PORTLAND CEMENT P.O 42.5

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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:Problems with cement?
A bit vague, but in general no cement should start to deteriorate so quickly. Was the reinforcement rusty? That will cause spalling (bursting of the concrete) Also a bad mix or improper curing (curing can be immensely important in some applications). There are also any number of chemicals which will deteriorate concrete and many of them are found right there in the ground, but this should take years to occur. If this came out of a Lafarge truck, there is always the possibility that you got a mix intended for someone else (this happens more often than many realize) There really is no excuse for cement to fail so quickly, if this was a pro job I'd have them back ASAP. If it was a personal job, check your delivery docket and if all is well, call the batch plant and get one of the concrete guys out there to take a look. It's rare, but sometimes you just get a bad batch.
Q:What's the difference between cement and concrete?
In addition to the excellent answer from hamrrfan, I would add that concrete is typically much stronger than cement due to the addition of the aggregate.
Q:Is dry cement powder dangerous.?
Yes. My son worked at a job that required handling of dry cement for about 2 years. He ended up having some sinus cavities reemed out due to the inhalation of the dry cement dust.
Q:How long does it take cement to dry?
First of all it is concrete not cement and second of all it doesn't dry, it cures. It is a chemical reaction, it does not just simply dry out like mud brick. Given that, there are too many variables to take into account, thickness, environmental conditions, the exact formula of the concrete mix, etc.
Q:Could you survive submerged up to shoulders in wet cement?
well neither actually, but it would be unpleasant and you'd probably still die, being buried to your shoulders in wet sand would have the same effect... each time you exhaled and your chest depressed the cement would take up the space, as it slowly dried the space you were in would become smaller and smaller and by the time it dried the space you were in would be so tight you wouldn't have room for your chest to expand when inhaling and you would suffocate. I guess you could survive if you kept your hands in front of you to keep room open for your chest expansions.
Q:How long does it take cement to eat wood?
If you sloped the cement away from pole to let water run off ,your grandchildren will see them out, in other words, a bloody long time. I found that after a week the cement seems to shrink slightly around the top ,you squeeze silicone sealer between cement and timber, cause water will rot the pole before cement, but still a bloody long time.....So sit down with a coldie and enjoy your new fence or whatever without a worry.
Q:NEW exercise: Let the body hit the cement WALL!?
There are disadvantages and advantages of that the disadvantage is that your body might be awchy the advantage is that it will get hard
Q:ingredients of cement?
The most common cements are made by heating limestone with clay, then ground with gypsum into powder.
Q:DIY Fencing question... cementing in T-posts?
You dont to use cement. Drive them down about 3 feet. Some folks cement them in but it does little to the strength and then it would be really difficult to remove the post. Which is really what is so great about 5 post.
Q:Will rubber cement work on painted aluminium?
Nope. Contact cement would be better. But I don't think anything will last long out of doors. Even the paper will start to fall apart after the first rain or heavy dew. And the sun will also cause it to decompose. Paper does not do well outside. You may have to rethink your project.

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