苏州混凝土水泥制品研究院有限公司

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超低水胶比及硅灰对水泥净浆早期自收缩的影响
Influence of Very Low W/B and Silica Fume on Early Autogenous Shrinkage of Cement Paste
2016年第4期
超低水胶比;硅灰;自收缩;毛细负压;水化程度
Very low W/B; Silica fume; Autogenous shrinkage; Capillary pressure; Hydration degree
2016年第4期
1000-4637(2016)04-01-04
国家自然科学基金项目(51438003)
葛晓丽1,刘加平1,2,3,王育江3,田 倩3,杨 斌3
1.重庆大学材料科学与工程学院,400045;2. 东南大学材料科学与工程学院,南京 210096; 3.江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京210008

葛晓丽1,刘加平1,2,3,王育江3,田 倩3,杨 斌3

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摘 要:采用自行研制的波纹管测试系统,测试超低水胶比水泥净浆的早期自收缩;并通过测试毛细管负压和水化程度,对自收缩结果进行分析,定性阐述超低水胶比水泥净浆的自收缩机理及规律。结果表明,当水胶比低于0.18时,水泥净浆的自收缩随水胶比的减小而降低;反之则增加;当水胶比为0.18(临界水胶比)时,水泥净浆的自收缩最大。硅灰可以很好地抑制超低水胶比水泥净浆的自收缩,当水胶比为0.15,硅灰掺量为5%和10%时,水泥基材料48h的自收缩分别降低了25.8%和56.3%。 Abstract: Early autogenous shrinkage of cement paste with very low W/B was measured with self-designed corrugated tubes. According to the capillary pressure and hydration progress, the early autogenous shrinkage was analyzed. Meanwhile, mechanism of early autogenous shrinkage was qualitatively presented. The results show that the autogenous shrinkage of cement paste decreases with the reducing of W/B in the case of W/B≤0.18, while a contrary tendency is presented when W/B is over 0.18; a critical W/B of 0.18 is observed in which autogenous shrinkage of cement paste would reach maximum. Silica fume is effective to restrain the early autogenous shrinkage of cement paste with very low W/B. When the W/B is 0.15 and the contents of silica fume are 5% and 10%, the autogenous shrinkage would decrease by 25.8% and 56.3% after 48h.
英文名 : Influence of Very Low W/B and Silica Fume on Early Autogenous Shrinkage of Cement Paste
刊期 : 2016年第4期
关键词 : 超低水胶比;硅灰;自收缩;毛细负压;水化程度
Key words : Very low W/B; Silica fume; Autogenous shrinkage; Capillary pressure; Hydration degree
刊期 : 2016年第4期
DOI :
文章编号 : 1000-4637(2016)04-01-04
基金项目 : 国家自然科学基金项目(51438003)
作者 : 葛晓丽1,刘加平1,2,3,王育江3,田 倩3,杨 斌3
单位 : 1.重庆大学材料科学与工程学院,400045;2. 东南大学材料科学与工程学院,南京 210096; 3.江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京210008

葛晓丽1,刘加平1,2,3,王育江3,田 倩3,杨 斌3

摘要
参数
结论
参考文献
引用本文

摘   要:采用自行研制的波纹管测试系统,测试超低水胶比水泥净浆的早期自收缩;并通过测试毛细管负压和水化程度,对自收缩结果进行分析,定性阐述超低水胶比水泥净浆的自收缩机理及规律。结果表明,当水胶比低于0.18时,水泥净浆的自收缩随水胶比的减小而降低;反之则增加;当水胶比为0.18(临界水胶比)时,水泥净浆的自收缩最大。硅灰可以很好地抑制超低水胶比水泥净浆的自收缩,当水胶比为0.15,硅灰掺量为5%和10%时,水泥基材料48h的自收缩分别降低了25.8%和56.3%。

Abstract: Early autogenous shrinkage of cement paste with very low W/B was measured with self-designed corrugated tubes. According to the capillary pressure and hydration progress, the early autogenous shrinkage was analyzed. Meanwhile, mechanism of early autogenous shrinkage was qualitatively presented. The results show that the autogenous shrinkage of cement paste decreases with the reducing of W/B in the case of W/B≤0.18, while a contrary tendency is presented when W/B is over 0.18; a critical W/B of 0.18 is observed in which autogenous shrinkage of cement paste would reach maximum. Silica fume is effective to restrain the early autogenous shrinkage of cement paste with very low W/B. When the W/B is 0.15 and the contents of silica fume are 5% and 10%, the autogenous shrinkage would decrease by 25.8% and 56.3% after 48h.

