硅藻土替代比例对沥青胶砂蠕变变形性能的影响研究

High temperature and anti-ageing properties of asphalt could be improved by the addition of diatomite as researched in previous papers. It is believed to be alternative superior mineral filler in the construction of asphalt pavement in comparison with ordinary limestone powder. In this paper, compression strength and anti-deformation properties of asphalt sands with different content of diatomite were investigated by uniaxial compression failure test and uniaxial compression creep test. Five groups of asphalt sands with different volume content (0:1, 0.25:0.75, 0.5:0.5, 0.75:0.25 and 1:0) of diatomite to limestone were selected. The compression strength and secant modulus were firstly increased with the increasing of diatomite's content and then decreased when it exceed 0.75 whilst the creep strain was firstly decreased and then increased with the increasing of that. The compression strength and anti-deformation properties of asphalt sands were improved by the replacement of diatomite.