蒸汽养护混凝土变形行为及开裂风险评估

doi:10.11896/cldb.20120185

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Abstract Through the ultrasonic method, split tensile test, the heat of hydration test and integrated shrinkage-temperature-relative humidity test, elastic modulus, tensile strength, hydration and shrinkage deformation-temperature-relative humidity were studied. Results indicated that steam curing increased the elastic modulus and tensile strength of concrete. High temperature promoted the hydration rate and hydration degree of cement paste. A steam-cured cement paste hydration model was proposed. From steam curing to demoulding stage, the concrete presented an ‘expansion-shrinkage' change law. However, the deformation of steam-cured concrete dominated by drying shrinkage after demoulding. An integrated model of auto-shrinkage and total shrinkage of steam-cured concrete mixed with fly ash and slag after demoulding was proposed. The calculated values of this model are in good agreement with the experimental data. Finally, a cracking evaluation model for steam-cured concrete after demoulding under sealed conditions was proposed. It can be used for quantitative evaluation of crack formation of steam-cured concrete.

Key words： steam curing mixed fly ash and slag hydration model shrinkage model cracking assessment

Published: Online: 2023-01-03

CLC number:

TU377.2

Fund:Sub-subject of the National Key Research and Development Plan of the 13th Five-Year Plan: Assessment of Crac-king Risk and Durability of Typical Concrete Products (2017YFB0310004-05), Key Research and Development Plan of Shandong Province: Low energy consumption manufacturing technology and demonstration application of concrete products (2019GSF110006), and Shandong Province ‘Double First-class' Construction Project-Civil Engineering.

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	Articles by authors
	WANG Penggang
	FU Hua
	GUO Tengfei
	TIAN Li
	ZHAO Tiejun

Cite this article:

WANG Penggang,FU Hua,GUO Tengfei, et al. Deformation Behavior and Cracking Risk Assessment of Steam-cured Concrete[J]. Materials Reports, 2022, 36(24): 20120185-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20120185 OR http://www.mater-rep.com/EN/Y2022/V36/I24/20120185

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