The Effect of Type and Amount of Fly Ash on the Mechanical Properties of Cement

15737

The aim of this research is to study the effects of different classes of fly ash and their substitution amounts on compressive strength, bending strength and unit weight of cement mortars. F class fly ash which is procured from Çayırhan thermal plant and C class fly ash which is procured from Orhaneli thermal plant are used in this study. In preparation of the specimens cement in the mixture is substituted with fly ashes from Çayırhan and Orhaneli thermal plants in 0 %, 5 %, 10 %, 15 % and 20 % ratios, then for each mixture 3 prism specimens having 40x40x160 mm dimensions are prepared. The amount of the water used for each group of mixture is determined by realizing flow table test according to the flow diameter specified in ASTM C230, C109 and C1437 standards. Unit weight, bending strength and compressive strength experiments are performed on the specimens. The results are evaluated with statistical analysis. As a result, strength values of cement mortars with C class fly ash substitution are found to be smaller than those of cement mortars with F class fly ash substitution. With the increase of C class fly ash substitution ratio the compressive strength figures decline. However, in spite of this decrease it is found that the compressive strengths of cement mortars with fly ash substitution are still between standard values.

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Cement , fly ash , compressive strength , bending strength , substitution

Journal Of Polytechnic

161

Journal Of Polytechnic