The tunnel road pavement performance study (1972)
Type of ContentTheses / Dissertations
Thesis DisciplineCivil Engineering
Degree NameDoctor of Philosophy
PublisherUniversity of Canterbury
This thesis is concerned with the instrumentation and testing of a half mile of experimental pavement that was constructed as part of the access road from Christchurch to the Christchurch-Lyttelton Road Tunnel. Testing of the experimental pavement was carried out with two objectives in mind. Firstly, to assess the performance of various high quality basecourse materials; and secondly, to gain experience with the instrumentation and testing of full-scale experimental pavements in New Zealand.
The experimental pavement consisted of eleven different test sections and included bitumen treated; tar treated; cement treated; soil cement; and unbound granular basecourse materials. The performance of the test sections was assessed from measurements of surface distress and the amo nt of permanent deformation of the pavement surface. The performance of the test sections was also monitored by use of the Benkelman Beam.
Subgrade moisture content measurements; in-situ C.B.R. tests; pressure cell measurements; plate bearing tests; and sonic testing were carried out at various times on the eleven test sections.
A separate full-scale model of the bitumen treated test section was built and tested by the author.
As an experiment in experimenting the study was a success, but due to poor design of the experiment, the study did not yield satisfactory data on the comparative performance of the various basecourse materials. Analysis of data from the study was complicated by the variables introduced due to the location of the experimental pavement on a section of the access road that had a 3% gradient and which contained a short radius horizontal curve with high super-elevation.
All of the test sections with treated basecourse materials· failed within the first four years of traffic, with the exception of the 8 inch depth of the cement treated basecourse. The performance of the cement treated and soil cement basecourses was especially poor.
Three of the four test sections with unbound granular basecourse also failed within the first four years of traffic. From a theoretical analysis it was deduced that the unbound granular basecourse materials were subject to decompaction during the period of testing. The performance of the granular basecourse sections was closely related to the magnitude of the Benkelman Beam deflections.
Results from the full-scale model pavement were significantly different from theoretical values derived using elastic layer theory. Measurements on the model yielded high radial compressive strains under single wheel loading. These compressive strains have a marked effect on the magnitude of the single wheel load which is equivalent to the standard 90001b. dual wheel load. Based on the author's results the equivalent single wheel load is 3800l_b. for the model pavement.
KeywordsPavements--Testing; Road materials--Testing.; Roads, Experimental--Testing.
RightsAll Right Reserved
Showing items related by title, author, creator and subject.
An experimental study of the deformational and performance characteristics of foamed bitumen stabilised pavements Gonzalez, Alvaro Andres (University of Canterbury. Civil and Natural Resources Engineering, 2009)The research presented in this thesis studies the effects of foamed bitumen on the deformational behaviour and performance of pavement materials. The research was conducted in the laboratory and the field, using specific ...
The development and verification of a pavement response and performance model for unbound granular pavements Steven, Bruce Daniel (University of Canterbury. Civil Engineering, 2005)The research presented in this thesis covers the development, calibration and verification of two thin surfaced unbound granular pavement models: one model to predict the response of a pavement to loading by the monotonic ...
Saleh, M.F. (University of Canterbury. Civil Engineering., 2006)Pavement edge failure has been encountered on many New Zealand state highways due to the lack of lateral support and the encroachment of heavy axle loads onto the edge of pavement. The main objective of this research work ...