Materiales de Construcción, Vol 59, No 293 (2009)

Kinetic and morphological differentiation of ettringites in plain and blended Portland cements with metakaolin and the ASTM C 452-68 test. Part II: Morphological differentiation by SEM and XRD analysis


https://doi.org/10.3989/mc.2009.30805

R. Talero
Instituto de Ciencias de la Construcción “Eduardo Torroja”, CSIC, Spain

Abstract


The same cementitious materials (OPCs, SRPCs and matekaolin, MK), the same blended cements and the same ASTM C 452-68 test than in Part I, were used. Other complementary determinations were: chemical analysis of cementing materials, SEM and XRD analysis of ettringites and specific properties of some cement tested and of their pastes.

The experimental results have also demonstrated that when 7.0% SO3, equivalent to 15.05% of gypsum, was added to the M pozzolan-containing Portland cement and tested with the ASTM C 452-68 method, it was not found to behave aggressively but rather as “setting regulator ”, because the increase in mechanical strengths over time and setting times in these mixes were, therefore, similar to the pattern observed in any PC. However, when the gypsum content was raised to triple than that amount (21.0% SO3), it behaved aggressively. In both cases, logically, ettringite from both origins were involved in the resulting beneficial or adverse behavior.

Keywords


metakaolín; Portland cements; gypsum attack; ettringites; rates formation; size

Full Text:


PDF

References


(1) Talero, R.: “Kinetic and morphological differentiation of ettringites in plain and blended Portland cements using metakaolin, and the ASTM C 452-68 test: Part I: kinetic differentiation”. Mater. Construcc. 292, vol. 58 (2008), pp. 45-68. doi:10.3989/mc.2008.30805

(2) ASTM C 452-68 Standard: “Standard Test Method for Potential Expansion of Portland Cement Mortars Exposed to Sulfate”. Annual Book of ASTM Standards. Part 9, Cement; Lime; Gypsum (1968), pp. 298-300.

(3) Moya, S.; Sanz, J.; Serratosa, J. M.; Madani, A.; Aza, S.: “Aluminum-27 and Silicon-29 Magic Angle Spinning Nuclear Magnetic Resonance Study of the Kaolinite-Mullite Transformation”. J. Am. Ceram. Soc., vol. 71, nº 10 (1988), pp. C-418-C-421.

(4) Talero, R.: “Comparative XRD Analysis Ettringite Originating from Pozzolan and from Portland Cement”. Cem. Concr. Res., vol. 26, nº 8 (1996), pp. 1277-1283. doi:10.1016/0008-8846(96)00092-0

(5) Talero, R.: “Contribution to the Analytical and Physical-Chemistry Study of the Ternary System: Pozzolanic Cements-Gypsum-Water”. Tesis Doctoral. Universidad Complutense de Madrid, Madrid, (1986).

(6) Talero, R.: “Sulfate Resistance of Portland Cements. Accelerated Test to Determine it: Specifications”. Monograph nº 399, Instituto C.C. “Eduardo Torroja” (1989).

(7) Talero, R.: “Kinetochemical and Morphological Differentiation of Ettringites by the Le Chatelier-Ansttet Test”. Cem. Concr. Res., vol. 32 (2002), pp. 707-717. doi:10.1016/S0008-8846(01)00749-9

(8) Talero, R.: “Performance of the Metakaolin and Portland Cements Forming Ettringite: Kinetic and Morphological Differences”. 11th Intern. Congress on the Chemistry of Cement, 11-16 mayo de 2003, Durban, South Africa, vol. 2, pp. 853-867.

(9) Talero, R.: “Kinetochemical and Morphological Differentiation of Ettringites by Metakaolin, Portland Cements and the Le Chatelier-Ansttet Test. Parameter: Vicat Needle Penetration”. Silicates Industriels, vol. 68, nums. 11-12, nov.-dic. 2003, pp. 137-146.

(10) Talero, R.: “Performance of Metakaolin and Portland Cements in Ettringite Formation as Determined by ASTM C 452-68: Kinetic and Morphological Differences”. Cem. Concr. Res., vol. 35 (2005), pp. 1269-1284. doi:10.1016/j.cemconres.2004.10.002

(11) Talero, R.; Bollati, M. R.; Hernández-O., F.: “Manufacturing Non-traditional Mortars and Concretes by OPC, Metakaolin and Gypsum (15.05%)”. Mater. Construcc. 256, vol. 49 (1999), pp. 29-41.

(12) Eitel, W.: “Recent Investigations of the System: Lime-Alumina-Calcium Sulfate-Water and its Importance in Building Research Problems”. Journal of Am. Concr. Inst., vol. 28, nº 7 (1957), pp. 679-698.

(13) ASTM C 595M-95 Standard: “Standard Specification for Blended Hydraulic Cements”. Annual Book of ASTM Standards, Sec. 4 Construction, vol. 04.01, Cement; Lime; Gypsum (1995), pp. 291-296.

(14) EN 196-5 Standard: “Instrucción para la Recepción de Cementos RC-97 (R.D. 776/1997, de 30 de mayo). Pliego de Prescripciones Técnicas Generales para la Recepción de Cementos RC-75 (BOE nº 206 de 28 de agosto de 1975)”. Frattini, N.: Ann. Chim. Applicata, vol. 39 (1949), pp. 616-620.

(15) EN 196-1:1996 Standard: “Métodos de ensayo de cementos. Parte 1: Determinación de resistencias mecánicas (Mechanical Strengths Determination)”. AENOR, Madrid.

(16) EN 196-3:1996 Standard: “Métodos de ensayo de cementos. Parte 3: Determinación del tiempo de fraguado (Setting Times Determination) y estabilidad de volumen (Volume Stability Determination-Le Chatelier’s Needles).” AENOR, Madrid.

(17) Von Weimarn, P.; Walton, H. F. (ed.): Principles and Methods of Chemical Analysis, Prentice-Hall, New York (1952), p. 21.

(18) Garrido, J.: Forma y estructura de los cristales, Editorial Alhambra (1973), p. 76.

(19) Talero, R.; Bollati, M. R.: Private Official Report (1990).

(20) Mather, K.: “Factors affecting sulfate resistance of mortars”. Proceedings 7th Intern. Congress on the Chemistry of Cement, Paris, vol. 5 (1980), pp. 580-585.

(21) Metha, P. K.: “Effect of Fly Ash Composition on Sulfate Resistance of Cement”. J. Am. Concr. Inst., vol. 83, nº 6 (1986), pp. 994-1000.

(22) Tikalsky, P. J.; Carrasquillo, R. L.: “Influence of Fly Ash on the Sulfate Resistance of Concrete. ACI Journal Materials (ACI Structural Journal), vol. 89, nº 1 (1992), pp. 69-75.

(23) ASTM C 150-95 Standard: “Standard Specification for Portland Cement”. Annual Book of ASTM Standards. Sec. 4 Construction, vol. 04.01, Cement; Lime; Gypsum (1995), pp.128-132.

(24) ASTM 845-90 Standard: “Standard Specification for Expansive Hydraulic Cement”. Annual Book of ASTM Standards. Sec. 4 Construction, vol. 04.01, Cement; Lime; Gypsum (1995), pp. 391-393.




Copyright (c) 2009 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Contact us materconstrucc@ietcc.csic.es

Technical support soporte.tecnico.revistas@csic.es