Determining the quantity of access tubes for quality control of bored pile concrete based on probability approach

  • Bach Duong Faculty of Hydraulic Engineering, National University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam

Abstract

Unexpected defects of concrete in a completed bored pile can arise during the construction stage. Therefore, post-construction testing of bored pile concrete is an important part of the design and construction process. The Cross-hole Sonic Logging (CSL) method has been the most widely used to examine the concrete quality. This method requires some access tubes pre-installed inside bored piles prior to concreting; the required quantity of access tubes has been pointed out in few literatures and also ruled in the national standard of Vietnam (TCVN 9395:2012). However, theoretical bases aiming to decide the required quantity of access tubes have not been given yet. A probability approach is proposed in this paper aiming to determine the essential quantity of access tubes, which depend not only on pile diameters, magnitude of defects, but also on the technical characteristics of CSL equipment.

Keywords:

access tubes; bored piles; CSL method; defects; inspection probability.

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Published
17-04-2020
How to Cite
Duong, B. (2020). Determining the quantity of access tubes for quality control of bored pile concrete based on probability approach. Journal of Science and Technology in Civil Engineering (STCE) - NUCE, 14(2), 76-86. https://doi.org/10.31814/stce.nuce2020-14(2)-07
Section
Research Papers