X線CTによるスラグ路盤材特性評価

抄録

Main application of steelmaking slag is a base course material. In order to utilize slag as a base course material, it is necessary to have various characteristics in the criteria, and the modified California Bearing Ratio (CBR) value which evaluates the performance as a base course material is an important index in comparison with other competitors. Although it is expected that various factors such as properties and granularity affect CBR characteristics and compaction properties, the particle properties and granularity of steelmaking slag is different on each refining process which produce steelmaking slag. In addition, until now, X-ray CT measurement for slag base course material and effect of particle property have not been examined. Therefore, in this study, measurement of the internal phenomena of the steelmaking slag base course material by micro-focused X-ray CT and various measurement were carried out. It was revealed that the particle strength of porous particles is lower than that of dense real particles regardless of particle size and the subbase bearing capacity did not differ as much as the particle strength difference. In addition, from the mechanism by which the stress propagates and elastic finite element analysis by using X-ray CT, it was considered that the distribution of the stress was changed by the dispersion of the particle strength of each grain, and it affected the property of base course material which was the integral value of the effective stress.