Title:
Tensile Creep of Metakaolin-Limestone Powder Ultra-High- Performance Concrete
Author(s):
Rodolfo Bonetti, Oguzhan Bayrak, Kevin Folliard, and Thanos Drimalas
Publication:
Materials Journal
Volume:
120
Issue:
2
Appears on pages(s):
97-103
Keywords:
casting orientation; drying shrinkage; mixture composition; tensile creep; ultra-high-performance concrete (UHPC)
DOI:
10.14359/51738492
Date:
3/1/2023
Abstract:
An investigation was performed on the drying shrinkage and tensile drying creep characteristics of a nonproprietary ultra-high-performance concrete (UHPC) mixture. The mixture was formulated using metakaolin as the supplementary cementitious material (SCM) and limestone powder as the mineral filler. Cylindrical specimens with dimensions of 52 x 400 mm (2.05 x 16 in.) were fabricated and loaded at 7 and 11 days from casting to various stress levels for 90 days. Additional specimens were fabricated from a proprietary
mixture with a silica fume-ground quartz formulation to study the effects of mixture composition. Simultaneous free drying shrinkage measurements were recorded in accompanying specimens placed in the same room environment. Attention was given to the effect of the casting orientation, age at loading, and mixture composition on the drying shrinkage and drying creep behavior of the samples. These tests show that the metakaolin-limestone powder mixture has significantly lower drying shrinkage and specific drying creep than the silica fume-ground quartz mixture. Additionally, the age at loading influences primary creep behavior while not affecting
secondary creep at the same stress level. It seems that fiber orientation plays a significant role in the drying creep behavior of UHPC and that cracked UHPC under constant tensile stress undergoes a significant amount of fiber slip.
Related References:
1. Bažant, Z. P., and Xi, Y., “Drying Creep of Concrete: Constitutive Model and New Experiments Separating Its Mechanisms,” Materials and Structures, V. 27, No. 1, Jan. 1994, pp. 3-14. doi: 10.1007/BF02472815
2. Garas Yanni, V. Y., “Multi-Scale Investigation of Tensile Creep of Ultra-High Performance Concrete for Bridge Applications,” PhD dissertation, Georgia Institute of Technology, Atlanta, GA, 2009, 291 pp.
3. Switek, A. E., “Time-Dependent Response of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) under Low to High Tensile Stresses,” PhD thesis, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 2011, 223 pp. doi: 10.5075/epfl-thesis-4899
4. Bissonnette, B., and Pigeon, M., “Tensile Creep at Early Ages of Ordinary, Silica Fume and Fiber Reinforced Concretes,” Cement and Concrete Research, V. 25, No. 5, July 1995, pp. 1075-1085.
5. Graybeal, B. A., “Material Property Characterization of Ultra-High Performance Concrete,” Report No. FHWA-HRT-06-103, Federal Highway Administration, Turner-Fairbank Highway Research Center, McLean, VA, 2006, 188 pp.
6. Bonetti, R.; Bayrak, O.; Folliard, K.; and Drimalas, T., “A Framework for Determining the Direct Tensile Properties of Ultra-High-Performance Concrete,” ACI Materials Journal, V. 120, No. 2, Mar. 2023, pp. 87-96. doi: 10.14359/51738374
7. Bissonnette, B.; Pigeon, M.; and Vaysburd, A. M., “Tensile Creep of Concrete: Study of Its Sensitivity to Basic Parameters,” ACI Materials Journal, V. 104, No. 4, July-Aug. 2007, pp. 360-368.
8. Neville, A. M.; Dilger, W. H.; and Brooks, J. J., Creep of Plain and Structural Concrete, Construction Press, London, UK, 1983, 361 pp.