Modified rule of constant water content for constant consistency of fresh fly ash concrete mixes

Hansen, Torben C.; Hedegaard, S. E.

doi:10.1007/bf02472593

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Adherence of very fine PFA particles on cement particles promotes the dispersion effect. The dispersion hypothesis is supported by other workers[ 23,24].…”

Section: Water Requirementsupporting

confidence: 76%

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Balendran

Pang

1995

Structural Survey

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Discusses the properties of pulverized fuel ash (PFA) concrete both in its fresh and hardened states, with emphasis on aspects which are relevant to warmer localities such as Hong Kong. Sufficient research evidence, including surveys of existing structures, have been reviewed to conclude that PFA, when used correctly and properly, has the potential to enhance the performance of good concrete. Analyses the contribution of PFA in the enhanced performance of concrete. Cautions that much of the enhanced performance depends on the microstructure of the concrete, which in turn depends significantly on a proper mix design, with or without PFA. Proposes that water reduction is a desirable property of PFA. However, considers it possible to accommodate PFA characteristics in the mix design and by the use of plasticizer to produce good quality PFA concrete. Briefly discusses the characteristics of Hong Kong locally produced PFA.

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“…Adherence of very fine PFA particles on cement particles promotes the dispersion effect. The dispersion hypothesis is supported by other workers[ 23,24].…”

Section: Water Requirementsupporting

confidence: 76%

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Balendran

Pang

1995

Structural Survey

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“…Significant values of interaction coefficients b 12 and b 23 in the models indicate a significant increase in the waterreducing effect of the additive with increasing cement and blast furnace slag consumptions, i.e., the concrete mixture binder component (Figures 1, 2). Mostly a more noticeable increase in water demand is observed when the cement consumption is more than 400 kg/m 3 , i.e., outside the constant water demand rule scope [21,22]. Accordingly, water demand practically does not change at cement consumption from 200 to 400 kg/m 3 (see Figure 1).…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Optimization of Self-Compacting Concrete Containing Blast-Furnace Slag Compositions

Zhitkovsky

Дворкін

Ribakov

2022

Advances in Materials Science and Engineering

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The paper deals with composition design of self-compacting concrete containing blast furnace granulated slag and polycarboxylate type superplasticizer in a wide range of concrete strength classes. Optimal superplasticizer content, cement, and blast furnace slag consumptions are obtained from the viewpoint of minimum water demand and water-cement ratio, maximum self-compacting concrete mixture workability retention, and concrete strength. A significant effect of joint influence of superplasticizer and blast furnace slag is demonstrated. The possibility of minimizing the cement consumption at optimal superplasticizer content and slag consumption of 100–120 kg/m3 is shown. Dependences for calculating SCC strength at 1, 7, and 28 days vs. the water-cement ratio are obtained. It is found that the nature of correlation dependences for SCC splitting and compression strengths when using the blast furnace slag and the superplasticizer is linear. Optimization of SCC compositions using mathematical programming enables to obtain compositions with a lowest possible cost while providing a set of specified parameters.

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“…The influence of these factors on the models is also characterized by the presence of a quadratic effect, which indicates the existence of an optimal values region. The presence of an optimum zone for factors X 1 and X 2 , which characterize an increase in the proportion of crushed stone and slag in concrete, is caused by an increase in voids with a high number of coarse fractions and a simultaneous decrease in the concrete mixture water demand [ 32 ]. The optimal zone of the C/W factor (about 2–2.3) ( Figure 4 b) is most likely caused by a significant increase in the mixture viscosity and the occurrence of some concrete under consolidation with a simultaneous increase in the cement paste density [ 19 , 24 ].…”

Section: Experimental Data and Its Processingmentioning

confidence: 99%

Analysis of Slag-Containing Steamed Concrete’s Composition Efficiency

Dvorkin,

Zhitkovsky,

Makarenko

et al. 2024

Materials

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Thermal power plant slag is a waste that is presently obtained from many power stations all over the world. A possible method for its utilization is using it to produce concrete. This paper analyses the effect of thermal power plant slag on the technological properties of concrete mixtures and the mechanical properties of concrete subjected to heat–moisture processing. Quantitative estimates of the investigated factors’ influence on the concrete mixture’s water demand and the strength of steamed concrete were obtained. The influences of TPP slag content and its water demand on concrete composition features as well as concrete strength are shown. The novelty of the work lies in the use of an experimental–statistical model to optimize the composition of steamed concrete using slag from the viewpoint of maximum strength per kilogram of cement. It has been demonstrated that the optimal part of slag in aggregate, which provides maximum strength at 4 h and 28 days after steaming, is 0.5–0.55 and 0.45–0.55, respectively. A method for the design of concrete composition using slag from thermal power plants is proposed.

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Modified rule of constant water content for constant consistency of fresh fly ash concrete mixes

Cited by 7 publications

References 2 publications

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Optimization of Self-Compacting Concrete Containing Blast-Furnace Slag Compositions

Analysis of Slag-Containing Steamed Concrete’s Composition Efficiency

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