New global standards for modern civil technologies constantly require more demanding infrastructure and stimulate the development of highly efficient multi-functional building materials. In particular, significant efforts are being made to improve performance and functionality of concrete, the world’s most used building material. Because most of the damage in concrete can be attributed with chemical and mechanical defects in the cement structure, the changing approach to improving the mechanical properties of concrete and providing new material functionality requires nanoscale intervention. Therefore, modern research efforts are aimed at studying new ways to improve the performance characteristics of concrete by nanotechnology of the chemical and physico-mechanical properties of cement, which is the main binding substance in concrete composition. Cement particles, which are composed of many chemical elements (such as calcium silicates, aluminates and alumoferrites), undergo transformation from powder form into fibrous crystals by reaction with water, known as a hydration reaction. Their growth and mechanical adhesion over time are the most significant factors in the formation of properties of the concrete material.
Graphene Institute has developed technology of mixing graphene into concrete, intended for the construction of various buildings, including construction of buildings in earthquake-prone areas.
Outstanding chemical and physical properties of graphene provide the most effective improvement in the internal matrix of concrete.
High-performance graphene nanoadditives of Graphene Institute allow solving the following problems:
• Reducing shrinkage, minimizing curing time and improving adhesion to prestressed reinforcement;
• Decreased sorption capacity, resulting in corrosion resistance, which is particularly effective in highly corrosive environments such as sewers. (Sorption capacity is the penetration of moisture into a concrete structure, through a capillary mechanism, which leads to the destruction of the concrete structure).
Graphene Institute has developed innovative graphene with thin atomic layers, a nanoengineered multifunctional concrete composite (MCC), which shows high range of improved properties over standard concrete. Concrete modifier MCC shows an extraordinary increase in load resistance:
– up to 90% in strength;
– up to 49% in flexion;
– reduction in maximum dislocation due to the compressive load by 70%;
– increase in heat capacity by 88%;
– substantial decrease (almost by 250%) in water permeability compared to standard concrete, which is desirable property for the long service life of concrete structures, making this new composite material ideal for construction in areas prone to flooding.
Such concrete has no competitors in the construction and repair of dams, the installation of foundations for power lines and wind power plants. Graphene modifier allows also to reduce content of cement in concrete and thereby greatly reduce price per cubic meter of concrete.
Presence of graphene nanoparticles promotes growth of fine grains. It means that the construction may be stiffer, have higher flexural strength, and resist cracking.
MCC creates fine grain structures and increases packing density to improve dimensional stability. Packing density has been shown to increase flexural strength, reduce weight loss from corrosion and abrasion, increase impact resistance, and enable production of stronger concrete. Graphene nanoplates facilitate creation of a fine grain structure and block existing microcracks. As is known absorption of moisture contributes to the great reduction in the service life of concrete. Graphene nanoparticles block moisture and other contaminants, both liquids and gases.
Graphene Institute produces aqueous graphene paste (AGP), which is the basis for the production of graphene concrete modifier MCC. The low cost of the AGP paste allows the production of modifier by low price. For large orders we offer modifier in concentrate.
Additives MCC allows to reduce content of water and cement in concrete, thereby total cost of the structure is reduced and the strength of mortar is increased. Additives are mixed with cement, sand and water for give base materials definite properties such as durability. Increased strength of concrete, decreased time for its consolidation and increase in hydrophobicity are the most attractive properties of concrete modifiers. The MCC product has high performance for all these properties, low price and low production cost. Most of the additives are available ready-made and can be added into mortar at the construction.
Graphene Institute offers two methods for promoting MCC concentrate:
– supply of MCC finished material;
– production of MCC adjacent to the production place of concrete. We propose equipment for production graphene materials at a low cost; it is also possible to sell sets of equipment for the production of MCC of any capacity.
Content of graphene in concrete in less than two percent (by weight), in fact, allows, for example, concrete of grade M150 be transformed into concrete B45 of grade 600.