Effect of different specimen size on raw soil materials

Abstract

Abstract: The compressive strength of parts is an important mechanical indicator of raw soil-based building materials. For the purpose of studying the size effect of cube specimens of raw soil materials, this research explores the influence of different sizes of specimens on compressive strength of the materials. Compressive strength tests of three kinds of cube raw soil specimens with the same sample preparation method, maintenance method and loading method were carried out to investigate failure pattern and compressive strength of the specimens. The regularity and mechanism of effect of different specimen sizes on the strength are investigated, and the strength relation coefficients of the three sizes of specimens are calculated hence by statistical screening method. Results from our researches indicate that the failure process of specimens with small size is obvious. The compressive strength of the material decreases with increase of specimen size, exhibiting a linear relationship. The strength conversion coefficient between 100 mm specimen and 150 mm specimen is 0.67, and that between 100 mm specimen and 200 mm specimen is 0.42. The compressive strength of raw soil-based materials is significantly affected by size effect.

Key words: raw soil materials, specimen size, compressive strength, size effect, relation coefficient

CLC Number:

TU361

ZHANG Kun, WANG Yi-hong, PU Yong-hong, WAN Tian-ya, YANG Zhan-she. Effect of different specimen size on raw soil materials[J]. Journal of Lanzhou University of Technology, 2021, 47(2): 107-112.

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