摘要
简要评述了碱骨料反应与冻融破坏的特征判据。在微观上，碱骨料反应引起的破坏始于骨料，裂纹多由骨料延至浆体，存在始于骨料内部的裂纹，并有新产物生成；在宏观上表现为无规则裂纹直至整体性开裂，有时可直接观察到产物渗出。冻融破坏属物理作用，只涉及基体情况下的冻害导致骨料与浆体之间出现空隙；多孔骨料引起的冻害与碱骨料反应有些类似，但没有新产物生成。宏观上，冻融破坏常常表现为表面剥落和开裂，砂浆本体往往出现碎裂。
Characteristics of failure caused by AAR and freeze/thaw in Concrete are briefly reviewed in the paper. On microscopic scale, AAR results in cracks originating from aggregates or inner parts of aggregates, and new products around or in aggregates. On macroscopic scale, AAR causes random cracks or bulk cracking. Freeze/thaw is a kind of physical process. Paste -induced freeze/thaw results in cracks around aggregates while freeze/thaw failure caused by porous aggregates is similar to that of AAR in some aspects except that it does not bring about products. On macroscopic scale,freeze/thaw often results in surface scaling or cracks and breakdown of paste.
出处
《低温建筑技术》
北大核心
1995年第3期6-8,共3页
Low Temperature Architecture Technology
