Key technology of exposed-aggregate cement concrete pavement

Through test and theoretical analysis,authors study technology properties,such as the brushing-washing time, the maturity, the strength of concrete paved in dual-layer, which are inevitably involved in construction of exposed-aggregate cement concrete pavement, and analyze key influence factors on brushing-washing time and maturity. It is pointed that the higher the temperature the earlier the brushing-washing time;there is a bigger interval, more than 10 h for normal temperature between the earliest and latest brushing-washing time;the maturity increases with temperature;the strength of concrete specimen vibrated on dual-layer at a time interval is almost equal to that of concrete vibrated on one-layer. The results indicate that the maturity and trial method are effective ways to assess and test the technology properties of the pavement and the dual-layer paving method is an effective manner to decrease the cost of the pavement.