凝土,对比研究了二者的收缩应变、轴压应力-应变变化规律和温度-应变变化规律。结果表明:随着粗骨料堆积密度的降低,同配比轻骨料混凝土的密度、强度和弹性模量均逐渐降低;相同龄期时,钢管轻骨料混凝土及其核心轻骨料混凝土的收缩应变均小于钢管普通混凝土及其核心混凝土的收缩应变,钢管与核心轻骨料混凝土的密贴性更好;钢管轻骨料混凝土的轴压应力-应变变化规律与钢管普通混凝土的基本相同,与钢管普通混凝土相比,钢管轻骨料混凝土的弹性模量有所降低,但比非钢管约束状态下轻骨料混凝土弹性模量的降低幅值有所减小;钢管轻骨料混凝土与钢管普通混凝土的温度-应变相当,均为4.0 με/℃左右。

关键词: 钢管混凝土, 轻骨料混凝土, 自密实, 收缩应变, 热膨胀系数

Abstract: Using shale ceramsite with bulk density of 500 kg/m³ and 800 kg/m³ and gravel with bulk density of 1 600 kg/m³ as coarse aggregates to prepare self-compacting lightweight aggregate concrete and ordinary concrete, forming steel tube lightweight aggregate concreteand ordinary concrete-filled steel tube. Compared with ordinary concrete-filled steel tube, the shrinkage strain, axial compression stress-strain change rule and temperature-strain change rule of the two are contrasted. The results show that as the bulk density of coarse aggregate decreases, the density, strength and elastic modulus of the same proportion of lightweight aggregate concrete gradually decrease. At the same age, the shrinkage strain of steel tube lightweight aggregate concrete is smaller than that of steel tube ordinary concrete, and the shrinkage strain of core lightweight aggregate concrete is also smaller than that of core ordinary concrete, better adhesion between steel tube and core lightweight aggregate concrete. The axial compression stress-strain change law of lightweight aggregate concrete-filled steel tube is basically the same as that of ordinary concrete-filled steel tube. Compared with ordinary steel tube concrete, the elastic modulus of steel tube lightweight aggregate concrete is reduced, but it is smaller than the reduction amplitude of lightweight aggregate concrete under non-steel tube confinement state. The temperature-strain of lightweight aggregate steel tube concrete and ordinary steel tube concrete are equivalent, both are about 4.0 με/℃.

Key words: concrete-filled steel tube, lightweight aggregate concrete, self-compacting, shrinkage strain, thermal expansion coefficient

中图分类号:

TU528.2

李书明, 郑新国, 刘竞, 谢永江, 胡家林, 张旭. 钢管自密实轻骨料混凝土变形性能试验研究[J]. 硅酸盐通报, 2021, 40(5): 1497-1502.

LI Shuming, ZHENG Xinguo, LIU Jing, XIE Yongjiang, HU Jialin, ZHANG Xu. Deformation Performance of Steel Tube Self-Compacting Lightweight Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1497-1502.

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钢管自密实轻骨料混凝土变形性能试验研究

Deformation Performance of Steel Tube Self-Compacting Lightweight Aggregate Concrete

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