Effect of pulverized fuel ashes on autogenous shrinkage and compressive strength of cement pastes

被引：0
|
作者：
Hao C.-W. [1 ,2 ]
Deng M. [1 ]
Mo L.-W. [1 ]
Liu K.-W. [1 ]
机构：
[1] State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology
[2] Department of Architecture and Civil Engineering, West Anhui University
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2011年 / 14卷 / 06期
关键词：
Compressive strength; Pore structure; Pozzolanic reaction; Pulverized fuel ash;
D O I：
10.3969/j.issn.1007-9629.2011.06.005
中图分类号：
学科分类号：
摘要：
Autogenous shrinkage of cement pastes with different contents of pulverized fuel ashes (PFA) and different water-to-binder ratio were measured by a shrinkage test device. Compressive strength of sealed cement paste were also measured. The influence of PFA on the pore structures and micrograph of hydration products were investigated through mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM), on which the influence mechanism was analyzed. Experimental results demonstrated that autogenous shrinkage of cement pastes decreased with the increased contents of PFA at early age (before 7d), this may be ascribed to inhibition of PFA on the shrinkage. After 7d, however, both autogenous shrinkage, and compressive strength of cement pastes increased. This may be attributed to decrease of pore radius and densification of cement hydration products due to the pozzolanic reaction of fly ash.
引用
收藏
页码：746 / 751
页数：5
相关论文
共 19 条
  • [1] Jensen O.M., Hansen P.F., Autogenous deformation and RH-change in perspective, Cement and Concrete Research, 31, 12, pp. 1859-1865, (2001)
  • [2] Ba H.-J., Gao X.-J., Yang Y.-Z., Research on measuring of autogenous shrinkage of high performance concrete at early age, Industrial Construction, 33, 8, pp. 1-4, (2003)
  • [3] An M.-Z., Zhu J.-Q., Qin W.-Z., Autogenous shrinkage of high performance concrete, Journal of Building Materials, 4, 2, pp. 159-165, (2001)
  • [4] Liu J.-Z., Sun W., Miao C.-W., Et al., Effect of mineral admixtures on drying and autogenous shrinkage of concrete with low water-to-binder ratio, Journal of Southeast University: Natural Science, 39, 3, pp. 580-585, (2009)
  • [5] Tangtermsirkul S., Effect of chemical composition and particle size of fly ash on autogenous shrinkage of paste, Proceedings of the International Workshop on Autogenous Shrinkage of Concrete, pp. 175-186, (1998)
  • [6] Wang K., Shah S.P., Phuaksuk P., Plastic shrinkage cracking in concrete materials-influence of fly ash and fibers, ACI Material Journal, 98, 6, pp. 458-464, (2001)
  • [7] Termkhajornkit P., Nawa T., Nakai M., Et al., Effect of fly ash on autogenous shrinkage, Cement and Concrete Research, 35, 3, pp. 473-482, (2005)
  • [8] Li Y., Bao J.-L., Guo Y.-L., The relationship between autogenous shrinkage and pore structure of cement paste with mineral admixtures, Construction and Building Materials, 10, 24, pp. 1855-1860, (2010)
  • [9] Meddah M.S., Tagnit-Hamou A., Pore structure of concrete with mineral admixtures and its effect on self-desiccation shrinkage, ACI Materials Journal, 106, 3, pp. 241-250, (2009)
  • [10] Li X., Yan P.-Y., A R.-H., Assessment method of hydration degree of cement in complex binder based on the calcium hydroxide content, Journal of the Chinese Ceramic Society, 37, 10, pp. 1597-1601, (2009)
12