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: What is the meaning of 53 grade cement ?: The grade of a portland cement corresponds to how much pressure it can take after it has set for 28 days. 53-grade cement must have a compressive strength of 53 MegaPascals (7687 pounds per square inch) after 28 days. There are also 33 and 43 grades, which must have minimum compressive strengths of 33 and 43 MPa respectively.

Q: What is the ratio of cement to sand to make concrete?: It's been a while, but I think it's 3 sand, and one cement

Q: Hello, I have a paper stencil that I want to use to paint on a design on a block of wood that have that's painted with acrylic paints. If I glue down small portions, when I peel it off, will the paint me ruined? Would Elmer's school glue work better?: You will want to use an oil-based paint if it is going to be outside. If it will be inside, then you can use either latex or acrylic. Acrylic will last longer, though. So, I think you are on the right track.

Q: I just got a house built in the 1950's. I had a new washer/dryer installed and set up in the basement. When I ran the washer last night everything was running fine but when I looked in my backyard there was a lot of water gushing out of some kind of cement square in my patio in the backyard. It seems like this cement square can be lifted but I couldn't lift it to see what's going on in there. Any ideas?: Could be1 or 2 things 1 - your leech lines are backed up from your tank. Do you have trees in the area? Or has someone been driving heavy equipment over your lines and crushing them 2 - The first owner and home builder didn't want all that extra water going into tank when its not needed. I have my system set up so bath and clothes water runs out over roads not into my tank.

Q: I am taking a chemistry course and i am wondering what purpose quot;PVC Resinquot; serves and how it achieves that purpose?: How Does Pvc Glue Work

Q: ok im building on big open stall for my 2 horses but part of the barn where the stall will be has cement under the dirt so we cant put any posts down anyone have any idea's of how i can get this to work? there is only about 5 inches of dirt on top of the cement. so what can i do?: Google Metpost, this is a metal frame that the post sits in and is bolted to the cement. I'm afriad it's a british thing but I'm sure they'll have the same kind of thing where you are and at least you have a pic of what you need. hope this helps

Q: I need a 20 ft by 16 ft concrete pad for a pavilion. Should I use a concrete truck or quikrete? Costs are a factor.: You need more than cement for a 16 x 20 pad. You need forms, iron and a lot of muscle to poor and smooth the pad. Mixing that much cement yourself will require the rental of a cement mixer(way too much to do by hand). Bette do some research before you get started.

Q: How is cement made out of?: You will find that they are not the same. Cement is the glue that holds the stones/sand together to make concrete.

Q: I would like to ask where there is cement to sell themselves: Add quantitative water and material to fully stir, to ensure the formation of uniform consistency, no caking flow of the slurry, and check the slurry flow performance The mixture will be mixed on the base of the base, with a scraper flattened, a smear to achieve the required thickness, and use the gas drum to roll back and forth to release the air contained in the slurry, after the completion of You can wait for its self Create a building materials to do cement self-leveling material (can package workers package material), we are serious Thank you

Q: I know they grab onto wood and trellis' but, do they need some kind of support to cover a cement wall?: They wll grow with little support. I have seen them climb the side of a stucco house

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