PORTLAND CEMENT P.O 42.5

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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

Q: I am putting tile on the wall in my bathroom (not in the shower), do i have to put cement board behind it?or can i just leave the drywall that is already there?: I would highly recommend doing it right and using cement board. Try to avoid using any type of plywood for a substrate to attach the tile too. Ceramic tiles can be installed directly on drywall, plaster, or if they are in moist areas, onto green drywall or even better cement backer board. Cement backer board is actually made from a fiberglass mesh and Portland cement, so moisture won't bother it at all. It is available in 1/2 and 5/8-inch thick sheets (similar to drywall), and is usually sold in 32 or 36-inch wide panels 5 or 8 feet long. for other information check my source site

Q: hi, I was wondering if anyone could suggest an adhesive more permanent than rubber cement. I am making a package and wanted to glue something onto the package for a friend. also, is there a difference in the level of adhesive-ness between rubber and paper cement? also, what's the difference between the one coat and two coat rubber cement?thanks in advanced,craftgoth420: I like Goop or wood glue. I think the 2-coat rubber cement may be the same as contact glue.

Q: Final setting time of cement...?: First is the 1st 24 hrs which then you can walk on the slab. 2nd is the next 7/8 days after which you could drive across and the final setting time is the next 30 days for the slab to cure. GL

Q: I have tile borders that have been used as a design form between 2 set of tiles unfortunately the person performing the tiling bit has applied direct cement onto it and has caused it to harden and set. Now the cement is hard to scrape off since the border has designs grooved on it and is also covered with grout colour. Can anyone please help me out and tell me how to remove grout colour and cement from it.: Warm water with white vinegar in it, the vinegar disolves the cement, use a light scourer as well to apply and scrub off

Q: What is the value-added tax rate of sand, soil and stone?: The value-added tax rate for sand, soil and stone used for building and production of building materials is 6%

Q: who can tell me a world cement website?: If okorder they are the biggest cement manufacture in the would,you can search for information there.

Q: I had the foundation repaired in my basement a while back and the dust from the cement is still there, I've washed the floor about 5 times since and it still hasn't come off, got any suggestions about what I should do?: You should flush the roof and all side walls.

Q: I want to re-do the tile that surrounds my tub walls because the old tile has water damage and rotted. I was wondering which type of tile cement backer board is better ? hardiebacker cement board or durock cement board ? and should I install a vapor barrier between the studs and backer board... I seem to get mixed opinions on that ?: Oh, installing a vapor barrier behind the cement board is absolutely necessary. Tile with grout isn't waterproof at all, and you want to keep that moisture out of the wall. Some people even go beyond asphalt paper and insist on using a nail-hole sealing material like bituthane because they are that concerned about the moisture making its way through. Durock is better for walls that will be under constant barrage from water like a shower because it acts more like the troweled-on mortar a professional tile guy would use. Being more purely cement, it will be less likely to expand and contract than the hardi-backer, which contains more fiber.

Q: Portland cement: Do you mean concrete, that holds things together or for roads and bridges? It can be confusing because many call concrete cement. Concrete that is being mixed in the drum truck is made of cement (a dust), rock, sand, water, air. For some projects they will add flyash or other lighter weight additives and lower the actual amount of cement included.

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