Development of a Simple Quantitative Method for Evaluating Concrete Separation Resistance

Abstract

Concrete is tested using slump testing, but slump testing is a method for evaluating concrete consistency, and it is thus difficult to directly evaluate concrete separation resistance by this method. Generally, it is common to perform slump plate tamping after slump testing, and observe concrete deformation to evaluate the concrete separation resistance, but this method is not quantitative. This research proposes a simple method for evaluating concrete separation resistance, based on compaction completion energy, by confirming the presence of circles on the top of a concrete sample after performing hammer tamping used in air volume measurement until the slump flow of a sample reaches 47cm after slump testing. This paper is an extended version of the author’s previous publication (Maruya et al. 2013).