Grade 42.5 R/N P.O CMENT

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I. CEMENT STANDARD

1.Vietnam standard (TCVN)

- Quality of Cement as per TCVN 6260 - 2009

2.European standard (EN)

- Certificate I -EN 197-1.2000- CEM II 42,5 R

- Certificate II - En 197-1.2000 CEM II 42,5N

- Certificate III - EN 197-1.2000 CEM I 42,5R

3.American standard (ASTM)

- ASTM C150 TYPE-1

- ASTM C1157 TYPE- GU

- ASTM C1157 TYPE- HE

II. SPECIFICATIONS FOR ORIDINARY PORTLAND CEMENT AS PER EN 197-1:2000/CEM II 42.5

Items	Units	Specification	Test Results	Test Method
SiO2	%	≤ 26.00	23.41	EN 196-2
Al2O3	%	≤ 6.50	5.50
Fe2O3	%	≤ 4.50	3.60
CaO	%	≥ 54.00	57.00
MgO	%	≤ 5.00	2.75
SO3	%	≤ 3.5	2.56
Loss on Ignition, (LOI)	%	≤ 10.00	7.00
Insoluble Residue	%	≤ 12	6.00
Physical and Mechanical Properties
Finess test				EN 196-6
- Blaine	cm2/g	≥ 3200	3800
- Retained content on sieve 75mm	%	< 15.0	0.10
Time of setting - Initial set - Final set	Minutes	≥ 75 < 420	145 200	EN 196-3
Soundness (LeChatelier)	mm	< 10.0	1.0	EN 196-3
Compressive strength	MPa			EN 196-1
2 Days		≥ 20.0	23.0
3 Days		-	27.0
7 Days		-	37.0
28 Days		≥ 42.5	50.0

Q: How to identify the quality of cement and sand in home improvement?: A * A * A = A3 A: It is considered A3cm3 (dm3.m3). 3 to 1 stirring this how to say that you are used to grinding the floor, or Fenqiang, or why? The

Q: I know that it is the ordinary cement.Then why it is written on the brand name as port land.What this name means: It's Portland Cement, and you can read about where it got its name here…

Q: While chewing gum, my molar crown fell off. I was panicking and i used my tongue to place it back. I got home and i have some temporary teeth cement I was going to use, but I tried to very gently pull the crown back out and it won't come out. Should I use a little more force or should I just keep it as is? It's Sat night and my dentist isn't available until Monday. I'm afraid to eat or sleep: Are you a dentist? If not, don't attempt to replace the crown - especially with temporary teeth cement. The very fact that the underlying surface has now been exposed to germs means that putting cement or anything else on to the area opens the tooth and the surrounding gum to infection. You'll have to wait to see your dentist on Monday. I note that I lost a crown and had to wait several days because I was overseas and couldn't locate a dentist. What I did was to wash my mouth with an antiseptic mouth wash several times a day. I found a dentist as soon as I could who cleaned the area thoroughly. My own dentist replaced the tooth. I no longer chew chewing gum. The practice is a recipe for disaster for those of us with crowns on our teeth.

Q: no cement in particular, just a quick setting one. And with the cement you also drink water so that there is enough liquid in your stomach to make cement.: If you ate cement mix, I think there would be more wrong with you than we could possibly deal with on Y!A

Q: So......I'm a little over my head here. Started taking down wallpaper and wouldn't you know it, there was layer, upon layer and then I accidentially started taking up the backing and came to cement. Have done what I could to salvage what I did, but have decided I'm going to use textured wallpaper over the existing. Do you think it'd be alright to paper right over and on the cement?: concrete or cement is a porous surface and will not let the glue stick for the long haul. you need to paint the surface with a sealer before you began. a good sealer to use is dryloc. you can pick it up in any paint store or hardware store.

Q: Ones cement concrete is set and solid, it is as hard as rock? How it happens?Are pebles or cource sand in it helps? Or is it cement powder that becomes hard?: the cement powder is what gets hard. it is a chemical reaction where the point is to make the stone into a pourable item, then as it dries it turns back in to stone. the pebbles and sand are present to reduce cost and to help with expansion and cracking problems.

Q: my maryland bridge fell out yesterday. the dentist wont be open till monday. its one of my front teeth. is there something i can use to temporarily cement it back in with.: Unfortunately, there are no temporary cements that will hold a Maryland bridge in place. You will have to see a dentist to have it re-cemented. There is a protocol that needs to be followed for cementation of a Maryland bridge and only your dentist has the proper products that are needed to bond the bridge back into place. If you call the office and explain your situation to the answering service or call the number left for emergency patients--the doctor will get the message and will usually meet you at the office even during weekend hours.

Q: is duco cement good for crafts. I'm building a bridge and weight is going to be on it so if i use duco cement will the bridge be strong? the bridge has to hold 1,000 pounds at least and the pressure is going to be different on each beam.: I would avoid cements as often as possible because they're not good for lungs and also won't be flexible when dry... and may not be as strong as you want for some situations. Not many glues would be good for a thousand pounds of weight, though of course that would depend a lot too on the exact structure of the bridge --some would require no glue at all. You also don't say what *kind of materials* you'll be using and various adhesives are better for different materials as well. I think you'll want to look into other things besides glues for holding 1000 lbs, but the strongest glues I know of would be the polyurethane glues like Gorilla Glue, etc, which is even used for concrete. GG has to be clamped or weighted while curing though since it will swell and extrude out at the beginning, but some of the later brands of polyurethane glue may do that less. I think you'd be better off asking this in an engineering or construction category than in the hobbies category ...there's probably something like that here at YA. HTH, Diane B.

Q: I'm looking for a place to buy white portland cement, in small amounts, like around 100-200 pounds. I've looked at all the local hardware stores and can't seem to find anything but grey and I need white. thanks: This Site Might Help You. RE: Can someone tell me where to buy White Portland Cement? I'm looking for a place to buy white portland cement, in small amounts, like around 100-200 pounds. I've looked at all the local hardware stores and can't seem to find anything but grey and I need white. thanks

Q: based on the facts that acids and bases can burn skinwhy do you suppose that people that work with BOTH dry and wet cement should be cautios: The cement is somwhat caustic (not as bad as something like sodium hydroxide, but still able to damage skin on prolonged and/or repeated contact). Both the dry powder and the mixed cement can cause problems: the powder poofs everywhere when empting cement bags and during the initial stages of mixing. It can get inhaled and get on the skin. In both cases, there is moisture present from the body to react and form the semi-caustic mixture. In the case of the already mixed cement, when laying blocks, brick or using a cement pump etc, it is almost impossible to keep from getting splattered with the wet material. Since this type of construction work is often done day after day, a relatively modest amount of skin irritation/damage each day can have cumulative effects and really get to be a problem.

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