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The effect of iron on cement -?

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I decided to plaster the base, scored sand, kneading a 1x4 solution. I plastered, I come and foyevyu. Everything is cracked. What can be wrong?


My sand is strange, orange, apparently with a high iron content. Well, there is a bit of clay. What is the problem? Is cement incompatible with sand?
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16 comments
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He poured water twice, gurgled both times, he still grabbed! The color has become much darker, even from above and dry. Holds tight, only cracks (Well, now I will know ...
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flooded everything with water, covered with rags, maybe a ride? Everything was great, hissing. The solution has become relatively stronger these days.
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Quote: Dmitrij
Yes, everything is correct, it worked in the sun :(

And if you do in the evening, enough night?

Well, there was a reason !!! Stopudovo, the solution has dried in a couple of hours !!! If not faster ...)))
Better to wait for a cold snap. It can also be hot at night, and the relative humidity can be low. If it’s unbearable, then it’s possible at night, and early in the morning it’s good to spill out of the hose ... And then, during the day several more times !!!
Large volumes - and then cover with a film if it's hot. And the thin layer will definitely dry up !!!!
For cement bonding, approximately half of the water should remain in it during setting. That is, per kilogram of cement - half a liter! This is WHAT SHOULD NOT DRY !!! This water will bind and remain inside. If there is less of it - get scattering and cracking, but not a "stone".
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We had one weirdo before the price hike I bought 20 bags of cement, for the future -))). Why was we here because he left for Moscow. Now he has an apartment in Moscow, that’s the eccentric.
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Yes, everything is correct, it worked in the sun :(

And if you do in the evening, enough night?
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Valery,
That is not like flour. Moreover, the cement type is expensive, Bulgarian ...



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Dmitrij,
And more about water ... If the water dries out of the solution - it will also crack !!! That is, the sun's rays did not fall? Not dry solution? ...
Water is involved in the reaction. It should not dry in any case !!! If the direct sun - you need to shade, water, etc. That is, do not allow water to dry out of solution. Otherwise, we’ll get not a “stone”, but a “lump of sintered sand”, which in your case happened ...
Maybe this is the case?
I once laid the masonry out of inexperience in the hot sun and did not water the freshly laid bricks with water. The next day, everything had to be thrown off and shifted, because the mortar with bricks was cleaned off with hands, scattering like a lump of earth ...
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And by the way, cement ... Few pay for its shelf life. With good proper storage, it may not “go groats”, but “remain flour”, but at the same time, if it was a couple of years, lose the brand to almost zero!
Not old cement then?
Because iron is nonsense! In the solution, the brand is affected by the cement and the hardness of the filler (and not its composition). In fact, grains of sand should be enveloped on all sides with a thin layer of cement, which will act as glue. And already, these sand grains are made of chegsho - it does not matter!))))
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Water was also used very hard. In it, everything instantly rusts and a strong white precipitate when boiled. Well, today I’ll try to knead without anything.
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Dmitrij
Try to make a little cement without sand itself, how it behaves, maybe it is in the water and in the sand, it is advisable to freeze in the sun and mix well, a thin ball, maybe even the cement is bad (wet)
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Valery
You still have a quarry there near our Shatsk Lakes, in your extreme south-west of Belarus, there is also some kind of stone being dug
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That no, did not add. but the solution did not work out at all. In the hands of everything crumbles. I don’t understand what it is. Proportions of 1 bucket of cement to 4 buckets of sand. Cement 550. Clay there seems to be not so much.
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And as for the iron content, so near my "small homeland" (Dolbnevo village, Kamenetsky district, Brest region. Belarus) is the largest natural gravel deposit in Europe. And its color is exactly bright orange !!! So I, for example, until adulthood and did not know that the sand may be "not orange")))). We have it all like that ... Only the river sands are light yellow. But they are not used in our region for the preparation of mortars and concrete - their grains of sand (if you look under a microscope) have a rounded shape and the concrete is less durable than from quarry sand with "pointed" grains of sand ...
But recently in Odessa I saw how the solution was interfered with from the sea (!!!!). So not only that - he was not even sifted and there was a shell rock in it (!!!!) .... I just can’t imagine how reckless you need to relate to your work in order to allow this to happen !!!! Not washed (with salt) sea sand ... and even with shell rock !!! What the fuck is the strength grade of this solution?
I’ve bought washed sand of the highest class at my construction site, although I could dig up a regular quarry for free !!! (I also dug it on "non-responsible constructions" like rough screeds). But on the floor? Or on borders and paths ??? Yes, not only washed sand is needed for this, but also cement, preferably D-0, and not D-20.
And then they complain that they have been peeling for 10 years ....
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I don’t think that you didn’t add lime, but ... just in case you didn’t add (But what if it’s enough ...)))), I’ll immediately write that they are plastered ONLY with an elastic composition.Ellasticity is given either by lime, or special chemical additives (which is not realistic in the case of a home-made solution). If lime is not added, the thickness of the vertically located layer without reinforcement should be at least 6 cm !!! Otherwise, cracking due to uneven thermal expansion of the solid composition. (It’s indoors! It’s thicker on the street!) With a mortar of lime, you can at least spread a millimeter of thickness!
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And how much lime poured ??
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There may be a lot of clay in the sand, it is not very compatible with cement, as it collects water. It also depends on the thickness of the ball and the drying speed, the upper part dries quickly, and the lower one more slowly

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