Abstract
For the waterproofing of tunnels and the uniform distribution of space between the lining of tunnels and rock, composite injection solutions are used. To improve the physical and mechanical properties of cement composites, the nanoconstruction effect is used, which is possible when using nanoparticles with extended geometry. Nano-additives and nanomodifiers consisting of nanoparticles, both natural and artificial and technogenic, can be used for the production of cement-containing solutions and concretes. For example, under certain conditions nanocrystalline powder of oxides and hydroxides of aluminum to nanotechnogenic raw materials can be referred to wastes of technogenic origin. The paper investigated the effect of nano-additives-boehmite, which is a waste of production, to increase the strength and frost resistance of plugging materials made on the basis of cement when administered. It is established that the use of boehmite as an additive in cements leads to an increase in the strength properties of concrete and increase its frost resistance, which is a prerequisite for long-term and reliable operation of the composite solution. Thus, the composite solution modified by boehmite is the basis for the creation of plugging solutions
Highlights
Concrete is the most popular building material of the 21st century
It is established that the use of boehmite as an additive in cements leads to an increase in the strength properties of concrete and increase its frost resistance, which is a prerequisite for long-term and reliable operation of the composite solution
The composite solution modified by boehmite is the basis for the creation of plugging solutions
Summary
Concrete is the most popular building material of the 21st century. Environmental protection and modern environmental requirements require the development of new types of concrete with a given set of properties. In the Strategy of Innovative Development of the Russian Federation, nanotechnologies and composite materials are considered as the main directions. For the waterproofing of tunnels and the uniform distribution of space between the lining of tunnels and rock, composite injection solutions are used. Due to the growth of scope of grouting work in the northern regions, specific problems related to the strengthening of soils in permafrost have become urgent. Conventional injection solutions are of little use, since in permafrost they do not adhere well and have a reduced rate of hydration, even with the introduction of accelerating agents such as calcium chloride
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