Quantifying Early-Age Concrete Mechanical Properties and Curing Conditions Utilizing an Automated System
The validation of concrete quality based on the 28-day strength is a lengthy process. Predicting concrete mechanical properties through early-age methods can streamline the construction process. Early-age concrete behavior consists of assessing the concrete curing as-related to setting stages, the hydration process, strength and stiffness development, while considering various environmental system parameters. This paper reports on a nondestructive method for observing the early-age strength and modulus development of concrete mixes over seven days in a controlled, laboratory setting. An apparatus was designed and built for continuous acquisition of seismic modulus data (using free-free resonant column) and heat of hydration/maturity information (derived from ambient air temperature and specimen internal temperature). The experimental design, carried out with the apparatus, represented curing conditions at controlled temperatures (50°F, 70°F, 90°F) and humidity levels (40% and 80%). Two different sources of aggregates, dolomite and gravel, were also considered. An alternative method for quantifying maturity is presented. Concrete samples also underwent compression testing at 1-day, 3-days, and 7-days. The developed apparatus and ensuing analysis method exhibited promising results for predicting the strength from the seismic modulus and maturity over a 7-day period. The heat of hydration, the curing process and the resulting impact on the concrete mechanical properties was also assessed.
Arras, Benjamin, "Quantifying Early-Age Concrete Mechanical Properties and Curing Conditions Utilizing an Automated System" (2019). ETD Collection for University of Texas, El Paso. AAI27546806.