石粉含量对碾压混凝土性能的影响

通过外掺法，研究了16%，20%，24%不同的石粉含量对碾压混凝土的拌和物性能、力学性能及耐久性能的影响，并与石粉含量为11.5%的基准碾压混凝土进行了对比。研究结果表明：随着外掺石粉含量的增加，碾压混凝土的VC值相应增加，含气量相应降低；碾压混凝土中的空隙率能得到填充，其振实密度也相应增大，密实性有所提高。对抗渗性能而言，石粉含量从11.5%，增加到16%，抗渗系数有明显降低，石粉含量超过16%时，抗渗系数基本趋于稳定。石粉含量对于抗压强度的影响，存在一个最佳石粉含量范围，即石粉含量在16%～20%时，抗压强度值最高；石粉含量大于20%时，碾压混凝土抗压强度随石粉含量的增加而呈下降趋势。

Influence of Stone Powder Content on RCC Performance

By mixing stone powder with 16%,20% and 24% of content rate respectively,the influence of different stone powder contents on fresh concrete,mechanical properties and durability of RCC are studied.The results are compared with those of RCC with 11.5% stone powder.The research results are summarized as follows: The value VC increases and air content decreases with the increase of the mixed stone powder content.Meanwhile,the interstices in RCC can be filled which will result in higher volume weight and more compact concrete.While the stone powder content increases,the permeability coefficient will be abated.When the powder content exceeds 16%,the permeability coefficient comes to a constant.The prime range of powder content is between 16%-20%,which leads to the higher compressive strength.While the content exceeds 20%,the compressive strength of RCC decreases with the increase of powder content.