United States Department of Transportation
i
Implementation of Maturity for Concrete Strength Measurement and Pay: [Research Project Capsule]
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2015-01-01
[PDF-166.15 KB]
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Abstract:Current construction contracts continually require a more rapid response time for form removal, early age strengths, and opening strengths. Concrete maturity can assist the Department in meeting the needs of both the contractor and Department personnel in the fi eld. Maturity is a concept where concrete strength can be non-destructively measured using a relationship between strength and a temperature time factor. In order for maturity to work, a maturity curve must be developed either before the fi rst day’s production, or with the fi rst day’s production. Typically, ASTM C1074 is used and cylinders are cast, cured, and tested in a laboratory setting to determine the relationship for that particular set of materials. Once the curve has been developed (typical to the one shown in Figure 1), subsequent concrete placements are monitored using maturity loggers and once the designated time-temperature factor equivalent to the specifi ed strength is reached, the area is opened up, forms removed, pay is allowed, etc. Maturity is especially benefi cial to both contractors and Department personnel in early age strength requirement types of jobs including rapid patching, emergency bridge repairs, etc.
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