Study on Concrete Workability Based on Comparison between the Minimum Paste Demand and the Closest Packing Density

Gaolong Zhang, Zhaoyu Yan, Fuqiang He, Ruipan Wang and Changping Chen

Mathematical Problems in Engineering, 2020, vol. 2020, 1-14

Abstract:

The mixture design method (MDM) has been used to design the concrete workability with the three-graded stone. The results indicated that the proportion of the stone corresponding to the minimum paste demand ( P min ) can meet that corresponding to the approximate closest packing density ( ACPD max ). When the workability reaches its maximum value, the paste thickness ( T paste ) and mortar thickness ( T mortar ) do not reach their respective extreme values. Therefore, the combined effect of the T paste and T mortar needs to be considered when evaluating concrete workability. Compared with concrete designed by the maximum packing density, the concrete designed by the P min + ACPD max has a lower cost; however, stone surface area ( S stone ) and the average particle size of the stone ( D A-stone ) are increased by 8.6% and reduced by 5.7%, respectively. Therefore, the contradictory weakening effect of an increase in the S stone and a decrease in the D A-stone on the interface transition zone in both cases requires further investigation.

Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:8934684

DOI: 10.1155/2020/8934684

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