Center for Transportation Studies University of Minnesota
Partial-depth patching mixes must rapidly gain strength to allow the roadway to be reopened to traffic quickly. A
patch should also bond well to the substrate to prevent the patch from separating from the existing material and be
durable enough to withstand harsh winters. The objective of the research described in this report is to develop
improved guidelines for evaluation of pre-bagged commercial patching mixtures and to recommend effective
construction practices. To achieve these objectives, 13 different cementitious materials were selected and tested to
determine key properties including strength gain, shrinkage, bond strength, and durability. The impact of the
proposed research will be a better performing patch material as well as performance criteria that can be used to
compare the materials tested in this program to new materials that will certainly be developed in the future.
This research was conducted in four main phases, literature review and development of a testing plan and three
phases of laboratory testing campaigns. The most commonly available acceptance specification for partial-depth
patching materials is the ASTM C928. This specification was followed and the outcomes of each of the
recommended tests were evaluated in context of the performance of the patching materials. Several additional tests
were developed and conducted to evaluate the bonding properties of patching materials; correlations between lab
measured properties were also evaluated. Through aforementioned testing and analysis, a laboratory testing based
acceptance procedure was developed for partial-depth patching materials to be used by MnDOT.
Minnesota Department of Transportation Research Services Section
Dave, Eshan V.; Dailey, Jay; Musselman, Eric.
Evaluation of Concrete and Mortars for Partial Depth Repairs.
Center for Transportation Studies University of Minnesota.
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