The Effect of Chemical Composition of Ultramafic and Mafic Aggregates on Their Physicomechanical Properties as well as on the Produced Concrete Strength

Minerals

Nikolaos Koukouzas¹  Basilios Tsikouras²  Konstantin Hatzipanagiotou³  Aikaterini Rogkala³  Paraskevi Lampropoulou³  PanagiotaP. Giannakopoulou³  Petros Petrounias³ 

[1] Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas (CERTH), Maroussi, 15125 Athens, Greece;Physical and Geological Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, Bandar Seri Begawan BE1410, Brunei;Section of Earth Materials, Department of Geology, University of Patras, 265 04 Patras, Greece;

关键词: petrographic characteristics;    physicomechanical properties;    chemical composition of aggregates;    geochemical index;    concrete;   

DOI  :  10.3390/min10050406

来源: DOAJ

【 摘 要 】

This study examines how the chemical composition of ultramafic and mafic rocks effects their physicomechanical properties and therefore how influences the concrete strength of the produced concrete specimens. For this scope, ultramafic (Group I) and mafic rocks (Group II) derived from the Veria–Naousa and Edessa ophiolite complexes (Greece) were selected in order to identify their chemical composition and their engineering properties according to international standards. Additionally, representative rocks were used as concrete aggregates in order to produce concrete specimens, whereas their mechanical strength was calculated. A geochemical index (Ga) was proposed and correlated with the engineering properties of the examined rocks as well as with the widely used alteration degree LOI (loss on ignition). Correlation diagrams between engineering properties and the proposed geochemical index (Ga) have showed that these properties were strongly influenced by the alteration processes expressed via Ga index. More particularly, mainly serpentine in ultramafic and chlorite in mafic rocks, minerals indicators for the alteration of ultramafic and mafic rocks, respectively, seem to determine their engineering properties. Concerning the mechanical strength of the produced concrete specimens, the results have showed that the increasing values of Ga index negatively effect concrete strength.

【 授权许可】

Unknown