Card Set Information
Cement (Kiln fired limestone with small amounts of clay and other materials that is ground into powder)
Aggregate (Fine, coarse)
Portland Cement Types
Type 1 - normal Portland cement
Type 2 - moderae Portland cement which is resistant to moderate sulfate action
Type 3 - high-early-strength
Type 4 - low-heat
Type 5 - sulfate-resistant
made with expanded shale or slate aggregate
perlite aggregate or foaming agent
Material added to concrete to alter its properties, ex: air-entraining agents, accelerators, surface-active agents or sufactants, water-reducing agents, superplasticizers, coloring agents, etc
Adds air bubbles to the concrete's cement paste
Goal is to reduce the cracking of concrete during freeze/thaw cycles.
Increases workability and reduces segregation and bleeding in fresh concrete.
Decreases the water-cement ratio, decrease cement content, decrease the water needed to produce a certain slump, or increase slump.
Strength of the concrete increases when water reducers are added because water-cement ratio decreases.
Tendency to increase drying shrinkage
Gives the concrete the ability to flow, increases the slump while maintaining cohesion
Good for thin-section placement, dense laid steel areas, underwater placements, etc
Speeds up the rate of setting and the development of strength.
: Calcium chloride.
Possible discoloration, shrinkage, reinforcement corrosion
Increase the setting time of concrete
Does not decrease the concrete temp, it increases the bleeding rate and capacity.
Slows rust formation on reinforcing steel.
Commonly used in parking structures, marine structures and bridges where chloride salts is prevalent.
Added for aesthetic purposes and some safety apps.
no more than 10% of the weight, but less than 6% will not change the properties.
Glasslike particles resembles Portland cement
Increases the workability of concrete, acting like a lubricant.
Good for forming crevices and small openings
Used as an aggregate in concrete.
Similar consistancy to sand.
Steel reinforcing bars
Most commonly used in concrete
Heavy-duty reinforcement agains tension and flexure for concrete
To counter corrosion, rebar is available in other forms besides common steel.
Concrete reinforcing fibers
Steel - strength
Glass - the most tensile strength
Synthetic/Plastic - most common, polypropylene
Natural - comparable strength but some are lacking
hot-rolled steel sections with ribs or deformations for better mechanical bonding
Sizes refer to diameter in 1/8"
Not as heavy duty as rebar
Main purpose is to control concrete cracking, not eliminate it altogether.