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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:2011 building materials reinforced concrete price movements, I now cover the next year or cover? The: If your money is not too well, it is recommended that you still finish the foundation in winter, because it can avoid the rainy season, winter groundwater is relatively shallow The ground processing is over, you can wait after the year to see the situation, whether immediately connected to the superstructure, if the price trend is very powerful, you should immediately repair or simply wait for a long time to say, in short, are good to say If the price falls, of course, better, but our country in recent years on the iron ore import price negotiations have been at a disadvantage, so iron ore prices do not come down, the price of steel is unlikely to decline So I think the winter for the best, next year, as the situation again

Q:l need to know- thankyou,xx jo: i think cement

Q:I am working in concrete fieled practice and i would like to know more about the cement and microsilica, that is my concern.: Cement is made by heating limestone [CaCO3] with small quantities of other materials (such as clay) to 1450°C in a kiln, in a process known as calcination. The resulting hard substance [CaO], called 'clinker', is then ground with a small amount of gypsum [MgSO4.2H2O] into a powder to make 'Ordinary Portland Cement', the most commonly used type of cement (often referred to as OPC). Portland cement is a basic ingredient of concrete, mortar and most non-speciality grout. The most common use for Portland cement is in the production of concrete. Concrete is a composite material consisting of aggregate (gravel and sand [impure SiO2]), cement, and water. As a construction material, concrete can be cast in almost any shape desired, and once hardened, can become a structural (load bearing) element. Concrete consists of highly insoluble calcium silicates (CaO+ SiO2 -> CaSiO3). Now silica is pure SiO2 and so finely grounding it and putting into the concrete mixture instead of more coarse sand almost certainly results in a better product with better mixing and hence a stronger cement. This is an educated (I hope!) guess by an inorganic chemist. Cheers, dr p

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:I need some rubber cement thinner but dont want to pay the outrageous amount being asked for my local arts n crafts store. Is there something than can be obtained cheaper at my local home goods place that will do the same job?: OKorder lists 4 oz of Bestine thinner for $2.97 how much do you need? Rubber cement contains heptane and isopropanol. If you ask at the home products store what would thin it, you might find something, but I would just order the Bestine thinner if I were you

Q:Im in the middle of planning to build a deck I'm my backyard and was looking through materials and noticed that concrete and cement were listed differently and that concrete was twice as expensive as cement. I'd always thought they were the same so I was just wondering what the differences were and how they work differently.: Cement is the binder that you use with sand and aggregate to make concrete, or with sand (and sometimes lime) to make mortar. Most usual is Ordinary Portland Cement which has nothing to do with Portland Stone apart from a passing resemblence in colour. Cement is rarely used on its own as it crumbles very easily but when combined with other materials it becomes very strong. Many people make their mix too rich on the basis if a little is good, more is better. It isn't and is a common cause of failure so mix accurately and always use clean water. The set is a chemical (irreversible) one and generates heat. It is only any good in compression though, if you need it to span any distance you need to include steel or other reinforcement in it to give it tensile strength.

Q:Describe and Differentiate Portland Cement and Pozzolonic Cement?: The common variety of cement is known as normal setting or ordinary cement.It was called Portland cement because it had resemblance in its colour after setting, to a variety of sandstone which was found in abundance in Portland of England.Pozzuolana is a volcanic powder which can also be processed from shales and certain clays.The % of this in cement is 10 to 30.This cement is used in marine structures ,sewage works and foundation under water.

Q:please tell me the order of increasing strength of cement mixtures1)cement mixed with river sand 2)cement with lime3)cement with pitsand4)cement with rice huski think order is 2 gt; 3gt;4gt;1 (strength)i am not sure.please tell me the correct answer along with explanation.: we assume the cement (Portland cement) is of the correct ratio. we also assume we are talking about compressive strenght when we have just enough cement to fill the spaces between the rock we have reached the maximum strength. number 2. is no good as it reacts with the cement mixture number 4. allows for compression and cracking of the cement. number 3. .....pits i dont know what is pits number 1. is the same as rock ......the best here so .... the order my guess ....... 2,4,1

Q:how is cement prepaed? what are the uses and different types of cement?: I've been in exactly the same situation. We live on the edge of nowhere and can't get delivered concrete. We poured our greenhouse floor, using Portland premix cement and a mixer. Our mixer is slightly smaller than yours. We used extra water in the mix so it would stay workable longer. Bad idea! The floor did fine until the first winter. It then split, chipped cracked and, well, you get the picture. We ended up redoing it. The second time we divided the floor into three sections. Each section had its own small 3/8 rebar web placed 2 above ground in a 4 floor. We supported the web by driving 10 pieces of 3/8 rebar into the ground and wire to hold the web to them. Lastly, on the sides where the adjoining sections would go, we used 1 x 6 pieces of redwood. We drilled them and ran rebar through to the web – leaving 2' sticking out for attaching the new sections. That piece sticking out was attached to the next section's rebar web. It has been there for several years now, and has no cracks at all. Our temperatures range from 105°F in summer to -40°F in winter. I put a link in to show how to determine how many cubic yards of concrete you'll need. Good luck!

Q:i know it's by adding water but what happenes to it tom make it turn into cement?Thank you!: First of all its Portland power and then aggregate (rock) and a little sand. when its mixed a chemical reaction occurs and it binds it all together and dries then its cement

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