Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30135
Optimum Design of Alkali Activated Slag Concretes for Low Chloride Ion Permeability and Water Absorption Capacity

Authors: Müzeyyen Balçikanli, Erdoğan Özbay, Hakan Tacettin Türker, Okan Karahan, Cengiz Duran Atiş

Abstract:

In this research, effect of curing time (TC), curing temperature (CT), sodium concentration (SC) and silicate modules (SM) on the compressive strength, chloride ion permeability, and water absorption capacity of alkali activated slag (AAS) concretes were investigated. For maximization of compressive strength while for minimization of chloride ion permeability and water absorption capacity of AAS concretes, best possible combination of CT, CTime, SC and SM were determined. An experimental program was conducted by using the central composite design method. Alkali solution-slag ratio was kept constant at 0.53 in all mixture. The effects of the independent parameters were characterized and analyzed by using statistically significant quadratic regression models on the measured properties (dependent parameters). The proposed regression models are valid for AAS concretes with the SC from 0.1% to 7.5%, SM from 0.4 to 3.2, CT from 20 °C to 94 °C and TC from 1.2 hours to 25 hours. The results of test and analysis indicate that the most effective parameter for the compressive strength, chloride ion permeability and water absorption capacity is the sodium concentration.

Keywords: Alkali activation, slag, rapid chloride permeability, water absorption capacity.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1340282

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 493

References:


[1] B. Singh, Ishwarya G., M. Gupta, S.K. Bhattacharyya, Geopolymer concrete: A review of some recent developments, Construction and Building Materials 85 (2015) 78–90.
[2] Shi C, Fernandez-Jiminez A, Palomo A. New cements for the 21st century: the pursuits of an alternative to Portland cement. Cem Concr Res 2002; 32: 865–79.
[3] Guerrieri M. and Sanjayan JG., (2010) “Behavior of combined fly ash/slag-based geopolymers when exposed to high temperatures” Fire and Materials, vol. 3, pp.163–75.
[4] S. Song, D. Sohn, HM. Jennings, TO. Mason, Hydration of alkali-activated ground granulated blast furnace slag, JOURNAL OF Materials Science 35 (2000) 249– 257.
[5] P. K. Mehta, in Proceedings of the 3rd International Conference on Fly Ash, Silica Fume, and Natural Pozzolans in Concrete, Tronheim, Norway, 1989, pp. 1–43.
[6] B. Talling and J. Brandstetr, in Proceedings of the 3rd International Conference on Fly Ash, Silica Fume, and Natural Pozzolans in Concrete, Tronheim, Norway, 1989, p. 1519.
[7] S. D. Wang, Mag. Concr. Res. 43 (1991) 29.
[8] V. D. Glukhovsky, GS. Rostovskaya and GV. Rumyay, in Proceedings of 7th International Congress on the Chemistry of Cement, Paris, 1986, Vol. III, V164–V168.
[9] S. Aydın, A ternary optimisation of mineral additives of alkali activated cement mortars, Construction and Building Materials 43 (2013) 131–138.
[10] Picandet V, Khelidj A and Bellegou H., (2009) “Crack effects on gas and water permeability of concretes” Cement and Concrete Research, vol. 39, pp.537–47.vol. 2, Aug. 1987, pp. 740–741.
[11] Douglas E, Bilodeau A. and Malhotra VM., (1992) “Properties and durability of alkali-activated slag concrete.” ACI Materials Journal, vol. 89(5), pp.509-16.