Uniaxial tensile behavior and mechanism characterization of multi-scale fiber-reinforced cementitious materials

L.  Li; M.  Cao; Z.  Li; W.  Zhang; D.  Shi; K.  Shi

doi:10.3989/mc.2022.05521

Autores/as

L. Li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University - - College of Water Resources and Architectural Engineering, Northwest A&F University - Faculty of Infrastructure Engineering, Dalian University of Technology - State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0003-3966-6363
M. Cao Faculty of Infrastructure Engineering, Dalian University of Technology https://orcid.org/0000-0002-7917-4710
Z. Li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University - College of Water Resources and Architectural Engineering, Northwest A&F University https://orcid.org/0000-0002-6816-0575
W. Zhang State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0002-9292-2867
D. Shi State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0002-6175-2850
K. Shi School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics https://orcid.org/0000-0001-9513-2679

DOI:

https://doi.org/10.3989/mc.2022.05521

Palabras clave:

Fibra híbrida, Fibra de CaCO3, Material cementosos, Tracción uniaxial, Cálculos, Micro-mecanismos

Resumen

Se han estudiado las propiedades de tracción uniaxial de un material cementante reforzado con fibras multiescala (MSFRCM) de acero, de alcohol polivinílico (PVA) y de carbonato cálcico (CW). Los resultados mostraron que las CW mejoraron la rigidez, la resistencia, la deformación máxima y la tenacidad del material cementoso reforzado con fibra híbrida de acero-PVA sometido a tracción uniaxial. Las CW no solo jugaron un papel relevante en la etapa de bajas deformaciones, sino que también mejoraron la capacidad de retención de carga y la tenacidad del material cementante híbrido reforzado con fibras durante la etapa de deformaciones elevadas. Se han establecido modelos computacionales para evaluar la resistencia a la tracción uniaxial y la tenacidad del MSFRCM, y los resultados coincidieron con los resultados de las pruebas así como de los datos de la literatura. Los estudios microestructurales mostraron que el acero y las fibras de PVA formaron una ITZ débil debido al “efecto pared”. Las CW optimizaron eficazmente la estructura de la ITZ del acero y las fibras de PVA a través de efectos físicos y químicos como relleno, formación de puentes y mejora de la orientación de la Ca(OH)₂. Las fibras de acero, las fibras de PVA y las CW unieron las fisuras de los MSFRCM a nivel macro, meso y microscópico, respectivamente. Como resultado de ello, se observó un efecto de cadena de fibras que mejoró el efecto híbrido positivo entre las fibras multiescala.

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