The aim of this study was to examine usability of diatomite, a natural amorphous and porous raw material as an additional blend in an effort to improve the performances of natural pozzolan-blended cements. To this aim, varying proportions of pozzolan, diatomite and pozzolan- diatomite blended cements were prepared and chemical, physical, mechanical, mineralogical and micro-structure tests were applied to the resulting cements. The test results indicated that diatomite biend may be effective in improving pozzolanic properties, reducing setting time, reducing alkali content and increasing early-ultimate strengths of pozzolan-blended cements.
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