concrete finishing. good vibrations there are many ways in which to finish concrete in order to get...
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CONCRETE FINISHING
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Good Vibrations
• There are many ways in which to finish concrete in order to get the desired finish.
• One the concrete is poured we need to ensure that all concrete faces are smooth and do not show the stones or sand that is embedded in the concrete.
• We want the faces to be smooth. This is done by vibrating the the concrete forcing the cement to the surface.
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Vibrating Concrete Con’t
• Increases compressive strength and bond between concrete and rebar and decreases concrete permeability
• Decreases cold joints, honeycombing, excessive entrapped air, and segregation
• Causes concrete within a circular field of action to act like a liquid
Stop Vibrating when:•The concrete surface takes on a sheen• Large air bubbles no longer escape
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Screeding
• Screeding brings the surface to the required elevation by striking off the excess concrete. Two types of screeds are used in concrete finishing operations:
• Hand screed
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Mechanical Screeding
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Floating• Bullfloating eliminates high and low spots and
embeds large aggregate particles immediately after strikeoff. This looks like a long-handled
straight edge pulled across the concrete.
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Power Floater
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Concrete Finish
• Concrete can be finished in several different ways:
• Smooth (basements, shop floors)
• Brushed (sidewalks, steps, porches)
• Stamped (sidewalks, patios, interior finish)
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Stamp Concrete
• Stamp concrete is a finish that is applied when the concrete has almost completely set up.
• Large stamp pads (with a pattern) are placed on the concrete and then stamped to make an impression.
• Colour, liquid or powdered is added to give the concrete more of a interlocking brick or natural surface look.
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