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Alkali-Activated Concrete Based on Natural Volcanic Pozzolan: Chemical Resistance to Sulfate Attack

Aragón, Patricia / Robayo-Salazar, Rafael A. / Mejía de Gutiérrez, Ruby

In this article, a comparative analysis of the sulfate resistance ( ${Na}_{2} {SO}_{4}$ and ${MgSO}_{4}$ ) of an alkali-activated binary concrete (AABC) (70% natural volcanic pozzolan and 30% granulated blast-furnace slag) and a concrete based on ordinary portland cement (OPC) is performed. The AABC and OPC concrete were cured for 28 days prior to their immersion in solutions of sulfates (5% by weight) for a period of up to 730 days. Dimensional changes, compressive strength, absorption, and porosity properties were evaluated at different test ages. Additionally, the level of concrete deterioration was monitored by visual inspection, scanning electron microscopy, and X-ray diffraction (DRX). The results show that the AABC presents resistance to sulfate attack greater than that of OPC. The percentage of expansion to 730-day exposure for AABC was 0.0985% in ${Na}_{2} {SO}_{4}$ with a compressive strength index of $- 0.58 %$ ; in ${MgSO}_{4}$ , these values were 0.1471% and $- 20.85 %$ , respectively. AABC complies with the expansion limit specified by ASTM C1012 for the most severe class of exposure (S3). This finding allows for the classification of the AABC as a high- ${Na}_{2} {SO}_{4}$ -resistant concrete.

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Alkali-Activated Concrete Based on Natural Volcanic Pozzolan: Chemical Resistance to Sulfate Attack

Aragón, Patricia / Robayo-Salazar, Rafael A. / Mejía de Gutiérrez, Ruby

In this article, a comparative analysis of the sulfate resistance ( ${Na}_{2} {SO}_{4}$ and ${MgSO}_{4}$ ) of an alkali-activated binary concrete (AABC) (70% natural volcanic pozzolan and 30% granulated blast-furnace slag) and a concrete based on ordinary portland cement (OPC) is performed. The AABC and OPC concrete were cured for 28 days prior to their immersion in solutions of sulfates (5% by weight) for a period of up to 730 days. Dimensional changes, compressive strength, absorption, and porosity properties were evaluated at different test ages. Additionally, the level of concrete deterioration was monitored by visual inspection, scanning electron microscopy, and X-ray diffraction (DRX). The results show that the AABC presents resistance to sulfate attack greater than that of OPC. The percentage of expansion to 730-day exposure for AABC was 0.0985% in ${Na}_{2} {SO}_{4}$ with a compressive strength index of $- 0.58 %$ ; in ${MgSO}_{4}$ , these values were 0.1471% and $- 20.85 %$ , respectively. AABC complies with the expansion limit specified by ASTM C1012 for the most severe class of exposure (S3). This finding allows for the classification of the AABC as a high- ${Na}_{2} {SO}_{4}$ -resistant concrete.

Alkali-Activated Concrete Based on Natural Volcanic Pozzolan: Chemical Resistance to Sulfate Attack

Aragón, Patricia / Robayo-Salazar, Rafael A. / Mejía de Gutiérrez, Ruby

In this article, a comparative analysis of the sulfate resistance ( ${Na}_{2} {SO}_{4}$ and ${MgSO}_{4}$ ) of an alkali-activated binary concrete (AABC) (70% natural volcanic pozzolan and 30% granulated blast-furnace slag) and a concrete based on ordinary portland cement (OPC) is performed. The AABC and OPC concrete were cured for 28 days prior to their immersion in solutions of sulfates (5% by weight) for a period of up to 730 days. Dimensional changes, compressive strength, absorption, and porosity properties were evaluated at different test ages. Additionally, the level of concrete deterioration was monitored by visual inspection, scanning electron microscopy, and X-ray diffraction (DRX). The results show that the AABC presents resistance to sulfate attack greater than that of OPC. The percentage of expansion to 730-day exposure for AABC was 0.0985% in ${Na}_{2} {SO}_{4}$ with a compressive strength index of $- 0.58 %$ ; in ${MgSO}_{4}$ , these values were 0.1471% and $- 20.85 %$ , respectively. AABC complies with the expansion limit specified by ASTM C1012 for the most severe class of exposure (S3). This finding allows for the classification of the AABC as a high- ${Na}_{2} {SO}_{4}$ -resistant concrete.

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Titel:

Alkali-Activated Concrete Based on Natural Volcanic Pozzolan: Chemical Resistance to Sulfate Attack

Beteiligte:

Aragón, Patricia (Autor:in) / Robayo-Salazar, Rafael A. (Autor:in) / Mejía de Gutiérrez, Ruby (Autor:in)

Erschienen in:

Journal of Materials in Civil Engineering ; 32

Erscheinungsdatum:

04.03.2020

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0003161

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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