Cracking caused by restrained contraction of the repair material is a recurring problem in many repairs. As shown here, field performance decreases with increased drying shrinkage. Other important material properties include tensile strength, modulus of elasticity, and thermal coefficient of expansion. Also, performance criteria are provided for selection and specification of materials that are dimensionally compatible with the concrete substrate.

The seminar Concrete Repair II: Surface Preparation, Reinforcement Repair, Material Selection and Placement Techniques was presented by James McDonald, PE, FACI, and Peter Emmons at World of Concrete 2012.