Glencoe: Section 59 Flashcards
Concrete for the floor slab and bearing wall footings should be made with
durable, well-graded aggregate.
Concrete for the floor slab and bearing wall footings should have a compression strength of at least
2500 psi
Concrete for the floor slab and bearing wall footings should be workable so that
it doesn’t develop large air pockets
One method of venting radon gas is from beneath
a slab, through a vent up to the roof
If necessary the proportion of X and Y should be adjusted to obtain a more workable concrete mix
fine and coarse aggregate
Concerete should not drop more than X’ to the ground as its delivered by a ready-mix truck because
4’
because large aggregate can settle unevenly.
After placing concrete, it should be
made to settle by vibrating, tamping, or spading.
Always discuss X with concrete truck operator before placing concrete
hand signals so he knows when to stop
basement concrete slabs are typically placed after
all improvements such as sewer and water lines have been connected
Basement floor slabs should be no less than X and should
3 1/2” thick and should slope towards a floor drain.
Screed
a long length of metal or wood that is used to strike off (level) the concrete.
How do you move the screed
pulled by hand and at the same time back and forth in a sawing motion.
Screed strips
guiding 1” pipes driven into subgrade to hold the screed level.
After the screed strips (pipes and stakes) have been removed
a float is then used to pack the concrete into any gaps
What is important in establishing a safe entry into the garage:
the grade, width, and radius of curves in a driveway.
Driveways that have a grade more than X percent (X” rise in 100 lineal feet) should not be covered with gravel because
7% (7” rise in 100 lineal feet)
the gravel will gradually wash away.
Driveways that have a grade more than 7 percent, X is used instead of gravel
concrete or asphalt
A common type of concrete driveway is the X
full width slab
Concrete on driveways should be given an X
it should also be Y
a broom finish to prevent both cars and people from slipping.
It should also be crowned, slightly higher at center than edges to drain water.
A gravel base for driveways in not ordinarily required on
sandy, undisturbed soil.
If the area of a driveway has recently been filled, the fill, preferable gravel should
settle first and be well tamped
With the exception of sandy, undisturbed soil, a gravel base should be used
on all other soils
Concrete for driveways should be X thick
and a Y is not required
5” thick
vapor barrier
Sideforms for driveways are often built with X to establish Y
2x6 boards to establish elevation and alignment of the driveway. Also used to support he screed to strike off the concrete
Though not required, the addition of X reduces pavement cracking
6x6 wire fabric reinforcing
X should be used where driveway joins the public walk or curb and at the garage slab
expansion joints with asphalt saturated felt strips
How often should expansion joints with asphalt saturated felt strips be used along long drive ways
every 40’
In areas experiencing severe winter climates, driveways should
use air-entraining agent to produce tiny air bubbles that help the concrete resist damage during freeze and thaw cycle.
Concrete sidewalks are constructed just like
concrete driveways
Concrete sidewalks should not be poured over filled areas unless
the fill has settled and is well tamped. This is especially true of areas near the house after basement exvation backfill has been completed
Minimum thickness of concrete for sidewalks over normal undisturbed soil is
4”
Concrete sidewalk control joints should be spaced on
4’ centers.
Control joint:
a joint that helps to minimize random cracks in a concrete slab.
Expansion joint:
gap between concrete that is filled with flexible material. The concrete is able to expand without damaging itself of adjacent surfaces
When the slopes to the house is greater than X%, a walkway should have steps.
5%.
How are individual steps in a walkway with greater than 5% slope formed
with 2x6 lumber
What unit is the needed concrete material specified in
cubic yards
Formula for figuring out how many cu yd of concrete
length in feet x width in feet x thickness in feet / 27 = cubic yards
other formula for figuring out how many cu yd of concrete you needs
length in feet x width in feet / (use the chart to find the dividing number based on thickness of concrete)
A flatwork surface, such as a floor, driveway, or sidewalk, must be
finished
What does Finishing do
multistep process that levels the concrete and gives it a surface that will suit its intended use.
What kind of finish does a basement have
smooth for floors to be attached easily.
What kind of finish does a driveway have
broomed coarse
