荷载作用下绿色再生混凝土碳化行为及其微观机理研究

Carbonization Behavior of Green Recycled Concrete and Its Micro Mechanism Under the Action of Load

文章以强度等级C30绿色再生混凝土为目标,以高强的道路废弃混凝土为骨料来源,通过对试件施加弯曲荷载和采用快速碳化方法,确保循环骨料的代表性,将二次循环后的Ⅱ级再生骨料替代天然砂石制备高品质绿色再生混凝土。研究了弯曲荷载作用下绿色再生混凝土碳化行为,并采用电镜扫描SEM分析,通过比较内部微观形貌,探讨了绿色再生混凝土碳化后的微观机理。

Green recycled concrete in C30 strength grade was taken as the research target, and wasted high strength road concrete was used as aggregate source. To insure the representativeness of the recycled ag- gregate, bending load and rapid carbonization were applied to recycled concrete specimens. The recycled aggregates at level 2 were used to replace natural sand and gravel to cast high quality green recycled concrete. The carbonization behavior of green recycled concrete specimens under the action of bending load was studied, and its micro mechanism of green recycled concrete was also discussed through the scanning electron microscopy （SEM） analysis and a comparative study of internal microstructures.