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The article presents a case study of the laser cutting which is considered to be a modern and safe for natural environment method of machining. It is a method that has been replacing conventional cutting in recent years. This is due to the fact that modern lasers are economical due to the demand for electricity, enable the processing of various materials and are often more effective, the machining is precise, repeatable and the laser as a tool is more durable than conventional. In the experiment described in the a...

Plaster and composites made up of gypsum have been extensively used in building for various purposes. This work aims to study the use of polypropylene (synthetic polymer), Alfa (Stipa tenacissima ) and plastic waste as fiber in the manufacture of plaster and mortar plaster . In this study, a Superplasticizer was used to improve the fluidity of the plaster grout and mortar plaster. The optimization of the dosage of superplasticizer of plaster grout without fiber was determined based on the mechanical strength tests...