Study on Concrete Workability Based on Comparison between the Minimum Paste Demand and the Closest Packing Density. (27th April 2020)

• Record Type: Journal Article
• Authors: Zhang, Gaolong; Yan, Zhaoyu; He, Fuqiang; Wang, Ruipan; Chen, Changping
• Other Names: Bia Pietro Academic Editor.
• Is Part Of: Mathematical problems in engineering. Volume 2020(2020)
• Publication Date: 2020-04-27
• Subjects: Engineering mathematics -- Periodicals; 510.2462
• DOI: 10.1155/2020/8934684
• Languages: English
• ISSNs: 1024-123X

Abstract

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.