Tensile Creep of Concrete at Early Age

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Title: Tensile Creep of Concrete at Early Age

Author(s): Akthem Al-Manaseer and Rami Zayed

Publication: Materials Journal

Volume: 115

Issue: 5

Appears on pages(s): 769-772

Keywords: early age; I-beam; linear strain; shrinkage; tensile creep

DOI: 10.14359/51706843

Date: 9/1/2018

Abstract:
An experimental study was conducted on unsealed concrete I-beam specimens to investigate early-age tensile creep. The tests were conducted on concrete specimens that were moist-cured for 24 hours. The specimens were loaded at 30% of their tensile failure load and tensile creep was monitored for 72 hours. Companion shrinkage specimens were used to measure drying shrinkage while the tensile creep test was performed. The investigation shows that the magnitude of early-age shrinkage exceeds the tensile creep values. The results showed that combined creep and shrinkage strains were increasing when the applied load was increased.

Related References:

1. Nasser, K. W., and Al-Manaseer, A. A., “Creep of Concrete Containing Fly Ash and Superplasticizer at Different Stress/Strength Ratios,” ACI Journal Proceedings, V. 83, No. 4, July-Aug. 1986, pp. 668-673.

2. ACI Committee 209, “Guide for Modeling and Calculating Shrinkage and Creep in Hardened Concrete (ACI 209.2R-08),” American Concrete Institute, Farmington Hills, MI, 2008, 44 pp.

3. Gardner, N. J., “Design Provisions of Shrinkage and Creep of Concrete,” Adam Neville Symposium: Creep and Shrinkage—Structural Design Effect, SP-194, Akthem Al-Manaseer, ed., American Concrete Institute, Farmington Hills, MI, 2000, pp. 101-104.

4. Altoubat, S., and Lange, D., “Tensile Basic Creep: Measurements and Behavior at Early Age,” ACI Materials Journal, V. 98, No. 5, Sept.-Oct. 2001, pp. 386-393.

5. Østergaard, L.; Lange, D. A.; Altoubat, S. A.; and Stang, H., “Tensile Basic Creep of Early-Age Concrete under Constant Load,” Cement and Concrete Research, V. 31, No. 12, 2001, pp. 1895-1899. doi: 10.1016/S0008-8846(01)00691-3

6. Hauggaard, A. B.; Damkilde, L.; Hansen, P. F.; Hansen, J. H.; Christensen, S. L.; and Nielsen, A., “Control of Early Age Cracking in Concrete,” Phases 3: Creep in Concrete, The Danish Road Directorate, Lyngby, Denmark, 1997, pp. 53-60.

7. Hauggaard, A. B.; Damkilde, L.; Hansen, P. F.; Hansen, J. H.; Christensen, S. L.; and Nielsen, A., “Control of Early Age Cracking in Concrete,” Phases 4 and 5: Material Modelling, Continuum Approach, The Danish Road Directorate, Lyngby, Denmark, 1997, pp. 58-64.

8. Hauggaard, A. B.; Damkilde, L.; and Hansen, P. F., “Transitional Thermal Creep of Early Age Concrete,” Journal of Engineering Mechanics, ASCE, V. 125, No. 4, 1999, pp. 458-465. doi: 10.1061/(ASCE)0733-9399(1999)125:4(458)


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