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

Fengqi Guo, Dezhou Li (), Mohammed Nabil, Jiepeng Guo, Ning Zhang and Maofeng Lv
Additional contact information
Fengqi Guo: School of Civil Engineering, Central South University, Changsha 410075, China
Dezhou Li: School of Civil Engineering, Central South University, Changsha 410075, China
Mohammed Nabil: School of Civil Engineering, Central South University, Changsha 410075, China
Jiepeng Guo: School of Civil Engineering, Central South University, Changsha 410075, China
Ning Zhang: Hunan Zhongda Design Institute Co., Ltd., Changsha 410075, China
Maofeng Lv: Railway No. 5 Engineering Group Co., Ltd., Changsha 410100, China

Mathematics, 2024, vol. 12, issue 7, 1-15

Abstract: 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.

Keywords: super-long mass concrete; shrinkage test; strong restraint; segmental length; casting thickness; moulding temperature; restrained expansion rate (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2227-7390/12/7/1078/pdf (application/pdf)
https://www.mdpi.com/2227-7390/12/7/1078/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jmathe:v:12:y:2024:i:7:p:1078-:d:1369279

Access Statistics for this article

Mathematics is currently edited by Ms. Emma He

More articles in Mathematics from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().