关键词:
超低水胶比;硅灰;自收缩;毛细负压;水化程度
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(1)水胶比对超低水胶比水泥净浆早期自收缩的影响存在临界值,临界水胶比为0.18。大于临界水胶比时,水泥净浆的自收缩随水胶比的增大而降低;小于临界水胶比时,水泥净浆的自收缩随水胶比的降低而降低;等于临界水胶比时,水泥净浆自收缩最大,其48h的自收缩可高达3248μm/m。
(2)硅灰可有效抑制水胶比为0.15的水泥净浆的早期自收缩,且掺量越高抑制作用越大,5%和10%的硅灰可使48h自收缩分别降低25.8%和56.3%。
(3)在水泥净浆水化初期,水胶比主要通过影响水化程度和早期毛细负压来影响自收缩。硅灰对超低水胶比水泥净浆早期自收缩的影响机理尚不十分明确,真正的原因还有待进一步研究。
[1] YU R, SPIESZ P, BROUWERS H J H. Mix design and properties assessment of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) [J]. Cement and Concrete Research, 2014,56:29-39.
[2] Person. Experimental studies on shrinkage of high-performance concrete[J]. Cement and Concrete Research,1998,28(7):1023-1036.
[3] ZHANG M H, TAM C T, LEOW M P. Effect of water-to-cementitious materials ratio and silica fume on the autogenous shrinkage of concrete [J]. Cement and Concrete Research, 2003, 33(10):1687-1694.
[4] BAROGHEL-BOUNY V, MOUNANGA P, KHELIDJ A, et al. Autogenous deformations of cement pastes: Part II. W/C effects, micro-macro correlations, and threshold values [J]. Cement and Concrete Research,2006,36(1):123-136.
[5] 安明喆,朱金铨,覃维祖. 高性能混凝土的自收缩问题[J]. 建筑材料学报,2001(2):159-166.
[6] 王冲,王勇威,蒲心诚,等. 超低水胶比水泥混凝土的自收缩特性及其机理[J].建筑材料学报,2010,13(1):75-79.
[7] STAQUET Stéphanie, ESPION B. Early-age autogenous shrinkage of UHPC incorporating very fine ash or metakaolin in replacement of silica fume[A]. Proceeding of the International Symposium on Ultra High Performance Concrete[C].Kassel, Germany: Kassel University Press,2004:586-598.
[8] 田倩, MEJLHEDE J O. 采用波纹管测试水泥基材料早期自收缩方法[J].硅酸盐学报,2009,37(1):39-45.
[9] 缪昌文,田倩,刘加平,等. 基于毛细管负压技术测试混凝土最早期的自干燥效应[J]. 硅酸盐学报,2007,35(4):509-516.
[10] 黄成毅. 高活性混合材-硅灰[J]. 硅酸盐通报,1987(6): 39-45.
[11] RONG Z D, SUN W, XIAO H J, et al. Effect of silica fume and fly ash on hydration and microstructure evolution of cement based composites at low water–binder ratios [J]. Construction and Building Materials, 2014, 51: 446-450.
[12] MAZLOOM M, RAMEZANIANPOUR A A, BROOKS J J. Effect of silica fume on mechanical properties of high-strength concrete[J]. Cement and Concrete Composites, 2004,26(4):347-357.
[13] Rozière E, Loukili A, El Hachem R, et al. Durability of concrete exposed to leaching and external sulphate attacks[J]. Cement and Concrete Research, 2009, 39(12): 1188-1198.
[14] 邓爽. 超高性能混凝土的微观特征——应用统计纳米压痕技术表征[J]. 凯里学院学报,2014,32(6):109-112.

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