FUNDAMENTAL STUDY ON ANISOTROPY AND ITS ARISING MECHANISM IN COMPRESSIVE STRENGTH OF BRICKS

Abstract

The purpose of this study is to grasp anisotropy of bricks and to establish an appropriate compressive test method in evaluation of historic brick structures. From the previous experiment, it is clarified that extrusion-molded bricks have some anisotropy of compressive strength, and the compressive test method of JIS R 1250 is not appropriate, while JIS A 5210 is fine. In addition, arising mechanism of the anisotropy is discussed with a simple model of internal pore shape, and it is concluded that the anisotropy of compressive strength is caused by anisotropy of the pore shape which is generated in extrusion molding process.