Durability of cementitious and geopolymer coating mortars against sulfuric acid attack.

Document Type : Research Article

Authors

Amirkabir University of Technology

Abstract

 Successive deterioration in concrete structures which is caused by the acid attack, has increased the need for substantial and costly repairs to deal with the destruction of concrete structures. Common devastation of water transfer tunnels is due to sulfuric acid attack. One of the ways of maintenance of such structures is to perform the protective coating of the cementitious and geopolymer coating mortars, in which the different features of this coating layer should be studied. In this study, the mechanical properties and durability of geopolymer and cementitious coating mortars containing granulated blast furnace slag and natural pozzolan have been compared. Five cementitious mortar mixtures were prepared with water to binder ratio of 0.32, binder content of 450 kg/m3, and replacement of Portland cement (PC) with 20 and 40% slag and natural pozzolan. 2 geopolymer mortar mixtures with KOH and NaOH as activator were designed. To evaluate their mechanical properties, Compressive strength and tensile adhesion strength were carried out. Also, in order to investigate their durability features against sulfuric acid attack, mortar specimens length Change, compressive strength loss, and weight loss were investigated. According to the results, the use of cement substitute materials (furnace slag and natural pozzolan) reduced the compressive strength by 25%, increased the adhesion strength by 50%, and reduced the length change, weight loss and compressive strength loss of the samples exposed to sulfuric acid. Also, the use of geopolymer mortars had the better performance than the control sample, so that more than 40% increase in compressive strength, about 150% increase in adhesion resistance and approximately 50% decrease in length change and weight loss and compressive strength loss compared to control sample in the sulfuric acid environment. In general, the test results show the proper performance of geopolymer repair mortars in aggressive acidic environments compared to cement-based mortars.

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References

[1] ACI 201.2R-01; Guide to durable concrete, American Concrete Institue (ACI), (2001). 
[2] R.E. Beddoe, H.W. Dorner, Modelling acid attack on concrete: Part I. The essential mechanisms, Cement concrete research, 35(12) (2005) 2333-2339
[3] R. Tixier, B. Mobasher, Modeling of damage in cement-based materials subjected to external sulfate attack. I: Formulation, Journal of materials in civil engineering, 15(4) (2003) 305-313
[4] P. Hewlett, M. Liska, Lea's chemistry of cement and concrete, Butterworth-Heinemann, 2019
[5] N. Fattuhi, B. Hughes, The performance of cement paste and concrete subjected to sulphuric acid attack, Cement Concrete Research, 18(4) (1988) 545-553.
[6] E. Hewayde, M. Nehdi, E. Allouche, G. Nakhla, Effect of mixture design parameters and wetting-drying cycles on resistance of concrete to sulfuric acid attack, Journal of materials in Civil Engineering, 19(2) (2007) 155-163
[7] H.L. Kong, J.G. Orbison, Concrete deterioration due to acid precipitation, Materials Journal, 84(2) (1987) 110-116
[8] N.I. Fattuhi, B.P. Hughes, Ordinary Portland cement mixes with selected admixtures subjected to sulfuric acid attack, Materials Journal, 85(6) (1988) 512-518
[9]. V. Boel, K. Audenaert, G. De Schutter, Acid attack of self compacting concrete, Concrete Repair, Rehabilitation Retrofitting,  (2006) 37.
[10] R. Sersale, G. Frigione, L. Bonavita, Acid depositions and concrete attack: main influences, Cement concrete research, 28(1) (1998) 19-24
[11] K. Kawai, S. Yamaji, T. Shinmi, Concrete deterioration caused by sulfuric acid attack, in:  International Conference on Durability of Building Materials and Components, 2005, pp. 17e20
[12] H. Rahmani, A. Ramazanianpour, Effect of binary cement replacement materials on sulfuric acid resistance of dense concretes, Magazine of concrete research, 60(2) (2008) 145-155.
[13] P. Mehta, Studies on chemical resistance of low water/cement ratio concretes, Cement concrete research, 15(6) (1985) 969-978
[14] J. Monteny, N. De Belie, L. Taerwe, Resistance of different types of concrete mixtures to sulfuric acid, Materials structures, 36(4) (2003) 242-249
[15] Y. Senhadji, G. Escadeillas, M. Mouli, H. Khelafi, Influence of natural pozzolan, silica fume and limestone fine on strength, acid resistance and microstructure of mortar, Powder technology, 254 (2014) 314-323.
[16] T. Bakharev, J.G. Sanjayan, Y.-B. Cheng, Resistance of alkali-activated slag concrete to acid attack, Cement Concrete Research, 33(10) (2003) 1607-1611.
[17] S.A. Bernal, E.D. Rodríguez, R. Mejía de Gutiérrez, J.L. Provis, Performance of alkali-activated slag mortars exposed to acids, Journal of Sustainable Cement-Based Materials, 1(3) (2012) 138-151
[18] N. Rajamane, M. Nataraja, N. Lakshmanan, J. Dattatreya, D. Sabitha, Sulphuric acid resistant ecofriendly concrete from geopolymerisation of blast furnace slag (2012).
[19] ASTM C989 / C989M-18a, Standard Specification for Slag Cement for Use in Concrete and Mortars, ASTM International, West Conshohocken, PA, 2018
[20] ASTM C618-19, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, ASTM International, West Conshohocken, PA, 2019.
[21] ASTM C33, Standard Specification for Concrete Aggregates, ASTM International, West Conshohocken, PA, 2002
[22] ASTM C230, Standard Specification for Flow Table for Use in Tests of Hydraulic Cement, ASTM International, West Conshohocken, PA, 2014
 [23] ASTM C109 / C109M-20a, Standard Test Method for Compressive Strength of Hydraulic Cement Mortars, ASTM International, West Conshohocken, PA, 2020
[24] ASTM D7234-19, Standard Test Method for Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers, ASTM International, West Conshohocken, PA, 2019.
[25] EN 480-5, Admixtures for concrete, mortar and grout. Test methods. Determination of capillary absorption, European Standard (EN), (1997).
[26] ASTM C1012 / C1012M-18b, ASTM International, West Conshohocken, PA, 2018.
[27] A. Ramezanianpour, A. Zolfagharnasab, F. Bahmanzadeh, A. Ramezanianpour, Assessment of high performance concrete containing mineral admixtures under sulfuric acid attack, Amirkabir J Civil Eng, 50 (2018) 121-138.
[28] M. J. Nadoushan and A. A. Ramezanianpour, The Effect of Type and Concentration of Activators on Flowability and Compressive Strength of Natural Pozzolan and Slag-based Geopolymers, Construction and Building Materials 111 (2016): 337-347.
[29] M. J. Nadoushan, A. A. Ramezanianpour,  S. M. Kheirandish,  Mechanical and Durability Properties of Alkali Activated Slag for Sustainable Concrete, Fourth International Conference on Sustainable Construction Materials and Technologies (SCMT4), The University of Navada, Las Vegas, USA  7-11 August 2016
Amirkabir Journal of Civil Engineering
Volume 53, Issue 9
December 2021
Pages 3693-3708

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