Concrete Materials

CONCRETE is made by mixing: CEMENT WATER COARSE AND FINE AGGREGATES ADMIXTURES (if required). The aim is to mix these material...

CONCRETE is made by mixing:

  • CEMENT

  • WATER

  • COARSE AND FINE AGGREGATES

  • ADMIXTURES (if required).

The aim is to mix these materials in measured amounts to make concrete that is easy to:

  • TRANSPORT

  • PLACE

  • COMPACT

  • FINISH

and which will set, and harden, to give a strong and durable product. The amount of each material (ie cement, water and aggregates) affects the properties of hardened concrete.

CEMENT The cement powder, when mixed with water, forms a paste. This paste acts like glue and holds or bonds the aggregates together. There are six major types of cement:

  1. Type GP (General Purpose Portland cement)

  2. Type GB (General Purpose Blended Cement)

  3. Type HE (High Early Strength cement)

  4. Type LH (Low Heat cement)

  5. Type SR (Sulfate Resisting cement)

  6. Type SL (Shrinkage Limited cement)

Each type of cement will produce concrete with different properties. The most common types of cement are Type GP and Type GB. Blended cements contain portland cement and more than 5% of either fly ash, ground slag, silica fume, or a combination of these.

STORAGE Cement should be stored off the ground in a well-aired, clean, dry place. Wrapping the cement bags in plastic sheets gives extra protection, Bulk cement will normally be stored in silos.

AGGREGATES Aggregates are of two basic types:

  1. COARSE: crushed rock, gravel or screenings.

  2. FINE: fine and coarse sands and crusher fines.

Sand should be concreting sand and not brickies sand or plasterers sand. Aggregates should be:
STRONG and HARD A stronger, harder aggregate will give a stronger final concrete. Never use a crumble or flakey rock like sandstone.
DURABLE to stand up to wear and tear and weathering. CHEMICALLY INACTIVE so the aggregates don’t react with the cement. CLEAN Dirt or clay sticking to the aggregates will weaken the bond between paste and aggregates. GRADED Aggregates should range in size so that they fit together well. This gives a stronger and denser concrete. Rounded aggregates give a more workable mix. Angular aggregates
make concrete harder to place, work and compact, but can make concrete stronger.

STORAGE Aggregates should be stored where they will stay clean, separated from other materials and dry. If the aggregates are very wet use less water in the mix.

WATER Water is mixed with the cement powder to form a paste which holds the aggregates together like glue. Water must be clean, fresh and free from any dirt, unwanted chemicals or rubbish that may affect concrete. Many concrete plants now use recycled water.

Always check bore water before use. Don’t use sea water as it may rust the steel reinforcement in the concrete.

ADMIXTURES Admixtures are mixed into the concrete to change or alter its properties, ie the time concrete takes to set and harden, or its workability.

HOW THE PROCESS WORKS Measured amounts of the coarse and fine aggregates are mixed together. A measured amount of cement is added and mixed in. Enough water is added to make the mix workable. All the materials are then mixed together well. The cement powder and water form a paste which bonds the aggregates together like glue.

