United States Department of Transportation
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TRIS Online Accession Number:00962814
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OCLC Number:53345962
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Edition:Brief
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Abstract:When MoDOT repair crews were faced with emergency repair of a heavily damaged overpass on I-70 in December 2002, inspectors looked to the concrete maturity method to facilitate reconstruction operations of one of the structure’s northern bents, which was severely impacted in a tractor-trailer accident. The maturity method, a nondestructive means of estimating in-place concrete strength as a function of time and temperature, is recognized as a more reliable and timely method as opposed to testing conventional 6”x12” compressive strength cylinders. Following placement of the bent footings, columns and cap on the I-70 overpass, thermocouples were inserted in the fresh concrete and a maturity value was calculated at desired times. In-place strength was then estimated from a pre-established relationship between maturity values and compressive strength. Application of the maturity method allowed earlier form removal and completion of the I-70 bridge repairs than if concrete cylinders had been used for strength determination. As a result, the bridge was open to traffic several days earlier than anticipated had conventional methods been used.
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[PDF-1.86 MB]
