الفهرس 
Recycling of marble and granite waste in the production of vitrified clay pipes
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Abstract
Marble and Granite industry powder wastes have high alkaline nature that causing serious damage to the environment. Recycling of these wastes into production of vitrified clay pipe as a partial replacement of the standard clay pipe mixture was investigated. Samples consisting of standard pipe mixture and waste content varying from 0-35% were formed using marble and granite powder waste individually. They were molded, dried and fired at temperatures of (1000, 1100, 1150, 1200 and 1250 {u00B0}C) for 3 hour. Different tests were conducted on clay pipe combined wastes specimens so as to evaluate the suitability of addition of wastes in the production of vitrified clay pipes. Tests including plasticity, linear drying shrinkage and modulus of rupture were performed on green unfired bodies. While, for fired bodies; linear firing shrinkage, Loss on ignition, bulk density, apparent porosity, water absorption and bending strength were examined. The results concluded that firing at 1200{u00B0}C for 3 hours was the ideal condition for incorporating marble and/or granite fine waste with certain composition into the clay pipe mixture. It was found that the addition of 20 wt. % of marble waste to the standard mix gave sample conforming to standard values. While, 35 wt. % of granite waste was the optimum addition into typical standard mixture