COMMENTS

Name

• compression couplers,1,• tension couplers,1,1997 UBC,1,56 days Concrete test,1,ADDICRETE,1,additives,1,administer computer networks,1,admixtures,1,Advises Subcontractors,1,alignment of the shafts,1,Allowable Stress Design,1,Anchor Bolts,1,Annual depreciation expense,1,approval of drawings,1,ASD,1,Assist in Quantity,1,Assist the Project Manager,1,Authority to Delegate,1,AutoCAD,2,AutoCAD to Etabs,1,bars,1,bars in a bundle,1,BASE ISOLATED DAMAGE,1,base plates,1,basement wall,1,Basic soil properties,1,basic wind speed,1,Beams Inspection Checklist,1,Bearing capacity,1,bell pile bottom,1,bent bars,1,Bitomeneous,1,Bowels,1,breaching spillway,1,BS 8007:1987,1,BS5400,1,BS6399,1,BS8007,1,BS8110-1997,1,buildings height,1,CALCULATION OF CRACK WIDTH,1,Canary Island Dates,1,cantilever footing,1,Carbon Equivalent,1,carbon test,1,cast in-situ,1,cast-in-place anchors,1,cast-in-place concrete pile,1,Cause-and-effect diagram,1,Chairs,1,Check sheets,1,Chemical Admixtures,1,Chute spillway,1,CIRIA,2,CIRIA Report 136,1,civil structures,1,Coal ash,1,collars,1,Collision Load,1,columns,3,columns and walls,1,Combination of combinations,1,combinations in Etabs,1,Company's Health,1,Compliant Towers platforms,1,compression test,1,compressive strength,1,concrete,4,concrete block buildings,1,CONCRETE IN HOT WEATHER,1,CONCRETE MOMENT FRAME,1,concrete pile,1,Concrete Rebound Hammer,1,Concrete Shrinkage,1,Concrete Slump Test,1,concrete walls,1,Construction and Stressing,1,construction drawings,1,Construction joints,1,Construction Manual,1,continuous external restraint,1,continuous slabs,1,contract planresponsibilities of QA/QC,1,Contracts Manager,1,cooling pipe system,1,Corner reinforcement,1,Cost Plus Award Fee,1,Cost-reimbursable,1,COUPLED SHEAR WALL,1,Couplers,1,couplers in columns,1,CP3,1,CRACK WIDTH,1,Creep,1,CURING,1,day to day work progress,1,Dead load and Self-weight,1,Deck,1,Deflection,1,Deflection discussion,1,Deflection in Prestressed,1,deformed bars,1,Demolition,1,Design Requirements,1,designing a tall building,1,Designs projects,1,detailed review,1,detailing and implementation,1,Development length,1,different codes in one structure,1,Differential elastic shortening,1,dimensions,1,DIRECT TENSION,1,Draftsman responsibilities,1,drawings and specifications,1,Drift Limitations,1,Drop beams,1,dust loads,1,dust on roof,1,Dynamic Pile Head,1,dynamic wind pressure,1,Early age Crackwidth,1,early strength cement,1,Earth pressure,1,Earthquake Design,1,earthquakes,1,EBT adhesive sealant,1,Elastic Shortening,1,electrical and manual,1,elevator requirement,1,Elevators,1,Encasement of pipes,1,end plate connection,1,Energy dissipater,1,engineering design,1,Environmental procedures,1,epoxy compound,1,Epoxy grout,1,equipment performance records,1,Error and warning free model,1,Errors in Etabs,1,establishment of construction,1,Estimating Flow Standard,1,Etabs,2,Etabs Design,1,ETABS to ROBOT,1,excavation,1,Excavation slopes,1,external concrete surfaces,1,Finishing of slip-forms,1,Fire,1,Firm Fixed Price,1,Fixed platforms,1,Fixed Price Incentive Fee,1,Fixed Price with Economic,1,Flexible Joints,1,Flexible pipes,1,floors,1,Flow charts,1,Fly ash,1,Foundation analysis,1,Foundations,1,framed openings,1,Free over fall spillway,1,FRP,1,FRP advantages,1,FRP disadvantages,1,FRP technology,1,full length bar,1,General Notes,1,Geophone sensor,1,Hammer Schmidt Type,1,HDP,1,Health and Safety procedures,1,High Early Strength Portland Cement,1,High quality additives,1,high rise / tower,1,highly effective,1,Histograms,1,hooked bars,1,Horizontal steel,1,Human Comfort,1,hydraulic,1,hydraulic jump,1,Hydraulic resistance,1,Hydro technical tunnels,1,IBC/ASCE,1,immediate reaction,1,importance of Plasticizers,1,Importing,1,IMS,1,Inspection Checklist,6,INSTRUMENT CALIBRATION,1,inter-story drift,1,interest payments,1,IT engineer responsibilities,1,Jack-up Platforms,1,Jacking Systems,1,Japanese code for escalators,1,Kicker,1,largest oil platform,1,lateral forces,1,lateral loads,1,LFD,1,lifting hooks,1,Load Factor Design,1,load resisting elements,1,load-bearing wall,1,Loading,1,Loads and Resistances,1,LRFD,1,Maintain contract database,1,Maintains close scrutiny,1,maintenance cost,1,Makes recommendations,1,manage,1,manufacturer,1,manufacturing process,1,Maximum allowable slopes,1,maximum deflection,1,maximum difference,1,maximum pressure,1,maximum reinforcement,1,maximum temperature,1,Mechanical couplers,1,Mechanical damage,1,membrane floors,1,Metal sleeves swaged,1,Method of dissipation,1,METHOD OF TESTING,1,Method statement,2,Mineral Admixtures,1,minimize the seepage,1,minimizing the cost,1,minimum eccentricity moment,1,Minimum reinforcement,1,mixing concrete,1,modelling in Etabs,1,Monitors performance,1,monthly invoice,1,Monthly Safety Report,1,multi-storey buildings,1,multistory buildings,1,Natural frequency,1,Necessity of tunnel