Drying Shrinkage Performance of Ambient Cured Blended Alkali-Activated Concrete

Abstract:

The environmental burden due to the production and use of Ordinary Portland Cement(OPC) has become significant in terms of resource use and atmospheric emissions. Alkali-activatedbinders have gained significant attention in recent years as a possible alternative to OPC. Concreteundergoes physical and chemical changes through its lifetime. These changes affect propertiesresulting in either increase or decrease of performance and serviceability. Concrete contracts due tothese changes leading to shrinkage. Shrinkage induces tensile stresses within the members, whichleads to a tendency of cracking, resulting in compromised durability. Shrinkage behavior analysis ofAlkali-Activated Concrete (AAC), without any external loading, is crucial to assess as there is limiteddata available. To further test for shrinkage under restraint conditions, mix development of AAC isnecessary. Mechanical properties and drying shrinkage potential of AAC are evaluated and comparedwith OPC concrete. Basic properties assessed to understand the performance of AAC are compressivestrength, splitting tensile strength and free drying shrinkage. Drying shrinkage test is performed as perASTM C157 for 90 days. Furthermore, the effect of different curing regimes (dry curing, three daysmoist curing, and seven days moist curing) on the mechanical properties and shrinkage is evaluated.The results show that drying shrinkage of AAC exhibit similar behavior to that of OPC concrete whilehaving better early-age strength under moist curing regimes.

• Periodical: Defect and Diffusion Forum (Volume 394)
• Pages: 109-114
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.394.109
• Online since: August 2019
• Authors: Fatima Yousuf, M. Talha Junaid*, Salah Al-Toubat
• Keywords: Alkali-Activated Concrete, Curing, Drying Shrinkage, Fly Ash, GGBFS

References

[1] M. Taylor, C. Tam, D. Gielen, Energy efficiency and CO2 emissions from the global cement industry. Korea, 2006. 50(2.2) p.61.7.

[2] M. B. Ali, R. Saidur, M. S. Hossain, A review on emission analysis in cement industries, Renew. Sustain. Energy Rev. 15(5) (2011) 2252-2261.

DOI: 10.1016/j.rser.2011.02.014

[3] V. Hoenig, H. Hoppe, B. Emberger, Carbon capture technology-options and potentials for the cement industry, PCA R&D Serial, (3022) (2007).

[4] A. P. Gursel, et al. Life-cycle inventory analysis of concrete production: a critical review, Cem. Concr. Compos. 51 (2014) 38-48.

[5] J. L. Provis, Alkali-activated materials, Cem. Concr. Res. 114 (2018) 40-48.

[6] K. H. Yang, J. K. Song, K. I. Song, Assessment of CO 2 reduction of alkali-activated concrete, J. Clean. Prod. 39 (2013) 265-272.

[7] B. C. McLellan, et al. Costs and carbon emissions for geopolymer pastes in comparison to ordinary portland cement, J. Clean. Prod. 19(9 10) (2011) 1080-1090.

DOI: 10.1016/j.jclepro.2011.02.010

[8] Y. Ding, J. G. Dai, C. J. Shi, Mechanical properties of alkali-activated concrete: A state-of-the-art review, Constr. Build. Mater. 127 (2016) 68-79.

[9] K. Dombrowski, A. Buchwald, M. Weil, The influence of calcium content on the structure and thermal performance of fly ash based geopolymers, J. Mater. Sci. 42(9) (2007) 3033-3043.

DOI: 10.1007/s10853-006-0532-7

[10] J. Temuujin, A. V. Riessen, R. Williams, Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes, J. hazardous mater. 167(1-3) (2009) 82-88.

DOI: 10.1016/j.jhazmat.2008.12.121

[11] T. Phoo-ngernkham, et al. The effect of adding nano-SiO 2 and nano-Al 2 O 3 on properties of high calcium fly ash geopolymer cured at ambient temperature, Mater. Des. 55 (2014) 58-65.

DOI: 10.1016/j.matdes.2013.09.049

[12] S. Riahi, A. Nazari, The effects of nanoparticles on early age compressive strength of ash-based geopolymers, Ceramics Int. 38(6) (2012) 4467-4476.

DOI: 10.1016/j.ceramint.2012.02.021

[13] J. Wongpa, et al. Compressive strength, modulus of elasticity, and water permeability of inorganic polymer concrete, Mater. Des. 31(10) (2010) 4748-4754.

DOI: 10.1016/j.matdes.2010.05.012

[14] A. M. Neville, J. J. Brooks, Concrete technology, (1987).

[15] P. S. Deb, P. Nath, P. K. Sarker, Drying shrinkage of slag blended fly ash geopolymer concrete cured at room temperature, Procedia Eng. 125 (2015) 594-600.

DOI: 10.1016/j.proeng.2015.11.066

[16] A. Castel, et al. Creep and drying shrinkage of a blended slag and low calcium fly ash geopolymer Concrete, Mater. Structures, 49(5) (2016) 1619-1628.

DOI: 10.1617/s11527-015-0599-1

[17] M. T. Junaid, et al. A mix design procedure for low calcium alkali activated fly ash-based concretes, Constr. Build. Mater. 79 (2015) 301-310.

DOI: 10.1016/j.conbuildmat.2015.01.048