DBPapers
DOI: 10.5593/SGEM2015/B12/S2.039

ENGINEERING CHARACTERISTICS OF NATURAL CONCRETE AGGREGATES USED IN KAHRAMANMARAS, TURKEY

A.A. Selcuk, T. Rizaoglu
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-32-2 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 2, 291-298 pp

ABSTRACT
The rapid development of the construction industry and the increase of high-quality concrete needs in Kahramanmaraş increased the importance of high quality aggregate. Aggregate sources in Kahramanmaraş and surroundings are different in lithology and origin. The aim of this study is to determine the engineering characteristics of the aggregates from riverbed (Aksu river and Erkenez creek) and crushed stone quarries (Crushed stone I and Crushed Stone II) which meet the majority of aggregate demand of Kahramanmaraş. As a result of petrographic studies, by means of lithology, Aksu riverbed is mainly composed of granite, peridotite, serpentinite, olivine gabbro, diabase, basalt, marble, quartz sandstone and limestone; Erkenez creek includes pyroxenite, peridotite, serpentinite, aplite, diabase, basalt, marble, sandstone and limestone, and crushed stone quarries limestone fragments. Alkali-Silica Reactivity (ASR) tests based on [1] standard with accelerated mortar-bar method was made, and the expansion ratios of bars for Aksu river, Erkenez creek, Crushed stone I and Crushed stone II yielded as 0,016 %, 0,019 %, 0,0187 %, and 0,038 % increase respectively. In [1] testing, after 14 days of soaking, more than 0.20 % expansion of mortar bars are considered as the aggregates are potentially ASR-reactive. The expansion ratios of the mortar bars prepared from the samples of all the four sources are lower than the limit of [1] standard, indicating their usability as concrete aggregates. The Physico-mechanical and chemical tests such as: grading, flatness index, form index, fine material ratio, fracture strength of coarse aggregate, Los Angeles coefficient, particle density and water absorption ratio, bulk density, freezing-thawing resistance of coarse aggregates, volume stability drying shrinkage coefficient, chloride content, acid-soluble sulfate content, compressive strength, setting time, humus content, fulvo acid content, methylene blue, light organic pollutant content on the samples from both crushed stone quarries and riverbed (Aksu river) indicate that all the sources correspond to quality standards.

Keywords: Kahramanmaraş, Concrete aggregates, Aksu riverbed, Erkenez creek, ASR