Evaluation Method of Segregation of Road Concrete

Abstract

To deal with the problem there was no strict evaluation method and standard, an experiment was designed to evaluate the segregation degree of road concrete. Furthermore, the status and index of segregation was determined too. The testing analyzed the distribute character of coarse aggregate in road concrete. Based on the method of digital image processing and the assumption that particles in fresh concrete conform to uniform distribution, a model that size of coarse aggregate against vertical section (the direction against vertical section of specimen) in concrete conforms to continuous distribution was established. Segregation degree—a parameter to characterize the degree of segregation of particles in concrete was proposed. Meanwhile，a reference standard to evaluation segregation degree was given.

Study on the Effect of Vibrating Process on the Compactness of Slipform Concrete

“…Table 7 shows the Comparative analysis of SD and SC. Yancong proposed in the experiment that SD greater than 0.10 is severe segregation, and the quality of concrete begins to be significantly affected [26]. From the table, it can be seen that when the SD value is less than 0.1, according to the evaluation method for coarse aggregate segregation in this article, the segregation rate SC value of concrete is basically below 0.15.…”

“…At present, there is no unified standard for the evaluation method of concrete segregation, and the most commonly used method is the segregation degree SD [26]. This method is mainly based on the digital image processing method and the assumption that the coarse aggregate is evenly distributed in the volume space, and characterizes the segregation degree of the aggregate inside the concrete by establishing a radial continuous distribution model of the coarse aggregate.…”