Technological Field:

The present invention relates to the production of cement with additives (or water with cement additives) and concrete produced with this cement (or water with cement additives) in the construction industry.

In particular, the present invention relates to a method of increasing the strength of concrete with boron nitride and a concrete admixture with low cost and very easy application.

State of the Art:

Today, concrete is used extensively in the construction industry. There are also additives that increase strength in existing concrete compositions. There are limits to the strength-enhancing effects of these additives. These additives are roughly in the form of regulators, plasticizers, additives for accelerated durability, some chemicals, additives for high-strength concrete, additives for low-quality concrete.

In the state of the art, studies on the main subject of the invention, namely increasing the strength of concrete with hexagonal boron nitride, have not been encountered so far. Recently, research has focused on graphene and graphene oxide additives and a certain success has been achieved. Although the effects of graphene or graphene oxide on strength are promising, it cannot be used as a concrete strength enhancer because it is a costly material. However, patents have been obtained to increase the strength of concrete with graphene and graphene oxide, and publications have been made in internationally respected journals. Some of these are listed below.

Patent applications in the table below have been found in the prior art.

To summarize, in the prior art, many different strength increasing techniques are used for cements and concretes. The chemicals or additives used in these strength enhancement techniques have high values in terms of cost. Further, since these additives will reduce the use of cement in concrete and it will reduce carbon emissions from cement production, it does not have a positive effect on carbon emissions indirectly.

As a result, there is a need for a strength increasing method in which the known state of the art is overcome and its disadvantages are eliminated.

Brief Description of the Invention:

The present invention is a concrete strength enhancement method which exceeds the state of the art, eliminates the disadvantages and has some additional features.

The aim of the invention is to increase the strength of concrete with hexagonal boron nitride.

Another aim of the present invention is to reveal a concrete admixture that is cost-effective and can be applied very easily.

Therefore, the present invention relates to the production of concrete with increased strength with a low cost additive. Therefore, it either provides the production of concrete with higher strength with the same amount of raw material, or it provides the strength normally obtained with less raw material. The most important features of the invention are; (i) it contributes to the construction of more earthquake resistant structures, (ii) it reduces the carbon emissions in cement production since less cement will be used for concrete with the same strength value.

The cement additive, which is the subject of the invention, can be added to the concrete (i) by making a dry mixture with cement and/or (ii) by using cement- added water instead of the water used in concrete production. As a result of the invention, the strength of concrete has been increased with very little hBN additive. Since the hBN additive is used very little, its contribution to the unit cost of the concrete will be very limited. In addition, less cement will be required, accordingly less cement will be produced, and as a result, less carbon dioxide will be released to the nature with the help of the production of concrete that will be produced using less cement and having the same strength as its equivalent concrete.

Further, considering the unit price of the admixture and the amount of use per ton (1 gram of hBN per ton of concrete), it will have almost no effect on the total cost of concrete raw materials. Cost studies have been carried out and the extra cost of hBN for 1 ton of concrete will be around USD 0.05.

Description of the Invention:

In this detailed description, the inventive method of increasing concrete strength is described by means of examples only for clarifying the subject matter such that no limiting effect is created. In the specification, a method of increasing the strength of concrete with hexagonal boron nitride (hBN) and a concrete admixture with low cost and very easy application is disclosed.

The effect of the invention is unique and this effect is to increase the strength of the concrete. There are two forms of application. These are as follows:

• Mixing the hBN powder with a certain average particle size (between 20 nm and 5 micrometers) into the concrete in certain proportions (between 0.00001 % and 0.05% by weight compared to the concrete) in a homogeneous solid state,

• Mixing the hBN powder with a certain average particle size (between 20 nm and 5 micrometers) into the concrete in certain proportions (between 0.00001 % and 0.05% by weight compared to the concrete) as suspension in liquid. In the first mixing method, hBN powders with a certain average particle size and certain proportions are first dried above 100°C for a certain period of time. The aim of drying is that the hBN particles do not stick to each other before mixing with the humidity in the air or the environment, and the adhered ones are separated from each other. The dried hBN powders are mixed with cement in a time sufficient for homogeneous dispersion with a ball or ring mill or a different dry mixing method. The “hBN added cement” (hereinafter referred to as hBN) resulting from this mixture is used to produce the desired concrete composition. There is no need for any change in concrete production processes.

In the second mixing method, hBN powders in certain average particle sizes and in certain proportions are homogeneously dispersed in the water necessary for concrete production and to be mixed with cement or cement-sand. This dispersion is carried out by using a dispersing agent that will prevent the hBN from suspending in water and sticking the hBN particles together. These dispersing agents are agents such as SDBS, SDS. The amount of use of these agents may be as much as the amount of hBN powder used, or slightly less or slightly more, depending on the agent used. This water-soluble agent prevents hBN powders from sticking to each other and keeping them suspended in water for a while. Water containing suspended hBN particles is added to the cement or cement-sand mixture as the water needed by the concrete composition. All subsequent processes are the same as the concrete forming processes.