Title : The use of polysiloxanes to improve the performance properties of cement
Abstract:
The development of methods for the directional formation of a durable structure of composite materials, obtaining products with specified performance properties with maximum simplicity of production technology and saving expensive raw materials is a priority task of any branch of the economy. In particular, in the construction materials industry. In the near future, concrete remains one of the main building materials. When considering concrete as a composite of coarse and fine aggregate, cement stone, water, and air pores, it is possible to formulate the main task of micro-, nanomodification as regulating the process of forming the structure of the material from the nanoscale to the macrostructure of the concrete mixture, as well as controlling the kinetics of the entire spectrum of chemical reactions accompanying the hardening process. Research on the properties of materials containing nanoparticles and nanostructures, the development of theoretical concepts of material modification, the development of specific technologies for obtaining new materials are priority areas of modern technologies and, in particular, technologies for the development of new building materials with specified properties. This task can be solved either by synthesizing new polymers or by modifying existing ones. The possibilities of synthesizing new polymers are limitless, but the technical and economic feasibility puts limits on its practical implementation, giving way to rich possibilities of physico-chemical and physical modification. Modern methods of prescription and technological modification of building materials have almost exhausted themselves. Building materials, including polymer materials, are composites with a clearly defined and developed phase boundary - this is the basis for successful improvement of properties by introducing various types of modifiers. The creation of polymer composites modified by the introduction of micro- and nanoparticles ensures a change in the structure of the matrix and leads to a significant improvement in operational characteristics.
In the present work, the physicochemical characteristics of the polysiloxane synthesized by us based on a reaction mixture of octomethylcyclotetrasiloxane, hexamethylsiloxane, sulfocationite resin intended for use as a micro- and nanomodifier in cement stones and concretes are investigated.
The mineralogical, chemical compositions and effective indicators of dispersion, density, rheological, and chemical activity of some raw materials – cement of various grades, crushed stone, sand, fly ash, etc. have also been determined.
Audience Take-Away:
- Our research can be useful for researchers and materials scientists involved in improving the properties of concrete
- in the development of new or improved cements
- Of course, the results of our research can be used in conducting classes for students studying in the field of production of building materials
- These studies are carried out within the framework of a scientific project sponsored by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan and aimed at solving a specific task: improving the quality of cement mix
- We hope that it will improve the accuracy of a design, or provide new information to assist in a design problem
