Evaluation of Bonding Agent Application on Concrete Patch Performance PDF Download

Author: Kyle Riding
Publisher:
ISBN:
Category : Adhesives
Languages : en
Pages : 0

Get Book Here

Book Description
"The durability of partial depth repair is directly related to the bond strength between the repair material and existing concrete. Bond strength development sensitivity to wait time with the use of bonding agents in partial depth repair was investigated in this study. Cementitious grouts, epoxy, acrylic latex, and ployvinyl acetate were used as bonding agents for portland cement concrete repair material. Portland cement concrete repairs with dry and saturated surface dry conditions, and three rapid repair cementitious materials were used for comparative purposes to investigate the benefits over other alternatives for using bonding agents. Laboratory samples were made by placing repair concrete 0, 2, 5, 10, and 30 minutes after bonding agent application. The bond strength was then measured using a direct shear test. Field tests were performed using the repair materials and bonding agents. When the agents were applied in the field, the wait times between bonding agent application and repair material application were 0, 15, 30, and 45 minutes. Seven-day and 5-month direct tension pull-off tensile tests were performed during the field experiment. The data from both experiments show that when using cement grout bonding agents, after 15 minutes, bond loss can be expected. Wait times did not have a significant effect on epoxy and acrylic latex bonding agents as long as they were placed before setting. The polyninyl acetate agent and repair materials can develop high bond strength in laboratory settings, but when used in the field, the bond strengths experience strength loss with time. The results also showed that adequate bond strength for many repairs can be obtained by placing the repair concrete on a substrate in saturated surface dry condition" (page x).