基于级配优化对掺水泥泡沫沥青就地冷再生混合料高温性能的影响

研究了水泥、机制砂、19~26.5 mm粗集料掺量对泡沫沥青冷再生混合料高温稳定性能的影响。结果表明:随着水泥用量增加，冷再生混合料高温稳定性能逐渐增加，至少提高160%；随机制砂掺量增加，冷再生混合料高温稳定性能，先增大后减小，当机制砂用量为20%时，高温稳定性能至少提高62%；随19~26.5 mm粗集料用量增加，冷再生混合料高温稳定性能，先增加后减小，当粗集料用量为10%~20%时，冷再生高温稳定性能，至少提高105%；基于高温稳定性能进行级配优化时，应优选考虑掺加1.5%水泥和10%~20%的19

Effect on High Temperature Performance of Cold In-place Recycled Cement Foamed Asphalt Mixture Based on Grading Optimization

Herein how the content of cement, machine-made sand and coarse aggregate in 19~26.5 mm affect the high temperature stability of cold recycling mixture with foamed bitumen was studied. The result shows that, as the content of cement increases, the high temperature stability of the mixture increases gradually, at least by 160%; as the content of machine-made sand increases, the stability thereof increases first and then decreases, and at least increases by 62% in case of 20% sand mixed; as the content of coarse aggregate in 19~26.5 mm increases, the stability thereof increases first and then decreases, and at least increases by 105% in case of 10%~20% such aggregate mixed. Therefore, for the grading optimization based on high temperature stability, 1.5% cement and 10%~20% coarse aggregate in 19~26.5 mm are preferred, then the content of machine-made sand is considered according to the regeneration requirement.