Expansion And Creep Of Concrete With Expansive Agents At Variable Temperature

Abstract

Extensive research has shown that expansive agents can reduce engineering cracks of concrete, while temperature and creep significantly affect the ability of the expansive agent to compensate shrinkage of concrete. In order to study the expansion and creep of concrete mixed with expansive agents under variable temperature, Series of parameters of concrete mixed with MgO expansive agent (MEA) and CaO-calcium sulfoaluminate expansive agent (CEA) were tested by temperature stress testing machine (TSTM), and the elastic modulus, expansion and creep were calculated according to the maturity theory. The results showed that CEA had a larger free expansion but smaller constrained expansion compared to MEA, and the expansion energy of CEA almost completely released within 36 h of the temperature-rise stage. MEA had a smaller compressive stress creep in the temperature-rise stage and larger tensile stress creep in the cooling stage, which was beneficial to resistance to cracking. The proposed expansion kinetics model showed a remarkable level of consistency with the test results and held significant importance in guiding the application of MEA in practical engineering.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

National Key Research and Development Program of China, Grant 2022YFC3803102

Keywords and Phrases

CaO-Calcium sulfoaluminate expansive agent; Concrete cracking; Creep; MgO expansive agent; Temperature stress testing machine

International Standard Serial Number (ISSN)

2352-7102

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

15 Jun 2024

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