Mechanical Behaviour of Glass Fibers FRCM and CRM Systems after Ageing in Alkaline Environments

Abstract:

Fabric Reinforced Cementitious Matrix (FRCM) and Composite Reinforced Mortar (CRM) are used in structural strengthening of heritage masonry construction due to their high compatibility with the substrate. Due to the interaction between the reinforcement fibers, made by glass or basalt, and the alkaline matrix, durability problems may be met in the field. In this study a large experimental program is presented and discussed in a synthetic form, with reference to glass fibers reinforcements used in FRCM and CRM systems. Ageing conditions were reproduced in a laboratory environment by immersing the glass-fibre reinforcements into three different solutions. The artificial alkaline solutions used in this study simulated the chemical aggression of lime mortar matrix, Portland cement matrix and standard alkaline solutions (ASTM standard). Four conditioning periods were applied as ageing protocol: 500hrs, 1000hrs, 2000hrs and 3000hrs. Accelerating effects were produced by increasing the temperature during ageing, from 23°C to 40°C and 70°C. The residual mechanical properties and physical damage observed by using Scanning Electronic Microscopy (SEM) are discussed in the paper. The decay of the mechanical properties is highlighted in terms of tensile strength on the whole FRCM strengthening system and for each of the constituents.

• Periodical: Key Engineering Materials (Volume 916)
• Pages: 58-65
• DOI: https://doi.org/10.4028/p-7ztpms
• Online since: April 2022
• Authors: Francesco Micelli*, Valeria Rizzo, Antonio Bonati, Maria Antonietta Aiello
• Keywords: Alkaline, Composite, CRM, Durability, FRCM, Glass Fiber, Reinforcement

References

[1] D. Arboleda,. Fabric Reinforced Cementitious Matrix (FRCM) Composites for Infrastructure Strengthening and Rehabilitation : Characterization Methods., PhD Thesis, 2014, 1–131.

[2] A. Nobili, A, C. Signorini, On the Effect of Curing Time and Environmental Exposure on Impregnated Carbon Fabric Reinforced Cementitious Matrix (CFRCM) Composite with Design Considerations, Comp Part B 112 (2017) 300–313.

DOI: 10.1016/j.compositesb.2016.12.022

[3] J. Donnini, F. De Caso, V. Corinaldesi, G. Lancioni, and A. Nanni, Fabric-Reinforced Cementitious Matrix Behavior at High-Temperature: Experimental and Numerical Results, Comp Part B 108 (2017), 108–21.

DOI: 10.1016/j.compositesb.2016.10.004

[4] A. Nobili, Durability Assessment of Impregnated Glass Fabric Reinforced Cementitious Matrix (GFRCM) Composites in the Alkaline and Saline Environments, Constr Build Mat 105 (2016), 465–71.

DOI: 10.1016/j.conbuildmat.2015.12.173

[5] I. Colombo, M. Colombo, A. Magri, G. Zani, and M. Prisco, Textile Reinforced Mortar at High Temperatures, Appl. Mech. and Mat. 82 (2011), 202–7.

DOI: 10.4028/www.scientific.net/amm.82.202

[6] F. Micelli and M.A. Aiello, Residual Tensile Strength of Dry and Impregnated Reinforcement Fibres after Exposure to Alkaline Environments, Comp Part B: Eng 159 (2019), 490-501.

DOI: 10.1016/j.compositesb.2017.03.005

[7] M.M. Daskiran, E.G. Daskiran, M. Gencoglu, Mechanical and durability performance of textile reinforced cementitious composite panels, Constr. Build. Mat. 264 (2020), 120224.

DOI: 10.1016/j.conbuildmat.2020.120224

[8] K.L. Litherland, D.R. Oakley, B.A. Proctor, The use of accelerated aging procedures to predict the long term strength of GRF composites, Cem Conc Res, 11 (1981), 455-466.

DOI: 10.1016/0008-8846(81)90117-4

[9] American Society for Testing and Materials, ASTM D7705/D7705M - 12. 2015 Standard Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP ) Matrix Composite Bars Used in Concrete Construction, (2015).

DOI: 10.1520/d7705_d7705m

[10] European Committee for Standardization , CEN 1999 EN 1015-11: Methods of Test for Mortar for Masonry - Part 11: Determination of Flexural and Compressive Strength of Hardened Mortar, (2011).

DOI: 10.3403/01905442u

[11] Consiglio Superiore dei Lavori Pubblici, Linea Guida per la identificazione, la qualificazione ed il controllo di accettazione di compositi fibrorinforzati a matrice inorganica (FRCM) da utilizzarsi per il consolidamento strutturale di costruzioni esistenti, Roma, (2018).

DOI: 10.3221/igf-esis.12.04

[12] A. Bentur, Role of Interfaces in Controlling Durability of Fibre-Reinforced Cements, J. Mater. Civ. Eng. 12 (2000), 2–7.

DOI: 10.1061/(asce)0899-1561(2000)12:1(2)