Special drugs are added to water in an amount of 5-10% of the weight of cement in a solution that is kneaded on this water.
The most recently Ing. WITH. P. Shelyapin proposed adding a lime-bitumen paste to a cement solution, which is a mechanical mixture of calcium oxide (17 ° 0) and water (50%). The pasta is obtained at the time of repayment of the burned lime by the addition of bitumen heated to 160 ° C to 160 ° C and thoroughly and rapid mixing of the mixture. While added to a cement solution in an amount of 15-20% of the weight of cement1, the paste breaks up as the calcium oxide hydrates goes into calcium carbon dioxide, and free bitumen due to its great tendency to adsorption envelops all the voids of the solution of the solution. Paste is added to the water measured to clip the solution, and the water located in the paste is counted in the amount of water prescribed for the solution.
The application of underground structures made entirely from waterproof concrete is quite limited, partly due to the high cost of special drugs, partly due to fear of cracks, although it is not much difficult to eliminate.
To prevent the appearance of temperature cracks, it is necessary in structures with a significant length to arrange temperature seams through each 30 – 40 m, depending on the expected temperature fluctuations. The water resistance of the seams is achieved by sealing
The soap is dissolved in water, measured for concrete kneading, kvass or mixed dry with cement or added to a soap solution.
The limit of adding oil should be considered 10% of the weight of cement in concrete, since with an increase in oil content in concrete, its strength drops.
Mineral oil used for these purposes should meet the following technical conditions:
The fat cement solution of the composition is 1.0: 1.5 or 1.0: 2.0, applied to the isolated surfaces, then wiped with a steel or zinc grater to such an extent that the surface of the plaster acquires a dark uterine form, with abundant watering with water during hardening During careful work, it gives a waterproof layer that can withstand water pressure to M with a layer thickness in PTPU 2-3 cm.
