Stiffness Degradation of Textile-Reinforced Mortar under Unloading–Reloading Tensile Cycles
Publication: Journal of Composites for Construction
Volume 27, Issue 1
Abstract
Textile-reinforced mortar (TRM) has proved to be a valid engineering material for the upgrading and retrofitting of existing masonry and concrete structures subject to seismic actions, because it can be applied in thin layers that can increase load-bearing capacity while providing significant durability. However, characterization activities at the composite scale have mainly focused on the material’s monotonic behavior and few studies have so far addressed the material’s performance in the presence of cyclic actions. In this work, we set ourselves the goal of investigating the uniaxial tensile behavior of a series of cement-based matrix composites reinforced with alkali-resistant (AR) glass fabrics, also considering the possible inclusion of short dispersed polyvinyl alcohol (PVA) fibers. Quantification of the stiffness degradation accumulated by the composites during unloading–reloading cycles allowed us to evaluate the damage evolution in uniaxial tension through data interpolation, providing analytical formulations that may represent a benchmark for the validation of advanced nonlinear simulations.
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Acknowledgments
The authors acknowledge Gavazzi Tessuti Spa and Master Builder Solution Italia for their precious contribution to the research. The research was financially supported by RELUIS WP14 – 2019/2021.
Notation
The following symbols are used in this paper:
- a, b, c
- nondimensional parameters (output of regression procedure);
- c min
- minimum value of nondimensional parameter c;
- D(ɛtot)
- tensile damage evolution;
- D i
- tensile damage at ith loop;
- E c
- elastic modulus of mortar;
- E c1
- average initial elastic modulus of composite;
- E glass
- elastic modulus of AR glass filaments;
- f cc
- average cubic compressive strength of mortar;
- f ctf
- average flexural tensile strength of mortar;
- K(ɛtot)
- composite stiffness evolution;
- K i
- composite stiffness at ith loop;
- L 0
- free length of TRM specimen;
- P
- tensile force measured by load cell;
- P avg,max
- average of ultimate tensile loads of specific sample set;
- P max
- ultimate tensile load;
- R 2
- coefficient of determination;
- S(ɛtot)
- crack spacing evolution;
- S 0
- constant representing initial length of specimen;
- S 1
- crack spacing at saturation;
- t
- thickness of composite sample;
- t eq
- equivalent thickness of AR glass fabric;
- V f
- volume fraction of short PVA fibers;
- w
- width of composite sample;
- α
- constant representing rate of crack formation;
- Δδ
- stroke increment;
- δ
- displacement of actuator head (stroke);
- ɛ cr
- axial strain at first crack formation;
- irreversible component of axial strain at ith loop;
- ɛ tot
- total axial strain (COD/GL);
- ɛ tot,i
- total axial strain at ith loop;
- ɛ u
- average experimental axial strain at failure of TRM sample;
- η f
- efficiency parameter of AR glass fabric;
- σ cr
- nominal tensile stress in TRM composite at first crack formation;
- σ i
- maximum stress at ith loop; and
- σ TRM
- nominal tensile stress in TRM composite.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 27 • Issue 1 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 4, 2022
Accepted: Aug 6, 2022
Published online: Oct 21, 2022
Published in print: Feb 1, 2023
Discussion open until: Mar 21, 2023
ASCE Technical Topics:
- Building materials
- Chemical degradation
- Chemical processes
- Chemistry
- Composite materials
- Concrete
- Engineering materials (by type)
- Environmental engineering
- Fiber reinforced composites
- Fiber reinforced concrete
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Mortars
- Stiffening
- Structural behavior
- Structural engineering
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