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: explain: Mortar is used to lay blocks or brick together. It has no stone or gravel in it. Concrete is what sidewalks and floors are made of. It's composition is water, stone and sand (gravel) and cement. So you see, cement is what bonds these other products together to make concrete.

Q: Will they die and just fall over?: They will die but not right away. It might take a year or two, depending on their size and age. And they probably won't just fall over. The leaves would die, then the smaller twigs, then the larger twigs, then smaller branches, then larger, etc. It might take several years for the thing to 'fall over.' We have had a large stump in our side yard for about a decade. The tree died about 15 years ago, but the trunk is still there. 'Course, this was a BIG tree-- the trunk is about 3 feet in diameter.

Q: My aunt found a kitten and she was COVERED in cement. We took some off because it was eating her skin or something like that. But whats a faster way to get if off or loosen it to make it easier...Please help!: You'd probably do best to get some help from a vet. She might have skin irritation she'll need treatment for and her little body is very fragile. If you found her, she needs a check anyway. There's no telling what's happened to her. It's just always a good idea to get a new kitten checked out - especially if she's covered in cement. Poor thing.

Q: So am trying to remodel my bathroom and was wondering if cement board would work better than greenboard as the shower wall? I've read that cement board can be used on floors or kitchen tops but am not sure if I can use it on bathrooms??: Cement board all the way over wall to put tile onto. I ve repaired, tore down and made good money fixing tile that was placed over green board. On a well used shower or tub area the life of green board before it starts to wick in the water and rot is 5/7 years. Not worth the minimal savings to put in green board. The one main key people don t do is to put up a simple vapor barrier behind the cement board and this should be done with green board to. No questions its cement board on walls, floors etc. Any questions you can e mail me through my avatar and check my qualifications there. GL

Q: I made extra cement that I don't want to throw out. I will be using it again in 22hrs, if I can. It got dark out before I could finish my job so my ? Is how to keep it ready for tomm. I'll be at work all day and can't keep adding water to it: There is no way you can extend the life of concrete by 22 hours by adding water. The addition of water to temper, extend the workable life, of concrete significantly reduces the concrete strength. I have no idea how adding water to cement would react but I would guess it would be the same. By the way, cement is the soft stuff and concrete is the hard stuff. Once the initial water is added to a concrete mix it starts to set up. Concrete is said to cure, gain a very high percentage of its strength, in 28 days. A high percentage of the strength is gained between the 3rd and 7th days. Freezing the mix will not only ruin the concrete its ultimate strength would be very close to zero. A effects of a super plasticizer lasts for 30 to 60 minutes depending on the dosage and the concrete mix. After the effects wear off there is a rapid loss in workability. I can not see how this would help you. (That is for concrete super plasticizer I have no idea what a mortar plasticizer would do but I don't think it has ever been tried in a concrete mix.)

Q: I am planning to build a wooden wall in my crawlspace. It is a large, dry space and would be great for storage. The wall would be about 6ft x 32ft and would run along the inside of the cement foundation. Can I attach it to the cement foundation or to the wooden beams running along the top? Or does that cause weakening of the foundation or other problems. If I can't, does anyone know a good way to make the wall sturdy without attaching it to anything (I just want to attach some peg board and shelving to it). Thanks for any advice!: Wood against the cement wall is not a good idea. Moisture from the ground usually seeps in through concrete, and evaporate from the floor. and the wood will soak it up, grow moldy and rot. If you are planning to use it for storage the best course of action would be to encapsulate it instead. That means lining the whole crawl space, floor and walls with a 20mil poly sheet (like a pool liner) specially developed for this purpose, and then install a conditioning system to blow air from the upstairs into the crawl, keeping it dry. Besides protecting your crawl space and stored items from moisture, termites etc... encapsulation makes your whole house at least 18% more energy efficient. It is recommended by the US Department of Energy's Building America as Best Practice. I am adding the link to Advanced Energy website. There you will find videos explaining the process and a ton of studies conducted by them on crawl spaces, as well as to another website about Crawl Spaces.

Q: It is for 3 posts for a small fence/barrier: cement and sand or just cement powder? cement and sand will have the same strength as concrete...gravel is added as an economic filler...

Q: I have an old concrete brick structure with cement floor, with high tin roof all in good shape. I would like to add a restroom in it. How can I securely build a wall? It's my first time trying this type of project, so I was wondering if I have to break up the floor to anchor the wall. Thank you.: if it is an inside wall off the floor.no problem.wall should be double brick or 8thick.

Q: Hi. I can ollie, shovit, pop shovit, powerslide, but can't land a kickflip on cement. I can land on grass like every single time and for some reason, i can all ready varial flip sometimes on the grass too. I don't know y i can't land it on cement. Maybe it's because i always land with both feet in the middle of the board every time i do the kickflip on the grass, so please tell me how i can on the bolts. Also put how i can land it on cement PLEASE!!!!!!!!!!!!!!!!!!!! THNX!!!!!!!!!!!!!!!!: nicely try practising on the cement basically from now on so which you would be able to get used to the action of the cement. additionally basically commit. dissimilar that's ether worry or basically loss of dedication. Grass has no action in it so which you would be able to desire to get used to the rolling action of the cement for a whilst and then shop attempting the kickflip yet dont do it in grass that's going to easily destroy your skill to do it on the cement. you're able to do it interior the grass back once you land it as quickly as on the cement through fact the grass basically quite ruins your skills at touchdown it through fact attempt to be waiting to land with action and circulate. no longer basically touchdown and sticking there.

Q: Wat are the differences in Concrete,Cement,and Moder?: Concrete = Cement + Sand + Gravel + Water Mortar = Cement +Sand + Water Cement = Binding ingredient used to make concrete and mortar.

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