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Effect of Carbon-Free Fly Ash and Ground Granulated Blast-Furnace Slag on Compressive Strength of Mortar under Different Curing Conditions

Authors: Abdul Khaliq Amiri, Shigeyuki Date

Abstract:

This study investigates the effect of using carbon-free fly ash (CfFA) and ground granulated blast-furnace slag (GGBFS) on the compressive strength of mortar. The CfFA used in this investigation is high-quality fly ash and the carbon content is 1.0% or less. In this study, three types of blends with a 30% water-binder ratio (w/b) were prepared: control, binary and ternary blends. The Control blend contained only Ordinary Portland Cement (OPC), in binary and ternary blends OPC was partially replaced with CfFA and GGBFS at different substitution rates. Mortar specimens were cured for 1 day, 7 days and 28 days under two curing conditions: steam curing and water curing. The steam cured specimens were exposed to two different pre-curing times (1.5 h and 2.5 h) and one steam curing duration (6 h) at 45 °C. The test results showed that water cured specimens revealed higher compressive strength than steam cured specimens at later ages. An increase in CfFA and GGBFS contents caused a decrease in the compressive strength of mortar. Ternary mixes exhibited better compressive strength than binary mixes containing CfFA with the same replacement ratio of mineral admixtures.

Keywords: Carbon-free fly ash, compressive strength, ground granulated blast-furnace slag, steam curing, water curing.

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References:


[1] R. J. Detwiler, J.I. Bhatty, S. Bhattacharja “Supplementary Cementing Materials for Use in Blended Cements, Research and Development Bulletin Rd112T, Portland cement Association, Skokie, Illinois, U.S.A, 1996 , pp. 15–64.
[2] T. Ayub, S.U. Khan, F.A. Memon, 2014. Mechanical characteristics of hardened concrete with different mineral admixtures: a review. Sci. World J.2014. https://doi.org/10.1155/2014/875082
[3] J.M. Ortega, M.D. Esteban, I. Sánchez, M.Á. Climent, Performance of Sustainable Fly Ash and Slag Cement Mortars Exposed to Simulated and Real In Situ Mediterranean Conditions along 90 Warm Season Days. Materials 2017, 10, 1254.
[4] M.M. Johari, J.J. Brooks, S. Kabir, P. Rivard. Influence of supplementary cementitious materials on engineering properties of high strength concrete. Construction and Building Materials 25 (2011) 2639–2648
[5] C. Meyer, The greening of the concrete industry. Cement Concr. Compos.2009,31(8),601-605.https://doi.org/10.1016/j.cemconcomp.2008.12.010.
[6] S.K. Bremseth, Fly ash in concrete A literature study of the advantages and disadvantages COIN Project report 18-2010 (Sintef Building and Infrastructure, Blindern, 2009)
[7] J. Liu, D. Wang, Application of Ground Granulate Blast Furnace Slag-Steel Slag Composite Binder in a Massive Concrete Structure under Severe Sulphate Attack, Advances in Materials Science and Engineering, 2017, https://doi.org/10.1155/2017/9493043
[8] D.M. Roy, G.M. Idorn, Hydration, structure and properties of blast-furnace slag cements, mortars and concrete, ACI J. Proc. 79 (6) (1982) 445–457.
[9] R.A. Rivera, M.Á. Sanjuán, D.A. Martín, Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Optimization. Sustainability 2020, 12, 5783.
[10] K.H. Yang, Y.B. Jung, M.S. Cho, S.H. Tae, Effect of supplementary cementitious materials on reduction of CO2 emissions from concrete, J. Clean. Prod. 103 (2015) 774-783
[11] D. S. Shen, Z. E. Mao, High Quality Fly Ash Concrete, Shanghai Science & Technology Press, China 1992, pp. 54–57
[12] S. Kashima, N. Furuya, R. Yamaoka, High-Strength Concrete for Wall Foundation Using Ternary Blended Cement with Intermixture of Blast-Furnace Slag and Fly Ash. Fly Ash, Silica Fume, Slag, & Natural Pozzolans in Concrete, Proceedings 4th CANMET/ACI International Conference; Istanbul, Turkey, Vol. 2, 1992, 1451-1469
[13] P. Nath, P. Sarker, Effect of fly ash on the durability properties of high strength concrete, Procedia Eng., 14 (2011), pp. 1149-1156
[14] H. Zhao, W. Sun, X. Wu, B. Gao, 2015. The properties of the self-compacting concrete with fly ash and ground granulated blast furnace slag mineral admixtures. J. Clean. Prod. 95, 66e74. https://doi.org/10.1016/j.jclepro.2015.02.050.
[15] M.C. Alonso, J.L. García Calvo, M. Sánchez, A. Fernandez, Ternary mixes with high mineral additions contents and corrosion related properties, Mater. Corros., 63 (12) (2012), pp. 1078-1086