P.O 42.5 R/N CEMENT

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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: It's for my Science hw....: Cement is not poisonous (since it is made from burnt stone) but I have never heard of anyone tempted to eat it. It is definitely not flammable (and is used for fireproofing over steel beams). If there is a great cloud of cement dust in the air in an area that has a source of ignition that dust could explode (not very common and only applies to the dust.) It is mildly corrosive when wet before it cures (only a problem during first few days after pouring it).

Q: and it was lumpy can i still use it or will the lumps interfer with the leveling process, ( and how liquidy should i make it) i experimented with a little amount and it just didn't look right so i threw it out.. it's the firt time i'm using a self leveling product: Never NEVER try to work with lumpy cement. Toss it and start over. Mix well make sure you enough but not too mcuh water. Cement of any type needs to be smooth and easily spread.

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: We're gettin better man! :)

Q: Egypt cement price ?: Price varies everyday, this week the price per ton is L.E450 in upper Egypt and L.E430 in the rest of the country. This the price for packaged cement. The government has been cracking down on the cement companies, forcing them to decrease their prices due to price fixing manipulation by some of them, expect prices to slightly drop in the future. As for export price, it has been stable at around $100 for some time and I do not expect it will change in the near future.

Q: Explain why. Don't just give a yes or no answer. Full details: because aliens dont wear hats.

Q: I need to find the properties and additives of a cement produced by a cement producer on their web page or from a catalog. This needs to come from an on-line source. Any ideas? Thanks!: Portland Cement Cement Composition. The composition of portland cements is what distinguishes one type of cement from another. ASTM C 150 and AASHTO M 85 present the standard chemical requirements for each type. The phase compositions in portland cement are denoted by ASTM as tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), and tetracalcium aluminoferrite (C4AF). However, it should be noted that these compositions would occur at a phase equilibrium of all components in the mix and do not reflect effects of burn temperatures, quenching, oxygen availability, and other real-world kiln conditions. The actual components are often complex chemical crystalline and amorphous structures, denoted by cement chemists as elite (C3S), belite (C2S), and various forms of aluminates.

Q: We have an odd shaped living room and the way we have it arranged our couch is sitting in front of the woodstove. It has not been a problem since it has been warm out and we have not been using the stove, but now that fall weather is here we are getting to the point that we are going to have to use it. Our couch sits about 2 feet in front of the stove with the back of the couch facing the stove, its enough room for a person to walk between the couch and stove without touching the stove. I need to know if we can attach a piece of cement board that has ceramic tile on it to the back of our couch to make it safe from getting too hot and causing a fire. Thanks.: To answer your question, yes, it would be okay to install a cement particle board to the back of your sofa, to provide a barrier between the stove and the sofa. If you choose to go with this option, purchase the ones with higher fire resistance and install the wall backing from the bottom of the couch, to a height high enough to protect people's heads. But. if there is enough space, it would be better to move the couch further from the stove instead. In fact, if you can move some stuff around, it would be much better to shape your furniture like a U, with the open end facing the stove. Just as you would fix it around a fireplace. Because it isn't just the couch you need to protect, it is also the people sitting on it. Flying embers could scorch hair and clothing as well. And if you have small kids, regardless of what you tell them, they will once in a while forget and will pass through the space between the stove and the couch. With a U-shape, there is a better chance that they will pass between furniture, as opposed to between furniture and stove.

Q: please tell me which of them is toughest?And I would like to get to know some recipes for both of them in order to use them in my yard: Concrete is stronger. Cement is mostly used to make mortar using water,cement, sand. Where as Concrete has gravel in it to give it more support. Concrete is sometimes used when laying block. The concrete and rebar help to support the wall