Finishin

Finishin - Placing and Finishing Concrete Basic...

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Placing and Finishing Concrete
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Placing and Finishing Concrete Basic Requirements for Placing Concrete (1) Preserve concrete quality Water-cement ratio Slump Air-content Homogeneity Avoid separation of aggregate and mortar
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Placing and Finishing Concrete Basic Requirements for Placing Concrete (2) Avoid excessive horizontal movement Consolidate adequately Maintain sufficient placement capacity Choose the right equipment for the concrete
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Placing and Finishing Concrete Preparation Before Placing Includes: Trimming the subgrade
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Placing and Finishing Concrete Preparation Before Placing Includes: Moistening the subgrade
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Placing and Finishing Concrete Preparation Before Placing Includes: Compacting the subgrade
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Placing and Finishing Concrete Depositing Concrete DO NOT — (a) disturb saturated subgrades so bearing capacity is maintained (b) deposit on frozen subgrade Deposit continuously and as near as possible to its final position Rate of placement should be such that previously placed concrete has not set when the next layer is placed upon it
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Placing and Finishing Concrete Depositing Concrete Start placing along perimeter at one end with each batch discharged against previously placed concrete Do not — (a) dump in separate piles & then level and work together (b) deposit in large piles & then move horizontally into position These practices result in segregation (mortar flows ahead of coarser material) Slab Construction
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Placing and Finishing Concrete Depositing Concrete Discharging into previously placed concrete Effective use of wheelbarrows
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Placing and Finishing Concrete Incorrect Placement with Conveyor Belt Baffle Mortar Rock Mortar Mortar Rock Shallo w hopper
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Placing and Finishing Concrete Placement with Conveyor Belt Belt Scraper No Separation Provide at least 0.6 m (24 in.) headroom for downpipe, elephant trunk or equivalent
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Placing and Finishing Concrete Depositing Concrete Pavement Slab Concrete deposited in front of slip form paver by dump trucks Concrete spread evenly across the subgrade by the paver before consolidation and finishing
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Placing and Finishing Concrete Curb/Curb and Gutter Depositing Concrete Concrete deposited into hopper of slip form curb and gutter machine which then extrudes the concrete into the desired shape
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Placing and Finishing Concrete Depositing Concrete Deposit in horizontal layers of uniform thickness Reinforced — 150 mm to 500 mm Mass — 375 mm to 500 mm Consolidate each layer before next is placed Timely placement & consolidation prevents flow lines and cold joints Walls
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Placing and Finishing Concrete Horizontal Construction Joint
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Placing and Finishing Concrete Horizontal Construction Joints
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This note was uploaded on 12/15/2011 for the course CM 217 taught by Professor Rogers,m during the Fall '08 term at BYU.

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Finishin - Placing and Finishing Concrete Basic...

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