The prediction of the expandability of clays using a ternary diagram

Yıl 2019, Cilt: 158 Sayı: 158, 299 - 310, 25.04.2019

Ahmet Ozguven

https://doi.org/10.19111/bulletinofmre.417966

Öz

The aim of this
study is to put forward a prediction scheme for the expandability of clays by
use of inexpensive and rapid chemical analysis. Seventy clay ores from fourteen
locations throughout central and west Turkey were characterized
mineralogically, chemically, and for expansion testing. Using the ternary
plotting scheme of SiO₂-Al₂O₃-fl uxing samples exceeding 50% expansion plotted
within and slightly beyond the region proposed by Riley (1951). This study
newly extends the region in ternary space for samples suitable for expansion
and use in light weight aggregate. Non-expanding samples are associated with
mineral assemblages dominated by quartz. In this study, it was determined that the
samples without the expandability property were lacking the required chemical
aspect of SiO₂- Al₂O₃-fl uxing ratios, mineralogical clay structures,
proportions and gas agents. In addition, the effect of having a too low or high
position on the triangle diagram was found to have a negative impact on the
expandability. When mineralogical analyses, mineral associations, chemical
compositions and expandability results were evaluated together, it was observed
that Mica GM-Chloride GM; Montmorillonite-Zeolite-Amorphous matter and Clay
GM-Amorh Silica-Cristobalite are the samples showing expandability properties
for the extent of this study. Also, it was noted that almost all samples with
graphite content did expand. The extension of the suitability fi eld on the
ternary diagram for prediction of expansion properties, combined with low cost
and rapid chemical analysis demonstrate benefi ts for the clay production
industry in Turkey, particularly for saving energy and fi nancial resources
needed during exploration and early stages of production clay ores.

Anahtar Kelimeler

ternary diagram, prediction of expandibility, Expanded clay

Kaynakça

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