P.O 42.5 R/N 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:What is the difference between pallet expanders that can be taken out and others that will be cemented?
Both types expand the palate. The difference is that remove able ones are used to obtain a smaller amount of expansion than a cemented one. The one that is cemented can engage the teeth in a more rigid manner and can be more effective in obtaining extra width. The cemented ones usually work quicker and compliance is not a problem. Compliance relates to the tendency for people who have removable ones to take them out. When they are out they are not expanding. Each case is different. Some require cemented ones and others can get away with removable ones.
Q:applying pavement to soil cement base?
we do soil-cement base with AC or HMA surface all the time. Never use a tack coat. The thinking is have a slip plane between the two sections. Tack coat would allow the subbase to telegraph cracks up into the AC. The key is to have the right soil-cement mix at optimal moisture. Too much water will result in shrinkage cracks. With only 1.5 inch AC that could be a problem. How did you come up with a soil-cement mix design? How much cement? how thick in your section? good luck! Don the engineer
Q:about building blocks made from soil with cement?
You need to have a soil type that has the consistency of sand. Anything dry and grainy... Stay away from clayish substances where the soil tends to stick together because the cement cannot go through them. Usually the ratio I can give for a good building block is about 6 parts of sand, 2 parts cement and 1 part of water (or less depending on the consistency). It should feel like the consistency where it can be easily molded but not soggier than brownies. Use portland cement...
Q:What are the parameters of G class cement?
I did a little looking around on the net. It seems that Class G cement is an oil field cement and is referenced to a American Petroleum Institute (API) classification. I didn't have time to reseach it further, but you may find something at their website
Q:I need to know what cement to use for my shower pan and how to mix it.?
Some fine grain quickcrete will do fine. Follow the directions accurately and you will be fine.
Q:advisable storage method of cement?
I know your friend and she (if I'm correct) is very much missinformed as to storage technique. As much as we both love her, (she's a fine lass) toss the advice. Your little friends need open air! There should be a small hook just under the hairline, on the neck, in the back...Find a comfy spot in the sun and hang 'em...they'll love you more for it.
Q:Surface Bonding Cement mix?
Surface Bonding Cement
Q:Cement was just poured in my backyard and it looks uneven in some places. Any ideas on how to fix this?
There's no such thing as evening out cement once it's cured. It has to be removed and redone. Don't pay the contractor, and have him rip up the whole thing and start from scratch. His mistake... you shouldn't have to pay for it. NOTE: Take digital pictures in case you need to take legal action. A tip: place a newspaper from that day on the ground when taking a picture so that you can prove the date of the pictures.
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:mixture of water and cement?
The problems with cement is that it's a very Thirsty molecule. Could be all the water remains in the concrete. Concrete doesn't harden because it loses it's water - it hardens because of a chemical change (it's hot). Portland cement can harden under water - and the Romans understood this. Some of their bridges are still in use. Then the idea was lost until the end of the 18th century, I think.

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