In order to investigate the effects of different water-binder ratios and mineral admixtures such as limestone powder on the durability of composite limestone powder concrete,experimental studies were conducted on the durability performance of ordinary con-crete,limestone powder-slag concrete and limestone powder-slag-fly ash concrete with respect to carbonation,freeze-thaw and chloride ion erosion.The results show that under the condition that the total amount of mineral admixture is fixed at 50％,①reduce the water-binder ra-tio can improve the composite limestone powder concrete resistance to carbonation,freeze-thaw,chloride ion erosion performance;②the addition of limestone powder can optimize the particle gradation of the composite limestone powder concrete cementitious material sys-tem,thus improving the resistance to freeze-thaw and chloride ion erosion;③slag caused by the volcanic ash effect of secondary hydration,on the one hand,reduces the alkalinity of composite limestone powder concrete,weakening the resistance to carbonation,on the other hand,the hydration gelation products improve the compactness of composite limestone powder concrete,improving the resistance to freeze-thaw and chloride ion erosion;④Fly ash in equal proportions instead of slag is detrimental to the durability of composite limestone powder concrete in terms of resistance to carbonation,freeze-thaw and chloride ion attack in the early stage.
关键词
水胶比/复合石灰石粉混凝土/碳化/冻融/氯离子侵蚀
Key words
water-binder ratio/composite limestone powder concrete/carbonation/freeze-thaw/chloride ion attack
维普
万方数据