42.5 R/N Grey Ordinary Portland Cement

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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:Clogging Shoes on cement?
It's notttttt the best idea it can slowly ruin your shoes!
Q:Too much water in cement?
Yes it will dry up just trowel it as smooth as you can and let it set up over night
Q:Why does cement curl when you cut it with a saw sometimes?
heat genorated from the saw blade and the fact that the blade is spinning in an upward rotation has something to do with it.
Q:Why is my lawn dying next to my cement walkway?
Variety of grass you have in your lawn can be of much help to determine the cause of your problem. Cement composition(depending on your cement) will change the pH in your lawn soil, knowing what type of grass you have would be helpful. On the other hand it can be a chinch bug problems(in my case I've Saint Augustine grass and have the same problem) the cement walkway exsert heat and chinch bugs love this. Chinch bugs also effect grasses like aszoysia, Bermuda, and centipede grass. When you said dying, what color was the grass, brown, yellow?. Is it only next to the cement or further into the lawn(center) as well. If the grass is brown next to the cement I treat it with an insecticide for chinch bugs, this will treat the problem. I've used talstar liquid concentrate with the best results(I recommend this product), it also comes in granules for larger areas too. This product is easily found at Wal-Mart, OKorder, etc.
Q:Barefoot in wet cement?
Not a problem -- I did this a couple of times when I was a kid and there were zero complications at all.
Q:What is cement made of?
Cement is made by baking/firing gypsum rock to drive off the chemically bound water. I live in Dallas and we have millions of tonnes of it just below the topsoil which can be seen in road cuts and in names like White Rock Lake.
Q:cement show me how to calculate?
people always confuse cement with concrete. The concrete volume has been described already, but the quantity of cement per cubic yard averages 5 to 6 sacks of cements per cubic yard. A sack of cement weighs 94 lbs, so you are looking at 470 to 564 lbs of cement per cubic yard of concrete.
Q:looking for information on cementing post for a field fence and gates.?
Cement is good, but we like to use crushed stone on all our fences that we install (if it is wood). Reason being, the crushed stone allows the water to drain away from the wood and you get less rot over the course of time than you would with cement. Also, once you set the post in cement, it is a royal pain to remove/adjust. Not to mention the ease of having buckets of crushed stone instead of having to mix cement and all the hastle which goes along with that. just a thought
Q:Is it possible to add certain materials to the cement in order to be valid in the work of mosaic.?
(A)For outdoor work the ideal adhesive to use is cement based. Either a cement based tile adhesive or a sand and cement mix. Of course the tile adhesive MUST be both water-proof and frost-proof. Cement base adhesives can be bought in bags from 2kg up to 22kg. They must be mixed to a firm consistency and applied to a dry surface. Your mosaic tiles are then pressed into the mortar to give a good contact. Work with a small amount at a time as you will normally have about 20 minutes working times with each batch. To help improve the flexibility and adhesive properties of the mortar add a plasticizer or polymer additive to the mix one part additive to two parts water. This is the preferred mix if you are making a mosaic for a predominantly wet location. Add this to the cement until the required consistency is reach. If using sand and cement mix use the ratio 3 or 4 parts fine sand to 1 part Portland cement. Mix thoroughly and add water. Mix to the required consistency. It is advisable to wear gloves whenever you are dealing with cement based products. To improve the adhesive and strength properties of the mortar, the setting time should ideally be long and slow. So if you can cover each days work with a polythene sheet to protect the work and help the setting.
Q:Cement Floors?
our house had the most ugliest floors in the world so we ripped up the carpet and had cement floors. well i personly think that if yoor going to get floors DON'T rip up the carpet, i really think that you would hate it, i did.

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