Accelerated Laboratory Evaluation of Joint Sealants Under Cyclic Loads

There is a need to establish performance-based laboratory procedures for testing of joint and crack sealants.This research proposes a cyclic loading laboratory test procedure to be performed at in-service temperatures, which applies to hot-pour sealants.Two types of hot-pour sealants were evaluated in this research to predict resistance to tensile and compressive extension.The test results at three temperatures *30oC, OoC and -30'C presented in this research highlight distinct differences in the behavior of low and standard modulus sealant types and confirm the superior performance of the low modulus sealants.Low modulus sealants are typically able to withstand larger extension.The accelerated testing compared sealants subjected to displacements similar to traffic and temperature loadings in the field.In general, and based on the limited number of sealant products tested, Type I sealants performed poorly when compared to Type IV sealants.Both Type I sealants and two Type fV sealants failed prematurely at the 0'C and -30oC temperatures.The optimized selection of joint sealant products can extend pavement service life and reduce annual maintenance and rehabilitation needs particularly in regions which experience extreme climatic conditions.Tluee criteria were used to rank the sealants: percent load drop versus temperature, normal stress analysis and maximum surface stress analysis.Each method allowed the sealants to be grouped into three categories, sealants that performed well, sealants with average performance and sealants with poor performance.From the three critea, rankings were applied to the sealants as follows: Sealants D and E had good performance, sealants F, G and H performed satisfactory and sealants A, B and C performed poorly.More emphasis was placed on the low temperature results from each criterion which gives better performance rankings to sealants D and E as opposed to sealants F, G and H. task will require collaborative work with the manufacfurers and local suppliers to upgrade curent practices.using laboratory methods and field laboratory test procedure that gives 1.3 Scope Manufacturers were invited to participate in a joint field and laboratory crack sealant study.The scope of this study is limited to 8 of the hot-pour materials provided by the manufacturers.This study contains the results of the laboratory evaluation performed on these sealants.The field samples were placed in the summer of 2004 and the first year evaluation of these field trials will not be completed until the spring of 2005.The laboratory results will be corelated with the performance of the sealants in the field trial.Due to the long term nature of the field trial it was not possible to include the field results within this research.It is anticipated that this will be completed by September 2006.This research looks to develop a laboratory evaluation procedure to be used to predict the performance of new joint and crack sealants for use in Manitoba's cold climate.Based on the cyclic test procedure at three in-service temperatures, new materials can be tested and compared to past performance.The benefits of this research are the ability to test new products on the market and ensure their suitability for maintaining an effective seal in cold climates.Field trials require a minimum of two years perforrnance to select the suitability of the material for this climate, laboratory evaluation can be completed in a maximum of two months, allowing local transportation agencies quicker access to new, cost-effective and better performing materials. Organization of

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