DIAMETRAL COMPRESSION STRENGTH OF UNWANA CLAY

AUTHOR: NDUKWE, AGHA INYA

DEPARTMENT: MATERIAL AND METALLURGICAL ENGINEERING

AFFILIATION: FEDERAL UNIVERSITY OF TECHNOLOGY OWERRI

The diametral compression strength of clay was investigated. The
clay sample was analyzed to ascertain its chemical composition
and mineralogical constituent. The diametral clay discs were
produced using a uniaxial cold pressing hydraulic press and
sintered at a predetermined temperature and time (1200℃ and 15
minutes). Two diameters (D) of discs of 23mm and 29mm were
used with varying thicknesses (3mm-10mm). The effect of disc
thickness with intent to qualitatively define the plane stress and
the plane strain fracture conditions of the clay was undertaken.
The plane stress condition was obtained by discs with thickness
≤ 1 ⁄ 4 􀜦 for 23mm and 29mm whilst the plane strain condition
was obtained by testing discs of thickness > 1 ⁄ 4 􀜦. The
diametral compression strength of discs of thicknesses 3 − 10􀝉􀝉
gave a range of 14.6 − 5.5􀜯􀜲􀜽 for samples of 23􀝉􀝉 diameter whilst
a range of 5.8 − 2.2􀜯􀜲􀜽 was obtained for samples of 29mm
diameter. Greater numbers of 29mm diameter samples failed in
the normal tensile fracture mode whilst more samples of 23mm
diameter failed in the triple-cleft fracture mode. 23mm diameter
discs gave higher values of Weibull moduli in comparison with the
values obtained for discs of 29mm diameter indicating the flaws
sampled in the 23mm diameter were of the same severity. Pores
were observed to be singularly effective as initiation sites for
failure as shown by the negative slope of the effect of porosity on
the strength of clay.

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