Saad S. Manufacturing technology of concrete pipe details for the reclamation systems of Lebanon.

The thesis is devoted to studying the possibility of using concrete unreinforced pipes for underground distribution irrigation systems of pipelines transporting water in a gravity-pressure mode, determining the necessary strength of concrete for pipes laid in the ground, so that the concrete pipe in terms of strength corresponds to a reinforced concrete pipe, and establishing how effective such a technical solution is. The properties of modified fine grained concrete with polypropylene fiber on the basis of multicomponent binder are studied. It is established that the best option in terms of physical and mechanical parameters is the introduction of wet gas treatment sludge in the amount of 15%. Further increase in its content, slightly affects the strength of the property, and its introduction is complicated. Based on the analysis, a new method for the production of concrete pipes by vibrovacuuming was developed, which allows to increase the strength of concrete products due to stronger compaction of concrete components, removal of 30-40% of the liquid phase in the mixture and increase the contact zone between aggregate and astringent. Based on technical and economic analysis, it is proved that the mass introduction into production of the proposed modified fiber reinforced concrete pipelines will solve an important problem, the solution of which can further reduce the cost of construction of reclamation systems and will be an additional significant reserve of material savings and financial costs.