Assessing the zero-stress temperature in high performance concrete at early age

Predicting early‐age stress evolution in restrained concrete by thermo‐chemo‐mechanical model and active ensemble learning

“…The results show that the first PC represents the global magnitude of the whole EAS vector, irrespective of whether the specimen is in compression or in tension. Compared with other indexes like “zero‐stress temperature” (Dabarera et al., 2022), “peak of compressive stress” (Bentz et al., 2008), and “peak of tensile stress” (Shen et al., 2019), which are mostly based on a single observation at a single time point, the first PC represents an overall characteristic of the whole EAS vector and can be regarded as a global index for evaluating the EAS evolution.…”

Evaluation of zero-stress temperature and cracking temperature of high performance concrete at early ages

“…2.2 Cracking temperature Through the analysis above, the improved model to determine the total stress (Eq. ( 1)) induced by restrained total strain under an actual temperature profile (T) can be presented as [10]:…”

“…Following the authors' previous studies [5,10,17,29], a concrete mix with water-to-binder ratio (w/b) of 0.25 (see Table 1) was studied to demonstrate the determination and evolution of T z and T x profiles in this paper.…”

“…1d). According to [7][8][9][10], the concrete temperatures corresponding to the zero stress and the cracking stress are the zero-stress temperature (T z ) and the cracking temperature (T x ), as marked in Fig. 1a.…”

“…While measurements of T z and T x of early-age concrete had been reported in the past studies [7][8][9][10][11][12], there remain no appropriate numerical models for the two temperatures. In this paper, an attempt has been made to model the evolutions of the two temperatures at early ages based on substantial previous studies performed by the authors [5,10,13]. Both the theoretical basis and practical significance of predicting T z and T x were presented and justified.…”