Abstract
Viscoelastic properties of highly filled suspensions (HFS) of ceramic powders-bentonite, kaolin, alumina and titania-mixed with various binders were tested by means of the mono-axial compression method. The rheological properties of HFS before and at rupture were: Strains at rupture, eR, were independent of concentration and were in the range, 0.1 to 0.2, for every combination of powders and binders. Rupture strengths, σR, were highly dependent on solid concentration and varied with powders and binder combinations. A binder, HPMC, gave adhesiveness and softness to the HFS, and did not show complete rupture. The CMC gave the most brittle nature to the HFS. In addition, thixotropic hardening was observed for long time loading with every sample. Burgers' model in which the time dependency term was introduced into the Maxwell part was presented to simulate the rheological behavior of HFS. Finally, the effect of binders was quantitatively estimated.
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