logging in or signing up Concrete Mertice Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 5047 Category: Education License: All Rights Reserved Like it (8) Dislike it (0) Added: February 29, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: vishnu.2404 (19 month(s) ago) please allow me to download it! Saving..... Post Reply Close Saving..... Edit Comment Close By: ashokbollineni (20 month(s) ago) nice Saving..... Post Reply Close Saving..... Edit Comment Close By: imdiyas (26 month(s) ago) i also request to allow mw to download this presentation Saving..... Post Reply Close Saving..... Edit Comment Close By: nzb123 (28 month(s) ago) I request you to allow me to download this presentation as powerpoint Saving..... Post Reply Close Saving..... Edit Comment Close By: hchih (29 month(s) ago) 9aaaa Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript FRESH CONCRETE: FRESH CONCRETE To the designer, fresh concrete is of little importance. To the constructor, fresh concrete is all-important, because it must be mixed, transported, placed, supported, consolidated, finished, and cured.FRESH CONCRETE: FRESH CONCRETECEMENT TRUCK: CEMENT TRUCKCONCRETE PLANT STANDARDS: CONCRETE PLANT STANDARDS Cement of cementitious materials shall be batched by weight. Aggregates shall be batched by weight. Water shall be batched by weight or volume.BATCH PLANT: BATCH PLANT Accurately proportions aggregate and cement. Water is measured in the mixer truck.MIXER TRUCK: MIXER TRUCKMIXER TRUCK: MIXER TRUCKMIXER TRUCK: MIXER TRUCKHAULING CONCRETE: HAULING CONCRETE Transit mixer truck Maximum duration 1 ½ hr or 300 drum revolutions from introduction of water until placement.MIXER DRUM: MIXER DRUMMIXER DRUM: MIXER DRUMCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANT Accurately proportions aggregate, cement and water, and mixes these materials automatically.CENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTQuantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specifications may simply define strength: 28 day strength (i.e. 2,500, 3,000 or 6,000 psi)Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specs may define other requirements: Maximum size aggregate (i. e. 1½ in.) Minimum cement content (sacks per cy or lb/cy) Maximum water cement ratio by weight or in gallons per sack of cement)Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water One sack of cement weights 94 lbs. One barrel of cement contains four sacks Specific gravity of cement, 3.15Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specific gravity (average) of course or fine aggregate, 2.65 Water weights 62.4 lb/cf One cf of water = 7.48 U.S. gal. One gallon of water weights 8.33 lb.Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Usually the proportion of fine aggregate varies between 25 and 45% of total aggregate volume. Absolute volume of any ingredient in cubic feet equals:Quantity Example: Quantity Example Max. size aggregate 1½ in. Min. cement content 6.0 sacks/cy Max. water/cement ratio 0.65Quantity Example: Quantity Example Cement/cubic yard 6.0 sacks 6 sacks 94 lb/sack = 564 lb Absolute volume of cement Quantity Example: Quantity Example Water/cubic yard 564 lb 0.65 = 366.6 lb Absolute volume of water Quantity Example: Quantity Example Absolute volume of 1 cy of concrete = 27.0 cf Assume 6% air voidsQuantity Example: Quantity Example Absolute volume of aggregate =16.63 cfQuantity Example: Quantity Example Absolute volume of sand Assume fine aggregate 35% Weight fine aggregate = 962.4 lb/cyQuantity Example: Quantity Example Absolute volume of coarse aggregate Weight course aggregate = 1,787.5 lb/cyQuantity Example: Quantity Example Assume a 700 cy placement. Cement required 197.4 tnQuantity Example: Quantity Example Assume a 700 cy placement. Water required 30,807 gallonsQuantity Example: Quantity Example Assume a 6 hours for the placement. Or 86 gallons/minuteQuantity Example: Quantity Example Assume a 700 cy placement. Sand required 337 tnQuantity Example: Quantity Example Assume a 700 cy placement. Course aggregate required 626 tnQuantity Example: Quantity Example Assume a 700 cy placement. How much for waste??HAULING CONCRETE: HAULING