A Research on the Usage of Corn Cob in Producing Lightweight Concrete

In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete has been investigated. First, some important physical properties of corn cob have been determined in the laboratory. These properties are as follows: weight to volume ratio (unit weight), water absorption rate and granulometric analysis. Later on, 4 concrete mixtures have been prepared according to the workability of concrete and standards specified in Turkey. After that, unit weight, heat transmissibility coefficient and 28-day pressure strength of these 4 concrete samples have been determined using machines measuring these properties. The 28-day pressure endurance value has been found between 1.4 - 56.25 kgf/cm2, heat transmissibility coefficient has been found between 0.19 - 0.35 Kcal/m∙h∙˚C and unit weight of samples have been found between 800 - 1520 kg/m3. Lastly, these properties of concrete samples have been compared with other lightweight materials being used in the construction of buildings.

ANALISI CHIMICHE DELLE 《PORFIRITI》 TRIASSICHE DEL MONTE GUGLIELMO(Brescia)

Nella presente nota vengono discussi dal punto di vista petrografico e chimico i caratteridegli affioramenti delle 《porfiriti》 triassiche dell’area del M. Guglielmo, compresa tra la Val Trompiae il lago d’Iseo. Le analisi chimiche eseguite indicano un carattere seriale ad affinità, calcalcalina. IIdato petrochimico, riferito all’ambiente geodinamico che ha controllato la sua evoluzione non implicanecessariamente I’esistenza di un regime compressivo, come chiaramente emerge dal confronto con altreserie calcalcaline effuse in un regime di distensione. Chemical analysis of the Triassic porphyrites of Monte Gugliehno (Brescia - NorthernItaly). This paper considers the chemical characters of the triassic 《porphyrites》 of M. Guglielmo, whichlies between Trompia Valley and Iseo Lake. The chemical analyses show evidence of a serial characterwith calc-alkaline affinity not necessarily attributable to a geodynamic compressive regime. In fact, simi-lar calc-alkaline sequences can be interpreted as products of an extensional regime.