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Description of near-tip fracture processes in strain hardening cementitious com...

Strain Hardening Cementitious Composites (SHCC) can be distinguished from other types of fiber reinforced cement-based matrix composites by the typical pseudo-strain hardening behavior they develop in tension. The design of Strain Hardening Cementitious Composites (SHCC) towards the development of multiple cracking in tension is based on the micro-mechanisms involved in the cracking process, including the fiber...

Characterization of cracking in strain hardening cementitious composites using ...

The characterization of the tensile behavior of strain hardening cementitious composites (SHCC) is of significant importance to the material design. In a previous work the tensile stress-crack opening response of different types of SHCC was characterized using notched specimens tested in direct tension, where a single crack was obtained and mechanically characterized by performing Single Crack Tension Test ...

Direct assessment of tensile stress-crack opening behavior of Strain Hardening ...

The process of designing Strain Hardening Cementitious Composites (SHCC) is driven by the need to achieve certain performance parameters in tension. These are typically the pseudo-strain hardening behavior and the ability to develop multiple cracks. The assessment of the tensile load-deformation of these materials is therefore of great importance and is frequently carried out by characterizing the material tens...

Effect of hybrid fiber reinforcement on the cracking process in fiber reinforced ...

The simultaneous use of different types of fibers as reinforcement in cementitious matrix composites is typically motivated by the underlying principle of a multi-scale nature of the cracking processes in fiber reinforced cementitious composites. It has been hypothesized that while undergoing tensile deformations in the composite, the fibers with different geometrical and mechanical properties restrain the propagati...

Hybrid fiber reinforcement and crack formation in cementitious composite materials

The use of different types of fibers simultaneously for reinforcing cementitious matrices is motivated by the concept of a multi-scale nature of the crack propagation process. Fibers with different geometrical and mechanical properties are used to bridge cracks of different sizes from the micro- to the macroscale. In this study, the performance of different fiber reinforced cementitious composites is assessed i...

Image-based detection and analysis of crack propagation in cementitious composites

The initiation and propagation of cracking in concrete and other cementitious materials is a governing mechanism for many physical and mechanical material properties. The observation of these cracking processes in concrete is typically taking place at discrete locations using destructive methods after the cracking process has occurred. The alternative nondestructive methods are often either not precise enough o...

Near-tip analysis of crack propagation in cementitious composites

The fracture process zone encloses relevant mechanisms which explain the quasi-brittle behavior of cementitious composites. It is an important concept in non-linear fracture mechanics and in the simulation of cracking processes. The use of fibers as reinforcement may alter the crack initiation and propagation processes. A better understanding of the micro-cracking mechanisms taking place at the level of the fra...

Crack formation and tensile stress-crack opening behavior of fiber reinforced c...

The formation and further development of cracking in strain hardening cementitiouscompos-ites under tensile loading strongly influences their mechanical behavior. The work presented in this paper de-scribes the crack formation in fiber reinforced cement composites (FRCC). The experimental results are ana-lyzed using a digital image analysis technique to gain detailed insight in the cracking process during the p...

Serum survey for antibodies to coronavirus, herpesvirus, calicivirus, and parvo...

Níveis de anticorpos contra o vírus da cinomose canina e o parvovírus canino em...

Antibody titres to canine distemper virus (CDV) and canine parvovirus (CPV) were measured in 132 dogs: 80 had been vaccinated at least once, 22 had not been vaccinated, and 30 had unknown vaccination history. Serum antibody titers were measured by means of serum neutralization (CDV) or hemagglutination inhibition (CPV). Serum CDV titers >20 and serum CPV titers >80 were considered protective. Protective antibod...