Assessing durability of pavement sealants based on surface preparation techniques
Copyright © 2018 by ASTM International. Joints are introduced into concrete pavement to control cracking and to allow thermal movements. Sealing of concrete pavement joints to keep incompressibles and water out of the system is critical for the long-term performance of a roadway. Water introduced into the system through the joints can destabilize the slabs and accelerate the degradation of the load transfer rods. Incompressibles introduced into the joints will retard and inhibit the designed movement of the joints. This study assesses the durability of three different sealants placed in assemblies utilizing concrete typical of roadways with various surface preparation methods. Sawed concrete blocks were evaluated with various consolidating primers on concrete. Joint assemblies were fabricated with sealant according to ASTM C719-14 dimensions and subjected to tension movement after immersion in MgCI2 solutions at various temperatures. Visual inspection based on ISO 19862 criteria for adhesion performance was recorded so that surface preparations/treatments could be compared to one another. Controls of joint assemblies immersed in tap water at elevated temperatures showed that MgCI2 had a significant impact on the durability of two of the three sealants tested. This test method of evaluating the adhesion degradation in salt solutions at elevated temperatures proved to be a highly effective method of inducing failures in two of the three sealant materials tested.
ASTM Special Technical Publication
Assessing durability of pavement sealants based on surface preparation techniques.
ASTM Special Technical Publication,
STP 1604, 217-228.
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