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养护条件对水泥基材料孔隙结构的影响

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Abstract:

通过压汞法测量孔隙分布、孔隙率和体积、特征孔隙尺寸、孔隙比表面积和曲折度,研究了养护条件对密封养护净浆和砂浆试件的孔隙结构的影响。结果表明密封养护对水泥基材料的比表面作用较小,但是能显著提高其孔隙率;密封养护加剧自干燥作用,导致水泥基材料在10~100nm和100~1000nm区间出现明显的孔隙分布峰,且峰强和最可几尺寸均随着水灰比的增加而增加;密封养护导致水泥基材料的临界孔隙尺寸减小但是对平均孔径均影响较小;净浆和砂浆的退汞残余和曲折度均随着水灰比的增加而降低,且曲折度与孔隙率的关系大致符合指数规律。密封养护条件下自干燥导致微结构变化的模型表明水泥基材料在低含水量条件下水化不充分,孔隙压力大,容易出现连通的大毛细孔和微裂纹;水灰比越大,该现象越明显。

References

[1]  ? Giesche H. Mercury porosimetry: A general (practical) overview [J]. Part Part Syst Charact, 2006, 23: 9–19.
[2]  ? Diamond S. Mercury porosimetry: an inappropriate method for the measurement of pore size distributions in cement-based materials [J]. Cem Concr Res, 2000(30): 1517–25.
[3]  ? LEóN Y, LEóN C A. New perspectives in mercury porosimetry [J]. Adv Colloid Interface Sci, 1998, 76–77: 341–72.
[4]  ? Kaufmann J P, Loser R, Leemann A. Analysis of cement-based materials by multi-cycle mercury intrusion and nitrogen sorption [J]. J Colloid Interface Sci, 2009, 336: 730–737.
[5]  ? ZENG Q, LI K, FEN-CHONG T, et al. Analysis of pore structure, contact angle and pore entrapment of blendedcement pastes from mer- cury porosimetry data [J]. Cem Cocr Compos, 2012, 34: 1053–1060.
[6]  ? ZENG Q, LI K, FEN-CHONG T, et al. Pore structure characterization of cement paste blended with high-volume fly-ash [J]. Cem Concr Res, 2012, 42: 194–204.
[7]  ? Metha P K, Monteiro P J M. Concrete microstructure, properties, and materials [M]. 3rd ed. New York: NY McGraw-Hill, 2005: 15–17.
[8]  ? Bentz D, Stutzman P E. Curing, hydration, and microstructure of cement paste [J]. ACI Mater J, 2006, 103(5): 348–356.
[9]  ? 蒋正武, 孙振平, 王培铭, 等. 高性能混凝土中自干燥效应的研究[J]. 建筑材料学报, 2004, 7(1): 19–24.
[10]  JIANG Zhengwu, SUN Zhenping, WANG Peiming, et, al. J Build Mater (in Chinese), 2004, 7(1): 19–24.
[11]  ? 高原, 张君, 韩宇栋. 混凝土超早期收缩试验与模拟[J]. 硅酸盐学报, 2012, 40(8): 1088–1094.
[12]  GAO Yuan, ZHANG Jun, HAN Yudong. J Chin Ceram Soc, 2012, 40(8): 1088–1094.
[13]  ? Aligizaki K K. Pore Structure of Cement-based Materials: Testing, Interpretation and Requirement [M]. New York: Taylor & Francis, 2006: 35–40.
[14]  ? Abbas A, Carcasses M, Yssorche-Cubaynes M P. Permeability of mortars and the degree of saturation [R]. Rencontre Internationale de Toulouse, 1998.
[15]  ? Jennings H M. Refinements to colloid model of C–S–H in cement: CM-II [J]. Cem Concr Res, 2008(38): 275–289.
[16]  ? Hamami A A, Turcry P, Ait-Mokhtar A. Influence of mix proportions on microstructure and gas permeability of cement pastes and mortars [J]. Cem Concr Res, 2012, 42: 490–498.
[17]  ? Androutsopoulos G P, Salmas C E. Tomography of macro– meso-pore structure based on mercury porosimetry hysteresis [J]. Chem Eng Comm, 2000, 181: 137–177.
[18]  ? Archie G E. The electrical resistivity log as an aid to determining some reservoir characteristics [J]. AIME Trans, 1942, 146: 54–62.
[19]  

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