بررسی خواص مهندسی سنگدانه های جنوب بیرجند

:Abstract

Aggregates are one of the most important masonries. ۶۵ to ۸۵% of concrete and the kinds of mortars, ۹۰ to ۹۵% of asphalt, more than ۸۰% of earth dams materials and the whole of embankments are composed of aggregates. In order to do most accurate research on aggregates and find their place in structural developments, we did field studies and laboratory experiments in special areas that were indisposed and tectonised. So we focused on alluvial fans in Bagheran mountains with latitude of ۳۲؛,۴۵` to ۳۲؛,۵۵` & longitude of ۵۹؛ to ۵۹؛,۲۰` south of Birjand, the name of which are Monjegan(QMo), Omarshah(QOm), Aliabad(QAl) and are the most principal sources of aggregates and building materials used in local civil projects. Mother rocks, are ophiolitic series, which are continuations of Sistan big tectonic province ophiolite mélanges, affected by Alpine orogenesis. For a more comprehensive study of engineering properties of aggregates, the mother rocks of the ۳ aforementioned areas were considered and Rech area (containing Andesite-Dacite and related aggregates, searched because of its many uses in regional industries) was also studied. Generally, results show that the strength and engineering parameters of rocks and mélanges aggregates are suitable for civil applications as a kind of masonries except some rocks and aggregates that have a limited distribution .