再生骨料混凝土耐久性能影响因素研究(英文)  

Influence Factors of Durability of the Recycled Aggregate Concrete

作　　者：高嵩[1] 李秋义[1] 陈建珍 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266000 [2]武汉市建筑工程质量检测中心有限公司,湖北武汉430022

出　　处：《中山大学学报（自然科学版）》2009年第S2期20-22,共3页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家“十一五”科技支撑计划重点基金资助项目(2006BAJ02B0504)

摘　　要：简单破碎再生骨料混凝土的需水量很大,导致混凝土的收缩大、氯离子渗透系数大、碳化速度快以及抗冻性差等弱点。骨料颗粒整形技术可以除去骨料表面粘附的水泥石,减少表面微裂缝使得再生骨料变得圆滑,显著降低需水量,混凝土的收缩性能、抗氯离子渗透性、抗碳化性能和抗冻性能均显著改善,改善了再生骨料混凝土的耐久性能。Compared with natural aggregate,simply-crushed recycled aggregate particles are attached by many hardened cement mortar remains on its surface,and micro-cracks are formed in the crushing process.Therefore,simply-crushed recycled aggregate concrete requests greater water demand which in turn leads to larger shrinkage,greater chloride ion permeability coefficient,quicker carbonization and lower freezing-thawing resistance.Nevertheless,particle reshaping is able to remove the adherent mortar and makes aggregate particle smoother and stronger.The paper presents experimental researches on recycled concrete durability influences by particle-shaping. The results indicate that it reduces the water demand and the corresponding shrinkage,and herein improves the resistance to chloride ion permeability,carbonization property and freezing-thawing resistance.Consequently,the application domain of recycled concrete will be developed.

关 键 词：再生骨料 简单破碎 颗粒整形 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]