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: we are thinking of using fiber cement siding to replace masonite that is getting soft spots in it. we are also considering vinyl.: Fiber cement (best brand is James Hardie) board has a 50 year warranty, needs paint every 7 years or so, depending on paint quality, facing (North and East less often than South and West) and climate. Much better long term than vinyl -- over time the oils will cook out of the vinyl, leaving it chalky looking and very brittle.

Q: I am cofused~ what is the difference between water-based cement and glue~~: Water based cement is different because you can clean it up like really fast if you have soemthing to do so... Once it dries completely you can't clean it up with water anymore. And glue doesn't clean up that way...plus water based cement can give you better results =) hope this helps

Q: will i get crutches from er if i hit my knee cap on the cement step and went to the er or walk in clinic please explain and what if i just go in hopping in on one leg do you think they would give me crutches. do they show you how to use them please explain i want to use crutches: It's unlikely to get crutches by slamming your knee into a cement step. As your kneecap is quite hard to break, that injury would most likely cause bruising and laceration. All the ER would do is to disinfect the wound (if it was open), bandage it up, perhaps give you painkillers. If you want crutches, the best way to do it is to fake it - go somewhere out of sight, and decide you twisted your ankle badly.

Q: On the gas tank of my motorcycles is edged rubber and edged thin steel. The edged rubber slides into the edge of the steel. Some of the rubber has come off the edge of the steel, and I was wondering how could I glue it. I thought of rubber cement, but I don't know. Also should I prime the steel by taking some light sandpaper to it? Thanks.: use some good super glue.. it makes a stronger bond. and the excess can be sanded off after it dries, its better to over apply than to under apply.

Q: please i need help cause i don't know y we r doing this experiment in the first place any one ?: You sure it is called cement motors. I know tensile strength of cement briquettes ( used to test the strength of cement in to know if satisfactory for gripping on to rebar) , but sorry never heard tensile of cement motors. Try typing the exact question you were given.

Q: My Tile backsplash installer left 1 1/2quot; hardiebacker exposed at the top for me. I am finding out that it's not that easy to cut. It is 42quot; wide and I need to make as straight a cut as possible so I can put my rangehood flush to the wall. The cement board is 1/2quot; thick. Cabinets have already been installed on either side. Please help. Thanks in advance.: Cutting Cement Board

Q: ive just got my braces fitted today, and at the back of my mouth i have some cement to stop me biting hard and breaking my braces. The problem is i find this cement really uncomfortable. will the cement wear down a bit ? or i will i get used to it? please help x: I know...tell me about it. I hav braces now..and i still remember the day i got them put on. The cement should wear down a bit. My mouth was so sore, so many canker sores, but enough with that. I know that cemement gets REALLY annoying cause i have some on my teeth too, but i don't notice it anymore. but then again that's just me. Everybody is different. I can't say how long it will be until you don't notice it, but i can say that in a while you won't even know it is there. Sometimes i don't even remember that i hav braces on my teeth! Don't worry, you won't notice it in while and just think after they come off you'lll have beautiful teeth! all nice and straight.

Q: on my way to work i drove by a cement truck that was pouring the cement to lay new side walk is that bad is there anything in the air that i can get from that or any sort of skin reaction: cement can be very bad on your skin if your in it all the time, it has lye in it. i wouldnt breath it either.

Q: I am installing a 3-foot wooden picket fence.: Cementing the posts in the ground will hold longer. My Dad put up fencing all his life and this was his preferred method. He was always pointing out fences that he put up 20 or more years before.

Q: How is cement used to make concrete?What are the principle types of concrete and how are they made?: We added sand, rock and water to cement to make a boat ramp, diving board platform, a seawall secured with pilings that went across two lots that included a patio and boat dock. We used different concrete mixtures since the seawall was poured in a form with reinforced steel that was in the water. The cement was poured through a large plastic tube. The pilings also had a plastic tube which we had water running through to help get them into the ground. And on one the learning channels I remember that the Autobahns has held up better than our roads because it had a deeper foundation, I believe it was 2 inches deeper. I imagine that there are different mixtures for concrete depending on the purpose it is for and the weather. This is from 45 years ago memories, so check it out.

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