苏州混凝土水泥制品研究院有限公司

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超高性能混凝土的自收缩特性研究
Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete(UHPC)
2019年第7期
超高性能混凝土(UHPC);自收缩;钢纤维;水化
Ultra high performance concrete(UHPC); Autogenous shrinkage; Steel fiber; Hydration
2019年第7期
10.19761/j.1000-4637.2019.07.001.04
国家重点研发计划(2017YFB0310000);国家自然科学基金(51702242);湖北省技术创新重大项目(2018AAA004);绿色建筑材料国家重点实验室(中国建筑材料科学研究总院)开放基金(20181h0503)。
张秀贞1,2,刘志超1,2,3,王发洲1,2,商得辰4,5
1.武汉理工大学硅酸盐建筑材料国家重点实验室,430070;2.武汉理工大学材料科学与工程学院,430070;3.中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京 100024; 4.华新水泥股份有限公司,武汉 430073;5.华新新型建材(武汉

张秀贞1,2,刘志超1,2,3,王发洲1,2,商得辰4,5

张秀贞,刘志超,王发洲,等.超高性能混凝土的自收缩特性研究[J].混凝土与水泥制品,2019(7):13-16+22.

ZHANG X Z,LIU Z C,WANG F Z,et al.Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(7):13-16+22.

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摘 要:系统研究了不同引气剂掺量及类型对机制砂海工混凝土抗冻性能的影响,并通过气孔间距试验、电镜扫描等试验方法,分析了冻融环境下不同引气剂对机制砂海工混凝土的作用机理。试验结果表明,当ML类引气剂掺量为0.4%时,机制砂海工混凝土有较好的抗冻性能;醚类引气剂可进一步改善混凝土的工作性,其引入的微小气泡可以改善混凝土的包裹性,同时不影响混凝土的抗压强度;混凝土气泡间距系数、平均气孔弦长越小,其抗冻性能越好。 Abstract: The effects of different types and contents of air entraining agents and their dosages on the frost resistance of marine concrete with manufactured sand are systematically studied. The mechanism of action of different air entraining agents on marine concrete with manufactured sand under freeze-thaw environment is analyzed by means of pore spacing tests and SEM. The test results show that: when the content of domestic ether air entraining agent is 0.4%, the marine concrete with manufactured sand has better frost resistance. Ether air-entraining agent can further improve the performance of concrete than rosin air-entraining agent. The micro-bubbles introduced by ether air-entraining agent can improve the encapsulation of concrete without affecting the compressive strength of concrete. The smaller the spacing coefficient of air bubbles and the average chord length of pore, the better the frost resistance of concrete.
英文名 : Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete(UHPC)
刊期 : 2019年第7期
关键词 : 超高性能混凝土(UHPC);自收缩;钢纤维;水化
Key words : Ultra high performance concrete(UHPC); Autogenous shrinkage; Steel fiber; Hydration
刊期 : 2019年第7期
DOI : 10.19761/j.1000-4637.2019.07.001.04
文章编号 :
基金项目 : 国家重点研发计划(2017YFB0310000);国家自然科学基金(51702242);湖北省技术创新重大项目(2018AAA004);绿色建筑材料国家重点实验室(中国建筑材料科学研究总院)开放基金(20181h0503)。
作者 : 张秀贞1,2,刘志超1,2,3,王发洲1,2,商得辰4,5
单位 : 1.武汉理工大学硅酸盐建筑材料国家重点实验室,430070;2.武汉理工大学材料科学与工程学院,430070;3.中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京 100024; 4.华新水泥股份有限公司,武汉 430073;5.华新新型建材(武汉

张秀贞1,2,刘志超1,2,3,王发洲1,2,商得辰4,5

张秀贞,刘志超,王发洲,等.超高性能混凝土的自收缩特性研究[J].混凝土与水泥制品,2019(7):13-16+22.

ZHANG X Z,LIU Z C,WANG F Z,et al.Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(7):13-16+22.

摘要
参数
结论
参考文献
引用本文

摘   要:研究了不同钢纤维体积分数(0、2%、3.5%)的超高性能混凝土(UHPC)在密封养护条件下的线性收缩量、温度变化以及水化放热速率随时间的变化规律。结果表明,超高性能混凝土的自收缩过程可以分为四个阶段,分别由温度和湿度控制,且与温度变化以及水化放热数据匹配良好;钢纤维的掺入不改变收缩发展阶段也不改变各阶段的持续时间,但随着钢纤维掺量的提高,有效抑制了UHPC收缩发展程度;通过MANGAT&AZARI纤维收缩抑制模型模拟UHPC自收缩变化,与实测数据的匹配度良好。
Abstract:The linear shrinkage deformation, temperature and hydration release rate evolution in ultra-high performance concrete (UHPC) with different volume fractions of steel fibers(0, 2.0% and 3.5%)were studied. The results indicate that four distinct stages are identified on the shrinkage development profile governed by temperature and pore humidity, both of which possess good correlation to shrinkage strain. The addition of steel fibers does not alter the shrinkage pattern in UHPC and reduces shrinkage strain in proportion to the volume fraction of steel fibers. The MANGAT&AZARI model on shrinkage restraining effect is employed to calculate the shrinkage strain in steel fiber reinforced UHPC mixes, which demonstrates good match to the measured results.

关键词:
机制砂;海工混凝土;引气剂;抗压强度;质量损失率;相对动弹性模量
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(1)UHPC的收缩过程可分为四个阶段,分别为热收缩控制期,短暂的潜伏期,自干燥自收缩为主的加速期以及自干燥收缩为主的稳定期。
(2)钢纤维的引入不改变收缩的发展阶段或者持续时间,但对基体收缩量有明显抑制作用。
(3) MANGAT和AZARI 提出的纤维作用模型与钢纤维在UHPC中早期(20 h)的作用机理不同,并不能合理的预测该阶段的收缩,但是适用于后期的收缩阶段,与实际作用效果吻合度良好,可以用来指导实际工程应用。

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张秀贞,刘志超,王发洲,.超高性能混凝土的自收缩特性研究[J].混凝土与水泥制品,2019(7):13-16+22.

ZHANG X Z,LIU Z C,WANG F Z,et al.Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(7):13-16+22.

 

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