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:why cement board over hardie backer board when laying down a counter top for kitchen sink?: You don't. You use cement board (Durock) over 3/4 plywood if doing a tile top. There is no reason to use hardiboard under Durock. Hope this helps.

Q:I am replacing a kitchen floor with tile. When I ripped up the existing floor there was plywood in great shape. Do I really need to lay cement board down beofre tiling? What could happen if I dont?: Had to scroll all the way to the bottom to find someone (Miss T) who bothered to consider what you were tiling over. If you are on a slab, no need for cement board. If you are on a raised foundation you need to make the substrate rigid enough to resist flexing. There are several ways to do this-another layer of ply (stagger seams with respect to the existing layer), Hardibacker, Wonderboard, etc. I generally use 2 1/2 inch screws to secure the existing substrate to the joists first regardless of what I'm installing over it. I occasionally sister 2 x 4s to the existing joists if the floor is particularly bouncy, or add cross bracing. I've never had a call back on any of my tile work (going back 25 plus years) Thinset doesn't stick to wood? install mesh? Where are these people coming from. Mesh is NEVER used on a floor and it wasn't used 50-100 years ago either. Only on walls and counter tops and thinset adheres to plywood just fine.

Q:How to start a cement factory?: Are you talking about a plant that supplies bags of cement mix like you'd buy at Home Depot, or a plant where you fill the cement mixer trucks and they go out and pour the stuff into whatever? Either way, the easiest way might be to find a defunct one and reopen it.

Q:i used cement to seal large gaps in the house, but in an upside down suface where i used lots of it on, touching it makes parts of the surface turn into powder and chunks fall off. I did it rudimentary with my hands and a smoothed it as best as i could then but still looks and feels messy. The holes are filled and its solid, the surface though is powdery.: Cement never sets up properly when you play with it with your hands like it's clay. If you ever watched a mason, they never play with it like that. then too, you probably made the mix too thin and that causes it to set up even slower. You really should have got a pro to do it...please do it the next time, which will not be very long. Papaw

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.: clean the floor where the wall will be with muriatic acid be sure to wear a mask to protect you from the fumes, then place anchors of some type in the motar joints of the existing walls that you are tying to that is all the support you will need,approx. every 3 joints or layers.

Q:How can I dizzolve the cement that the dentist puts in you mouth to seal in a pallet expander? Can i use a house hold fluid? Or can i chip it away? Or what?: If you are not still near your orthodontist, go to a general dentist as Jess said. He/she can polish it off. There is NOTHING that will dissolve it. Nothing. Nice picture, Jess.

Q:how does sediment compact or cement into sedimentary rocks?: Lithostatic load! As sediment is deposited into basins, the pressure from the weight of the overlying sediment presses and squeezes the seds into hard, rocky bodies. Water plays a part of this as well. Water can allow for the precipitation of cement in sandstone (Calcium Carbonate).

Q:i need to paint cement statues What do i paint them with. how do i paint them and where do i buy this paint? thanks:): Is this near/around a pool or water source? Cement must be sealed, then painted. Go to B. Moore paints or Bear paints. Lowes Home center carries both I think. The paint for cement is a special blend that must be used. Can use paint sprayer.

Q:Did anyone die in cement at hover dam?: Isn't that where Jimmy Hoffa was tossed in? ;)

Q:I'm doing a small outdoor project and I need to stick some construction paper on to painted aluminum. I have some rubber cement from a craft store. Will this adhere to the metal and survive outdoor conditions of snow, wind, rain etc?: Nope. Contact cement would be better. But I don't think anything will last long out of doors. Even the paper will start to fall apart after the first rain or heavy dew. And the sun will also cause it to decompose. Paper does not do well outside. You may have to rethink your project.

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