Quantifying maximum temperature in 17 mass concrete cube specimens made with mixtures including metakaolin and/or slag

Hamid, Hiwa; Chorzepa, Mi G.

doi:10.1016/j.conbuildmat.2020.118950

Cited by 16 publications

(1 citation statement)

References 10 publications

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“…In the process of mass concrete pouring, the cement hydration degree is high and the shrinkage has rapid development and large shrinkage, which are some of the important causes of cracks in the structure. The generation of cracks worsens the mechanical properties and durability of the components and affects the safety of the structure [1][2][3][4]. The shrinkage mechanism and crack resistance of mass concrete under dry conditions were studied, with the belief that the early shrinkage of mass concrete was larger, which would cause greater tensile stress [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Segmental Casting Length of Strongly Restrained Super-Long Mass Concrete Based on Crack Resistance

Guo,

Li,

Nabil

et al. 2024

Mathematics

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The cracking of ultra-long and large concrete structures with strong constraints is a key issue under the action of shrinkage and hydration heat. The length of section pouring during construction is one of the main parameters to control the cracking of concrete. In this paper, the shrinkage test of concrete specimens under the condition of coculture is carried out under the background of the landing gear slide test platform of large aircraft. The measured early shrinkage curve of the expanded concrete is obtained, and the finite element model is established. The effects of the casting thickness, mould temperature, and limited expansion rate on the stress and cracking of super-long and large concrete are studied. The results show that factors such as the casting thickness, mould temperature, and limited expansion rate have significant effects on the limited length of the section after pouring. When the casting thickness is increased by 200%, the limit of the section length is reduced by 42%. When the mould temperature increases by 66.7%, the section length limit decreases by 28.2%, while the value increases by 24.2%, with an increasing expansion rate of 75%. The relationship between the three parameters and the piecewise pouring length is approximately linear. The exact calculation of the section length limit of strongly constrained ultra-long mass concrete under different pouring thicknesses, mould temperatures, and limited expansion rates is derived, and a simplified calculation formula is also proposed through data regression analysis. The errors between them are less than 1.7%, which provides a basis for calculating the section length of strongly constrained ultra-long mass concrete construction.

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