2013, Volume 15, Issue 4
Strategic Study of CAE >> 2013, Volume 15, Issue 4
Concrete crack and control
1. School of Materials Science and Engineering, Southeast University, Nanjing 210096, China;
2. State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 210008, China
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Abstract
Concrete cracking is a very popular problem throughout the civil engineering construction. In this paper, the harms and causes of concrete crack were analyzed first. Thereafter, new strategies for control cracking were proposed. An amphiphilic monolayer was introduced to reduce the evaporation rate and inhibit plastic shrinkage cracking of early-age concrete. A new chemical admixture with combined effect of water reduction and shrinkage reduction was developed for decreasing cracking risk of shell structure as well as thin-walled structure. Based on the regulation of early age hydration of cement, a new technology was introduced for impro-ving temperature control effect of mass concrete. At last, a telechelic toughening material was also recommended to improve the toughness of concrete and thus reduce its brittleness.
Keywords
concrete ; crack ; shrinkage ; hydration heat ; toughness
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References
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