Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition

Vázquez Rodríguez, Francisco Javier y Elizondo Villarreal, Nora y Montes González, Myriam y Gómez Rodríguez, Cristian y González Carranza, Yadira y Guzmán Hernández, Ana María y Rodríguez Castellanos, Edén Amaral (2023) Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition. Materials, 16 (10). pp. 1-24. ISSN 1996-1944

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URL o página oficial: http://doi.org/10.3390/ma16103818

Resumen

Concrete is the most used construction material, needing large quantities of Portland cement. Unfortunately, Ordinary Portland Cement production is one of the main generators of CO2, which pollutes the atmosphere. Today, geopolymers are an emerging building material generated by the chemical activity of inorganic molecules without the Portland Cement addition. The most common alternative cementitious agents used in the cement industry are blast-furnace slag and fly ash. In the present work, the effect of 5 wt.% µ-limestone in mixtures of granulated blast-furnace slag and fly ash activated with sodium hydroxide (NaOH) at different concentrations was studied to evaluate the physical properties in the fresh and hardened states. The effect of µ-limestone was explored through XRD, SEM-EDS, atomic absorption, etc. The addition of µ-limestone increased the compressive strength reported values from 20 to 45 MPa at 28 days. It was found by atomic absorption that the CaCO3 of the µ-limestone dissolved in NaOH, precipitating Ca(OH)2 as the reaction product. SEM-EDS analysis showed a chemical interaction between C-A-S-H- and N-A-S-H-type gels with Ca(OH)2, forming (N, C)A-S-H- and C-(N)-A-S-H-type gels, improving mechanical performance and microstructural properties. The addition of µ-limestone appeared like a promising and cheap alternative for enhancing the properties of low-molarity alkaline cement since it helped exceed the 20 MPa strength recommended by current regulations for conventional cement.

Tipo de elemento:

Article

Palabras claves no controlados:

Escoria; Ceniza voladora; µ-piedra caliza; Geopolímero; Compuesto

Materias:

T Tecnología > TA Ingeniería General y Civil

Divisiones:

Ciencias Físico Matemáticas

Usuario depositante:

Editor Repositorio

Creadores:

Creador	Email	ORCID
Vázquez Rodríguez, Francisco Javier	francisco.vazquezrd@outlook.es	orcid.org/0000-0001-5010-9491
Elizondo Villarreal, Nora	NO ESPECIFICADO	orcid.org/0000-0002-1661-7756
Montes González, Myriam	NO ESPECIFICADO	NO ESPECIFICADO
Gómez Rodríguez, Cristian	NO ESPECIFICADO	NO ESPECIFICADO
González Carranza, Yadira	NO ESPECIFICADO	NO ESPECIFICADO
Guzmán Hernández, Ana María	NO ESPECIFICADO	NO ESPECIFICADO
Rodríguez Castellanos, Edén Amaral	NO ESPECIFICADO	NO ESPECIFICADO