Mechanism for reduction in compressive properties of cementitious materials in relation to internal crack patterns due to ASR and DEF expansion
Mechanism for reduction in compressive properties of cementitious materials in relation to internal crack patterns due to ASR and DEF expansion
复制标题
ASR 和 DEF 膨胀导致的与内部裂纹模式相关的水泥材料压缩性能降低的机制
DOI：
10.1016/j.cemconcomp.2022.104441
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发表时间：
2022
影响因子：
10.5
通讯作者：
Kawabata Yuichiro
中科院分区：
文献类型：
--
作者：
Miura Taito;Sato Katsuki;Fujishima Misato;Nakamura Hikaru;Kawabata Yuichiro
本研究讨论了由于膨胀现象导致内部开裂混凝土的压缩性能变化的机制。使用含有人造胶凝骨料的模型混凝土再现了由于碱硅反应（ASR）和延迟钙矾石形成（DEF）引起的内部裂缝模式。使用具有数字图像相关性的单轴压缩测试阐明了压缩行为。因此，就 ASR 而言，模型混凝土力学性能降低的趋势与无应力条件下的膨胀现象不同，并且观察到由于骨料裂纹方向变化而引起的力学性能变化的各向异性。对于 DEF，机械性能的降低与脱粘裂纹的厚度无关。因此，基于横截面区域的压应力传递路径，提出了由于 ASR 和 DEF 导致骨料开裂和间隙形成导致抗压强度和弹性模量降低的机制。
This study discusses the mechanism for the changes in the compressive properties of internally cracked concrete due to expansion phenomena. The internal crack patterns due to alkali-silica reaction (ASR) and delayed ettringite formation (DEF) are reproduced using the model concrete with artificial cementitious aggregate. The compressive behaviors are clarified using a uniaxial compressive test with digital image correlation. As a result, in terms of ASR, the trends for reduced mechanical properties in model concrete differ from the expansion phenomena under stress-free condition and the anisotropy of change in mechanical properties due to the aggregate crack orientation changes is observed. For DEF, the reduction in mechanical properties is independent of thickness of a debonding crack. Consequently, the mechanism for reduction in compressive strength and elastic modulus by the aggregate cracking and gap formation due to ASR and DEF based on the compressive stress transfer path at the cross-sectional area was proposed.
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