全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

水泥水化过程的细观力学模型与性能演化

, PP. 117-123

Keywords: 水泥,水化,细观结构,性能演化,均匀化方法

Full-Text   Cite this paper   Add to My Lib

Abstract:

基于水泥水化过程的实验测量数据,建立了一个研究水泥水化过程的细观结构和有效性能演化的细观力学模型。该模型由未水化的水泥颗粒、水泥凝胶和孔洞三相介质组成,并假设细观结构呈周期性均匀分布。随着水化过程的进行,模型中的组份是连续变化的,并与实验测量的组份含量完全一致。利用本文中模型和均匀化方法(直接平均法和二尺度展开法)计算了水泥浆体在各瞬时的杨氏模量和泊松比。研究表明,在水泥的水化过程中,水泥浆体的弹性性能随水化度而变化,其变化规律和精度与现有的实验数据符合很好。该方法可容易地推广到三维情况和其他水化介质。

References

[1]   Taylor H F W, Newbury D E. Elect ron microprobe study of amature cement paste [J] . Cem Concr Res , 1984 , 14 (4) : 565- 573.
[2]   Bentz D P , Garboczi E J . Digital-image-based computer modeling of cement-based materials [A] . In : J D Frost , J R Wright ,eds. Digital Image Processing : Techniques and Application inCivil Engineering [C] . New York : ASCE , 1993. 63 - 74.
[3]   J ennings H M , Johnson S K. Simulation of microst ructuredevelopment during t he hydration of a cement compound [J] .J A m Ceram S oc , 1986 , 69 (11) : 790 - 795.
[4]   van Breugel K. Simulation of hydration and formation of st ructure in hardening cement based materials [D] . Delft : DelftUniversity of Technology , 1991.
[5]   Koenders E A B , van Breugel K. Numerical modeling of autogenous shrinkage of hardening cement paste [J] . Cem ConcrRes , 1997 , 27 (10) : 1489 - 1499.
[6]   Lokhorst S J . Deformational behavior of concrete influenced byhydration related changes of microst ructure
[7]  [R] . Delft : DelftUniversity of Technology , 1998.
[8]   Ye G, Lura P , van Breugel K, Fraaij A L A. Three-dimensional microst ructure analysis of numerically simulated at cementitious materials [J] . Cem Concr Res , 2003 ,33(2) :215 - 222.
[9]   Powers T C , Brownyard T L. Studies of t he Physical Properties Hardened Portland Cement Paste (Part Ⅸ) [M] . Chicago :Portland Cement Association , 1948. 109 - 992.
[10]   Lokhorst S J , van Breugel K. Simulation of t he effect of geomet rical changes of t he microst ructure on t he deformational behavior of hardening concrete [J] . Cem Concr Res , 1997 , 27(10) : 1465 - 1479.
[11]  Igarashi S , Kawamura M , Watanabe A. Analysis of cementpastes and mortars by a combination of backscatter-based SEMimage analysis and calculations based on the Powers model [J] .Cem Concr Compos , 2004 , 26 (8) : 977 - 985.
[12]  Yang Q S , Becker W. A comparative investigation of differenthomogenization met hods for prediction of t he macroscopicproperties of composites [J] . Computer Model ing in Engineering & Sciences , 2004 , 6 (4) : 319 - 332.
[13]  Bensoussan A , Lion J L , Papanicolaou G. Asymptotic Analysis for Periodic St ructures [M] . Amsterdam: Nort h-Holland ,1978.
[14]  Sanchez-Palencia E. Non-homogeneous media and vibrationt heory[A] . Lecture Notes in Physics [M] . Berlin : SpringerVerlag , 1980 ,127.
[15]  Paulini P , Bilewicz D. Temperature field and concrete st ressesin a foundation plate [A] . In : Proceedings of InternationalRIL EM Symposium: Thermal Cracking in Concrete at EarlyAges [C]. Munich :RILEM Technical Committee ,1994. 337 - 344.
[16]  Siders K K, Manitia P , Sideris K. Estimation of ultimate modulusof elasticity and Poisson ratio of normal concrete [J] . CemConcr Compos , 2004 , 26 (6) : 623 - 631.
[17]  Pribcigallo A , Lura P , van Breugel K. Early development ofproperties in a cement paste : A numerical and experimentalstudy [J] . Cem Concr Res , 2003 , 33 (7) : 1013 - 1020.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133