Abstract Polypropylene, steel, and carbon fibers are used to increase the ductility toughness of concrete materials. In recent years, studies on use natural have increasingly continued. Among fibers, hemp fiber has highest tensile strength value. The aim this study was discuss present results experimental cement-based shives mortars. Another is in construction field by using more economical fib...

Abstract Ten concrete mixtures, using long and medium length hooked-end short wave-shaped steel fibers, were designed to experimentally investigate the effect of hybrid reinforcement on workability, drying shrinkage, mechanical properties fiber reinforced concrete. The fibers reduced workability shrinkage. Hybrid including fiber, can produce a synergistic compressive strength. For adopted mater...

This paper employs PVA, PE, steel fibers, as well the hybrids of two three fibers to reinforce alkali-activated slag (AAS) material, aiming prepare strain-hardening and clinker-free composites. The flexural strength, compressive uniaxial tensile performance composites bond behavior between matrix were tested clarify reinforcement effects different on matrix. Strain-hardening AAS materials are o...

The features and mechanisms of the processes occurring during concrete centrifugation are considered. It was found that a significant difference in centrifugal centripetal forces acting on outer, middle inner layers cross-section leads to differences structure characteristics element layers. possibility regulating variatropia controlling properties seal by prescription factors is forms various ...

A new expression for estimating the ultimate shear strength of steel fibers reinforced high concrete (SFRHSC) beams strengthened with CFRP strips based on previous researches is proposed in this research. The covers different characteristics and principal parameters such as compressive strength, span to effective depth ratio, volume fraction fibers, amount distribution, stiffness, deep beam eff...

Concrete has been prestressed traditionally with high-strength steel. The vulnerability of such material to corrosion calls for alternate materials, if thin-sheet products are to be prestressed. A research project at Columbia University is investigating the feasibility of using aramid fiber mesh for such purpose. This paper explores the chemical and mechanical properties of aramid in the form o...

1 General Introduction Recently, transmitting greater amounts of electric energy has become a global issue that has arisen due to the fact that current transmission line designs (based upon steel cores) are thermally limited, which restricts the amount of power that can be delivered. Utilities are faced with the difficult task of increasing power delivery under severe constraints [1]. To solve ...

The post cracking behavior of steel fiber reinforced concrete (SFRC) subjected to direct tensile stresses is strongly related the distribution and orientation fibers in crack plane, which can be precisely determined using images obtained by computerized axial tomography (CAT). However, these require processing relate them residual resistances SFRC. objective this paper estimating strength SFRC ...

This research studied the influence of three types open (short-straight, long-straight, semicircular) and different shapes closed steel fibers (triangular, rectangular, circular) with fiber contents by volume (0, 0.5%, 1%, 1.5%, 2%) on working mechanical performance reactive powder concrete (RPC). The results indicated that (1) number enclosed area formed would remarkably impact RPC; (2) semici...

This paper presents an extrinsic Fabry-Perot interferometer-based optical fiber sensor (EFPI) for measuring three-dimensional (3D) displacements, including interfacial sliding and debonding during delamination. The idea employs three spatially arranged EFPIs as the sensing elements. In our sensor, the three EFPIs are formed by three endfaces of three optical fibers and their corresponding incli...