Causes of Early-Age Thermal Cracking of Concrete Foundation Slabs and their Reinforcement to Control the Cracking

Slovak Journal of Civil Engineering

Juraj Bilčík¹  Natália Gažovičová²  Róbert Sonnenschein² 

[1] Corresponding authorDepartment of Concrete Structures and Bridges, Slovak University of Technology, Bratislava, Slovakia;Department of Concrete Structures and Bridges, Slovak University of Technology, Bratislava, SlovakiaOther articles by this author:

关键词: Watertight concrete;    Foundation slab;    Restrained contractions;    Early-age cracking;    Reinforcement;   

DOI  :  10.1515/sjce-2017-0013

学科分类：建筑学

来源: Slovenska Technicka Univerzita v Bratislave * Stavebna Fakulta

【 摘 要 】

This paper focuses on the causes and consequences of early-age cracking of mass concrete foundation slabs due to restrained volume changes. Considering the importance of water leaking through cracks in terms of the serviceability, durability and environmental impact of watertight concrete structures, emphasis is placed on the effect of temperature loads on foundation slabs. Foundation slabs are usually restrained to some degree externally or internally. To evaluate the effect of external restraints on foundation slabs, friction and interaction models are introduced. The reinforcement of concrete cannot prevent the initiation of cracking, but when cracking has occurred, it may act to reduce the spacing and width of cracks. According to EN 1992-1-1, results of calculating crack widths with local variations included in National Annexes (NAs) vary considerably. A comparison of the required reinforcement areas according to different NAs is presented.

【 授权许可】

Unknown