Early age concrete strength measurement: best fit method for the prediction of the minimum vertical concrete elements stripping times
DOI:
https://doi.org/10.4067/S0718-28132017000200006Keywords:
Concrete, Stripping, Maturity, Maturity index, Early age strength measurementAbstract
This article presents a deep study of different methods for early age concrete strength measurement. The goal is the determination of the measuring instrument/ method that best fit the strength-maturity curves in order to determinate minimum vertical concrete stripping times. Compression tests of cylindrical specimens of normal dimensions of 15 x 30 cm as well as of smaller dimensions of 10 x 20 cm were carried out. In addition, concrete sclerometer tests, low resistance sclerometer and penetrometer test were also studied. Two different concrete dosages were used and the experimental data were checked with more than 500 curves points of the maturity curves. It is concluded that the use of pendular sclerometer is recommended when the user wishes stripping with less than 3 MPa of concrete resistance. If it is desired stripping with resistance above this value, it is recommended the use of cylindrical specimens of normal dimensions.
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