A spark plug (sometimes, in British English, a sparking plug,[1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine.
Top 10 amazing movie makeup transformations. A concrete finisherâs main job is to smooth concrete as soon as itâs been poured to ensure that it dries evenly and to make sure that the project as a whole achieves consistent results when it comes to final texture, thickness, and density.
Below are best practices that the American Concrete Institute and most experienced concrete professional recommend. 1  Make sure concrete is poured over a solid base. 2  A driveway slab should be no less then 5â³ in thickness. 3  Use 4000 psi concrete with a water reducer and low chert aggregates. Fiber and steel reinforcement should be used together or a high dosage of Macro fibers. Concrete finishing should be done after all the water on top of the surface (bleed water) is gone. Early finish will cause surface problems later.