采用具有粒子动态混合密实功能的SPACE系统,实现了高集料体积分数模型砂浆结构的生成.从而,以3种细集料粒径分布的模型砂浆(其中一种的粒径范围为0.125～1.34 mm,另外两种的粒径范围为0.25～5.00mm)结构为例,研究了集料细度和集料体积分数(ψ=40%～70%)对邻近集料表面最近间距分布的影响.结果表明,集料细度增加和集料体积分数增大都会使大尺度邻近集料表面最近间距出现的概率减小、小尺度邻近集料表面最近间距出现的概率增加,且峰值概率的位置向小间距方向偏移.另外,邻近集料表面最近间距的分区段累计概率结果分析表明,3种模型砂浆结构的邻近集料表面最近间距分布的57%以上小于10μm.最后,邻近集料表面最近间距的平均值的分析结果显示,当集料体积分数在40%～70%之间变化时,邻近集料表面最近间距的平均值在54.6～1.1μm之间变化;当砂浆中集料的体积分数在50%～70%之间变化时,邻近集料表面最近间距的平均值与集料的体积分数基本上呈线性关系;单位砂浆体积下集料的表面积的变化对邻近集料表面最近间距的平均值有影响,但二者之间的比值并非常数.
参考文献
| [1] | 吴中伟,廉慧珍.水泥基复合材料科学研究中的辩证思维[J].混凝土,2000(4):3-7.Wu Z W, Lian H Z. Dialectic ideology on scientific researches of cement based composites materials [J]. Concrete , 2000(4): 3-7. |
| [2] | 孙伟,严云.钢纤维高强水泥基复合材料的界面效应及其疲劳特性的研究[J].硅酸盐学报,1 994,22(2):107-116.Sun W, Yan Y. Study of the interfacial effect and fatigue behavior of steel fiber reinforced high strength cement based composites materials [J]. J Chin Ceram Soc, 1994, 22(2):107-116. |
| [3] | Beaudoin J J. Handbook of Fiber Reinforced Concrete: Prin ciples, Properties, Developments and Applications [M].Park Ridge: Noyes Publications, 1990. 85-86. |
| [4] | Diamond S, Mindess S, Lovell J. On the spacing between aggregate grains in concrete and the dimension of the aureole de transition [A]. In: Liaisons Pastes de Ciment /Materiaux Associates [C]. Toulouse: RILEM, 1982. C42-C46. |
| [5] | Koenders E A B. Simulation of volume changes in hardening cement-based materials [D]. Delft: Delft University of Technology, 1997. |
| [6] | 陈惠苏,孙伟,Stroeven P.计算混凝土中平均邻近集料表面最近间距的正十二面体模型[J].硅酸盐学报,2003,31(11):1048-1052.Chen H S, Sun W, Stroeven P. Regular dodecahedron model to calculate the average surface spacing between the nearest neighboring aggregate grains in concrete [J]. J Chin Ceram Soc, 2003, 31(11): 1048-1052. |
| [7] | 陈惠苏,孙伟,Stroeven P,等.计算混凝土中邻近集料表面间距平均值的体视学方法[J].哈尔滨工业大学学报,2005(排印中).Chen H S, Sun W, Stroeven P, etal. Calculation of the average value of surface spacing between the neighboring aggregate grains in concrete by stereological method [J]. Journal of Harbin Institute of Technology, 2005 (in press). |
| [8] | van Breugel K. Simulation of hydration and formation of structure in hardening cement-based materials [D]. Delft:Delft University Press, 1997. 198-256. |
| [9] | Navi P, Pignat C. Three dimensional characterization of the pore structure of a simulated cement paste [J]. Cem Concr Res, 1999, 29(4): 507-514. |
| [10] | Barker G C. Computer simulations of granular materials [A]. In: Metha A, ed. Granular Matter: An Interdisciplinary Approach [M]. New York: Springer Verlag, 1994. 35-83. |
| [11] | Nawy EG. Fundamentals of High Performance Concrete [M]. Second edition. New York: John Wiley & Sons, Inc,2001. 14. |
| [12] | Stroeven M. Discrete numerical modelling of composite materials [D]. Delft: Delft University of Technology, 1999. 224. |
| [13] | 陈惠苏,孙伟,Stroeven P,等.混凝土中邻近集料表面最近间距分布的计算机模拟[J].硅酸盐学报,2004,32(4):422-427.Chen H S, Sun W, Stroeven P, et al. Computer simulation of the nearest surface distance distribution between neighboring aggregate grains in concrete [J]. J Chin Ceram Soc,2004, 32(4): 422-427. |
| [14] | 陈惠苏.水泥基复合材料集料-浆体界面过渡区微观结构的计算机模拟及相关问题研究[D].南京:东南大学,2003.Chen H S. Computer simulation of the microstructure of in terfacial transition zone between aggregate and cement paste in cementitious composites and investigation of related issues [D]. Nanjing: Southeast University, 2003. |
| [15] | Neville A M. Properties of Concrete [M]. Fourth edition.London: Longman Group Limited, 1996. 167. |
| [16] | 交通部公路科学研究所.公路水泥混凝土路面施工技术规范(JTG F30-2003)[S].北京:人民交通出版社,2003.Research Institute of Highway, Ministry of Communications of the People's Republic of China. Technical specification for construction of highway cement concrete pavements (JTG F30-2003) [S]. Beijing: China Communications Press,2003. |
| [17] | Diamond S, Huang J. The interfacial transition zone: Reality or myth? [A]. In: Katz A, Bentur A, Alexander M, et al,eds. The Interfacial Transition Zone in Cementitious Composites, RILEM Proceedings 35 [C]. London: E&FN SPON, 1998. 3-39. |
| [18] | Diamond S. Percolation due to overlapping ITZs in laboratory mortars? A microstructural evaluation [J]. Cem Concr Res,2003, 33(7): 949-955. |
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