CONCRETE Wet Central Mix Concrete Using dump or agitor trucks, 30 minute maximum haul at 70 to 90 degrees. CABLE & BUCKET SYSTEM: CABLE & BUCKET SYSTEMCABLE & BUCKET SYSTEM: CABLE & BUCKET SYSTEMCONVEYOR SYSTEM: CONVEYOR SYSTEMCONVEYOR SYSTEM: CONVEYOR SYSTEMPUMPING: PUMPINGSLIPFORM PAVER: SLIPFORM PAVERSLIPFORM PAVER: SLIPFORM PAVERPAVING OVER DOWELS: PAVING OVER DOWELSPAVING OVER REBAR: PAVING OVER REBARSIDE FEEDER: SIDE FEEDER Side feeder when paving over dowels or rebar.PAVING the MIDDLE LANE: PAVING the MIDDLE LANECONCRETE: CONCRETESMOOTHNESS: SMOOTHNESS Specifications require smoothness. A “Profileometer.” is used to measure smoothness.SMOOTHNESS: SMOOTHNESS Monitor supply of concrete. Mix design is but a prerequisite. Many of the problems occurring in pavements concern what is done with the mix.SMOOTHNESS: Control density. Vibration is a vital part of the paving process. SMOOTHNESS Paver Vibrators SMOOTHNESS: SMOOTHNESS Weight & Traction The principle which makes a slipform paver work is the consolidation of the concrete in a confined space.SMOOTHNESS: SMOOTHNESS Paver attitude. The paver attitude is the attack angle in relation to the concrete.SAWING JOINTS: SAWING JOINTSSAWING JOINTS: SAWING JOINTS Saw depth Resulting crackSLIPFORM PAVER: SLIPFORM PAVERCONCRETE PLACEMENT: CONCRETE PLACEMENT Very important to prevent segregation of the coarse aggregate during placement.CONSOLIDATION: CONSOLIDATION Consolidation is normally achieved through the use of mechanical vibrators.SCREED: SCREEDBRIDGE DECK: BRIDGE DECKFORM SYSTEMS: FORM SYSTEMSTEMPERATURE: TEMPERATURE When the temperature of fresh concrete exceeds 85 or 90°F, the resulting strength and durability of the concrete can be reduced.TEMPERATURE: TEMPERATURE Most specifications require that concrete be placed at a temperature of less than 90°F. In hot weather it may be necessary to cool the ingredients before mixing CURING: CURING Do not forget about the curing requirements. LABOR: LABOR Carpenters Labors Cement masons Ironworkers Teamsters Operating engineers You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Concrete Mertice Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 5047 Category: Education License: All Rights Reserved Like it (8) Dislike it (0) Added: February 29, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: vishnu.2404 (19 month(s) ago) please allow me to download it! Saving..... Post Reply Close Saving..... Edit Comment Close By: ashokbollineni (20 month(s) ago) nice Saving..... Post Reply Close Saving..... Edit Comment Close By: imdiyas (26 month(s) ago) i also request to allow mw to download this presentation Saving..... Post Reply Close Saving..... Edit Comment Close By: nzb123 (28 month(s) ago) I request you to allow me to download this presentation as powerpoint Saving..... Post Reply Close Saving..... Edit Comment Close By: hchih (29 month(s) ago) 9aaaa Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript FRESH CONCRETE: FRESH CONCRETE To the designer, fresh concrete is of little importance. To the constructor, fresh concrete is all-important, because it must be mixed, transported, placed, supported, consolidated, finished, and cured.FRESH CONCRETE: FRESH CONCRETECEMENT TRUCK: CEMENT TRUCKCONCRETE PLANT STANDARDS: CONCRETE PLANT STANDARDS Cement of cementitious materials shall be batched by weight. Aggregates shall be batched by weight. Water shall be batched by weight or volume.BATCH PLANT: BATCH PLANT Accurately proportions aggregate and cement. Water is measured in the mixer truck.MIXER TRUCK: MIXER TRUCKMIXER TRUCK: MIXER TRUCKMIXER TRUCK: MIXER TRUCKHAULING CONCRETE: HAULING CONCRETE Transit mixer truck Maximum duration 1 ½ hr or 300 drum revolutions from introduction of water until placement.MIXER DRUM: MIXER DRUMMIXER DRUM: MIXER DRUMCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANT Accurately proportions aggregate, cement and water, and mixes these materials automatically.CENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTCENTRAL MIX PLANT: CENTRAL MIX PLANTQuantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specifications may simply define strength: 28 day strength (i.e. 2,500, 3,000 or 6,000 