Since last fall, after the completion of my left 6 bags of cement. What would keep them until spring, I carefully packed them in plastic wrap. But opening them in April, I saw a bleak picture. All 6 bags of cement hardened.
I began eagerly read the Internet to find a clue as to how to use or recover the cement. That only there is not advised, what nonsense not just talking. Let's start in order ...
1. Some "experts" claimedThat by breaking the cement to a powder and adding it to the solution and the concrete in the amount of 50%, we did not lose in the strength of the concrete. In reality, the additive should be no more than 10%, or, anyway, in the strength of the solution, you will lose.
2. Second, common council - a fry petrified concrete. Supposedly, after frying properties of the cement restored. This method is part of the faithful, but it is not feasible in the home.
The fact that the cement restore their properties by 90% it needs to fry at 1300 - 1500 degrees
. House on fire or in any oven to reach such a temperature, you can not. The maximum that you will achieve - is 400 - 500 degrees, Which is not enough for this method.But even if we imagine for a moment that there "Kulibin", And constructed with a turbo oven puffing, wherein the temperature is 1500 degrees, the question arises, how much fuel he burn to achieve such a temperature and for firing at least one bag-cured cement? In my opinion, it would be cheaper to buy fresh cement than to burn old).
3. And finally, the most correct and real way applying zakamenevshego cement - is to break it into pieces of 5 - 8 cm, and add it as an aggregate in concrete no-load designs: the blind area, paths, different platforms... But it should not be used as the main material, and the like additive. Ratio: 3 parts of sand or gravel, and 1 part of the old cement.
Also crushed cement stone can be added to the floor screed in the pillow for laying paving slabs, etc ...
Summarizing the article, I want to say again: in any case, do not use petrified cement supporting structures! Only use as an additive in a proportion of 1 to 3 to main concrete filler.
Remember that security - is the most important factor for any construction. Do not tempt fate, dear readers!