Abstract
Alluvial fan is one of the environments having good potential for aggregate exploitation. Morphometric properties of alluvial fans’ catchment such as area and length of main channel have important role in the aggregate attributes. The aim of this research is to study the relation between morphometric characteristics of catchments and aggregate size and weight loss resulted from freeze–thaw and sodium sulfate soundness. To achieve the aim of this study, 12 alluvial fans on northwest of Direh catchment in Gilan-e Gharb county were selected. All selected fans having catchments with similar lithology were selected in this study in order to eliminate the effect of lithological differences in freezing–thawing test. Results show that as area and length of main channel in catchments increase, the rates of fracture, weight loss due to freezing–thawing, and sodium sulfate soundness decrease. The rate of weight loss is originated from morphometric characteristics of alluvial fans’ catchments. As area and length of main channel in catchments increase, the weight loss difference (from freezing–thawing and sodium sulfate soundness) between fine and coarse aggregates decreases. Indeed, the effect of particle size in the intensity of weight loss reduces with increase in area and length of main channel of catchments.
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