Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases
The application of reinforced concrete has been used in various engineering and architecture fields. Stress relaxation and creep are two crucial time-dependent behaviours of concrete. The influence of two behaviours is closely related to the service life of the reinforced concrete structure. However...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522006945 |
| _version_ | 1797985790564761600 |
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| author | Zhiwei Qu Ruizhe Si Pengjiao Jia Yingda Zhang |
| author_facet | Zhiwei Qu Ruizhe Si Pengjiao Jia Yingda Zhang |
| author_sort | Zhiwei Qu |
| collection | DOAJ |
| description | The application of reinforced concrete has been used in various engineering and architecture fields. Stress relaxation and creep are two crucial time-dependent behaviours of concrete. The influence of two behaviours is closely related to the service life of the reinforced concrete structure. However, the research on experimental relaxation behaviour has rarely been extensively studied because of the complicated procedures. Meanwhile, fly ash is commonly utilised to partially replace cement to reduce the greenhouse effect. As a result, this study is committed to examining the creep and relaxation behaviour of fly ash concrete. The concrete creep and relaxation tests were designed to maintain a constant stress and strain levels, respectively. The creep and relaxation tests were conducted at the same time to minimise the shrinkage and ageing effects. The stress and strain levels were selected as 20% and 60% of concrete compressive strength to investigate creep and relaxation in linear and nonlinear cases. By comparing computed values of relaxation from the inverse of the compliance function, the estimated relaxation function showed good agreement using the inverse of the compliance function. However, the existing creep model showed a difference in predicting the creep of fly ash concrete. As a result, the existing model is amended to improve the estimation of creep and relaxation of fly ash concrete. |
| first_indexed | 2024-04-11T07:22:35Z |
| format | Article |
| id | doaj.art-db967a06ce2142a4b28820e9e41ca235 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-11T07:22:35Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-db967a06ce2142a4b28820e9e41ca2352022-12-22T04:37:09ZengElsevierCase Studies in Construction Materials2214-50952022-12-0117e01562Creep and relaxation responses of fly ash concrete: Linear and nonlinear casesZhiwei Qu0Ruizhe Si1Pengjiao Jia2Yingda Zhang3School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, PR China; Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, NSW 2052, AustraliaInstitute of Civil Engineering Materials, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, PR ChinaSchool of Urban Rail Transportation, Soochow University, Suzhou 215131, PR ChinaSchool of Architecture and Civil Engineering, Xihua University, Chengdu 610039, PR China; Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, NSW 2052, Australia; Corresponding author.The application of reinforced concrete has been used in various engineering and architecture fields. Stress relaxation and creep are two crucial time-dependent behaviours of concrete. The influence of two behaviours is closely related to the service life of the reinforced concrete structure. However, the research on experimental relaxation behaviour has rarely been extensively studied because of the complicated procedures. Meanwhile, fly ash is commonly utilised to partially replace cement to reduce the greenhouse effect. As a result, this study is committed to examining the creep and relaxation behaviour of fly ash concrete. The concrete creep and relaxation tests were designed to maintain a constant stress and strain levels, respectively. The creep and relaxation tests were conducted at the same time to minimise the shrinkage and ageing effects. The stress and strain levels were selected as 20% and 60% of concrete compressive strength to investigate creep and relaxation in linear and nonlinear cases. By comparing computed values of relaxation from the inverse of the compliance function, the estimated relaxation function showed good agreement using the inverse of the compliance function. However, the existing creep model showed a difference in predicting the creep of fly ash concrete. As a result, the existing model is amended to improve the estimation of creep and relaxation of fly ash concrete.http://www.sciencedirect.com/science/article/pii/S2214509522006945Fly ash concreteCreepRelaxation behaviourCreep model |
| spellingShingle | Zhiwei Qu Ruizhe Si Pengjiao Jia Yingda Zhang Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases Case Studies in Construction Materials Fly ash concrete Creep Relaxation behaviour Creep model |
| title | Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases |
| title_full | Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases |
| title_fullStr | Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases |
| title_full_unstemmed | Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases |
| title_short | Creep and relaxation responses of fly ash concrete: Linear and nonlinear cases |
| title_sort | creep and relaxation responses of fly ash concrete linear and nonlinear cases |
| topic | Fly ash concrete Creep Relaxation behaviour Creep model |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522006945 |
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