尺寸效应在大掺量活性掺合料混凝土抗碳化性能研究中的影响

Size Effect on Carbonation Depth of Concretes with High-volume Fly-ash and GGBS

采用固定混凝土坍落度的方法,研究了大掺量粉煤灰、磨细矿渣及其双掺对混凝土抗碳化性能的影响,并对尺寸效应进行了探讨.研究结果表明:随着粉煤灰掺量的增加,混凝土的碳化深度逐渐加大,双掺磨细矿渣和粉煤灰的混凝土的抗碳化能力明显优于单掺粉煤灰的情况.对于碳化问题同样存在尺寸效应,混凝土的碳化深度随着试块尺寸的增大而增大;并且早期尺寸效应影响较大,粉煤灰掺量越高其碳化尺寸效应越明显.

The carbonation resistance of concretes with high-volume fly-ash and ground granulated blast-furnace slag had been studied,and the size-effect was explored.The results show that the more fly-ash joined in,the carbonation depth is deeper.The carbonation resistance of concretes with highvolume fly-ash and GGBS is better than only with high-volume fly-ash's.Size effect on carbonation depth of concretes is also important.Carbonation depth will become deeper as soon as the block size improving,and the early improvement is bigger than the late.In the more concretes with high-volume fly-ash and ground granulated blast-furnace slag,the size effect on carbonation depth of concretes will be more evident.