关键词: 水泥混凝土路面;早期开放交通;早期力学特性;寿命损失

Abstract: The vehicle load will cause damage to the new cement concrete pavement due to the early opening to traffic.Based on the Miner linear damage theory,the life loss model of cement concrete pavement was constructed, on this basis, the effect of different design parameters on the life loss was studied.Finally,during the strength formation of cement concrete, the life loss <1% was used as the standard to evaluate what the pavement thickness required at different times to open traffic.The results show that the early flexural tensile strength and modulus of elasticity of concrete are in semi logarithmic relationship with the curing age,the change of daily traffic volume,surface thickness and base thickness has great effect on the life loss of cement concrete pavement, the change of the subgrade and soil base elastic modulus is not obvious for the life loss by the early opening traffic.In order to achieve the goal of opening the traffic early in the construction of cement concrete pavement, traffic control and increase of pavement design thickness are the most effective,the conclusion of this study can provide a reference for the design of cement concrete pavement and the determination of the best opening traffic time.

Key words: cement concrete pavement;early opening traffic;early mechanical properties;loss of life