|Table of Contents|

Effect of Mineral Admixture on Early Age Cracking of Concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2006年04期
Page:
19-
Research Field:
Publishing date:
2006-12-20

Info

Title:
Effect of Mineral Admixture on Early Age Cracking of Concrete
Author(s):
GAO Xiao-jian;  BA Heng-jing;  YANG Ying-zi
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
Keywords:
concrete;  early age cracking;  mineral admixture;  autogenous shrinkage;  drying shrinkage;  creep
PACS:
TU528.041
DOI:
-
Abstract:
Early age cracking has been an ever-present problem during the application of high performance concrete. Influences of silica fume, fly-ash and ground granulated blast-furnace slag(GGBS)on early age cracking tendency of concrete were studied using the plate type concrete cracking frame, and autogenous shrinkage, total shrinkage of early age concrete under the drying condition were also measured in this experiment. The test results show that the addition of silica fume worsens the early age cracking of concrete, though it has little influence on the total shrinkage of early age concrete under drying condition. The addition of fly-ash reduces evidently the early age autogenous shrinkage of concrete and it doesn't decrease the total shrinkage of concrete. The addition of GGBS increases both autogenous shrinkage and total shrinkage of concrete at early ages. However, the addition of fly-ash or GGBS improves the early age cracking resistance of concrete, and fly-ash exceeds GGBS. As a result, the main reason of the lower cracking resistance of the silica fume concrete is that the addition of silica fume increases the elastic modulus and reduces the creep stress relaxation capability of concrete at early ages. The higher cracking resistance of the concrete added with fly-ash or GGBS is due to the lower elastic modulus and the better creep stress relaxation capability of concretes at early ages.

References:

[1] JENSEN A D,CHATTERJI S.State of the Art Report on Micro-cracking and Lifetime of Concrete:PartⅠ[J].Materials and Structures,1996,29(1):3-8.
[2]GUSE U,HILSDORF H K.Surface Cracking of High Strength Concrete[C]//WITTMANN F H,SCHWESINGER P.High Performance Concrete:Material Properties and Design.Freiburg:Aedificatio Verlag Gmbh,1995:69-89.
[3]WIEGRINK K,MARIKUNTE S,SHAH S P.Shrinkage Cracking of High-Strength Concrete[J].ACI Materials Journal,1996,93(5):409-415.
[4]梁文泉,王信刚,何 真,等.矿渣微粉掺量对混凝土收缩开裂的影响[J].武汉大学学报:工学版,2004,37(1):77-81. LIANG Wen-quan,WANG Xin-gang,HE Zhen,et al.Influence of GGBFS Content on Shrinkage Cracking of Concrete[J].Engineering Journal of Wuhan University,2004,37(1):77-81.
[5]RADOCEA A.Autogenous Volume Change of Concrete at Very Early Age[J].Magazine of Concrete Research,1998,50(2):107-109.
[6]贺拴海,吕颖钊.考虑材料耐久性的在役混凝土结构可靠度研究[J].建筑科学与工程学报,2005,22(1):71-75. HE Shuan-hai,LU Ying-zhao.Reliability Research of Existing Reinforced Concrete Structures[J].Journal of Architecture and Civil Engineering,2005,22(1):71-75.
[7]马玉平,马 昕,崔建涛.高强度混凝土试验研究[J].建筑科学与工程学报,2005,22(3):67-69. MA Yu-ping,MA Xin,CUI Jian-tao.Experimental Research on High-Strength Concrete[J].Journal of Architecture and Civil Engineering,2005,22(3):67-69.
[8]王大宏.自密实轻骨料高性能混凝土配合比优化设计[J].建筑科学与工程学报,2006,23(2):68-71. WANG Da-hong.Optimal Design of Mixing Ratio for Self-compacting Light-Aggregate High Performance Concrete[J].Journal of Architecture and Civil Engineering,2006,23(2):68-71.
[9]高小建,何忠茂,杨英姿,等.周边约束状态下板式混凝土早期开裂模式及收缩应变的分布[J].硅酸盐学报,2004,32(3):334-339. GAO Xiao-jian,HE Zhong-mao,YANG Ying-zi,et al.Distribution of Shrinkage Strain and Induced Cracks of a Round Restrained Concrete Plate at Early Age[J].Journal of the Chinese Ceramic Society,2004,32(3):334-339.
[10]高小建,巴恒静,祁景玉.混凝土水灰质量比与其早期收缩关系的研究[J].同济大学学报:自然科学版,2004,32(1):67-71. GAO Xiao-jian,BA Heng-jing,QI Jing-yu.Study on Relationship Between Water-Cement Mass Ratio and Early Age Shrinkage of Concrete[J].Journal of Tongji University:Natural Science,2004,32(1):67-71.
[11]SAHAH A A,DAVID A L.Creep,Shrinkage,and Cracking of Restrained Concrete at Early Age[J].ACI Materials Journal,2001,98(4):323-331.

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Last Update: 2006-12-20