Evaluación de la metodología de ensayo acelerado de barras de mortero ASTM C 1260 para detectar agregados potencialmente reactivos y las medidas de mitigación de la reacción álcali-sílice ASTM C 1567

The alkali-silica reaction is defined as a phenomenon produced by the alkalis (sodium or potassium) of the cement, which react with the silica present in certain aggregates, forming a gel that under conditions of humidity generates internal microcracks and stresses. In the present article the result...

Full description

Autores:
Bolívar Murcía, Stefanny
Torres, Nancy
Tipo de recurso:
Article of journal
Fecha de publicación:
2018
Institución:
Escuela Colombiana de Ingeniería Julio Garavito
Repositorio:
Repositorio Institucional ECI
Idioma:
spa
OAI Identifier:
oai:repositorio.escuelaing.edu.co:001/882
Acceso en línea:
http://revistas.escuelaing.edu.co/index.php/reci/article/view/31/27
https://repositorio.escuelaing.edu.co/handle/001/882
Palabra clave:
Resistencia de Materiales
Reacción Alcali Silice
Cemento - Aditivos
Resistencia de materiales
Reacciones álcali-agregados
Alkali-aggregate reactions
Agregados (Materiales de construcción)
Strength of materials
Aggregates (Building materials)
Material resistance
Alkali Silice Reaction
Cement - Additives
Rights
openAccess
License
Derechos Reservados - Escuela Colombiana de Ingeniería Julio Garavito
Description
Summary:The alkali-silica reaction is defined as a phenomenon produced by the alkalis (sodium or potassium) of the cement, which react with the silica present in certain aggregates, forming a gel that under conditions of humidity generates internal microcracks and stresses. In the present article the results of a research project are exposed in which the potential reactivity of three aggregates of the Colombian territory in combination with two types of cements and two water-cement ratios was evaluated, with the ASTM C 1260 bar test. mortar. From the reactive samples, the effectiveness of cementitious materials to mitigate the alkali-silica reaction was evaluated in the ASTM C 1567 mortar bar test. Finally, the mechanical behavior of samples of mortar, such as the resistance to compression, bending and modulus of elasticity, compared to specimens with reactive aggregates was analyzed. and not reactive, concluding that the alkali-silica reaction increases as the aggregate-cement ratio increases and this depends on the mineralogical composition of each aggregate. On the other hand, the mitigating materials used, such as flying ash F, microsilica and metakaolin, are competent to reduce the alkali-silica reaction in a certain proportion of replacement; The mechanical properties most affected by the alkali-silica reaction are the module elastic and flexural strength, and compressive strength is affected in lower percentage over time.