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 have some cement cracks and i was wondering how to fix it. any sugsetions?: YOU CAN BUY CEMENT CRACK FILLER IN A BOTTLE AT HOME DEPOT OR LOWE'S OR AT YOU LOCAL HARDWARE STORE IT'S MADE BY QUIKCRETE

Q:i want to practice track on the streets and i want to break in track shoes with spikes: Well, you could but I wouldn't recommend it because it will wear down the spikes faster and you might slip. So if I were you I'd practice on grass, not cement.

Q:I was washing paint brushes in a bucket with water the bucket turned to mostley paint and then the bucket fell on my pation floor which is cement now it wont come off!!!!!!: Why not just GO FOR IT and paint the rest of the floor?

Q:I know they say babies don't keep a man but it is a lifelong commitment so why not?weather the relationship is good or bad I truly do believe a baby is a way to cement that man into your life?Why do I feel like this?: why dont you have the baby as your romantic relationship.

Q:i'm replacing the old wall in my tub with hardibacker. can i screw it on the tub lip? coz the instructions said that it should be screwed or nailed 3/8quot; from the eges.: The edge requirement is just so that you hit deadwood on the outside to keep it from flexing. So that the tile won't come loose later on. just screw it close to the bottom on the stud.

Q:I'm looking for a good glue for paper to glass. Contact cement or any suggestions?: Clear Contact Cement

Q:Let's see if I can get the right. I have 12 cement columns which are three meters high (on third floor) and I want to put wooden columns on top of them 3 meters high. (fourth floor) The trusses will be on top of the wooden column. I'm concerned about how to connect the wooden columns to the cement columns so that they are stable and secure?: Are you sure they are cement and not fiberglass? Are they solid or hollow? You should maybe run the fourth floor joist out to the columns and put down some subfloor or decking material before adding the new columns. What are the diamiter of the 3rd floor columns? You need to determan the load bearing max on them. If they are fiberglass and 10 they should have a max load of around 10 thousand pounds per column. This should be ok. How far apart are the columns? This will also play into the wieght and how evenly it is distributed. Also check the load max on the new wood columns they will hold much less than the fiberglass.

Q:I want use cement board 1/2quot; under my toilet and then use carpet to put over that. Is that a good idea? What are my options?: Cement board is fine but carpet? Carpet in a bathroom? Carpet is about the worst thing you could use in a bathroom. I would even rather have a wood floor in a bathroom than a carpet. The best flooring in a bathroom would be either linoleum or tiles of various materials. Solid surfaces are best for areas that get wet as long as they are protected properly.

Q:Why does cement hardens when exposed with air and water?: Cement does not need to be exposed to air to harden. It can cure under water! This is why it's called hydraulic cement. Curing is one of the most important steps in concrete construction, because proper curing greatly increases concrete strength and durability. Concrete hardens as a result of hydration: the chemical reaction between cement and water. However, hydration occurs only if water is available and if the concrete's temperature stays within a suitable range. During the curing period-from five to seven days after placement for conventional concrete-the concrete surface needs to be kept moist to permit the hydration process. new concrete can be wet with soaking hoses, sprinklers or covered with wet burlap, or can be coated with commercially available curing compounds, which seal in moisture.

Q:ive been waterproofing basements for 13 years. we jackhammer concret all day and the basements get very dusty. masks are worn but their not 100%: i like tiny's answer... though, i don't do that stuff... concrete is very bad for you. not QUITE as bad as asbestos, but damned close to it. you can get emphysema, lung cancer, CONCRETE OPHTHALMIA etc etc from prolonged exposure, just like you can get concrete poisoning from laying wet concrete and not washing it off of you. i'd find a new line of work and do something to clean out your lungs.. i hope you aren't a smoker on top of that. as far as masks go, that obviously helps, but it depends on the quality of the mask obviously. I would assume you know the difference -most likely better than i would.

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