Open AccessStudy on Concrete Workability Based on Comparison between the Minimum Paste Demand and the Closest Packing Density
Author(s) -
Gaolong Zhang,
Zhaoyu Yan,
Fuqiang He,
Ruipan Wang,
Changping Chen
Publication year - 2020
Publication title -
mathematical problems in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.262
H-Index - 62
eISSN - 1026-7077
pISSN - 1024-123X
DOI - 10.1155/2020/8934684
Subject(s) - mortar , materials science , sphere packing , composite material
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.