Report: Efficiency of concrete mixers towards qualification of mixers

Charonnat, Y; Beitzel, Harald

doi:10.1007/bf02539273

Cited by 25 publications

(12 citation statements)

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“…Various parameters affect the efficiency of mixers namely geometric volume of mixing container, feeding procedure, the arrangement of stirring blades, mixing velocity, power consumption, etc. [29,30]. In the current study, the difference between water retaining capacities of mortars and concrete were related to the increase in packing density of particles in concrete due to higher compaction energy applied to the blend by the concrete mixer.…”

Section: Flowability Measurementsmentioning

confidence: 57%

Effect of water film thickness on the flow in conventional mortars and concrete

2019

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Mortar and concrete can be divided into two phases of solids and water, where water fills the voids between the grains and also coats the surface of the particles. The current study investigates the influence of the thickness of coating water on flow spread of mortars and concrete. The article aims at correlating consistency of concrete to consistency of mortar using the concept of excess water layer theory. It was found that the flow behavior of granular mixtures can be directly related to the average water film thickness that envelops the particles. The concept was tested on mortars and concrete mixtures with different cement types, aggregate grading, aggregate shape, fineness and proportioning; proving water film thickness to be the most critical parameter affecting the flow. The results of the study indicate the possibility of predicting the flowability of mixtures by knowing the thickness of the water film that envelops the grains. In addition, the relation between flowability of mixtures measured in different sizes of slump cone is explored to enable translating flow of mortars measured in mini-slump cone to flow of concrete obtained from Abrams' cone.

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Section: Flowability Measurementsmentioning

confidence: 57%

Effect of water film thickness on the flow in conventional mortars and concrete

2019

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“…The loading period is extended from the time when the first constituent is introduced in the mixer to when all the constituents are in the mixer. RILEM (Réunion Internationale des Laboratoires d’Essais et de Recherches surles Matériaux et les constructions) [ 8 ] divides the loading period into two parts: dry mixing and wet mixing ( Fig. 5 ).…”

Section: Mixing Methodsmentioning

confidence: 99%

Concrete mixing methods and concrete mixers: State of the art

Ferraris

2001

J. Res. Natl. Inst. Stand. Technol.

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As for all materials, the performance of concrete is determined by its microstructure. Its microstructure is determined by its composition, its curing conditions, and also by the mixing method and mixer conditions used to process the concrete. This paper gives an overview of the various types of mixing methods and concrete mixers commercially available used by the concrete industry. There are two main types of mixers used: batch mixers and continuous mixers. Batch mixers are the most common. To determine the mixing method best suited for a specific application, factors to be considered include: location of the construction site (distance from the batching plant), the amount of concrete needed, the construction schedule (volume of concrete needed per hour), and the cost. Ultimately, the quality of the concrete produced determines its performance after placement. An important measure of the quality is the homogeneity of the material after mixing. This paper will review mixing methods in regards to the quality of the concrete produced. Some procedures used to determine the effectiveness of the mixing will be examined.

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“…Schiessl et al [129,130] divided the concrete mixing process into three stages: the dispersion period; the optimal mixing period, and the over mixing period. There is an optimal mixing time for concrete with a certain mixing proportion [131].…”

Section: Mixing Timementioning

confidence: 99%

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

et al. 2020

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In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air–liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.

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Report: Efficiency of concrete mixers towards qualification of mixers

Cited by 25 publications

References 0 publications

Effect of water film thickness on the flow in conventional mortars and concrete

Effect of water film thickness on the flow in conventional mortars and concrete

Concrete mixing methods and concrete mixers: State of the art

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

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