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Research and application on effective pavement contact width of doubledrum vibratory roller(PDF)

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年02期
Page:
120-126
Research Field:
汽车与机械工程
Publishing date:

Info

Title:
Research and application on effective pavement contact width of doubledrum vibratory roller
Author(s):
JIAO Shengjie XU Qinggang LIU Qiubao ZHANG Cuihong
(1. Highway Maintenance Equipment National Engineering Laboratory, Changan University, Xian 710064,Shaanxi, China; 2. Sany Heavy Industry Co., Ltd., Changsha 410100, Hunan, China)
Keywords:
mechanical engineering doubledrum vibratory roller effective contact width degree of overlap compaction velocity vibration frequency
PACS:
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DOI:
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Abstract:
In order to improve the compaction quality and compaction efficiency of doubledrum vibratory roller on pavement, the good matching relationship between compaction velocity and vibration frequency was determined. From the analysis on contact section between doubledrum vibratory roller and pavement, and on the basis of halfpower point, the concept of effective contact width of doubledrum vibratory roller was put forward and its mathematical model was presented. Based on the existing impact spacing theory, the degree of overlap was introduced to redefine the corresponding relation of compaction velocity and vibration frequency. And the model of effective contact width and index of overlap degree were used in the compaction test of asphalt mixture to verify it. The results show that the conceptual model of effective contact width can be used as the theoretical basis for selecting the process parameters combination of doubledrum vibratory roller. It can be pointed out that with increasing rolling times in the compaction process, material is changed from plastic to elastic and correction coefficient of effective contact width gradually changes from 0.5 to 1.0. By controlling the size of degree of overlap, materials after the same compaction times will have different degree of uniformity. When the selected degree of overlap obtains good uniformity, the corresponding compaction velocity and vibration frequency has good matching relationship. The compaction test results of AC13 asphalt mixture are in good agreement with the theoretical results. When the variation coefficient is 0.4%, compaction uniformity and compaction efficiency can be guaranteed. Then the compaction velocity of roller in every compaction time under high frequency vibration is also obtained. The pavement compactness and smoothness are in accordance with the acceptance standard of asphalt mixture highway. The parameter combination of compaction velocity and vibration frequency determined by the model of effective contact width and the concept of overlap degree provides a theoretical guarantee for improving the quality of pavement compaction. 2 tabs, 10 figs, 25 refs.

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Last Update: 2018-04-03