Grey Ordinary Portland Cement 42.5r n grade

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Product Description:

Specification of Cement

No


Detail


result

I

Chemical test

1

Loss on Ignition

%

2.0 ÷ 4.0

2

Insoluble Residue

%

0.3 ÷ 2.5

3

SiO2

%

19.0 ÷ 22.0

4

Al2O3

%

4.0 ÷ 6.0

5

Fe2O3

%

2.5 ÷ 3.5

6

CaO

%

61.0 ÷ 67.0

7

MgO

%

1.0÷ 4.0

8

SO3

%

1.6÷ 2.2

9

Free lime

%

0.3 ÷ 1.5

10

Toltal alkali, (Max)

%

0.75

11

(C3S + C2S), (Min)

%

54.0

12

C3A, (Max)

%

2.5 ÷ 3.5

14

C4AF, (Max)

%

7 ÷ 11

15

False Set, (Min)

%

50

16

Chloride, (Min)

%

0.1

II

Physiscal test

9 ÷ 11

1

Fineness Blaine, ( Min)

cm2/g

3400

2

Soundness: Lecateller test, ( Max)

mm

5

3

Air content or mortar

%

5 ÷ 10

4

Autoclave Expansion

0.03 ¸ 0.20

5

Setting time, (Vicat test)

Initial,

Final,

min

110 ¸ 160

200 ÷ 300

6

Compressive Strength

3 days, (Min)

7 days, (Min)

28 days, (Min)

psi

2320

3480

5220



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Q:Cement silo opening clogged?
Under the silo there is usually a butterfly valve with a screw conveyor below it.Never let the dislodged filter element gets into the screw conveyor ! It will cause more problems. You need to drop your conveyor ( at the motor end / below the silo ), if your butterfly valve is not jammed, slowly and partially open the valve to retrieve the filter element. you will bound to loss some cement anyway. However, IF the cement at the bottom of your silo is hardened.. then you might consider oxy-cutting a small opening to try your luck and at the same time, break / remove those hardened cement. Good Luck! Try Your Best To Avoid Environment Pollution and Look After Safety of people working on the silo too :)
Q:cement slabs and houses?
We've lived in a home w/cement slab for 22 yrs. and had no problems. People ask if it ever cracked and the answer is no. We also have ceramic tile over the slab and no problem. Love it! Neither of us grew up w/ a basement so we don't miss it. Negative - possibly not having a place to go in hurricane events or extreme weather but that's what an inside closet is for.
Q:Is there a waterproof sticker that can be attached to a concrete wall?
2m * 24m, behind the universal glue, or just take a nail nail directly This is the board has a variety of colors If it is gray wall, the ash shovel out, the concrete wall brush on the base film, in the back of the panel and the wall brush on the universal glue, directly to the cement wall sticky Corner and the same color as the panel angle
Q:what is the difference between (concrete) and (cement)?
The difference between concrete and cement is that concrete contains cement plus sand and gravel. It is the cement that binds the sand and gravel or crushed rock together to form what we call concrete. Concrete then, is more than just cement. Cement is made from limestone, calcium, silicon, iron and aluminum, plus lesser amounts of other ingredients. When water is added to cement, a chemical process occurs as it hydrates, allowing it to harden.
Q:How can I mount my tv onto a cement wall?
You would use Tapcons, or metal expansion sleeves, to attach the mount to the wall..
Q:How do I set a picture in cement or Plaster of Paris?
Let's see... I think plaster might be too fragile. You know, you can mix equal parts of plaster and cement. It'll set quick enough, and be strong enough. Because, cement can take days to set properly. With the mix, half an hour, tops. The picture alone will probably get ruined, like putting paper in water. I'd keep it in a frame, or glue it in later. I'd leave a space in the stepping stone so when I put the picture in, it'd lie flat, not on top of the stone. Inset. Then I'd cover it with plexi-glass. A lot of hardware or craft stores will sell little sheets. In fact, maybe I'd just make the stepping stone into one large picture frame. I'd use something of equal size and make sure that I used a lot of release (wax, soap, grease) and some pieces of wood to make a mold, where you'll pour in the mix. Make sure you coat anything (table, boards of wood) in release that you don't want stuck to the mix. Then it's just a bit of thinking and testing to find what will work.
Q:what is the diffrence between cemented carbide and high speed steel cutting tools?
Generally, cemented carbide is harder than high speed steel. To last the longest and provide the best cuts It also requires different rake angles relative to the material being cut. A negative rake angle is better with cemented carbide cutting tools and a positive rake angle is better for high speed cutting tools. The material being machined is also a factor in the best rake angle.
Q:how to set up a cement slab?
with wood stakes and nails a level or laser string line sledge hammer. Need more info to help
Q:is cement harmless to breath in?
no cement is very bad to inhale and so is most everything . when demolishing a home. a simple face mask is best to put on or use a tee-shirt over the nose and mouth will do. good luck
Q:is cement bad for your skin or breathing it?
It is bad to smell but no unless you dealing with cement or pavement all the time, it isn't anything to worry about.

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