Traditionally, fabric-reinforced cementitious matrices are brittle matrices, which creates
notable wide cracks and, consequently, limits the effective utilization of the
grid strength of fiber-reinforced polymers(FRPs). To
overcome this challenge, an engineered cementitious composite(ECC) is
introduced as a substitute for the brittle matrix. A novel light-weight and high-strength material suitable
for modern civil engineering applications is developed by incorporating ECC
into a fabric-reinforced cementitious matrix(FRCM) and
FRP grids. The mechanical properties of the composite panels of the FRCM are
examined via uniaxial tensile tests. The investigation focuses on exploring the
impact of FRP types and layers on the mechanical characteristics of FRCM, as well
as their capacity to interact synergistically with ECC materials during its
deformation. Two types of ECC materials, reinforced with different fiber grids,
namely, carbon-fiber-reinforced
polymers and basalt-fiber-reinforced
polymers, are formulated for tensile testing. The tests assess the effects of
the FRP grid layers and the matrix thickness on the composite material
properties. By analyzing the deformation characteristics of the FRP grids and
ECC materials, the effects of the FRP types, layers, and matrix thickness on
the failure mode, initial elastic modulus, strain hardening modulus, crack
initiation stress, peak stress, and strain of the composite materials are
investigated. Under the test conditions, the results reveal the following
trend: the tensile strength of the specimens initially increases with an
increasing number of grid layers, reaching a peak at five layers, and declines
with further addition of layers. Thus, the optimum strength is achieved with
five layers of grids. Although matrix thickness has little effect on the
mechanical behavior of the specimens during the elastic stage, it notably
affects the modulus and peak strength during the strainhardening stage. The strengths and elongation rates of the two types
of FRP grids vary, and their synergistic interaction with short fiber varies as
well.
GUO Caixia
,
ZHOU Bo
,
WANG Guosheng
,
LU Dechun
,
DU Xiuli
.
Uniaxial Tensile Performance of an Engineered Cementitious Composite Reinforced by Carbon and Basalt Textile Grids
[J]. Tunnel Construction, 2024
, 44(10)
: 1950
-1960
.
DOI: 10.3973/j.issn.2096-4498.2024.10.004
