Performance of the saw cut and seal method for controlling reflection cracking

Title: Performance of the saw cut and seal method for controlling reflection cracking
Author(s): M.H. Burtwell, I. Carswell, W.G. Lloyd
Paper category : conference
Book title: Fourth International RILEM Conference on Reflective Cracking in Pavements - Research in Practice
Editor(s): A. O. Abd El Halim, D. A. Taylor
and El H. H. Mohamed
Print-ISBN: 2-912143-14-4
e-ISBN: 2351580265
Publisher: RILEM Publications SARL
Publication year: 2000
Pages: 345 - 355
Total Pages: 11
Nb references: 5
Language: English

Abstract: 
Trials to assess the performance of the saw cut and seal method for controlling reflection cracking in asphalt overlays over jointed concrete roads have been monitored at four sites in the UK since 1990. A slot is cut, cleaned and an approved sealant installed in the asphalt overlay above each joint in the concrete. The sealant reservoir effectively prevents any reflection cracks from occuring in the surface of the asphalt.

Trials were designed to investigate the performance of the saw cut and seal method for different thickness of overlay. Current UK requirements for overlay thickness on trunk roads and motorways is to lay at least 180 mm of asphalt. The saw cut and seal method coupled with a thinner asphalt overlay would prove a cost-effective alternative treatment.

Performance of the test sections is being assessed against control sections with conventional overlay, by visual inspection, coring through the joints and by deflection measurements. The test sections, incorporating saw cut and seal, are performing well although some cracking is occuring in the asphalt beneath the sealant reservoir. Substantial reflection cracking has developed in the equivalent control sections.

A draft specification has been developed based on the research findings and the UK Highways Agency is actively encouraging the use of the treatment.

Online publication: 2009-12-23
Publication type : full_text
Public price (Euros): 0.00