The film tells about chemical additives to concrete developed by Soviet scientists, which improve the structure of concrete, its use and transportation.
New building.
Crane.
Reinforced concrete structures.
Hydroelectric dam under construction.
Pouring concrete into the dam body.
Testing concrete structures for strength.
Alternating shots with concrete structures.
Concrete is mixed with additives in the laboratory.
The concept of chemical additives in concrete.
Six classes of chemical additives.
Class one - regulators of rheological properties of concrete mix.
Class two - regulators of setting processes of concrete mixes and hardening of concrete.
Class three - regulators of concrete structure.
Class four - inhibitors of steel corrosion.
Class five - additives for giving concrete special properties.
Class six - additives for replacing part of the cement.
Study of additives in the laboratory.
Newspapers of the forties of the twentieth century, which report on the inventions of various additives to concrete.
Reference books of the 30s, which describe additives to concrete.
Scientists are working on new additives to concrete.
Scientists show the effect of superplasticizers on concrete.
Chemical formula of a plasticizer.
Cartoon explaining the mechanism of action of a plasticizer on concrete.
The use of superplasticizers allows for the wide use of the casting method for molding reinforced concrete.
Successfully concreting densely reinforced structures.
Laying concrete mix with reduced water content under short-term vibration.
Superplasticizer allows for the production of high-strength concrete and especially dense concrete using ordinary cements.
Testing the strength of concrete with superplasticizer.
Plasticizers are effective for the production of precast reinforced concrete.
A line for manufacturing such parts.
A meeting of Soviet and German scientists is being held at the Research Institute of Concrete and Reinforced Concrete.
Surface-active substances are often used as plasticizing additives.
Chemical formula.
These include technical lignosulfonates.
Studies of lignosulfonate in the laboratory of the Research Institute.
Lignosulfonate processing unit at a reinforced concrete manufacturing plant.
Loading concrete with additives into a mold.
Classification of concrete additives, Plasticizers, Chemical formulas, Reinforced concrete structures
Moscow
Research Institute of Concrete and Reinforced Concrete.
A researcher examines photographs of concrete after exposure to cold.
Air-entraining and microgas-forming additives are used to improve the structure of frost-resistant concrete.
Chemical formula.
Testing concrete with temperature changes from positive to negative.
Air pores serve as a localizer of stresses arising in concrete.
Laying highly frost-resistant concrete in the building of the Zeiskaya hydroelectric power station.
Samples - cores drilled from the dam body were subjected to thorough and comprehensive testing.
After 300 cycles of freezing to minus 50 degrees and thawing of the cores, no signs of concrete destruction were found.
The durability of concrete depends on the nature of the pore space and the structure of concrete.
Concrete samples with destruction.
Specific requirements for concrete are imposed by conditions of alternate wetting and drying, capillary suction and evaporation of high-concentration salt solutions.
Special additives have been developed that significantly increase the durability of concrete in irrigation and hydraulic engineering construction.
Panorama of the irrigation system.
Road in the Far North.
Concrete mixer driving along the road in the south of the USSR. Antifreeze chemical additives and hardening accelerators.
Formula.
Laying concrete at low temperatures.
Using concrete in areas with dry and hot climates.
Hot and dry weather creates special difficulties in the preparation, transportation, laying and care of concrete.
Pouring concrete into densely reinforced structures.
Setting retarder additives.
Chemical formula.
These additives help maintain a constant water-cement ratio and controlled initial and final mobility of the concrete mix at an outside air temperature of 35-40 degrees.
This significantly expands the possibilities for transporting concrete mix over long distances.
The laboratory is working on creating complex modifiers.
Among the additives regulating the setting and hardening process of concrete, calcium chloride and other chloride salts have proven to be the most effective means.
However, all of them significantly intensify the corrosion of reinforcement.
The solution is to use accelerators in combination with steel corrosion inhibitors.
Formulas.
For remote areas of the country, Siberia, the Far East, and the Far North, the production of complex modifiers in powder form has been mastered.
Professor V. Batrakov tells us.
The Chernobyl nuclear power plant after the accident.
The launch complex for the Buran rocket.
Landing of the Buran.
The line for forming reinforced concrete slabs.
Alternating shots with chemical formulas of additives.
Additives to concrete, Reinforced concrete structures
V. Batrakov
professor
Siberia Moscow
Zeyskaya hydroelectric power station.