Development of a new hydraulic binder (composite cement) based on a mixture of natural Pozzolan active 'PN' and Pure Limestone 'P,Lime': Study of the physical-chemical and mechanical properties

The aim of the present work is to valorize a local and natural sources,such as the natural pozzolan (pn) and the pure limestone (p,lime) of the region of amran - yemen in using them in the production of cement and concrete to reduce the energy and raw material consumed in a first time and minimize the emission of the greenhouse gases (ghgs). therefore,in this work we have studied the influence of mineral additions in pn and p,lime in cement,partially substituting the clinker by these materials in powder form and fine crushed,while fixing the total addition at 40% of the addition which make up the mixture in pn and p,lime. the variation of the percentage was fixed at 5% to lead the following formulations: f1(0% pn + 0% p,lime),f2(40% pn + 0% p,lime),f3(35% pn + 5% p,lime),f4(30% pn + 10% p,lime),f5(25% pn + 15% p,lime),f6(20% pn + 20% p,lime),f7(15% pn + 15% p,lime),f8(10% pn + 30% p,lime),f9(5% pn + 35% p,lime),and f10(0% pn + 40% p,lime) in weight of clinker. the physical-chemical properties of the new formulations of cement based to pn and p,lime,to know (the fineness by blaine specific surface area,the density,the loss on ignition),the physical properties of fresh cement paste,such as (the setting time,the content water) and the mechanical strength of the mortar and/or concrete were studied. the obtained results by the different methods of physical-chemical analyses such as (xrf / xrd / calcination in the air,the absolute density,the fineness by the air permeability),physical properties (the vicat of water content and setting time) and the mechanical properties of the different formulations show that there was an improvement in the fineness,the setting time and mechanical properties. © 2017,university of mohammed premier oujda morocco.