SPM photo of the grain of nanocement 90, К-82,5, with nanoshell. In the area near the nanoshell the particles of quartz are observed
Nanocements are cements, whose grains are covered by solid shell in the process of grinding, i.e. mechanical activation. This shell is a capsule with thickness of several tens of nanometers of modified polymer compound, which imparts a radically new quality toPortland cement and concretes on its basis.
As a result of more than 20 years of research of new cements, it is established that outstanding properties of the materials were associated with the formation of nanoshells on the surface of cement particles in the process of its mechanical activation with accompanying grinding, through vaccination and the changes in the composition of the structure of modifier’s particles, when functional groups of polymer substance interact with calcium and oxygen active sites on the surface of clinker particles, saturating with calcium cations and forming a solid nanoshell, presumably, of the following composition: С10Н7SО3Са.
Principal competitive advantages of nanocements
Feeding up to 70% of mineral additives with increase in cement production while maintaining its high grades without building new burning units
Utilization of local non-metallic aggregates (sub-standard sand, gravel, natural rocks, slag, ash) in production of super strong concretes
Usage of semi-finished (clinker) and sub-standard cements (stale, clotted, other)
Regulation of cement properties as per design task (desired strength, setting time, water resistance, plasticity, color, other)
Production of concretes of high and super high strength (higher than B60 class) with high water resistance (W12–W20) and resistance to sulfates, chlorides and soft acids
Economy of 30–50% of steel (reinforcement) in strong and super strong concretes
Speeding up of materials hardening, which reach 60–70 МPа of strength within 24 hours , and within 72 hours – acquire strength no lower than 70% of branded strength of concrete, aged 28 days.
Reduction (by 2–4 times) of cement consumption under the production of binding substance branded as 300–500 due to joint mechano-activation of silica additives (fined-grained sand, ash, slags)
Reduction of energy and resources consumption in production of concrete products by excluding steaming practiced for their quicker hardening
Production of architect concrete of enhanced ornamentality (pure tone, bright color) resistant to salt efflorescence on the surface of a product, which could be the result of exploitation in contaminated conditions of megapolises
Manufacture of products made of architect concrete with characteristics close to natural granite but cheaper by 3-5 times with the possibility of grinding and polishing