Bioactive Additives for Self-Healing of Concretete Microstructure

2019 ◽  
Vol 945 ◽  
pp. 36-41
Author(s):  
Michail Bruyako ◽  
L. Grigoryeva
Keyword(s):  
Continuous Monitoring ◽  
Building Materials ◽  
Setting Time ◽  
Construction Materials ◽  
Aerobic Bacteria ◽  
Self Healing ◽  
Bioactive Component ◽  
Biological Surface ◽  
Surface Active ◽  
Active Substances

As a result of the influence of the corrosive environment, the construction materials have a decrease in performance. To increase the service life of the structures, continuous monitoring and, if necessary, restorative repairs are carried out. One of the ways to maintain the initial properties for materials is to give them a self-healing effect by introducing a specially developed additive containing a bioactive component in the manufacturing process. The article presents the results of research on the ability of building materials based on mineral binders to self-repair. Mixtures containing nutrient medium for the biomass of aerobic bacteria were used as bioadditives. Portland cement and gypsum binder were used as mineral binders. The obtained results allow to make a conclusion about a significant change in the rheological properties of cement-sand mortars due to the presence of biological surface-active substances that are part of the cells of microorganisms. The effect of changing the concentration of cells on the setting time and on the strength characteristics of cement-sand mortars was established.

Increasing Efficiency of Waste Water Treatment of Wine-Making Enterprises with Simultaneous Production of Bio Surface for Oil Industry

2020 ◽  
Vol 24 (2) ◽  
pp. 41-45
Author(s):  
A.D. Burakaeva ◽  
G.V. Petrova ◽  
A.I. Khlytchiev ◽  
N.A. Akhalaia ◽  
S.V. Sorokun ◽  
...  
Keyword(s):  
Waste Water Treatment ◽  
Municipal Sewage ◽  
Microscopic Fungus ◽  
Simultaneous Production ◽  
Biological Surface ◽  
Surface Active ◽  
Pre Treatment ◽  
Water Cut ◽  
Rheological Indices ◽  
Active Substances

A method for pre-treatment of wastewater with the simultaneous production of biological surface-active substances (bio-surfactants) by deep cultivation of the microscopic fungus Hypomyces odoratus in the wastewater of a winery has been developed. In wastewater after cultivation of the fungus under aerobic conditions for 12 hours, a steady decrease in BOD was observed by 2.5 times, COD by 3 times, the content of suspended solids, sulfates, phosphates, ammonium ions, nitrates, nitrites, anionic surfactants decreased significantly substances (ACAS), cationic surfactants (CAS), wastewater in chemical composition began to approach the indicators of municipal sewage. The complexity of the composition obtained during the cultivation of the biomass fungus and the isolated exopolysaccharide contributed to a decrease in the surface tension of the oil and indicated that the fungus synthesizes the bio-surfactant complex. After contact with a 12-hour mass of fungus or exopolysaccharide obtained from biomass in highly viscous, water-flooded bituminized oil, an improvement in rheological indices was noted, and the water cut and content of paraffin deposits decreased.

scholarly journals Special Issue of Environment-Friendly Construction Materials

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1101 ◽  
Author(s):  
Shaopeng Wu ◽  
Inge Hoff ◽  
Serji Amirkhanian ◽  
Yue Xiao
Keyword(s):  
Building Materials ◽  
Asphalt Mixture ◽  
Construction Materials ◽  
Material Design ◽  
Self Healing ◽  
Special Issue ◽  
Environment Friendly ◽  
Pavement Materials ◽  
Recent Developments ◽  
Cold Recycling

This special issue, “Environment-Friendly Construction Materials”, has been proposed and organized as a means to present recent developments in the field of construction materials. For this reason, the articles highlighted in this editorial relate to different aspects of construction materials, from pavement materials to building materials, from material design to structural design, from self-healing to cold recycling, from asphalt mixture to cement concrete.

scholarly journals Self-Healing Construction Materials: The Geomimetic Approach

2021 ◽  
Vol 13 (16) ◽  
pp. 9033
Author(s):  
Valery Lesovik ◽  
Roman Fediuk ◽  
Mugahed Amran ◽  
Nikolai Vatin ◽  
Roman Timokhin
Keyword(s):  
Building Materials ◽  
Three Dimensional ◽  
Construction Materials ◽  
Evolutionary Stage ◽  
Self Healing ◽  
Building Science ◽  
Human Environment ◽  
Novel Technologies ◽  
Interdisciplinary Approaches ◽  
Wide Range

