Abstract:
The maturity method is deservedly considered one of the reliable indirect methods for
determining the strength at the early stages of concrete curing. The main parameter in the calculation
is the internal temperature of concrete that accumulates during the chemical reaction of concrete
curing, while external factors such as ambient temperature and relative humidity are fallaciously
omitted. In this work, the complex maturity method was developed based on ASTM C1074, accounting for the influence of ambient temperature and relative humidity and coefficients indicating their
influence weight. The laboratory testing to measure the concrete strength by compression method
and non-destructive sclerometer method were performed on concrete samples according to ASTM
C109, GOST 22690, and GOST 10180. According to the calibration dependence of the existing and
proposed methods results in comparison with the strength of cubic samples, the highest coefficient
of determination R2 = 0.976 was revealed for the complex method of maturity, which indicates its
reliability in contrast with sclerometer and traditional maturity methods. The determination of
complex maturity allows for an evaluation of the current state of concrete strength, but also reduces
the waiting time for concrete curing and increases the economic effect during construction.
