Evaluation of Detecting Cavity under Cement Pavement Slab by Deflection Difference of the Same Slab and Pumping Height

At present, the domestic and overseas methods of detecting cavity under cement pavement slab have disadvantages such as difficulty of calculation, complicated use and poor practicality. In the view of this, methods of detecting cavity based on deflection difference of the same slab and pumping height are proposed. Taking Yantai—Weihai highway testing part as attaching project, first, the basic principle of detecting cavity by deflection difference of the same slab is introduced, and then the evaluation index about the cavity under slab is calculated theoretically. According the comparative measurement in field between dynamic and static deflection by using BB and FWD, the deflection difference among the centre point, the midpoint of edge and the corner of the same slab is calculated. On this basis the evaluation criterion for detecting cavity with dynamic and static deflection difference is recommended after statistic analysis, and the quantitative relationship between the pumping height and the degree of cavity is established by analyzing the data of pumping observation statistically with the criterion of deflection difference above. The result of core-drilling indicates that these evaluation methods have high accuracy and reliability.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 49-54
  • Monograph Title: International Conference on Transportation Engineering 2009

Subject/Index Terms

Filing Info

  • Accession Number: 01532536
  • Record Type: Publication
  • ISBN: 9780784410394
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 1:47PM