Selecting an Appropriate Repair Material

An appropriate repair material can be selected once a project has been categorized based on the needed return to service. For depths exceeding 3 inches use material extended with coarse aggregate.
  • 3 hours: Use a preapproved Type B Ultra-Rapid Repair Material meeting the requirements of
    DMS 4655
    ,
    Concrete Repair Materials
    .
  • 6 hours: Use a preapproved Type A Rapid Repair Material meeting the requirements of
    DMS 4655
    ,
    Concrete Repair Materials
    .
  • 24 hours: Use Class K concrete. These are typically specialty mix designs supplied by a Ready-Mix plant. Mix design requires review and approval from the Engineer. Depending on the capabilities of local Ready-Mix plants this option may or may not be available.
  • 2 to 4 days: Class S concrete mixes, which are used to cast new bridge decks, offer the best likelihood of long term serviceability. However, it can take several days before the concrete has sufficient strength for return to service. Engineer should review the history of the proposed Class S mix to ensure that relatively fast strength gain (less than 4 days) is likely to occur. Even with rapid strength gain, Class S mixes should be moist cured for 72 hours (absolute minimum 48 hours).
For batched concrete, provide mixes meeting the requirements of Item 421, Hydraulic Cement Concrete. Note that typical Class HES mixes may not be classified as structural concrete, and should not be used, unless otherwise approved.