Polymer modified asphaltic plug joints; Installation and long-term performance (AGB1995/001)
Overview
Background & policy context:
The study monitors and investigates the impact of material properties and site practice and conditions on the field performance of plug expansion joints over a five-year period.
Objectives:
The objectives of this study were twofold. Firstly to investigate the influence of the material properties in the delivered condition, the installation method and ageing due to the installation process as well as the durability of the asphaltic plug joints during use. Secondly to examine the relevance of laboratory studies with regard to the behaviour of the asphaltic plug joints in practice by monitoring the object over a period of five years.
The objective of the study was to create a sound basis not only for ensuring the durability of the asphaltic plug joints but also to provide useful material for the revision of the ASTRA Swiss Guideline for asphaltic plug joints.
Methodology:
With the assistance of various cantonal public works departments, 18 plug joints were installed for monitoring in six cantons during 1996 and 1997. The selected systems were the four most commonly used products in Switzerland. All operations performed during installation were precisely observed and recorded. To permit assessment of the material impact on the structure's behaviour, of the changes in material properties caused by varying site conditions and in-service ageing, the properties of the installed materials were examined in the original state, following incorporation and service using chemical/physical analytical methods. Changes in the condition of the plug joint systems, e.g. debonding, cracking, blistering, material displacement etc., were periodically surveyed and recorded by an expert group. In addition, long-term measurements of joint movement were taken and the polymer modified APJ temperatures recorded for one of the structures.
Share this page