Effect of cracking in drying and shrinkage specimens
作者： Zdeněk P. Baǎnt , Warren J. Raftshol
DOI: 10.1016/0008-8846(82)90008-4
关键词: Composite material 、 Orders of magnitude (specific energy) 、 Thermal diffusivity 、 Shrinkage 、 Strain softening 、 Materials science 、 Shrinkage cracking 、 Fracture mechanics 、 Cracking 、 Stress drop
摘要: Abstract The significance of cracking and microcracking caused by nonuniform drying shrinkage test specimens is analyzed. To assure that no cracks are produced in load-free specimens, one must lower the environmental humidity gradually sufficiently slowly, use very thin (about 1 mm thick). Graphs for maximum admissible rate change humidity, calculated from both linear nonlinear diffusion theories, provided. spacing width parallel due to estimated fracture mechanics considerations. In normal size usually too narrow be visible. Drying leads discontinuous rather than continuous macrocracks represented better as strain softening an abrupt stress drop. Shrinkage can increase diffusivity several orders magnitude.
elsevier.com
sci-hub.se 参考文章(17)
Abubakr A. Bazant, Abubakr A. Wahab, Instability and Spacing of Cooling or Shrinkage Cracks Journal of Engineering Mechanics-asce. ,vol. 105, pp. 873- 889 ,(1979) , 10.1061/JMCEA3.0002529
James M. Becker, Boris Bresler, Reinforced Concrete Frames in Fire Environments Journal of the Structural Division. ,vol. 103, pp. 211- 224 ,(1977) , 10.1061/JSDEAG.0004529
Spencer T. Wu, Zdenek P. Bazant, Creep and Shrinkage Law for Concrete at Variable Humidity Journal of Engineering Mechanics-asce. ,vol. 100, pp. 1183- 1209 ,(1974) , 10.1061/JMCEA3.0001962
P.E. Petersson, Fracture energy of concrete: Practical performance and experimental results Cement and Concrete Research. ,vol. 10, pp. 91- 101 ,(1980) , 10.1016/0008-8846(80)90055-1
ZP Bažant, LJ Najjar, None, Nonlinear water diffusion in nonsaturated concrete Matériaux et Constructions. ,vol. 5, pp. 3- 20 ,(1972) , 10.1007/BF02479073
Horatio Scott Carslaw, John Conrad Jaeger, Conduction of Heat in Solids ,(1959)
Zdeněk P. Bažant, Abu Bakr Wahab, Stability of parallel cracks in solids reinforced by bars International Journal of Solids and Structures. ,vol. 16, pp. 97- 105 ,(1980) , 10.1016/0020-7683(80)90027-X
Zdeněk P. Bažant, Hideomi Ohtsubo, Kazuo Aoh, Stability and post-critical growth of a system of cooling or shrinkage cracks International Journal of Fracture. ,vol. 15, pp. 443- 456 ,(1979) , 10.1007/BF00023331
Sidney Mindess, Sidney Diamond, A preliminary SEM study of crack propagation in mortar Cement and Concrete Research. ,vol. 10, pp. 509- 519 ,(1980) , 10.1016/0008-8846(80)90095-2
S. Chatterji, N. Thaulow, P. Christensen, Formation of shrinkage cracks in thin specimens of cement paste Cement and Concrete Research. ,vol. 11, pp. 155- 157 ,(1981) , 10.1016/0008-8846(81)90018-1