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:White cement accidentally wash clothes how to do, how can we remove, thank you
Mixed with cement or cement? Cleaning method is different White cement will be able to play a lot of go down, and then washed very easy Mixed with the sand of the cement can also be dry and then let go of the surface of the floating sand, after cleaning The most troublesome is the ordinary cement, in the semi-dry do not dry things off the surface, and then completely dry hand rubbing clothes, the cloth gap in the cement rubbing and then wash But the black is too much trouble, it is possible that the cement has eaten the color, then only hard wash
Q:My question to those who are working in cement industry?
There are two possible options. First you need to maximize the strength potential of the cement clinker you are blending with the natural pozzolan to make the pozzolanic cement. This means stabilizing the clinker mineralogy and boosting the alite content. You can do that by lifting LSF or SM dependent on your current clinker chemistry. Another alternative would be to add calcium fluoride to the raw mix. Secondly you could add a cement conditioner to activate the pozzolanic reaction in the cement. Possibly alkali carbonates or potassium sulphate.
Q:What is the difference between concrete an cement?
Concrete is a composed of rocks, cement and water. Cement is a type of stone (originally from the Portland Quarry) that is heated to around 1400 degrees and then ground to a powder with gypsum and calcium silicate.
Q:What is the use of using oxygen in cement industry?
The ingrediants for the cement need to be heated to a very high temperature to make Portland cement. Usually methane with air is the heat source, but oxygen replacing some of the air is sometimes needed to reach the optimum temperature. Possibly a superior cement is produced if it has negligible nitrogen, argon and carbon dioxide, so oxygen is used instead of air which contains nitrogen, argon and carbon dioxide as well as oxygen.
Q:is it illegal to write in wet cement?
If it is I guess I've been breaking the law for forty years. And my dog Petunia too! I really don't know, I just know I've never been caught by anyone who can arrest me for it.
Q:cement slabs and houses?
Some thoughts to consider: First, If you live in a climate that gets any kind of cold weather the slab will feel cool or even cold to the touch. The solution to this is to put in a hydronic in-slab heat. Even if you don't put the hydronic heat in, do put rigid foam insulation under the slab, it WILL save money on heating costs (unless you live in a tropical climate). Second, if you do put tile on the slab, be sure to use a membrane between the tile and the slab. It will add a little cost, but if you don't, any cracks in the concrete will just come through and crack your tile (and you know what they say about concrete, there's two kinds, concrete that's cracked and concrete that's going to crack). Third, DO NOT let anyone talk you into putting forced air ducts under the slab unless they use the blue plastic HK duct. The HK seals completely. If they use the old PVC style duct under the slab you WILL get mold in the ductwork. Slab homes can be fine, if they're built right. They will last just as long as a home with a basement or crawlspace.
Q:Can you use rubber cement glue on a car tire?
Take it to a tire shop to be sure.
Q:Too much water in cement?
maybe. at best you will probably have a solid concrete layer with a layer of water over it. the concrete will not be smooth. you may be able to sop up the excess water and smooth the concrete before it cures.
Q:Temporary cement for my permanent crown?
I've never heard of anything like this, especially when inserting a permanent crown for an implant. Your dentist seems a little unsure of what he's doing. I mean, if you always anticipate your work to have problems in the fututre and for anything to happen then things will definitely happen when in reality they shouldn't. An implant that is done right should last your whole life, A crown that is done right (and assuming to take very good care of your teeth) should last 10-20 years (although I've seen some crowns last 50 years). I personally find it a little odd that he cemented a permanent crown with temporary cement.
Q:What dissolves clumping cat litter on cement?
it is made of clay. about nothing will dissolve it. scrape it off with a shovel

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