P.O 42.5 R/N CEMENT

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Specification of Cement

No	Detail		result
I	Chemical test
1	Loss on Ignition	%	2.0 ÷ 4.0
2	Insoluble Residue	%	0.3 ÷ 2.5
3	SiO2	%	19.0 ÷ 22.0
4	Al2O3	%	4.0 ÷ 6.0
5	Fe2O3	%	2.5 ÷ 3.5
6	CaO	%	61.0 ÷ 67.0
7	MgO	%	1.0÷ 4.0
8	SO3	%	1.6÷ 2.2
9	Free lime	%	0.3 ÷ 1.5
10	Toltal alkali, (Max)	%	0.75
11	(C3S + C2S), (Min)	%	54.0
12	C3A, (Max)	%	2.5 ÷ 3.5
14	C4AF, (Max)	%	7 ÷ 11
15	False Set, (Min)	%	50
16	Chloride, (Min)	%	0.1
II	Physiscal test		9 ÷ 11
1	Fineness Blaine, ( Min)	cm2/g	3400
2	Soundness: Lecateller test, ( Max)	mm	5
3	Air content or mortar	%	5 ÷ 10
4	Autoclave Expansion		0.03 ¸ 0.20
5	Setting time, (Vicat test) Initial, Final,	min	110 ¸ 160 200 ÷ 300
6	Compressive Strength 3 days, (Min) 7 days, (Min) 28 days, (Min)	psi	2320 3480 5220

Q:What did it cost? Is it worth the extra expense over vinyl?: ive been selling hardieplank and other cement sidings for ages and as far as im concerned they are the best siding option out there. not sure what vinyl costs but cement sidings go for about 90 cents.sqft here in CA probably less elsewhere. once its up its up and little to no maintenance and a 25yr guarantee.

Q:What are the building materials used in the construction of agricultural infrastructure?: Structural materials include wood, bamboo, stone, cement, concrete, metal, brick, ceramic, glass, engineering plastics, composite materials, etc

Q:Are they like the same...different? Idk: Cement is the gray powdery stuff that comes from a natural stonish product called 'klinker'. It is just ONE element to the concrete. To make simple cement stronger, you go for concrete: add sand, gravel and in the best of cases, rebars (iron rods) - that way the strength of both major elements are combined: 1- Concrete by itself is super-strong for compression, but cracks when pulled or bent (inflexible). 2- Iron/Steel is extremely tough to pulling forces and to some extent flexible. Combine the two and you got the stuff many skyscrapers are of.

Q:Cement is normally made of Calcium aluminate which are from Limestone and Bauxite. The active ingredients are mono-calcium aluminate (CaAl2O4) and mayenite (Ca12Al14O33).: Strength forms by hydration to calcium aluminate hydrates. They are well-adapted for use in refractory (high-temperature resistant) concretes, e.g. for furnace linings. ===== Note the term hydraulic - it means water is required as a chemical reaction occurs where the ingredient molecules react with water to form hydrates. Notice that the ingredients contain no water molecules and no hydrogen atoms. And from another article : Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood. The different constituents slowly crystallise and the interlocking of their crystals gives cement its strength. So you will have to research various theories, I don't have any more information.

Q:I just poured cement anchors for a swingset. Eventually, I will cover the entire area with a tarp and then 3-4 inches of pea gravel. I'm wondering how long I should wait, to do this. Should I wait a week or so for the cement to cure more, before I cover it up? Or can I lay down the tarp immediately?: You can cover it when ever you want. The cement is not drying, it is curing. The water does not evaporate from it, but there is a chemical reaction between the water, portland cement, and other components that make it harden to full strength. So have at it, just don't expect it to be at full strength till it finishes curing.

Q:My cat has urinated on the cement basement floor around the area of the litter box. It is my fault for not cleaning the litter box right away, but now I have a problem! I have tried dousing the area with vinegar and letting it air dry. Any other suggestions?: There's okorder and type in 'removing pet urine from concrete floor' and you'll find things that work. Vinegar isn't going to do it.

Q:how many bags of portland cement do I need to build a slap of 40m by 30 m by 10cm?: the concrete volume is = 40 x 30 x 0.10 = 120 m^3 of concrete each cubic meter of concrete require 6 bags of cement then total cement bags = 6 x 120 = 720 bags

Q:construction, cement, concrete: In the US, the predominate method for testing concrete strength is ASTM C31 and C94. C94 provides the general procedures necessary as C31 provides field methods. Generally speaking, concrete strength is directly related to water / cement ratios. The less water in the mix, the greater the strength. However, more water makes the concrete easier to place and finish. Superplasticizers are admixtures that improve concrete workability without adding water. There are also a variety of materials that can be added to concrete to increase strength in addition to a low water/cement ratio (0.35 or less). The number and explanation behind those materials and methods are beyond the scope of what can be covered here. But let it be understood the standard 3000psi concrete can be formulated to provide compressive strengths of 6000psi and more.

Q:what is the ratio for the cement to install cement block; sand, cement . and mortor creme?: for mortar mix it is 4 shovels of sand to one shovel of portland cement. Mix to your pefered consistity.

Q:If your whole body, except for your head, were to be buried in cement is it possible to survive?: no. Being you'd have to be put in while wet. As you breath your chest and ribs go in and out. once the cement sets your body cannot do this. so it would slowly crush you and you would die from not being able to get air into your lungs. Same thing happens to avalanche victims, they die from suffocation not from freezing to death (though the broken bones and such do expedite it)

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