دراسة مواد البناء البديلة فى منطقة البحر الأحمر: المواد البوزولانية

Abstract

Pozzolana is a materials that content Reactive Silica with Alumina which defines as Siliceous materials, also include ferroginous materials. In generally, this study aimed to estimate Alternative building materials ( pozzolanic materials ) and create new cementic materials such as Lime-Pozzolana Cement and Ordinary Portland-Pozzolana Cement . The results shows that there is no good and sufficient pozzolanic materials as Obsidian , Scoria, Diatomaceous Earth and Volcanic Ash , but some types of burnt clays and Rhyolite in addition to bricks Reject and miskeet Ash was shown . This study is subjected in Arbaat Delta clay , salloum Delta clay , Rhyolite Rocks , bricks Reject and miskeet Ask as Natural and artificial pozzolanic materials. The identification of above mentioned materials was carried out by using several methods includes Geological survey , Chemical Analysis and X-Rays . and physical properties tests for prepared cementic materials includes setting time , Expansion , Fineness and Compressive Strength . the aim of pozzolanic activily and its Reaction with lime and Ordinary Portland Cement . The physical properties tests of the prepared cementic material such as setting time , expansion ,Fineness , chemical analysis and X-Ray shows that Arbaat Delta clay , salloum Delta clay and bricks Reject are suitable from prepared mixtures Lime- Pozzolana cement (L .P.C) and Ordinary Portland- Pozzolana cement (O .P .P .C), as well as Comperessive Strength results during 28 days which as follows : Arabaat delta clay is 34.4 kN/mm², clay of salloum delta clay is 32.2 kN/mm², and bricks reject is 31.5 kN/mm² as averages of two samples for a mixture lime–pozzolan. As for the Ordinary Portland- Pozzolan cement, the results of the tests the Compressive Strength as follows: the Arbaat Delta clay is 35.6 kn/mm² , 34.2 kN/mm² for Saloum Delta, bricks reject is 32.1 kN/mm².as average of two samples . these result are suitble for pozzolanic materials but less in pozzolanic suitability than those of Obsidian , Scoria , Diatomaceous Earth and Volcanic Ash . Rhyolite rocks and the ash of miskeet trees contain crystalline silica, as was shown in X-Ray results , for this reason they have not a good results in Compressive Strength their results were very weak, where 19.7 kN/mm² and 3.1 kN/mm² respectively as the average of two samples for a mixture lime – Pozzolana cement and 22.1 2kN/mm² and 3.4 kN/ mm² for average of two samples of Ordinary Portland- Pozzolana cement .