Rheological properties of High Performance Self-Compacting Concrete: Effects of composition and time

Kostrzanowska–Siedlarz, Aleksandra; Gołaszewski, Jacek

doi:10.1016/j.conbuildmat.2016.04.027

Cited by 37 publications

(20 citation statements)

References 13 publications

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“…It has already been proven that the cement paste content and water/binder ratio are significant parameters of the mix design due to the appropriate rheological properties [8]. Ostrowski et all.…”

Section: Literature Surveymentioning

confidence: 99%

Comparative analysis of the coarse aggregate shapes used to manufacturing high performance self-compacting concrete

2018

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The influence of the shape of coarse aggregate on the properties of fresh concrete mixes, and the strength of high-performance self-compacting concrete (hPsCC) is important issue. In this study, irregular and regular grains were separated from the basalt, porphyry and granite coarse aggregate. The shape of these grains was determining using digital image analysis and was in accordance with the european standard [19]. The aspect ratio (ar) and roundness (r) were ascertained in order to highlight the differences in the coarse aggregate shape used the design hPsCC. The study indicates that using the same crushing system, varied parameters of the shape of coarse aggregates were obtained. It was determined that the best fitting distribution for aspect ratio and roundness at a 95% confidence level is the generalised extreme value distribution.

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Section: Literature Surveymentioning

confidence: 99%

Comparative analysis of the coarse aggregate shapes used to manufacturing high performance self-compacting concrete

2018

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“…A major problem is the different behavior of the different types of concrete. By using aggregates or by varying the mixing process over time, it is possible to observe flow characteristics that sometimes deviate significantly from each other [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Pumping of a Model-Concrete through Pipes

2020

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Many practical aspects of processing fresh concrete depend on its rheology, such as the pumping of the material. It is known that a lubricating layer is formed in the process, which significantly reduces the pumping pressure. However, these phenomena can hardly be considered in the usual rheological measurements. A main problem is the optical inaccessibility of the material, which prevents estimations about, e.g., the thickness of the plug flow or particle migration. In this paper, the pneumatic pumping of a transparent model concrete is performed by means of a test plant. The flow profile over the entire pipe cross-section is resolved in time and space via Particle Image Velocimetry (PIV) measurements. This allows the comparison with the analytical flow profile from rheological measurements of the material using the Buckingham–Reiner equation. A reduction of the pressure loss to around 60% induced through segregation of the material is found. These measurements reflect the rheology of the material under realistic pumping conditions including particle migration. This makes it possible for the first time to observe a transparent material with concrete-like rheology under pulsating pumping conditions and to compare the true and calculated time-resolved pressure loss.

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“…According to previous research (Kostrzanowska-Siedlarz & Gołaszewski, 2016;Sebaibi, Benzerzour, & Abriak, 2014;Herrmann & Lees, 2016;Herrmann, Goidyk, & Braunbrück, 2019b), the main factors which are important to take into account during the manufacturing process are:…”

Section: Introductionmentioning

confidence: 99%

Initial results of local strength analysis of a fiber concrete plate by 4-point bending tests

Goidyk

Herrmann

2019

Modern Building Materials, Structures and Techniques (MBMST)

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The analysis of the post-cracking behavior of a large plate cast of fiber concrete shows a large variability due to the fiber alignment and dispersion. Therefore, one can expect, that the bending strength and other material parameters depend on the position in the plate. This means that the position the samples for testing are taken from may play a significant role in assessing the mechanical properties and strength of composite materials. Often, the investigation of fiber concrete properties have been performed by testing small size beams. The results can be influenced by the boundary restrictions, such as wall-effect, which influences the fiber distribution. In this study the four-point bending strength of beams cut out of a large plate was investigated, the results represent the local strength of the plate in this particular place. The fiber orientation and distribution have been evaluated by X-ray Computed Tomography and Image Analysis Method. The results of the experiments have shown that the position of the beam inside of a large-size plate has a strong influence on the mechanical properties and post-cracking behavior. The analysis of the obtained outcomes proposes the following conclusions: the beams that were located near the edges of the formwork have shown a strong, strain-hardening behavior, and the beams that were located on the way of the casting bucket (a zone of the high turbulence/perturbation/disturbance) have shown a weak, strain-softening behavior.

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Rheological properties of High Performance Self-Compacting Concrete: Effects of composition and time

Cited by 37 publications

References 13 publications

Comparative analysis of the coarse aggregate shapes used to manufacturing high performance self-compacting concrete

Comparative analysis of the coarse aggregate shapes used to manufacturing high performance self-compacting concrete

Experimental Investigation of the Pumping of a Model-Concrete through Pipes

Initial results of local strength analysis of a fiber concrete plate by 4-point bending tests

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