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原文传递 Implementation of Maturity for Concrete Strength Measurement and Pay.

题名：	Implementation of Maturity for Concrete Strength Measurement and Pay.
作者：	Ishak, S.; Osman, O. A.; Codjoe, J.; Jenkins, S.; Karbalaieali, S.; Theriot, M.; Bakhit, P.; Ye, M.
关键词：	Maturity, Concrete, Quality assurance, Non-destructive testing, Curing, Strength relationship
摘要：	The current construction climate continually requires a more rapid response time for concrete form removal, early age strengths, and opening strengths. This project piloted the maturity method on one structural project and one pavement rehabilitation project. As part of the implementation project, district personnel were taught about the use of maturity to determine compressive strength and trained on creating a maturity curve, placing sensors, and validating the curve. Cylinders were cast, cured, and tested in the laboratory to establish a maturity curve for the job mixtures. A total of four maturity curves were developed for this project although only two were used on field implementation projects. The two mixtures used for field implementation included a high supplementary cementitious material structural class mixture that required 3500 psi for form removal and a 4-hour 3000 psi mixture that was used for full-depth patching. The two mixtures not used in field implementation were a slip form paving mixture and an internally cured concrete mixture for use in a bridge deck. The data obtained from the curve formation was accurate but changes in the job mixtures and limited time frames to reestablish the maturity curves deemed their use impossible. Field use showed excellent correlation between the maturity curve and cast validation cylinders. This led to less cylinders having to be produced and less time waiting for form removal strengths. For the concrete rehabilitation, casting cylinders for lane opening time were eliminated and the traffic opening was allowed based solely on maturity readings. The authors recommend incorporating the use of maturity for strength measurement and pay into the standards and specifications for Departmental use.
报告类型：	科技报告