CREEP BEHAVIOUR OF ALKALI-SILICA REACTION DAMAGED CONCRETE WITH SLOW-REACTING AGGREGATES
CREEP BEHAVIOUR OF ALKALI-SILICA REACTION DAMAGED CONCRETE WITH SLOW-REACTING AGGREGATES
复制标题
慢反应骨料碱硅反应损伤混凝土的蠕变行为
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Reinhardt
中科院分区：
文献类型：
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作者：
Oliver Mielich;H. Özkan;H. Reinhardt
碱-硅反应（ASR）损坏的混凝土结构在一些情况下仍在使用很长一段时间。为了计算ASR损伤结构的剩余强度和变形，需要知道结构的强度、弹性模量和蠕变。采用四种慢反应集料配制的混凝土在德国雾室中40°C下暴露560天。聚集体呈现出不同的特征，并且ASR敏感性不同。他选择了四种骨料进行研究，一种杂砂岩，两种石英斑岩和一种来自上莱茵河河谷的碎石。在固定的时间间隔内测量抗压强度、静态弹性模量以及徐变和收缩变形。结果表明，静态弹性模量是显着更受ASR比抗压强度。此外，ASR影响蠕变行为，这强烈地依赖于化学反应的动力学速率（演变）。
Concrete structures damaged by alkali-silica reaction (ASR) remain in use in several cases for a long period of time. To calculate the residual strength and the deformation of ASR damaged structures knowledge of the strength, elastic modulus and creep are required. Concretes with four types of slow-reacting aggregates have been exposed in German fog chamber at 40°C for 560 days. The aggregates present different characteristics and differ in ASR susceptibility. Four aggregates were selected for his research, a greywacke, two quartz porphyries and a crushed gravel from the Upper Rhine valley. Compressive strength, static modulus of elasticity as well as creep and shrinkage deformations were measured at fixed intervals. It is shown that static modulus of elasticity is significantly more affected by ASR than compressive strength. Furthermore, ASR affects the creep behaviour, which depends strongly of the kinetic rate (evolution) of the chemical reaction.