Abstract
Abstract: The concrete as a porous cement-based material is widely used in practice. The analysis of the basic reason why the drying shrinkage stress develops in concrete at early age is made by using the principal of the equilibrium between capillary water repulsive force and molecular attracting force. The model for computing the drying shrinkage stress for nonbinding concrete is presented by relating the capillary water pressure to relative humidity. Based on it ,the model for concrete fully restrained is given. The measurement of the drying shrinkage stress and depth of cracks caused by the drying shrinkage stress is made by using translation symmetric theorem and adopting dog-shaped specimens, and the analysis of changes in depth of cracks over time for two kinds of specimens is made. using the method of comparison ,the comparison of the gradient of the drying shrinkage stress for two kinds of specimens is made ,and it comes to the conclusion that the median drying shrinkage stress in the concrete fully restrained is higher in value by 1MPa compared to the drying shrinkage stress in non-restrained concrete
Publisher
Trans Tech Publications, Ltd.
Reference6 articles.
1. T Shiotani, J, Bisschop and J G M van Mier: Temporal and Spatial Development of Drying Shrinkage in Cement-based Materials, Engineering Fracture Mechanics, 2003(2)：91～111.
2. H Sadouki and J G M van Mier: Analysis of Moisture Flow in Cement Composites using a Lattice Type Approach, Materials & Structures, 1997(3)：579～587.
3. S P Shah, S E Swartz and C Ouyang: Applications of Fracture Mechanics to Concrete, Rock, and other Quasi-brittle Materials, Materials & Structures Materials & Structures, 1995(5)：77～93.
4. Bisschop L Pel and J G M van. Mier: Mechanism of Drying Shrinkage Micro-cracking in Concrete, Cement and Concrete Research, 2003(4)：33～54.
5. Lange D A: High performance concrete for transportation structures, Journal of Illinois University, 2003(3)：65～70.