THERMAL SCIENCE

International Scientific Journal

Bing Li

,

Lian-Ying Zhang

,

Yan Li

,

Hui-Guang Yin

,

Rui-Xue Liu

STEPWISE LOADING-UNLOADING CREEP TESTING OF FLY ASH CONCRETE AND ITS CONSTITUTIVE MODEL

ABSTRACT
Stepwise loading-unloading creep testing of concrete with fly ash content of 35%, and 50% was conducted. The time course curve of stepwise creep in fly ash concrete was obtained. Analyses have revealed that it had decelerated creep, constant velocity, and accelerated creep properties. Based on rheological theory, a non-linear viscoelastic-plastic rheological model (MSSB-NVPB) was constructed, and its constitutive relations and creep equations were obtained. Combined with experimental data, the model parameters were determined. The results showed that this model can characterize the creep properties of the fly ash concrete fairly well.
KEYWORDS
creep, MSSB-NVPB model, constitutive equation, concrete with fly ash
PAPER SUBMITTED: 2018-08-20
PAPER REVISED: 2018-11-15
PAPER ACCEPTED: 2019-01-01
PUBLISHED ONLINE: 2019-05-26
DOI REFERENCE: https://doi.org/10.2298/TSCI180820221L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 3, PAGES [1539 - 1545]
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Stepwise loading-unloading creep testing of fly ash concrete and its constitutive model

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