is the difference between Cement and Concrete?
was a building material of both the Greeks and the Romans,
but when Rome fell the widespread use of cement was lost
for hundreds of years. Then in the 1700's Joseph Aspdin,
a British citizen, discovered that if he added clay to limestone
then superheated it, the resulting mixture would set anywhere,
even under water. He patented what he called Portland cement,
which is still the cement in use today. Dams, oilrigs, dock
supports, bridges, lighthouses and various other structures
are made with Portland cement.
is a masonry material that uses cement to bind together
crushed stone, rock and sand. Cement makes up about 10%
- 15% of the total mass of concrete. Although concrete is
very strong, it requires reinforcement if used as a building
material because of its poor tensile strength, or ability
to withstand the horizontal forces or sway buildings must
endure from wind or earthquakes. In short, concrete doesn't
stretch or extend very well in reaction to cross-tensions.
can be reinforced by pouring it over long steel rods , called
rebar or adding fibers to the mix then letting it set. Concrete
sets faster or slower according to how much gypsum is added
to the mixture. Therefore if a contractor schedules concrete
to be placed (poured) at a certain time, make sure you are
available and there is nothing blocking the area where the
concrete truck needs to access and deliver the concrete.
The set time of concrete can be accelerated by adding calcium
chloride, or can be slowed down by adding retarder. These
compounds affect the development of the hardening crystals
that form as concrete sets.
to the high content of rock, concrete is extremely durable,
attractive and is often used around pool areas, for sidewalks,
driveways, roads, and of course skyscrapers among many other
uses like subways, silos and lamp posts. The ingredients
in both cement and concrete are among the most abundant
on earth, and neither contains byproducts. Both extend renewable
resources due to long life, and can be recycled to make
future cement or concrete.
uses recycled concrete, in all of their concrete project
as a base. We do this in order to achieve a highly compacted
base, weather it's for your patio, driveway, or garage floor
it will be compacted, to reduce shifting later. Concrete
also comes in different strengths, or P.S.I, depending on
what your project is. Concrete is also different depending
on if it is to be poured inside a structure, or outside
the structure. For example your exterior concrete will have
an admixture of air, this helps with the severe weather
changes that occur in our climate.
if my Concrete has rust stains?
stains can become visible on Concrete and can originate
from many sources. Rust may be caused from the aggregate
used, as it may contain iron oxide, or from rebar being
placed too close to the surface. Often times a homeowner
believes the rust appears due to problems with the installation
or the concrete mixture. This is not the case. If your concrete
has rust stains, use these helpful tips and suggestions
for removing unsightly rust stains from concrete surfaces
such as foundations, patios, sidewalks, driveways, and porches.
stains on concrete are all too common for those having well
water. It is near impossible to prevent rust build-up on
concrete foundations, driveways, porches, patios, and sidewalks.
When watering plants and bushes, the rust builds up over
time, and leaves behind unsightly orange marks. These marks
can turn a beautiful home into an eyesore.
water is the source of the problem, when watering bushes
and plants around the foundation and other concrete areas
of your home, use a spray nozzle that allows for better
control. Although it isn't easy, make every effort to avoid
spraying concrete with well water that contains high levels
stains can also occur on patios, sidewalks, and porches
when metal furniture begins to rust. These marks often go
unnoticed until furniture is moved. Maintaining a coat of
paint on old metal furniture can prevent this problem.
If your metal furniture has begun peeling and rusting, remove
as much of the old paint as possible using a wire brush.
When refinishing the furniture, apply top-quality metal
primer as the base coat, and follow label directions on
rust-preventative paint for the topcoat. Not only will your
metal furniture look brand new, but also there won't be
any future rust stains to worry about.
existing rust stains from concrete there are several methods
to try. Lemon juice, which contains acid, is a natural remedy
for removing rust stains from concrete and other hard surfaces.
Pour or squeeze undiluted lemon juice on rust stains, and
let it sit for several minutes. If the stains are on the
side of a concrete foundation, put lemon juice in a spray
bottle, and spray the rust-covered surface. Use a sturdy
bristle brush to scrub the area, and then rinse the lemon
juice away along with the stain.
natural solution for rust removal is ordinary household
vinegar. Apple cider vinegar and white vinegar both contain
acid. Use either one to aid in the removal of unsightly
rust stains. Either pour or spray undiluted vinegar on the
stains, and allow it to set for several minutes. Scrub the
area with a sturdy bristle brush, and rinse the vinegar
and stains away.
vinegar and lemon juice can kill or damage foliage. Use
caution when using these products around plants and bushes.
After using these products for rust removal, be sure to
rinse the area thoroughly with a hose. The vinegar or lemon
juice will be diluted, and it should not cause any damage
to surrounding bushes or plants.
rust problem is a difficult one, you should try using a
commercial rust remover containing oxalic acid. It usually
comes in powder form, and it is toxic. Follow label directions,
and exercise caution when using it around children, pets,
stains on concrete foundations are caused by exposed metal
rebar that has rusted. Rebar is the metal rod that reinforces
poured concrete foundations. Many times portions of these
metal rods are exposed. When these rods rust, they also
become weak. Over time, the rust becomes an eyesore, and
the weakening metal rods become a hazard to your foundation.
After removing stains on your foundation that are caused
by rusted rebar, you should seal the concrete to prevent
any further rust or damage. Concrete sealer is available
in most home improvement stores, and it is well worth the
cost and time involved in application.
on concrete surfaces is a problem for many, but it doesn't
have to be a permanent one. Use these solutions and methods
to remove and prevent rust, and your concrete will look
like it did when it was new.
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