Title: Introducing a New Quantitative Evaluation Method for Segregation of Normal Concrete
Author(s): In-Deok Han and Dongyeop Han
Appears on pages(s):
Keywords: Concrete segregation, Slump, Slump flow, Segregation evaluation, Quantitative method
The aim of this research is to provide a quantitative method for evaluating concrete segregation. Because of various conditions of concrete materials, mix proportions, and delivery, concrete can be segregated. The acquisition inspec‑ tion executed in construction field for supplied ready‑mixed concrete is an important quality control process for concrete. Among the inspections conducted at the project site, segregation of concrete mixture should be evaluated before placing the concrete mixture, currently a qualitative inspection on concrete segregation was conducted. For a normal concrete mixture with slumping behavior, shear slump or collapse slump often occur as an indication of seg‑ regation. The suggested evaluation index of segregation for normal concrete (EISN) was induced from the shape of the concrete slumping: relation between the maximum distance of flow and the minimum distance of flow. To evalu‑ ate the feasibility of EISN, two different concrete mixture conditions were tested. The recommended EISN parameter of segregation is 1.09 using the three grades of concrete quality. This new quantitative method of evaluating segrega‑ tion of the concrete mixture is expected to contribute to a more efficient quality control in concrete construction.