Low-to-normal strength inorganic matrices with 10–45 MPa compressive strength typically have been utilized when the FRCM systems are used toward external strengthening of the masonry elements such as masonry walls (Caggegi et al., 2017 Carozzi et al., 2017 Leone et al., 2017 Koutas et al. The FRCM system is called textile-reinforced concrete or mortar (TRC or TRM) in Europe. single or multiple layers of 2D (or 3D) fabrics are impregnated by inorganic matrix such as cementitious mortar, lime mortar, or mortar comprising cement and polymers. The fabric-reinforced cementitious matrix (FRCM) system evolved from ferrocement where the metallic reinforcement is replaced by fabrics of dry fibers (ACI 549.4R-13): i.e.
Compressive strength increased by 10–41% while ductility also increased by 6–45% indicating applicability of the prefabricated type C-FRCM in the future. All test results showed strain-softening behavior. Plain concrete cylinders and prismatic specimens were laterally confined by C-FRCM and subjected to uniaxial compression. The required splice length was about 170 mm for the single fabrics and it was about 310 mm for the double fabrics. From the lap-splice tests in direct tension, an increased lap-splice length was required for the double fabrics over that for the single fabrics.
#LAP SPLICE TABLE FULL#
Full strength of the carbon fabric was developed in all tensile tests while the C-FRCM with two fabric layers (with axial fiber amount = 0.59% by vol.) showed pseudo-ductile behavior. Nominal strength of the C-FRCM with two fabric layers was 11.0 MPa while it was 7.4 MPa with one fabric layer in tension. Test variable for the tensile test was number of fabric layers (one or two layers).
Test plans were developed in due consideration of prefabricated C-FRCM for strengthening concrete columns: 14 tensile tests, 12 lap-splice tests, and 6 uniaxial compression tests of plain concrete specimens confined by C-FRCM were performed. Green high-strength mortar was used in this study which actively utilized recycled fine aggregate and fine waste glass powder to partially substitute cementitious binder. Results of an experimental study aimed to evaluate tensile performance, lap-splice length of carbon fabric-reinforced cementitious matrix system (C-FRCM), and performance of concretes confined by C-FRCM are presented.
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