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:Removing rubber cement stains from fabric?
Rubber cement is a remarkable product used in household repair and crafting projects. It's true gift is the ability to adhere two non-porous materials together. Problems arise when this product ends up on clothes, upholstery or carpet fibers. The use of soap and water alone for removal will leave remnants of the rubber cement behind. Even large spills are removable using the correct method and cleaning materials. Getting rid of rubber cement on fabric surfaces takes 30 minutes to an hour.
Q:Does rubber cement float?
depends if it has a higher or lower density than water
Q:what is the ratio for the cement to install cement block; sand, cement . and mortor creme?
I am curently researching that very question. The average answer is 3 shovels of sand per one shovel of cement. However, I will be filling the holes of my cement blocks. I have read a few reports that pouring slabs or filling block holes you can use 5 shovels of sand per 1 shovel of cement. But, quite frankly, I am afraid that would be too weak for what I want. PS: I recommend your bottom blocks be laid with 2 shovels of sand per 1 shovel of cement. Then the rest can be 3 shovels of sand per 1 shovel of cement. Hope this helps. If you discover anything about filling the block holes, please e-mail me the info.
Q:Can Bees go through Cement?
No bees in my part of the world can go through concrete, or cement or wood, wood is used to make bee hives, (for honey bees) Carpenter bees will chew a hole in some woods (mostly soft woods) I have never seen a Carpenter bee chew a hole in a live or growing tree, The wood generaly has to be cut wood like a park bench or such.
Q:how is cement powder turned into cement?
I worked a summer for them while in college.) If you read the info you'll learn how rock is ground into cement and what additives go into the mix to change it's characteristics. Some additives make it harden faster or slower, some give it color, some do other things. The basic ingredients for concrete are cement, sand, aggregate, and water. The proportions of each make different quality of cement for different uses. Check it out.
Q:difference between 53grade and 43graade cement?
The OPC(Ordinary Portland Cement) was classified into three grades, namely 33 grade, 43 grade and53 grade depending upon the strength of the cement at 28 days when tested as per IS 4031-1988. If the 28 days strength is not less than 33N/mm2, it is called 33 grade cement, if the strength is not less than 43N/mm2, it is called 43 grade cement, and if the strength is not less than 53 N/mm2, it is called 53 grade cement
Q:Can I use sand under cement blocks and/or slabs? Will it sink?
You are going have to put some form of bedding like crushed stone under the sand first sand itself won't do the job as for cement that won't do either using concrete is the preferred method again laying on a bedding of crushed stone you don't specify the area you want to cover over so all I can say is you will need to excavate the area firstly to a depth of 6 inches minimum that will allow for 2 inches of crushed stone a weed blocker/plastic sheeting 2 inches of sand and cement dry mix and using a slab 2 inches deep to rest on there.Also a slight slope will need to be made to allow surface water run away from house and not be allowed flow back towards your patio.If you decide to use concrete again cut out 6 inches of ground and 3 inches of crushed stone weed blocker and a concrete slab when pouring concrete try to keep it semi dry,too much water is not good as when concrete drys it shrinks and can cause cracking later,I don't think you would have to re-inforce it as you won't be using the car on there ok.
Q:Do you have cement counter tops?
Cement counter tops are more expensive than Granite, per square foot. Very labor intensive to build. You then need a good sealer and need to be careful about stains.
Q:Mixing sand and cement?
I use a wheel barrow to mix my concrete and a hoe to mix in the water. It works better then a shovel. A ratio by volume is not hard to measure. Just put in four times the amount of builders sand that you will use in cement. A plastic container will do if it is large enough.
Q:How many days does it take a quick sand cement to achieve its' strength on a building, bridge.?

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