Characterization of Fiber-reinforced Cement Composites by Their Tensile Stress- Strain Behavior and Quantification of Crack Formation
نویسنده
چکیده
The behavior of fiber reinforced cement composites (FRCC) can be described and quantified by a variety of parameters, such as strength and strain capacity, toughness index, and fracture energy, obtained from tests in tension or bending in a large number different configurations including varying specimen geometries and test setups. Depending on the details of the individual testing procedures, a particular composite may be characterized and classified inconsistently. To enable the evaluation of FRCC performance, a common basis for comparison is required, which will reflect the relevant material characteristics. Standardized test methods have been established for conventional FRCC with tension softening behavior. These test methods provide parameters, which are difficult to implement in structural design and cannot be universally applied to High Performance FRCC with strain hardening and multiple cracking behavior in tension. In this paper, a tensile test and analysis procedure is conceptually outlined to characterize HPFRCC by their tensile stress-strain relationship and quantification of cracking. The deformation characteristics of the composite, i.e. the crack formation including number, position, width, and spacing, are monitored and quantified by a digital image analysis process. Based on these material properties, the level of mechanical performance of HPFRCC can be evaluated and compared.
منابع مشابه
Experimental Strengthening of the Two-way Reinforced Concrete Slabs with High Performance Fiber Reinforced Cement Composites Prefabricated Sheets
Reinforced concrete structures need to be strengthened and retrofitted for various reasons, including errors during design and/or construction, so in most cases strengthening of structural elements is much more economical than rebuilding the structure. Using HPFRCC with tensile stiffening behavior has been developed to strengthen the concrete structures over the recent few years. In this paper,...
متن کاملCreep Behavior of Basalt and Glass Fiber Reinforced Epoxy Composites
The creep behavior of basalt fiber reinforced epoxy (BFRE) and glass fiber reinforced epoxy (GFRE) composites was studied through tensile testing at high temperature. To study the effect of reinforcing epoxy, the micro glass powder (MGP) was added at various volume percentage into the epoxy resin in BFRE composites. The initial strain for all the specimens were evaluated and compared with each ...
متن کاملMeso-scale Modeling of Tension Analysis of Pure and Intra-ply Hybrid Woven Composites Using Finite Element Method
One of the key issues associated with using of composites in various applications is their tensile behavior. The tensile behavior of a composite material is strongly influenced by the properties of its constituents and their distribution. This paper focuses on gaining some insights into the tensile process of pure and hybrid woven composite reinforced with brittle and ductile yarns. For this pu...
متن کاملDurable Overlay Systems with Engineered Cementitious Composites (ECC)
This paper reviews recent research on the application of an engineered cementitious composite (ECC) as overlay in the repair of deteriorated concrete structures. ECC is an ultra-ductile fiber reinforced cement based composite, that has metal-like features when loaded in tension. The uniaxial tensile stress-strain curve shows a ‘yield’ point, followed by strain-hardening up to several percent st...
متن کاملMECHANICAL CHARACTERIZATION AND ANALYSIS OF RANDOMLY DISTRIBUTED SHORT BANANA FIBER REINFORCED EPOXY COMPOSITES
Short banana fiber reinforced composites have been prepared in laboratory to determine mechanical properties. It has been observed that as soon as the percentage of the banana fiber increases slightly there is a tremendous increase in ultimate tensile strength, % of strain and young modulus of elasticity. Reinforcement of banana fibers in epoxy resin increases stiffness and decreases damping pr...
متن کامل