Multi-scale particles optimization for some rheological properties of Eco-SCC: Modelling and experimental study

Zhang, Junyi; Xu, Peng; Gao, Xiaojian

doi:10.1016/j.conbuildmat.2021.125151

Cited by 20 publications

(6 citation statements)

References 67 publications

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“…The initial test consisted of only a single kind of powder [13], of which n and [η] were 4.2 and 2.5, respectively. Then Zhang [17][18][19][20] researched the equivalence model for binary or ternary powder based on the test results, where the powders of the same type had the same parameters. According to his research, n and [η] of FA were 6.5, while those of LP were 7.0.…”

Section: Limitation Of Existing Researchmentioning

confidence: 99%

“…According to the results, S A∩B /S B of each serial is less than one, showing excessive prediction. Based on the areas calculated, the prediction accuracies were obtained by Equations ( 16) and (17). Table 16 and Figure 10 show the prediction accuracies of the original and modified methods.…”

Section: No Graphic Presentation ε Sa∩b/sb Sa/ Sb ε′mentioning

confidence: 99%

“…Further studies of the improvement of this mix design method were proposed. Concerning the aggregates, Zhang [15][16][17][18][19] studied the influences caused by the size, content, and shape of sand [16] and gravel [15]. Except for aggregates, the powder material had large proportions of concrete.…”

Section: Introductionmentioning

confidence: 99%

“…SCC consists of a higher percentage of cementitious materials than traditional concrete [3], which leads to higher costs and environmental impact. The minimization of the carbon footprint and the utilization of natural resources are focus issues worldwide, and substitutes for cementitious materials are an especially important concern in the application of SCC [17]. To increase the applicability of substitutable powder, Zhang studied the impact of fly ash (FA) and limestone powder (LP) [18][19][20] from the viewpoint of empirical coefficients and equivalence models.…”

Section: Introductionmentioning

confidence: 99%

“…The original parameters reported by Wu were based on research by Toutou [24] and Banfill [25], two cement constants. Then, Zhang [17,19] studied the equivalent and empirical coefficients of FA and LP. In the above studies, each type of powder shared the same parameters, neglecting the diversities between powders within the same type.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Mix Design Method for Multiplexed Powder Self-Compacting Concrete Based on the Multiscale Rheological Threshold Theory

Jiao

et al. 2022

Buildings

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The multiscale rheological threshold theory can guide the mix design of self-compacting concrete (SCC) from a trans-scale view. Through the paste thresholds calculated by the mini-slump flow test results, the workability of SCC can be predicted. However, this method shows insufficient prediction accuracy when handling multiplexed powder. In the existing threshold calculation formula, the characteristics of powder materials were described through empirical values, without considering the specific properties of various powders. This paper focuses on the application of the multiscale rheological threshold theory to multiplexed powder SCCs. Through the research on the characteristics of powder materials, especially D50 and Span, the effect of the powder properties on paste thresholds was carried out. The prediction accuracies were confirmed by four sets of self-compacting mixtures at paste and concrete scales and were verified with another set of tests. There are a total of 45 paste and 45 SCC test results with multiplexed powders, including cement, fly ash, and limestone powder. The predicting accuracies are expressed as the relative accuracy ε and the accuracy index ε′, calculated by the comparison of self-compacting zones at paste and SCC scales. The calculation results showed that ε and ε′ of the modified method increased. This modified method can be efficient for the mix design of SCC containing multiplexed powders.

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