石灰石粉对混凝土耐久性的影响研究

Research on durability of concrete mixed with limetone powder

研究了石灰石粉对混凝土干燥收缩及抗冻性能的影响。结果表明,随着石灰石粉掺量的增大,混凝土收缩逐渐增大;随着石灰石粉细度的增大,混凝土收缩逐渐减小,低掺量的超细石灰石粉可以抑制混凝土的干燥收缩;石灰石粉的掺入降低了混凝土的抗冻性,石灰石粉的细度越大,对混凝土抗冻性能的影响越小。

The effect of the limestone powder on the drying shrinkage and frost resistance of concrete are investigated in this paper.The results show that the drying shrinkage increases with the increase of limestone powder content.The drying shrinkage decreases with the increase of limestone powder fineness,and it can be restrained with low dosage of ultrafine limestone powder.The addition of limestone powder reduces the frost resistance of concrete.The greater the fineness of limestone powder,the smaller the impact on the frost resistance of concrete.