掺水泥泡沫沥青冷再生混合料路用性能研究

为优化泡沫沥青就地冷再生混合料级配，研究了水泥、机制砂和19～26.5 mm粗集料对泡沫沥青冷再生混合料路用性能的影响。结果表明:与不掺水泥相比，掺1.5%的水泥，冷再生混合料的冻融强度比、动稳定度、弯拉强度分别提高19.0%，160.0%，18.0%。机制砂掺量为20.0%时，与不掺机制砂相比，冻融劈裂强度比、动稳定度、抗弯拉强度可分别提高10.0%，62.0%，13.0%；9.5~19 mm粗集料掺量为10.0%～20.0%时，与不掺粗集料相比，动稳定度可至少提高96.0%。建议冷再生混合料中19～26.5 mm粗集料掺量为10.0%～20.0%，机制砂掺量为20.0%，水泥掺量为1.5%。

Study on Pavement Performance of Cold Regenerated Mixture of Foam Asphalt Mixed with Cement

In order to optimize the gradation of local cold regenerated mixture of foam asphalt, the effect of cement, mechanical sand and coarse aggregate of 19~26.5 mm on the pavement performance of cold regenerated mixture of foam asphalt was studied. The results showed that with 1.5% cement,the freeze-thaw strength ratio, dynamic stability and flexural strength of the cold regenerated mixture increased by 19.0%, 160.0% and 18.0% respectively compared with that without cement. When the content of mechanical sand is 20.0%, the freeze-thaw split strength ratio, dynamic stability and flexural tensile strength can be increased by 10.0%, 62.0% and 13.0% respectively compared with that without mechanical sand;When the content of the coarse aggregate of 9.5~19 mm is 10.0%~20.0%, the dynamic stability can be improved by at least 96.0% compared with that without coarse aggregate;It is suggested that the content of coarse aggregate of 19~26.5 mm in cold regenerated mixtures is 10.0%~20.0%, that of mechanical sand 20.0% and that of cement 1.5%.