RESTRAINT DEGREE AND EVALUATION OF CRACKING SENSITIVITY IN EARLY CONCRETE
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摘要: 收缩变形是混凝土早期开裂的驱动力,然而是否会发生开裂还与约束条件密切相关。此外,初龄期混凝土力学性质的发展也受约束程度影响。采用了单轴约束试验方法,分析了不同约束程度下混凝土约束应力、松弛性质和弹性模量的发展,并讨论了约束程度对早期开裂敏感性评价的影响。Abstract: Shrinkage deformation is a driving force to stress generation and cracking in early concrete,whereas the occurrence of cracking depends on the restraint condition. Furthermore,the degree of restraint greatly affects the mechanical properties of early concrete. The developments of restraining stress,creep behavior and elastic modulus in concrete were measured under different restraint degrees by uniax ial restrained shrinkage test,and the influence of restraint degree on evaluation of cracking sensitivity in early concrete was also discussed.
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Key words:
- cracking /
- restrained shrinkage test /
- restraint degree /
- relaxation/creep
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张士海,覃维祖,张 娟,等. 混凝土早 期抗裂性 能评价单轴约束试验方法的进展. 混凝土与水泥制品, 2002(3): 13-16 林志海,覃维祖,张士海,等. 虚拟仪器 技术在检 测混凝土 早期开裂敏感度试验中的应用. 工业建筑,2003,33(7): 37-40 Post asy F S,Tanabe T,Laube M. Assessment of External RestraintPPSpringenschmid R. Prevent ion of Thermal Cracking Concrete at EarlyAges. RILEM Report 15. London: EFN Spon,1998: 149-177 Salah A Altoubat,David A. Lange,Creep,Shrinkage,and Cracking ofRestrained Concrete at Early Age. ACI Mat erials Journal,2001,98(4):323-331
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