[1]刘琳,孙伟,陈惠苏,等.饱和状态下水泥浆体的微观结构冰冻损伤模型[J].东南大学学报(自然科学版),2011,41(5):1059-1064.[doi:10.3969/j.issn.1001-0505.2011.05.031]
 Liu Lin,Sun Wei,Chen Huisu,et al.Microstructure-based modeling of frost damage of saturated cement paste[J].Journal of Southeast University (Natural Science Edition),2011,41(5):1059-1064.[doi:10.3969/j.issn.1001-0505.2011.05.031]
点击复制

饱和状态下水泥浆体的微观结构冰冻损伤模型()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
41
期数:
2011年第5期
页码:
1059-1064
栏目:
材料科学与工程
出版日期:
2011-09-20

文章信息/Info

Title:
Microstructure-based modeling of frost damage of saturated cement paste
作者:
刘琳123孙伟12陈惠苏12叶光3钱智炜3
(1东南大学材料科学与工程学院,南京211189)(2东南大学江苏省土木工程材料重点实验室,南京211189)(3荷兰代尔夫特理工大学土木与地球科学学院微观材料实验室,Delft 2628CN)
Author(s):
Liu Lin123Sun Wei12Chen Huisu12Ye Guang3Qian Zhiwei3
(1 School of Material Science and Engineering, Southeast University, Nanjing 211189, China)
(2 Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China)
(3 Microlab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft 2628CN, The Netherlands)
关键词:
饱水水泥浆体微观结构冰冻破坏三维格构结构
Keywords:
saturated cement paste microstructure frost damage three-dimensional lattice structure
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2011.05.031
摘要:
为了研究水转化为冰所带来的体积膨胀对水泥浆体的微观结构的危害,量化微观结构的内部损伤,建立了一个饱水状态下水泥浆体的冰冻破坏模型.首先使用模拟水泥浆体微观结构的数值模型(HYMOSTRUC)生成一个模拟结构,根据这个模拟结构中的孔结构,分析水分在孔隙中发生的相转变; 将含有冰、水和水化产物的水泥浆体微观模拟结构转变为三维格构结构,并把水分发生相变时产生的体积膨胀引入其中,从而分析格构结构的受力及断裂; 最后得到水泥浆体微结构内部微裂缝的分布.该模型真实反映了冰冻作用对微观结构的破坏,模拟结果显示微裂缝产生在由水转变为冰的孔隙周围的抗拉强度低的固相水化产物中.
Abstract:
In order to investigate the microstructural change of cement paste caused by the volume expansion of water-to-ice change and to quantify the internal damage of the microstructure, a numerical frost damage model of saturated cement paste is proposed. A virtual microstructure of cement paste is first obtained by use of a numerical model namely HYMOSTRUC(hydration, morphology and structure). Then according to the pore structure of the virtual microstructure of cement paste, the phase change of water in pores is analyzed. The next is to convert the microstructure of cement paste containing ice, water and hydration products into a three-dimensional (3D) lattice structure. The volumetric expansion of water-to-ice is imposed in the 3D lattice structure. Thus the fracturing process of the 3D lattice structure is obtained and the distribution of micro-cracks in the microstructure of cement paste is revealed. The modeling shows that the micro-cracks occur in the hydration products of low tensile strength around the pores filled with ice.

参考文献/References:

[1] Metha P K,Monteiro P J M.Concrete:microstructure,properties and materials [M].3rd ed.New York:McGraw-Hill,2006.
[2] Scherer G W.Crystallization in pores [J].Cement and Concrete Research,1999,29(8):1347-1358.
[3] Scherer G W,Valenza J.Mechanisms of frost damage [C]//Materials Science of Concrete.Westerville,OH,USA,2005:209-246.
[4] Setzer M J.Micro-ice-lens formation in porous solid [J].Journal of Colloid and Interface Science,2001,243(1):193-201.
[5] Liu L,Ye G,Schlangen E,et al.Modeling the internal damage of saturated cement paste due to ice crystallization exposed to low temperature [J].Cement and Concrete Composites,2011,33(5):562-571.
[6] Promentilla M A B,Sugiyama T,Hitomi T,et al.Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography[J].Cement and Concrete Research,2009,39(6):548-557.
[7] Trtik P,Münch B,Lura P.A critical examination of statistical nanoindentation on model materials and hardened cement pastes based on virtual experiments [J].Cement and Concrete Composites,2009,31(10):705-714.
[8] van Breugel K.Simulation of hydration and formation of structure in hardening cement-based materials [D].Delft,The Netherlands:Faculty of Civil Engineering and Geosciences,Delft University of Technology,1991.
[9] Chen H S,Stroeven P,Ye G,et al.Influence of boundary conditions on pore percolation in model cement paste [J].Key Engineering Materials,2006,302/303:486-492.
[10] Ye G.Experimental study and numerical simulation of the development of the microstructure and permeability of cementitious materials [D].Delft,The Netherlands:Faculty of Civil Engineering and Geosciences,Delft University of Technology,2003.
[11] Bentz D P,Garboczi E J.Percolation of phases in a three-dimensional cement paste microstructure model [J].Cement and Concrete Research,1991,21(2/3):325-344.
[12] Bishnoi S,Schrivener K L.A new platform for modeling the hydration of cements [J].Cement and Concrete Research,2009,39(4):266-274.
[13] Stauffer D.Introduction to percolation theory [M].London:Taylor and Francis,1985.
[14] Tan L.Failure mechanisms in hydrating cement particle systems [D].Delft,The Netherlands:Faculty of Civil Engineering and Geosciences,Delft University of Technology,2007.
[15] Qian Z,Schlangen E,Ye G,et al.Prediction of mechanical properties of cement paste at microscale [J].Materiales de Construccion,2010,60(297):7-18.
[16] Schlangen E.Experimental and numerical analysis of fracture processes in concrete [D].Delft,The Netherlands:Faculty of Civil Engineering and Geosciences,Delft University of Technology,1993.
[17] Bolander J E,Sukumar N.Irregular lattice model for quasistatic crack propagation [J].Physical Review B,2005,71(9):094106-1-094106-12.
[18] Manzano H,Dolado J S,Ayuela A.Elastic properties of the main species present in Portland cement pastes [J].Acta Materialia,2009,57(5):1666-1674.
[19] Qian Z,Ye G,Schlangen E,et al.3D lattice fracture model:application to cement paste at microscale [J].Key Engineering Materials,2011,452/453:65-68.
[20] Sanahuja J,Dormieux L,Chanvillard G.Modeling elasticity of a hydrating cement paste [J].Cement and Concrete Research, 2007,37(1):1427-1439.
[21] Petrovic J J.Review mechanical properties of ice and snow [J].Journal of Materials Science,2003,38(1):1-6.

备注/Memo

备注/Memo:
作者简介:刘琳(1983—),女,博士生;孙伟(联系人),女,教授,博士生导师,中国工程院院士,sunwei@seu.edu.cn.
基金项目:国家重点基础研究发展计划(973计划)资助项目( 2009CB623203)、国家自然科学基金资助项目(50708018).
引文格式: 刘琳,孙伟,陈惠苏,等.饱和状态下水泥浆体的微观结构冰冻损伤模型[J].东南大学学报:自然科学版,2011,41(5):1059-1064.[doi:10.3969/j.issn.1001-0505.2011.05.031]
更新日期/Last Update: 2011-09-20