Portland Cement fromchina inbags

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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



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Q:Why does wet cement have a strange odour?
It is from the gasses that are released during the chemical process when cement reacts with water to become fused into a solid mass.
Q:This year, steel, concrete, sand, stone and other building materials prices how, compared with last year is high or low? As long as probably, do not need too much can also,
According to the international market conditions, especially in the European market, the recent rupiah on the euro exchange rate continued to fall, short-term rebound may be, and its European steel market prices continue to rise, the above view the price of steel prices may rise
Q:Which is the main mineral in cement ?
No it is: Tricalcium Silicate (C3S) C3S is the most abundant mineral in portland cement, occupying 40–70 wt% of the cement, and it is also the most important. The hydration of C3S gives cement paste most of its strength, particularly at early times. Pure C3S can form with three different crystal structures. At temperatures below 980˚C the equilibrium structure is triclinic. At temperatures between 980˚C – 1070˚C the structure is monoclinic, and above 1070˚C it is rhombohedral. In addition, the triclinic and monoclinic structures each have three polymorphs, so there are a total of seven possible structures. However, all of these structures are rather similar and there are no significant differences in the reactivity. The most important feature of the structure is an awkward and asymmetric packing of the calcium and oxygen ions that leaves large “holes” in the crystal lattice. Essentially, the ions do not fit together very well, causing the crystal structure to have a high internal energy. As a result, C3S is highly reactive. The C3S that forms in a cement clinker contains about 3-4% of oxides other than CaO and SiO2. Strictly speaking, this mineral should therefore be called alite rather than C3S. However, as discussed in Section 3.2, we will avoid using mineral names in this monograph. In a typical clinker the C3S would contain about 1 wt% each of MgO, Al2O3, and Fe2O3, along with much smaller amounts of Na2O, K2O, P2O5, and SO3 [2]. These amounts can vary considerably with the composition of the raw materials used to make the cement, however. Of the three major impurities, Mg and Fe replace Ca, while Al replaces Si. One effect of the impurities is to “stabilize” the monoclinic structure, meaning that the structural transformation from monoclinic to triclinic that would normally occur on cooling is prevented. Most cements thus contain one of the monoclinic polymorphs of C3S.
Q:A horror movie about being people being locked in an underground room and buried in wet cement?
I watched this a few nights ago on On Demand (for free) and plan to watch it several more times if possible. The movie does open with a little girl sealed inside walls, then cement begins pouring in. The scene cuts away just as only her face is out of the muck~a very chilling moment!
Q:Is cement poisoness? Flammable? Explosive? Corrosive?
Cement is not poisonous (since it is made from burnt stone) but I have never heard of anyone tempted to eat it. It is definitely not flammable (and is used for fireproofing over steel beams). If there is a great cloud of cement dust in the air in an area that has a source of ignition that dust could explode (not very common and only applies to the dust.) It is mildly corrosive when wet before it cures (only a problem during first few days after pouring it).
Q:Cement - renewable materials?
I would have to say C but B is also attractive. I could make the case that the rock that is used for cement is the result of hundreds of thousands of years in geologic processes. The energy spent to produce the cement is used. However, I could say that cement is very reusable. Old cement can be ground up and reused quite readily. sorry but the question is quite open ended. That is unless your teacher specified an answer in class and you just didn't catch it!
Q:Is there a law about the distance between the cement plant and the residential area?
Is there a law about the distance between the cement plant and the residential area?
Q:Rubber cement glue help?
that depends on whether or not you want to be able to take the papers apart later or not. if you do then i would go with the rubber cement, if not then elmers all the way. another thing to keep in mind is that elmers glue is known to cause the paper to crinkle and in my opinion, that ruins the presentation of the whole project.
Q:Which is better, in building a road: Concrete, asphalt, or cement?
Thats going to depend on its purpose, expected use and local climate. concrete is the outgrowth of cement, cement is not used for roads. reinforced concrete is the strongest of your choices, but requires regular maintenance over time, pure concrete could be used for a driveway, but no one does that anymore.
Q:Can dried cement be removed from clothes?
You should generally try to remove any matter before it has a chance to set. But even when the cement is dried, try wiping with a cloth dipped in warm sudsy water to which a few drops of amyl acetate has been added. Rinse well and wipe dry. Cement can occasionally damage the surface of the clothes, so work carefully.

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