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Edition:Final Report (Synthesis Report)
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Abstract:The Tennessee Department of Transportation (TDOT) is administering more early strength requirements due to accelerated project delivery timelines. Therefore, the main objective of the current study was to establish a non-destructive procedure to predict the strength at an early age. For this, the Nurse-Saul maturity function was considered with a datum temperature of 32 oF (0 oC). Locally available materials were collected from East and West areas of Tennessee to produce 8 mixes with 4 types of concrete per TDOT classification, i.e., Class A, D, CP, and X-HES. 4x8 and 6x12 inch cylinders, depending on the TDOT mix class, were prepared to obtain compressive strength at 1, 3, 7, 14, and 28 days. The results revealed that all mixes met the fresh properties (slump, air content, unit weight) and minimum strength requirements. The maturity relationship for each particular class of mix was determined by a logarithmic function from a best fit curve of the strength-maturity data. Field verification of predicted concrete strength was conducted based on the lab-determined strength-maturity relationships at different maturity levels from a commercially available maturity system. For validity of strength-maturity relationship by field data, each logarithmic relationship was plotted along with ±10% boundary conditions and 95% one-sided confidence interval. Field verification results indicated that the strength-maturity relationships can successfully predict the strength at an early age within ±10% boundary conditions. Therefore, the established strength-maturity relationships allow for the prediction of later age strength of different TDOT concrete mixes.
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