Abstract
This study investigates the fracture properties of high performance cementitious composites (HPCC) with four different types of fibres and with volume fraction content 3%. The four fibres are steel hooked end (S), polypropylene crimped (PP), basalt chopped (B), and glass (G) fibres. The tests were carried out in accordance with the RILEM recommendations. In order to examine the fresh properties of HPCC the slump flow tests were performed. Twelve fibre reinforced HPCC beam specimens with notch were cast and tested using central point loading experiments. In addition, experimental tests of the compressive strength and splitting tensile strength were carried out. The test results made it possible to obtain representative fracture parameters, such as the equivalent strengths, residual strengths, and fracture energy of fibre reinforced HPCC. The S fibre specimens showed the best performance in terms of workability, compressive strength, tensile splitting strength, and fracture energy at large deflection. On the other hand, G fibre specimens exhibited the best performance in terms of flexural strength, equivalent flexural strength at higher deflection, and residual flexural strength at lower deflection. In terms of equivalent flexural strength at lower deflection and residual flexural strength at higher deflection, basalt fibre specimens performed the best. On the contrary, polypropylene fibre reinforced beam specimens revealed the highest deflection capacity.
Highlights
The high performance cementitious composite (HPCC) is a material composed of a cementitious matrix and other fine particles such as sand, silica fume, nanosilica, fly ash, as well as granulated blast furnace slag
Type on HPCC Workability this study, the slump testWorkability was carried out to assess the flowability of HPCC
The slump flow test was carried out to assess the flowability of HPCC
Summary
The high performance cementitious composite (HPCC) is a material composed of a cementitious matrix and other fine particles such as sand, silica fume, nanosilica, fly ash, as well as granulated blast furnace slag. Results showed that the addition of basalt, glass, and polypropylene fibres increased the flexural strength, impact resistance, and fracture energy in all self-compacting concretes. As a result of previous studies, it can be stated that steel, polypropylene, basalt, and glass fibres increase the flexural strength and tensile strength of concrete, but do not have a clearly positive effect on compressive strength. Studies published to date often provide conflicting and limited data on the effect of these fibres on fracture properties, toughness and post-cracking behaviour For these reasons, it is still necessary to conduct further research on the use of different types of fibres to assess fracture behaviour of HPCC, given that knowledge of fracture parameters is necessary to design of engineering structures. Test results demonstrate that calculations of the flexural strength parameters of HPCC reinforced with fibres over 40 mm long and high fibre content can be extended to a higher deflection points
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