首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
矿物掺合料调控界面过渡区微结构对混凝土力学性能的影响
作者:吴凯1 施惠生1 徐玲琳1 高云2 叶光3 
单位:1. 同济大学材料科学与工程学院 上海 201804 2. 东南大学材料科学与工程学院 南京 211189 3. Faculty of Civil Engineering and Geosciences  TU Delft  2628 CN Delft  The Netherlands 
关键词:界面过渡区 力学性能 压汞 矿物掺合料 微结构 
分类号:TQ 172
出版年,卷(期):页码:2017,45(5):623-630
DOI:10.14062/j.issn.0454-5648.2017.05.04
摘要:

 系统测试了利用石灰石粉、矿粉及不同集料体积掺量、粒径分布配制试件的抗压强度与动弹模量,采用压汞法对相应试件孔径分布特征进行对比分析,研究掺合料对基体及界面过渡区(ITZ)孔结构的作用,分析掺合料调控ITZ微结构对混凝土力学性能的影响机理。结果表明:掺加5%石灰石粉可细化样品孔结构,使总孔隙率及10 nm以上孔的含量有所降低;掺加10%石灰石粉则会提高总孔隙率和10 ~100 nm孔体积,但降低100 nm以上孔的含量;掺加35%矿粉虽然减少了试件的总孔隙率及10 nm以上孔的含量,但会提高10 nm以下孔的体积;在大掺量矿粉时(70%),大于10 nm的毛细孔有所减少,而小于10 nm的微孔含量显著增加;掺加5%石灰石粉或35%矿粉,试件56 d抗压强度、动弹模量略有增加,且增加幅度随集料体积掺量增加或集料平均粒径的减小而增大;混凝土力学性能的改善主要取决于100 nm以上区间即界面过渡区孔结构的优化。

 

 The compressive strength and elastic modulus of concrete with slag, limestone powder, and aggregate were determined. The effect of the mineral admixture on the porosity features of cement matrix and interfacial transition zone (ITZ) was investigated, and the improved mechanism for the mechanical properties was analyzed from the ITZ microstructure point of view. The results show that 5% addition of limestone powder is able to refine the pore structure by reducing the total pore volume and the volume of pores of > 10 nm. Increasing the limestone powder replacement level to 10% can increase the total pore volume and the volume of pores between 10 and 100 nm, and reduce the volume of pores of > 100 nm. Replacing 35% of cement by slag can reduce the total porosity and the volume of pores of > 10 nm. However, the addition of large amount of slag (70%) can increase the volume of pores of < 10 nm, while the volume of pores of > 10 nm decreases. Moreover, 5% addition of limestone powder or 35% addition of slag increase the compressive strength and elastic modulus of samples cured after 56 d. This increment is more remarkable as the aggregate volume content increases or the mean aggregate size decreases. The modification of mechanical properties is more related to the variation of pores in the range of > 100 nm.

 
基金项目:
国家自然科学基金项目(51608382,51378390,51402216)。
作者简介:
吴 凯(1987—),男,博士,助理教授。
参考文献:

 [1] 孙伟, 缪昌文. 现代混凝土理论与技术[M]. 北京: 科学出版社, 2012: 579–634.

