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 installation 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 waterproofing 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 waterproofing 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.
Highlights
Waterproofing is typically a key design goal for underground precast concrete structures (Ossai 2017)
To evaluate the waterproofing ability at joints, special attention is directed to the sealant behavior of the Ethylene-Propylene-Diene Monomer (EPDM) sealing strips
The joint open width is regarded as a key performance indicator, since it is the weakest part of the shield segmental lining (Liao et al 2008; Zhang et al 2015)
Summary
Waterproofing is typically a key design goal for underground precast concrete structures (Ossai 2017). Mechanical properties of rubber strips along with groove design at precast concrete structure joints are key elements in waterproof design. Mechanical tests for compressive stress and strain of putty-based composite rubber strips along with waterproofing performance tests at the interface between putty-based composite rubber strips and concrete are conducted These tests investigate influence of strip compressive force and the joint stretching value on waterproofing of sealing rubber strips. It attempts to establish a design model and proposed control target for mechanical and waterproofing properties of this new type of rubber strip. The research work of this paper provides a scientific reference for the engineering application and design of composite sealing rubber strips with putty for underground post-tensioned precast concrete structures
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