硅酸盐学报

矿渣混合水泥中初始氧化钙含量与砂浆溶蚀质量损失的关系

作者：王培铭庞敏刘贤萍

单位：1. 同济大学材料科学与工程学院上海201804 2. 先进土木工程材料教育部重点实验室上海 201804

分类号：TU52

出版年,卷(期):页码：2016,44(5):1-6

DOI：10.14062/j.issn.0454-5648.2016.05.01

摘要：

?研究了不同养护龄期(28和180 d)的纯硅酸盐水泥和不同矿渣粉掺量(50%、70%和90%)的矿渣混合水泥砂浆在加速溶蚀条件下的溶蚀质量损失规律，分析了硅酸盐水泥和混合水泥初始CaO含量、浆体中氢氧化钙(CH)含量和水化程度，基于浆体中CH含量与水泥初始CaO含量，以及溶蚀质量损失之间的关系，探讨了水泥初始CaO含量与砂浆溶蚀质量损失之间的关联性，并阐述了水泥浆体水化程度的影响。结果表明：在溶蚀过程中，两个养护龄期下的砂浆溶蚀质量损失随溶蚀时间的增加而增加，矿渣粉的掺加有利于降低溶蚀质量损失，改善硅酸盐水泥的抗溶蚀性能；各水泥(硅酸盐水泥和矿渣混合水泥)初始CaO含量与溶蚀质量损失呈对数关系，水泥初始CaO含量低者，溶蚀质量损失较小，具有较好抗溶蚀性能；矿渣混合水泥水化程度与溶蚀质量损失亦存在一定的线性关系，水化程度较高时，溶蚀质量损失较大。

?The mass loss law of Portland cement and slag blended cement (with different slag content 50%, 70% and 90% , mass fraction) mortar with different ages (28 and 180 d) was investigated. Initial CaO content, CH content and hydration degree were analyzed, then the relation between calcium hydroxide(CH) content and cement initial CaO content as well as mass loss were discussed, finally the correlation of initial CaO content and mass loss was studied. The results showed that the mass loss of all the specimens increase with the increase of leaching time, and the addition of slag in blended cement can lower the leaching mass loss, and improve the corrosion resistance performance.The correlation of cement initial CaO content and leaching mass loss was logarithmic linear relationship. Initial CaO content of cementious material higher, the leaching mass loss greater, and its corrosion resistance performance get worse. And that the hydration degree of blended cement pastes also has a certain effect on leaching mass loss, there also has a certain liner correlation, the hydration degree of pastes higher, the leaching mass loss is greater.

基金项目：

国家“973”计划项目(2009CB623104)；国家自然科学基金(51102181)资助项目。

作者简介：

王培铭(1952—)，男，博士，教授。

参考文献：

[1] VAN EIJK R J, BROUWERS H J H. Study of the relation between hydrated Portland cement composition and leaching resistance[J]. Cem Concr Res, 1998, 28(6): 815–828.

[2] 刘仍光, 张波, 阎培渝. 软水溶蚀环境中水泥-矿渣复合胶凝材料的浆体结构变化[J]. 硅酸盐学报, 2013, 41(11): 1487–1491.

LIU Renguang, ZHANG Bo, YAN Peiyu. J Chin Ceram Soc(in Chinese), 2013, 41, 11: 1487–1491.

[3] PAN Feng, MIAO Changwen, BULLARD J W. A model of phase stability, microstructure and properties during leaching of Portland cement binders[J]. Cem Concr Compos, 2014, 49: 9–19.

[4] GARBOCZI E J, BENTZ D P. Computer simulation of the diffusivity of cement-based materials[J]. J Mater Sci, 1992, 27: 2083–2092.

[5] BENTZ D P, GARBOCZI E J. Modelling the leaching of calcium hydroxide from cement pastes: effects on pore space percolation and diffusivity[J]. Mater Struct, 1992, 25: 523–533.

[6] BENTZ D P, GARBOCZI E J. Advances in Cementitious Materials(Ceramic Transactions)[M]. From 2006 published by John Wiley Publishing Company ,Westerville Ohio(US), 1991: 211–226.

[7] CARDE C, FRANCOIS R, TORRENTINI J M. Leaching of both calcium hydroxide and C-S-H from cement pastes: Modeling the mechanical behavior[J]. Cem Concr Res, 1996, 26: 1257–1268.

[8] REVERTEGATE E, RICHET C, GEGOUT P. Effect of pH on the durability of cement pastes[J]. Cem Concr Res, 1992, 22: 259–272.

[9] FAUCON P, LEBESCOP P, ADENOT F, et al. Leaching of cement: Study of the surface layer[J]. Cem Concr Res, 1996, 26: 1707–1715.

[10] BUIL M, REVERTEGAT E, OLIVER J A. A model of the attack of pure water or undersaturated lime solutions on cement[C]//Stab. Soild. Hazard. Radioact. Wastes, 2nd Vol. STP 1123, ASTM, Philadelphia, US, 1992: 217–226.

[11] SEGURA I, MOLERO M, APARICIO S, et al. Decalcification of cement mortars: Characterization and modelling[J]. Cem Concr Compos, 2013, 35: 136–150.

[12] CARDE C, FRANCOIS R. Effect of the leching of calcium hydroxide from cement paste on mechanical and physical properties[J]. Cem Concr Res, 1997, 27: 539–550.

[13] CHEN J J, THOMAS J J, JENNINGS H M. Decalcification shrinkage of cement paste[J]. Cem Concr Res, 2006, 36: 801–809.

[14] YURTDAS I, XIE S Y, BURLION N, et al. Influence of chemical degradation on mechanical behavior of a petroleum cement paste[J]. Cem Concr Res, 2011, 41: 412–421.

[15] 杨虎, 蔡林华, 张研等. 基于溶蚀过程的混凝土化学损伤研究综述[J]. 水利水电科技进展, 2011, 31(1): 83–89.

YANG Hu, CAI Linhua, ZHANG Yan et al. Adv Sci Technol Water Resourc, 2011, 31(1): 83–89.

[16] LOTHENBACH B, SCRIVENER K, HOOTON R D. Supplementary cementitious materials[J]. Cem Concr Res, 2011, 41: 1244–1256.

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