[2] 陈惠苏, 孙伟, Piet S. 水泥基复合材料集料与浆体界面研究综述(二): 界面微观结构的形成、劣化机理及其影响因素[J]. 硅酸盐学报, 2004, 32(1): 70–80.
CHEN Huisu, SUN Wei, Piet S. J Chin Ceram Soc, 2004, 32(1): 70–80.
[3] 陈惠苏, 孙伟, PIET S. 水泥基复合材料界面对材料宏观性能的影响[J]. 建筑材料学报, 2005, 8(1): 51–62.
CHEN Huisu, SUN Wei, Piet S. J Build Mater, 2005, 8(1): 51–62.
[4] Mitsui K, Li Z J, Lange D A, et al. Relationship between microstructure and mechanical properties of the paste-aggregate interface[J]. ACI Mater J, 1994, 91(1): 30–39.
[5] Ramesh G, Sotelino E D, Chen W F. Effect of transition zone on elastic moduli of concrete materials[J]. Cem Concr Res, 1996, 26(4): 611–622.
[6] Poon C S, Shui Z H, Lam L. Effect of microstructure of ITZ on compressive strength of concrete prepared with recycled aggregates[J]. Constr Build Mater, 2004, 18(6): 461–468.
[7] Zhang J X, Sun H H, Wan J H, et al. Study on microstructure and mechanical property of interfacial transition zone between limestone aggregate and Sialite paste[J]. Constr Build Mater, 2009, 23(11): 3393–3397.
[8] Ke Y, Ortola S, Beaucour A L, et al. Identification of microstructural characteristics in lightweight aggregate concretes by micromechanical modelling including the interfacial transition zone (ITZ)[J]. Cem Concr Res, 2010, 40(11): 1590–1600.
[9] Herve E, Care S, Seguin J P. Influence of the porosity gradient in cement paste matrix on the mechanical behavior of mortar[J]. Cem Concr Res, 2010, 40(7): 1060–1071.
[10] Larbi J. The Cement Paste-Aggregate lnteriacial Zone in Concrete[D]. TU Delft, Delft, The Netherlands, 1991.
[12] 杜修力, 揭鹏力, 金浏. 不同加载速率下界面过渡区对混凝土破坏模式的影响[J]. 水利学报, 2014, 45(S1): 19–23.
DU Xiuli, JIE Pengli, JIN Liu. J Hydraulic Eng (in Chinese), 2014, 45(S1): 19–23.
[13] AKCAOGLU T, TOKYAY M, CELIK T. Effect of coarse aggregate size and matrix quality on ITZ and failure behavior of concrete under uniaxial compression[J]. Cem Concr Comp, 2004, 26(6): 633–638.
[14] AKCAOGLU R, TOKYAY M, CELIK T. Assessing the ITZ microcracking via scanning electron microscope and its effect on the failure behavior of concrete[J]. Cem Concr Res, 2005, 35(2): 358–363.
[15] BENTZ D P, GARBOCZI E J. Simulation studies of the effects of mneral admixtures on the cement paste-aggregate interfacial zone[J]. ACI Mater J, 1991, 88(5): 518–529.
[16] OLLIVIER J P, MASO J C, BOURDETTE B. Interfacial transition zone in concrete[J]. Adv Cem Based Mater, 1995, 2(1): 30–38.
[17] LEEMANN A, MUNCH B, GASSER P, et al. Influence of compaction on the interfacial transition zone and the permeability of concrete[J]. Cem Concr Res, 2006, 36(8): 1425–1433.
[18] KURODA M, WATANABE T, TERASHI N. Increase of bond strength at interfacial transition zone by the use of fly ash[J]. Cem Concr Res, 2000, 30(2): 253–258.
[19] ASBRIDGE A H, PAGE C L, PAGE M M. Effects of metakaolin, water/binder ratio and interfacial transition zones on the microhardness of cement mortars[J]. Cem Concr Res, 2002, 32(9): 1365–1369.
[20] JIANG L H. The interfacial zone and bond strength between aggregates and cement pastes incorporating high volumes of fly ash[J]. Cem Concr Comp, 1999, 21(4): 313–316.
[21] XUAN D X, SHUI Z H, WU S P. Influence of silica fume on the interfacial bond between aggregate and matrix in near-surface layer of concrete[J]. Constr Build Mater, 2009, 23(7): 2631–2635.
[22] XIE P, BEAUDOIN J J. Modification of transition zone microstructure -silica fume coating of aggregate Surfaces[J]. Cem Concr Res, 1992, 22(4): 597–604.
[23] SIDDIQUE R. Utilization of silica fume in concrete: review of hardened properties[J]. Resour Conserv Recy, 2011, 55(11): 923–932.
[24] WINSLOW D N, COHEN M D, BENTZ D P, et al. Percolation and pore structure in mortars and concrete[J]. Cem Concr Res, 1994, 24(1): 25–37.
[25] HAMAMI A A, TURCRY P, MOKHTAR A. Influence of mix proportions on microstructure and gas permeability of cement pastes and mortars[J]. Cem Concr Res, 2012, 42(2): 490–498.
[26] WU K; SHI H S, XU L L, et al. Microstructural characterization of ITZ in blended cement concretes and its relation to transport properties[J]. Cem Concr Res, 2016, 79(1): 243–256.
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com