psi)Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specs may define other requirements: Maximum size aggregate (i. e. 1½ in.) Minimum cement content (sacks per cy or lb/cy) Maximum water cement ratio by weight or in gallons per sack of cement)Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water One sack of cement weights 94 lbs. One barrel of cement contains four sacks Specific gravity of cement, 3.15Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Specific gravity (average) of course or fine aggregate, 2.65 Water weights 62.4 lb/cf One cf of water = 7.48 U.S. gal. One gallon of water weights 8.33 lb.Quantities of Cement, Aggregate and Water : Quantities of Cement, Aggregate and Water Usually the proportion of fine aggregate varies between 25 and 45% of total aggregate volume. Absolute volume of any ingredient in cubic feet equals:Quantity Example: Quantity Example Max. size aggregate 1½ in. Min. cement content 6.0 sacks/cy Max. water/cement ratio 0.65Quantity Example: Quantity Example Cement/cubic yard 6.0 sacks 6 sacks 94 lb/sack = 564 lb Absolute volume of cement Quantity Example: Quantity Example Water/cubic yard 564 lb 0.65 = 366.6 lb Absolute volume of water Quantity Example: Quantity Example Absolute volume of 1 cy of concrete = 27.0 cf Assume 6% air voidsQuantity Example: Quantity Example Absolute volume of aggregate =16.63 cfQuantity Example: Quantity Example Absolute volume of sand Assume fine aggregate 35% Weight fine aggregate = 962.4 lb/cyQuantity Example: Quantity Example Absolute volume of coarse aggregate Weight course aggregate = 1,787.5 lb/cyQuantity Example: Quantity Example Assume a 700 cy placement. Cement required 197.4 tnQuantity Example: Quantity Example Assume a 700 cy placement. Water required 30,807 gallonsQuantity Example: Quantity Example Assume a 6 hours for the placement. Or 86 gallons/minuteQuantity Example: Quantity Example Assume a 700 cy placement. Sand required 337 tnQuantity Example: Quantity Example Assume a 700 cy placement. Course aggregate required 626 tnQuantity Example: Quantity Example Assume a 700 cy placement. How much for waste??HAULING CONCRETE: HAULING CONCRETE Wet Central Mix Concrete Using dump or agitor trucks, 30 minute maximum haul at 70 to 90 degrees. CABLE & BUCKET SYSTEM: CABLE & BUCKET SYSTEMCABLE & BUCKET SYSTEM: CABLE & BUCKET SYSTEMCONVEYOR SYSTEM: CONVEYOR SYSTEMCONVEYOR SYSTEM: CONVEYOR SYSTEMPUMPING: PUMPINGSLIPFORM PAVER: SLIPFORM PAVERSLIPFORM PAVER: SLIPFORM PAVERPAVING OVER DOWELS: PAVING OVER DOWELSPAVING OVER REBAR: PAVING OVER REBARSIDE FEEDER: SIDE FEEDER Side feeder when paving over dowels or rebar.PAVING the MIDDLE LANE: PAVING the MIDDLE LANECONCRETE: CONCRETESMOOTHNESS: SMOOTHNESS Specifications require smoothness. A “Profileometer.” is used to measure smoothness.SMOOTHNESS: SMOOTHNESS Monitor supply of concrete. Mix design is but a prerequisite. Many of the problems occurring in pavements concern what is done with the mix.SMOOTHNESS: Control density. Vibration is a vital part of the paving process. SMOOTHNESS Paver Vibrators SMOOTHNESS: SMOOTHNESS Weight & Traction The principle which makes a slipform paver work is the consolidation of the concrete in a confined space.SMOOTHNESS: SMOOTHNESS Paver attitude. The paver attitude is the attack angle in relation to the concrete.SAWING JOINTS: SAWING JOINTSSAWING JOINTS: SAWING JOINTS Saw depth Resulting crackSLIPFORM PAVER: SLIPFORM PAVERCONCRETE PLACEMENT: CONCRETE PLACEMENT Very important to prevent segregation of the coarse aggregate during placement.CONSOLIDATION: CONSOLIDATION Consolidation is normally achieved through the use of mechanical vibrators.SCREED: SCREEDBRIDGE DECK: BRIDGE DECKFORM SYSTEMS: FORM SYSTEMSTEMPERATURE: TEMPERATURE When the temperature of fresh concrete exceeds 85 or 90°F, the resulting strength and durability of the concrete can be reduced.TEMPERATURE: TEMPERATURE Most specifications require that concrete be placed at a temperature of less than 90°F. In hot weather it may be necessary to cool the ingredients before mixing CURING: CURING Do not forget about the curing requirements. LABOR: LABOR Carpenters Labors Cement masons Ironworkers Teamsters Operating engineers