Experimental Study on Waterproofing Properties of Putty-Based Composite Rubber Strip for Underground Post-Tensioned Precast Concrete Structures

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Title: Experimental Study on Waterproofing Properties of Putty-Based Composite Rubber Strip for Underground Post-Tensioned Precast Concrete Structures

Author(s): Xiang‑guo Wu, Xiao‑kai Chen, Shi‑yan Yu, Seongwon Hong and Thomas H.‑K. Kang

Publication: IJCSM

Volume: 13

Issue:

Appears on pages(s):

Keywords: full‑scale tests, joints, precast concrete structure, putty‑based composite rubber strip, waterproofing, post‑tensioning

Date: 1/31/2019

Abstract:
The proper assembly of underground precast concrete structures is often critical in the construction of underground structures. In particular, interfacial waterproofing between precast concrete segments is a key factor influencing use, safety, and life span. Current practice is to incorporate waterproofing rubber strips in the design. During the instal‑ lation process, compressive stress is applied to the strip by post‑tensioning to achieve performance. For this paper, lateral constraint compression tests were carried out on composite rubber seal strips that utilize putty. Special water‑ proofing and sealing test devices were designed to investigate corresponding relationships between water pressure and compressive stress (or strain). A relationship between water resistance pressure and compression stress and strain of the putty‑based composite rubber strip was proposed based on the series tests and the control target of the minimum compression strain of the putty composite rubber strip was then suggested. Finally, full‑scale waterproof‑ ing tests on tunnel joints were conducted. The experimental results provide a scientific reference for the engineering application and design of composite sealing rubber strips putty for underground post‑tensioned precast concrete structures.


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