Organic phosphorus compounds as heat release regulators in hardening shielding concrete

• Published in: Construction & building materials 2019-06, Vol.209, p.167-175
• Main Authors: Jaskulski, Roman, Glinicki, Michał A., Ranachowski, Zbigniew, Kubissa, Wojciech
• Format: Article
• Language: English
• Subjects: Fresh concrete; Heat release; Image processing; Ionizing radiation; Mass concrete; Nuclear energy; Organic phosphorus compounds; Phosphates; Phosphonates; Phosphorus compounds; Shielding concrete; Temperature gradient
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.03.081

•Phosphorous compounds lower the temperature gradient in hardening shielding concrete.•The lower thermal conductivity of aggregate the higher temperature gradient decrease.•Maximum temperature of hardening shielding concrete stays not affected. The paper presents the results of the study of the influence of the addition of retarding superplasticising admixture based on triisobutyl phosphate and modified phosphonates on the amount of heat generated by hardening shielding concrete. A four-point measurement of the heat generated during the hardening of concrete with an admixture dose of 0, 0.5, 1.0 and 2.0% by weight of the cement was made and the concurrent measurement of the heat released by the hardening cement paste was measured with an isothermal calorimeter. Based on the results from the calorimeter, the effect of the admixture on the temperature field in the hardening concrete mass elements was simulated for different aggregates. The results indicate that the admixture clearly lowers the temperature gradient in hardening mass concrete. In the simulations, the most clear effect was achieved in the case of concrete with barite aggregate, where the gradient value was reduced from 10°C/m to 8°C/m for an admixture content equal to 2.0%.