Comparison of thermal cracking potential evaluation criteria for mass concrete structures

Abstract

This paper systematically investigated experimental thermal cracking potential evaluation results of mass concrete structures undergoing external restraint using different criteria (i.e., second-zerostress temperature, cracking temperature, ratio of tensile stress to tensile strength). Results showed that the second-zero-stress temperature is not accurate for the thermal cracking potential evaluation. A modified criterion using the ratio of tensile stress to tensile strength combining the facture energy (i.e., the final value of ratio of tensile stress to tensile strength) is more intuitive on the thermal cracking potential evaluation. The criterion using the cracking temperature is appropriate for the thermal cracking potential evaluation on material level. A proposed criterion combining the cracking temperature and the cracking age obtained from a temperature stress testing machine is more effective for the thermal cracking potential evaluation on material and member level.

Investigation into the seamless construction for hundred-meter scale super-length raft structure based on magnesia expansive agent concrete

“…Within the realm of contemporary construction engineering, the utilization of mass concrete edifices is progressively pervasive, encompassing the raft foundations of ultra-tall structures, piers of substantial bridges, dams, and so forth (Ming et al, 2022). Owing to the considerable structural dimensions and the immense quantity of concrete casting associated with these projects, a multitude of challenges frequently arise during the construction phase, one notable issue being the formation of thermal cracks (Xin et al, 2021).…”

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

“…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].…”