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.
Highlights
Achieving sufficient concrete strength during the curing time is essential for the continuation of concrete and other construction work
According to [3], the maturity concept serves as an effective way of predicting the early-stage strength, while the authors of [6] stated that the standard cylinder strength underestimated the core strength by more than 40% when concrete curing occurred in cold weather, the maturity method overestimated concrete strength by less than 10%
The purpose of this study is to develop a detailed methodology to calculate the complex maturity, accounting for the external and internal parameters such as internal and ambient temperature and ambient relative humidity, which would weigh the influence ratio of each parameter and most accurately convey the relationship of gained strength with the maturity of concrete over curing time
Summary
Achieving sufficient concrete strength during the curing time is essential for the continuation of concrete and other construction work. Estimation of concrete strength reduces downtime while waiting for strengthening. Works on the maturity method used to estimate the strength of the concrete date from the mid-1950s, by [1,5], who determined the relationship between accumulation of datum temperature and the concrete strength gain. According to [3], the maturity concept serves as an effective way of predicting the early-stage strength, while the authors of [6] stated that the standard cylinder strength underestimated the core strength by more than 40% when concrete curing occurred in cold weather, the maturity method overestimated concrete strength by less than 10%. Ref. [7] proved maturity method’s applicability for mass concrete with large aggregate grain diameters, low cement dosage, and low hydration
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