Influence of composite admixtures on the freezing resistance and pore structure characteristics of cemented sand and gravel

L.  Guo; W.  Wang; L.  Zhong; L.  Guo; L.  Wang; M.  Wang; Y.  Guo; P.  Chen

doi:10.3989/mc.2022.16021

Autores/as

L. Guo School of Water Conservancy, North China University of Water Resources and Electric Power - Henan Water Valley Research Institute - Henan Key Laboratory of Water Environment Simulation and Treatment https://orcid.org/0000-0001-8169-1525
W. Wang School of Water Conservancy, North China University of Water Resources and Electric Power https://orcid.org/0000-0002-4954-416X
L. Zhong School of Water Conservancy, North China University of Water Resources and Electric Power - Henan Water Valley Research Institute - Henan Key Laboratory of Water Environment Simulation and Treatment https://orcid.org/0000-0001-6604-2068
L. Guo School of Water Conservancy, North China University of Water Resources and Electric Power - Henan Water Valley Research Institute - Henan Key Laboratory of Water Environment Simulation and Treatment https://orcid.org/0000-0002-9439-6805
L. Wang School of Water Conservancy, North China University of Water Resources and Electric Power - Henan Water Valley Research Institute - Henan Key Laboratory of Water Environment Simulation and Treatment https://orcid.org/0000-0002-1407-3724
M. Wang School of Water Conservancy, North China University of Water Resources and Electric Power https://orcid.org/0000-0002-6072-177X
Y. Guo School of Water Conservancy, North China University of Water Resources and Electric Power https://orcid.org/0000-0002-4017-4131
P. Chen School of Water Conservancy, North China University of Water Resources and Electric Power, https://orcid.org/0000-0001-8406-8026

DOI:

https://doi.org/10.3989/mc.2022.16021

Palabras clave:

Grava y arena cementada, Resistencia al congelamiento, Dimensión fractal, Estructura de poros, Aditivos compuestos

Resumen

La CSG presenta una baja resistencia al congelamiento debido a sus pobres propiedades cementantes. Añadir aditivos es el método principal para mejorarla. Para este artículo, se diseñaron experimentos basados en el método Taguchi y en las características de resistencia al congelamiento y la estructura de los poros de CSG después de añadir aditivos. Tras 20 ciclos hielo-deshielo, disminuyeron la resistencia a compresión y el módulo de elasticidad dinámico de la CSG. La superficie ocupada por los poros más dañinos (>200 nm) aumentaba según los resutlados de RMN, e igualmente aumentaba la dimensión fractal de su estructura en las imágenes SEM. Atendiendo a los indicadores anteriores, se concluyó que la muestra L9 (laurilsulfato sódico, óxido de grafeno, polvo de nanosílice y agente reductor de agua) tiene la mejor resistencia. Se ejecutaron experimentos con L9 para verificar que puede mejorar significativamente la resistencia al congelamiento de los materiales de CSG bajo diferentes dosis de cemento, proporciones de agua/aglutinante y de arena.

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