Meso-scale particle modeling of concrete deterioration caused by alkali-aggregate reaction
作者： Jianwen Pan , Y. T. Feng , Feng Jin , Yanjie Xu , Qicheng Sun
DOI: 10.1002/NAG.2157
关键词: Compressive strength 、 Modulus 、 Mortar 、 Particle modeling 、 Geotechnical engineering 、 Homogeneous 、 Alkali–aggregate reaction 、 Softening 、 Meso scale 、 Composite material 、 Materials science
摘要: SUMMARY A meso-scale particle model is presented to simulate the expansion of concrete subjected alkali-aggregate reaction (AAR) and analyze AAR-induced degradation mechanical properties. It first attempt evaluate deterioration mechanism due AAR using discrete-element method. A three-phase for composed aggregates, mortar interface established with combination a pre-processing approach flow code, PFC2D. homogeneous aggregate applied expansion. Uniaxial compression tests are conducted AAR-affected examine effects on Two specimens different sizes analyzed consider size AAR. The results show that valid predict internal micro-cracking patterns caused by two exhibit similar behavior. Young's modulus compressive strength significantly reduced increase shape stress–strain curves obtained from clearly reflects influence micro-cracks: an increased nonlinearity before peak loading more gradual softening severely affected specimens. Similar macroscopic failure under observed in terms diagonal cracks splitting specimen into several triangular pieces, whereas localized micro-cracks forming slightly branching diffusing ones, demonstrating mechanisms. Copyright © 2012 John Wiley & Sons, Ltd.
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