Concrete is widely used in in all types of construction; from domestic work to multi-storey office blocks and from buildings to bridges.
Concrete is a mixture of ;
Portland cement is the most common type of cement for construction and when mixed with water, forms a paste.This paste acts like glue and holds or bonds the aggregates together.
Combining water with a cementitious material forms a cement paste by the process of hydration. Less water in the cement paste will yield a stronger, more durable concrete; more water will give an freer-flowing concrete with a higher slump. Water must be clean, fresh and free from any dirt, unwanted chemicals or rubbish that can cause problems when setting or in causing premature failure of the structure.
Aggregates are of two basic types:
COARSE: crushed rock, gravel or screenings.
FINE: fine and coarse sands and crusher fines.
Admixtures are mixed into the concrete to change or alter its properties, ie the time concrete takes to set and harden, or its workability
Chemical admixtures are materials in the form of powder or fluids that are added to the concrete to give it certain characteristics not obtainable with plain concrete mixes. In normal use, admixture dosages are less than 5% by mass of cement, and are added to the concrete at the time of batching/mixing.The common types of admixtures are as follows.
There are inorganic materials that also have pozzolanic or latent hydraulic properties. These very fine-grained materials are added to the concrete mix to improve the properties of concrete (mineral admixtures), or as a replacement for Portland cement (blended cements).
03000 - Concrete Materials
03010 - Concrete Materials (general)
03020 - Concrete Admixtures
03030 - Concrete Finishing Materials
03100 - Concrete Formwork...
03100 - concrete formwork (general)
03125 - formliners
03200 - Concrete Reinforcement
03200 - Concrete Reinforcement (general)
03203 - Concrete Repair
03240 - Fiber Reinforced Concrete
03250 - Concrete Accessories
03250 - Concrete Accessories (general)
03260 - Cast-in-place Anchors & Inserts
03265 - Waterstops
03275 - Tool-driven Concrete Fasteners
03300 - Cast-In-Place Concrete...
03315 - Concrete Placement Systems & Equipment
03346 - Concrete Crack Control Equipment
03350 - Concrete Finishes
03360 - Specially Placed Concrete
03365 - Post-tensioning Systems
03370 - Concrete Curing
03372 - Nonshrink, Non-Corrosive, Aggregate Grout
03400 - Precast Concrete...
03410 - Precast, insulated foundation wall systems
03412 - Precast, Insulated Foundation Wall Systems
03450 - Architectural Precast Concrete
03490 - Closures & Setting Accessories
03500 - Cementitious Decks...
03500 - Cementitious Decks (general)
03510 - Gypsum Concrete
03600 - Grout
03650 - Cementitious Underlayment
03700 - Concrete Restoration & Cleaning
03800 - Mass Concrete Placement
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