[1]吴文亮,代生林,斯李.糠醛抽出油再生沥青的流变和感温性能研究[J].郑州大学学报(工学版),2022,43(03):52-58.
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糠醛抽出油再生沥青的流变和感温性能研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年03期
页码:
52-58
栏目:
出版日期:
2022-04-10

文章信息/Info

Title:
Research on Stability of Loess Roadbed Reinforced with Cement-soil Mixing Piles
作者:
吴文亮代生林斯李
文献标志码:
A
摘要:
为了解糠醛抽出油作为沥青再生剂对不同老化程度沥青的再生效果,对糠醛抽出油再生沥青的流变性能和感温性能进行研究。通过将糠醛抽出油添加到轻度、中度和重度3种不同老化程度的沥青中,采用动态剪切流变试验和弯曲蠕变试验,研究糠醛抽出油对老化沥青的流变性能及感温性能的影响规律,并以不同指标对再生沥青的流变性能和感温性能进行评价。研究结果表明:随着糠醛抽出油掺量的增加,老化沥青的中温抗疲劳性能和低温抗开裂性能均得到提升,高温抗变形性能则降低不同老化程度的沥青在合适的糠醛抽出油掺量下性能能够恢复至基质沥青水平多重应力蠕变试验对沥青高温抗变形性能的评价比车辙因子更适用疲劳因子与线性扫描振幅试验对沥青中温抗疲劳性能的评价结果一致再生沥青的感温性能在不同的温度区间具有不同的表现,在46~76℃时,随着糠醛抽出油掺量的增加,3种再生沥青的感温性能均增强在-18~-6℃时,蠕变速率指数对感温性能的评价结果比蠕变劲度指数好,重度老化再生沥青的感温性能随着糠醛抽出油掺量的增加而增强,轻度和中度老化再生沥青的感温性能则相对减弱。以各项指标基本恢复到基质沥青水平为标准确定的最佳掺量为轻度老化4%,中度老化7% ,重度老化 8% 。
Abstract:
Aiming to solve the problem of the stability of roadbed in the condition of rainfall infiltration in loessarea,cement-soil mixing pile was adopted as the foundation reinforcement treatment method. Based on thefoundation geotechnical test of loess and the unconfined compressive strength test results of cement soil modi-fied with different amounts of fly ash and coal gangue,according to the M-C criterion and the load-settlementprinciple of roadbed in rainfall infiltration conditions, the roadbed model treated with cement soil mixing pilein rainfall infiltration was constructed by using the finitc element analysis software ABAQUS. Combined withthe numerical simulation results,the load settlement variation law of loess roadbed reinforced with cement-soilmixing piles with different rainfall duration ,rainfall intensity and pile elastic modulus was analyzed the bear-ing characteristics of loess roadbed were discussed and the influence of rainfall infiltration on the stability ofloess roadbed was explored. The research results showed that the cement-soil mixing pile had a significantstrengthening effect on the vertical direction of the loess roadbed in the condition of rainfall infiltration , and thedisplacement of the roadbed slope foot could increase with the increase of rainfall intensity and rainfall dura-tion. In the condition that the rainfall intensity was 2 mm/h and the rainfall duration was 18 h, the road pave-ment settlement decreased with the increase of pile elastic modulus. When the elastic modulus of the pile was300 MPa,the cement-soil mixing pile had the best reinforcement effect on the loess roadbed.Keywords: rainfall infiltrationloesscement-soilroadbeds reinforcementABAQUS
更新日期/Last Update: 2022-05-02