Confinement Mechanism of Basalt TRM-Confined Concrete: The Role of the Mortar Matrix

Data Availability Statement

Acknowledgments

Notation

d

diameter of the concrete core (mm);

E_c

elastic modulus of unconfined concrete (MPa);

E_f

elastic modulus of basalt textile (MPa);

$f_{ce}^{\ast }$, $f_{cc}^{\ast }$, and $f_{cr}^{\ast }$

elastic limit, and peak axial and residual stresses of actively confined concrete (MPa), respectively;

f_cc

compressive strength of confined concrete (MPa);

f_co

compressive strength of unconfined concrete (MPa);

f_l

lateral confining pressure (MPa);

f_mat

characteristic compressive strength of the matrix (MPa);

G_fc

compressive fracture energy of concrete (MPa*mm);

k_m

parameter reflecting the effect of mortar grade on confinement stiffness (dimensionless);

k_mat

coefficient to account for inorganic matrix on hoop rupture strain (dimensionless);

l_c

characteristic length of the specimen in the loading direction, namely, specimen height (mm);

n

number of textile layers (dimensionless);

r and E_s

parameters determining the shapes of stress–strain curves of actively confined concrete in ascending stage;

t_f

nominal equivalent thickness of basalt textile in weft direction (mm);

t_mat

total thickness of the TRM (mm);

u_u

ultimate secant Poisson’s ratio of confined concrete (dimensionless);

α

parameter determining the shapes of stress–strain curves of actively confined concrete in descending stage (dimensionless);

γ_m

material and product partial factor (dimensionless);

Δ and β

parameters to determine the secant Poisson ratio of confined concrete, u_c;

${\epsilon }_{ce}^{\ast }$ and ${\epsilon }_{cc}^{\ast }$

elastic limit strain and axial strain at peak axial stress, $f_{ce}^{\ast }$ (dimensionless);

ɛ_co

axial strain corresponding to unconfined concrete compressive strength f_co (dimensionless);

ɛ_cu

ultimate axial strain of confined concrete (dimensionless);

ɛ_cu,exp and ɛ_cu,pred

experimental and predicted ultimate axial strain of confined concrete (dimensionless);

ɛ_f

ultimate tensile strain of dry fibers (dimensionless);

ɛ_h,rup

hoop rupture strain of confining jacket (dimensionless);

ɛ_l

lateral strain of concrete core (dimensionless);

ɛ_lu

ultimate lateral strain of the concrete core (dimensionless);

η_a

environmental conversion factor (dimensionless);

μ_c0

Poisson's ratio of unconfined concrete (dimensionless);

ρ_k

confinement stiffness ratio (dimensionless);

ρ_mat

matrix reinforcement ratio for confinement (dimensionless);

σ_c and ɛ_c

axial stress (MPa) and axial strain (dimensionless) of the concrete core;

σ_m

axial stresses of shell mortar (MPa); and

σ_max and ɛ_max

maximum tensile stress of BTRM composites (MPa) and corresponding strain (dimensionless).

References