Goals and Objectives
The objectives include research into the following processes:- Self-healing of metals and alloys, prevention of metal fouling;
- Self-healing of concrete based on the use of bacteria and microcapsules in tunnel construction and other construction fields;
- Self-healing of asphalt mass and porous asphalt concrete using induction heating. This goal will be achieved after a set of works, including the development of nanocontainers and nanoparticles to be included in paint coatings with a mass fraction of up to 10%. Coatings will be evaluated in terms of metal corrosion behavior, tribological properties, health protection aspects, and environmental safety.
Scientific Results
- The self-healing characteristics of encapsulated self-healing asphalt concrete were investigated. Samples of unaged, short-term aged, and long-term aged asphalt beams were tested for three-point bending. The release rate of the rejuvenating agent before and after self-healing was quantified using IR spectroscopy.
- The development and influence of Bacillus cohnii bacteria on concrete crack healing, compressive strength recovery after pre-cracking, sorption capacity, water absorption, and concrete microstructure were investigated. Various curing methods with different moisture levels were used during strength development. It was shown that bacteria effectively heal microcracks occurring in concrete during curing, improving its characteristics at 28 days of age.
- It was shown that the inclusion of Pseudomonas bacteria in the concrete mix led to a significant increase in compressive and tensile strength. Compared to conventional concrete, results showed a maximum increase in compressive strength of 16% and a maximum increase in tensile strength of 12%. Bacterial concrete exhibited lower weight loss and higher tensile strength than conventional concrete when treated with 5% H2SO4 or 5% MgSO4 compared to the control concrete.
- Finite element analysis (ANSYS 15.0) was conducted to study the influence of bacterial concentration (bacterial mass to cement mass of 1%, 2%, and 3%), species (Bacillus subtilis, E. coli, and Pseudomonas sps.), and loading type (single-point load, two-point load, and four-point distributed load) on concrete beams. Two beams were selected from previous experimental studies and modeled in ANSYS. Simulation results showed that Bacillus subtilis was the optimal bacterial type, and a 3% concentration of Bacillus subtilis can increase beam strength by 20.2%.
The results obtained, in the form of bacterial healing agent compositions and concrete mix designs, have been transferred for industrial implementation to leading design organizations Georeconstruction Design Institute LLC and PSK Venture LLC. The results are intended for use in the design, subsequent construction, and operation of buildings and structures made of monolithic reinforced concrete.
Organizational and infrastructural transformations:
A youth laboratory for protected and modular structures has been established on the basis of the laboratory.
In addition to the leading scientist G. Kordas, the laboratory staff includes two renowned specialists from India: M. Gunasekaran and S. Dixit.
Education and personnel retraining
- The laboratory's results were used to create a new Master's program, "Mechanics of Polymer and Composite Materials," with enrollment opening in 2023.
- In 2021-2022, student internships were conducted at the leading scientist's workplace.
- In 2021-2022, two scientific conferences titled "Self-Healing Structural Materials" were held.
- One doctoral dissertation has been prepared and defended.
Cooperation
Moscow State University of Civil Engineering (National Research University), Donbas National Academy of Civil Engineering and Architecture, Kazan State University of Architecture and Engineering (Russia), Tashkent Institute of Irrigation and Agricultural Mechanization Engineers (National Research University, Uzbekistan), Khaleel Dosmukhamedov Atyrau University (Kazakhstan): joint scientific conferences, student exchanges, internships for faculty and postgraduate students.In cooperation with Chinese universities, the representative office of Peter the Great St. Petersburg Polytechnic University in the PRC is utilized.
Website: https://www.spbstu.ru/structure/laboratoriya_samovosstanavlivayushchikhsya_konstruktsionnykh_materialov_2878/
Contact person: Sabri Mohanad Muayad Sabri, PhD in Engineering, Head of Laboratory
Address: 29 AF Politekhnicheskaya St., Technopolis (RIC), room B 3.20
Email: sabri_mm@spbstu.ru
Contact person: Sabri Mohanad Muayad Sabri, PhD in Engineering, Head of Laboratory
Address: 29 AF Politekhnicheskaya St., Technopolis (RIC), room B 3.20
Email: sabri_mm@spbstu.ru
Similar innovation and technology infrastructure facilities