lining,1,new structural systems,1,O&M,1,of concrete block buildings,1,office buildings,1,Office Tall Buildings,1,offshore platforms,1,oil platform,1,oil rigs,1,on beams from loaded slab can be achieved by defining the slab as a membrane,1,opening reinforcement,1,ordinary Portland cement,2,Other bars,1,Overlap,1,overlap locations,1,Oversee and review,1,palm trees weight,1,parallel threads,1,parapet,1,Perform data backups,1,Performance Bonds,1,Performs design drafting,1,physical properties,1,Pile Dynamic Test,1,Pile Head Preparation,1,Pile Integrity Testing,1,Pile Shaft Overbreak,1,Pindos,1,Pipe Classifications,1,PLACING,1,Placing boom,1,Plan and prioritize work,1,Planning Engineer,1,plant and equipment,1,Plant and Equipment Engineer,1,plaster walls,1,Platform types,1,pneumatic,1,Post-Tensioning Grouting,1,Pour strip,1,precast panel,1,Prepares monthly report,1,Pressure Ratings,1,Prestressed Concrete,1,prevent uplift,1,principal load resisting,1,procedure of fixing,1,Project Coordinator,1,Project manager assignment,1,project schedule,1,project's compliance,1,Provides technical expertise,1,provisional Sum,1,PT slabs,2,pump,1,PVC,1,QA,1,QA/QC Engineer,1,QC,1,Quality,1,raft foundations,1,Raft Slab Inspection Checklist,1,reaction as an engineer,1,rebound hammer,1,recommended tests,1,Recorded experience,1,Reinforced concrete columns,1,reinforcement,1,Reinforcement at openings,1,reinforcing bars,2,reinforcing-steel,1,Residential Tall Buildings,1,RESISTING SYSTEMS DAMAGE,1,Retaining Wall Inspection Checklist,1,Retaining walls,1,retarder,1,Review contract documents,1,review contracts,1,review expiring contracts,1,Reviews accidents,1,reviews contract drafts,1,Reviews shop drawings,1,Reviews the terms and conditions,1,Rice husk ash,1,rigid foundation,1,Rigid pipes,1,Road layers,1,Robot Millennium,1,Roles and Responsibilities,8,Roller bucket,1,Rough Order of Magnitude,1,round deformed bars,1,Rules of thumb,1,saddle beams,1,Safe 14,1,Safety Manager,1,sample letter,3,sand,1,SAP2000,1,Schmidt Hammer,1,Seismic Design Principle,1,SEISMIC RESISTING SYSTEMS,1,seismic zone factor,1,Semi-structural welding,1,Semi-submersible Platforms,1,Senior Architect,1,Senior Contracts Engineer,1,Sequential Loading,1,Set work program,1,Seven Basic Quality Tools,1,shallow foundation,1,Shell,1,Ship-board Rigs platforms,1,shortening of columns,1,Shrinkage,1,Shrinkage and Temperature,1,Side channel spillway,1,simply supported,1,Site engineer responsibilities,1,site facilities,1,SK Gosh,1,Ski-jump,1,slab assignment,1,slabs,2,Slabs Inspection Checklist,1,slings,1,slip forms,1,Slip-form,1,Slip-form construction,1,slip-forming,1,smooth finish,1,soffit slabs,1,Soil classification,1,Soil Sloping Systems,1,speed of erection,1,Spring Force,1,standard size bolts,1,Static load,1,Static load multiplier,1,steel beam,1,Steel Columns,1,steel quantity,1,steel stress,1,Stiffness,1,stiffness and resistance,1,stilling basin,1,Strap footing,1,Strength and Stability,1,Stress on soil in etabs,1,Stressing sequence,1,Striking formworks,2,Strip footing,1,Strong Column,1,structural construction process,1,structural design spreadsheet,1,Structural Details,1,structural engineers,1,Structural Provisions,1,structural purposes pipes,1,strukts spreadsheets,1,Subcontract Agreement,1,Super-plasticizers,2,surfactants,1,Tack welding,1,Tall Building,1,tall buildings,1,Tallest buildings,1,taper-cut threads,1,Tdr Test Accuracy,1,Technical Engineer,1,technical submittals,1,test hammer,1,Test on Piles,1,Test specimens,1,TESTING,1,Thermal Expansion,1,threaded rods with nuts,1,time for completion,1,Top bars,1,torsion-load test,1,Total Shortening,1,tower cranes,1,Tower cranes installation,1,Transform AUTOCAD drawings,1,trough spillway,1,Trump Tower,1,Tunnel,1,tunnel lining,1,type of concrete,1,Types of contracts,1,types of foundation,1,Types of shallow foundation,1,Types of spillways,1,Types of waterproofing,1,Ultra Ever Dry,1,Uniform loads Safe 14,1,uniform thickness,1,Uplift Force,1,uplift test lateral-load test,1,vertical load resisting,1,Voided Biaxial Slabs,1,wall openings,1,walls,2,Warning,1,Water curing,1,Weak Beam Concept,1,Wedge locking sleeves,1,weekly and monthly program,1,weekly and monthly report,1,Welding of reinforcement,1,Welding procedures,1,What teachers never taught us,1,wind and seismic,1,Wind loads,1,Wind simulation,1,WOOD SHEAR WALL,1,workability,2,Workshop repair,1,
ltr
item
strukts: Concrete Materials
Concrete Materials
http://2.bp.blogspot.com/-K0ZEuBtXqRM/VRRRiKdQxuI/AAAAAAAABh8/_MBU_2ubze4/s320/Untitled.png
http://2.bp.blogspot.com/-K0ZEuBtXqRM/VRRRiKdQxuI/AAAAAAAABh8/_MBU_2ubze4/s72-c/Untitled.png
strukts
http://www.strukts.com/2012/05/concrete-materials_82.html
http://www.strukts.com/
http://www.strukts.com/
http://www.strukts.com/2012/05/concrete-materials_82.html
true
7606260228666216043
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy