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C-8 concrete cslb study guide Air-entrained concrete Ready mixed concrete with small bubbles of air trapped throughout the mixture to make it stronger
Bullfloat A long handled wide float used to iron out screed marks and to ease finishing of the surface by making the aggregate float to the surface
Caisson A concrete pile constructed for use underwater
CALCIUM CHLORIDE The chemical most commonly used to hasten the setting of Portland cement.
Cold Joint Joint formed when a concrete surface hardens before the next batch of concrete is placed against it
Control Joint A groove in a concrete structure made to predetermine the location of cracks due to shrinkage
Darby A flat trowel-like tool used to smooth out the surface of the concrete soon after the surface has been bull floated
Edger a trowel having a long,curved lip for rounding the edges of a fresh concrete slab as it,begins to set . groover Tool used to cut expansion joints into slab to control cracking that may occur when the concrete shrinks . Isolation Joint A joint positioned so as to separate concrete from adjacent surfaces or into individual structural elements which are not in direct physical contact, such as an expansion joint. . Keyway A recess in one pour of concrete to help the next pour's shear strength mechanically ties the pour together
Ponding Curing concrete by flooding the surface with water
prestressed concrete concrete poured around a steel member which is put in tension when the pour is made
Scaling the peeling away of the surface concrete
Type III Concrete Used during cold weather, high early strength and fast curing
Type IV Concrete Concrete used when low heat of hydration is required. Slow curing
Type V Concrete Concrete used when high sulfate resistance is required. near sea water
what is the formula for cubic feet? length x width x height
How many cubic feet are in a cubic yard? 27 cubic feet per yard
what is the maximum plant to pour time? 1 1/2 hours from plant to pour
minimum water temperature allowed when placing concrete underwater 45 degrees
stakes are used for: temporary height
concrete should be trowelled when no surface water appears after floating
main reason for dusting adding water to the surface before finishing
what is the height required for guardrails around a trench 43"-45"
when do you have to wear hearing protection? anything over 90db
hard boards should be soaked at least 12hours before pouring
Coarse leveling of concrete is called screeding
Reinforced load bearing walls should a minimum thickness of : 6 to 8 inches
What is minimum number rotations for truck mixed concrete before pouring 70-
5% grade
what does the slump test indicate? wetness or dryness of concrete (stiffness)
a bridge deck should be: poured with a stiff mix
how far should rebar be from bottom of the footing? 3 inches
the result of a slump test should be kept for 3 years
how soon after you mix concrete should you pour it? 1/2 hour
what should you do if the tempature drops when punting concrete speed up the pour
what is the maximum deflection allowed in columns piers walls per 10ft? 1/4 inch per 10ft
concrete must cure for at least 24 hours before exposing to freezing temperatures
Reducing the hose size when pumping concrete causes? blockage
what is the minimum width of a sidewalk intended for handicap access? 48 inches
which of the following prevents leaching and efflorescene? high density cocrete
what is the maximum slope of a handicap ramp? 8.3% what does EF on a plan mean? each face what is a chamfering strip and what is it used for? Chamfer strips Chamfer strips are used in forms to give a chamfered edge to concrete corners. Resists warping and twisting. Nails and screws may be driven into wood chamfer strip with a minimum of splitting. (Beveling edges of concrete)
A grade beam is most similar to: a continuous footing
The minimum thickness for a slab on grade permitted by the UBC is: 3 1/2 inch
when earth is scarified it is: mixed up
what is freeze thaw? The Freeze-thaw reaction is a process which takes place when water flows through concrete and the temperature becomes cold enough that the H2O molecules freeze.
What is PCP concrete, and for what do people use it? PCP stands for Pre-stressed Concrete Pavement.
It is the type of pavement in which precast concrete panels are used to construct it. PCP is mainly applied for repair and replacement of the concrete pavement on high-traffic roads
What is a plot plan? A drawing showing the location of a building on its plot of land and various details. It is also know as a site plan
When should soil be inspected when trenching?
Before workers enter a trench, a soil analysis should generally be conducted to determine the appropriate employee protection methods such as sloping, benching, shoring or shielding
what is a burlap drag finish? Produced by trailing moistened coarse burlap from a device that allows control of the time and rate of texturing - usually a construction bridge that spans the pavement. Produces 1.5-3 mm (1/16-1/8 in.) deep striations
what is a bitumonous filler? Bitumen filler board is primarily used as an expansion joint filler in concrete structures, where it provides a flexible, waterproof seal that can accommodate movement due to temperature changes, settling, or seismic activity.
what is dry pack concrete? Dry pack mortar is a stiff sand-cement mortar that is typically used to repair small areas that are deeper than they are wide
what is the LEED program? LEED stands for Leadership in Energy and Environmental Design and is the most used green building rating system in the world. Available for virtually all building types, LEED provides a framework for healthy, efficient, and cost-saving green buildings.
