基于RAP料级配变异性的再生沥青混合料路用性能评价

以细度模数的变化为评价RAP料级配变异性的指标,通过车辙试验、低温SCB断裂试验作为评价再生沥青混合料多种性能的试验方法,评估多来源RAP料级配变异性对再生沥青混合料路用性能的影响。结果表明再生沥青混合料高温性能的动稳定度随着细度模数和SCB断裂能波动其变异系数达到了20%以上,说明级配变异性对再生沥青混合料路用性能有着很大影响。

小资料

粒状泡沫塑料保温被东江水电站施工中,为了加强坝体混凝土的保温工作,避免和防止混凝土早期裂缝的发生,自1984年11月开始,大量使用粒状泡沫塑料保温被保温,规格分1.5×3.0m和1.5×2.0m两种。

Effect of absorption boundary layer on nonlinear flow in low permeability porous media

Taking low permeability cores of Daqing oilfield for example,the flow characteristics at low velocity were studied with the self-designed micro-flux measuring instrument.Considering the throat distribution and capillary model,the thickness of fluid boundary layer under different pressure gradients was calculated,and the mechanism and influencing factors of nonlinear percolation were discussed.The results show that the percolation curve of ultra-low rocks is nonlinear,and apparent permeability is not a constant which increases with pressure gradient.The absorption boundary layer decreases with the increase of pressure gradient,and changes significantly especially in low pressure gradient,which is the essence of nonlinear percolation.The absorption boundary layer is also found to be impacted by the surface property of rocks.

高强混凝土路面砖生产控制要素的探讨

本文叙述了影响高强度混凝土路面砖质量的原材料及生产工艺控制点,总结生产实践经验,提出高强混凝土路面砖生产的诸多工艺控制要素及级配中"细度模量"概念。