A person spends most of his life in rooms built from various building materials; therefore, the optimization of the human environment is an important and complex task that requires interdisciplinary approaches. Within the framework of the new theory of geomimetics in the building science of materials, the concepts of technogenic metasomatism, the affinity of microstructures, and the possibilities of creating composites that respond to operational loads and can self-heal defects have been created. The article aims to introduce the basic principles of the science of geomimetics in terms of the design and synthesis of building materials. The study’s novelty lies in the concept of technogenic metasomatism and the affinity of microstructures developed by the authors. Novel technologies have been proposed to produce a wide range of composite binders (including waterproof and frost-resistant gypsum binders) using novel forms of source materials with high free internal energy. The affinity microstructures for anisotropic materials have been formulated, which involves the design of multilayered composites and the repair of compounds at three levels (nano-, micro-, macro-). The proposed theory of technogenic metasomatism in the building science of materials represents an evolutionary stage for composites that are categorized by their adaptation to evolving circumstances in the operation of buildings and structures. Materials for three-dimensional additive technologies in construction are proposed, and examples of these can be found in nature. Different ways of applying our concept for the design of building materials in future works are proposed.

scholarly journals Bacterial Concrete as a Sustainable Building Material?

2020 ◽  
Vol 12 (2) ◽  
pp. 696 ◽  
Author(s):  
Elżbieta Stanaszek-Tomal
Keyword(s):  
Building Materials ◽  
Construction Materials ◽  
High Energy ◽  
Production Costs ◽  
Sustainable Construction ◽  
Industrial Scale ◽  
Self Healing ◽  
Effective Response ◽  
The Right ◽  
Bacterial Concrete

The right selection of building materials plays an important role when designing a building to fall within the definition of sustainable development. One of the most commonly used construction materials is concrete. Its production causes a high energy burden on the environment. Concrete is susceptible to external factors. As a result, cracks occur in the material. Achieving its durability along with the assumptions of sustainable construction means there is a need to use an environmentally friendly and effective technique of alternative crack removal in the damaged material. Bacterial self-healing concrete reduces costs in terms of detection of damage and maintenance of concrete structures, thus ensuring a safe lifetime of the structure. Bacterial concrete can improve its durability. However, it is not currently used on an industrial scale. The high cost of the substrates used means that they are not used on an industrial scale. Many research units try to reduce production costs through various methods; however, bacterial concrete can be an effective response to sustainability.

scholarly journals CHANGES OF CONSTRUCTION MATERIAL PROPERTIES WITH ADDITION OF BACTERIAL CELL BIOMASS POSSESSING UREASE ACTIVITY INTO THE MATERIALS

Vestnik MGSU ◽  
2017 ◽  
pp. 788-796
Author(s):  
Nikolay Alekseevich Stepanov ◽  
Elena Nikolaevna Efremenko ◽  
Mikhail Gerasimovich Bruyako ◽  
Aleksandra Igorevna Grigoreva
Keyword(s):  
Bacterial Cell ◽  
Urease Activity ◽  
Construction Material ◽  
Setting Time ◽  
Construction Materials ◽  
Bacterial Biomass ◽  
Bacterial Cells ◽  
Self Healing ◽  
Cell Biomass ◽  
Artificial Materials

Results of research that aimed on appearance of self-healing ability between characteristics of construction materials and products, based on mineral binding substances, via bioprocesses of selective action, resulting from the introduction of bacterial biomass into the composition of mortar and consruction cement mixes were shown in the article. The article contains the results of revealing the most active forms of biological material adapted to the conditions of formation of building products based on mineral binders and results of investigating their effect on the rheological, technological and operational properties of mortars that are modified. Portland cement and gypsum binder were used as mineral binders to produce solution mixtures with different pH values. Efficiency of bacterial cell action was determined via estimation of cell urease activity. The variations of values of water-cement ratio appeared to be pronounced in dependence on: concentrations of introduced cell biomass content; changes in the urease activity of the bacterial cells, varied with the values of pH of used medium; the use of both highly porous natural and artificial materials as microcontainer carriers. The obtained results make it possible to conclude about significant change in the rheological properties of cement-sand mortars owing to the presence of biological surfactants entering into a content of bacterial cells. The influence of cells concentration on a setting time and strength characteristics of cement-sand mortars was determined.

scholarly journals A Review of How the Characteristics of Concrete is Altered when Fly Ash is used as a Partial Replacement for Cement

2021 ◽  
Vol 5 (2) ◽  
pp. 72-80
Author(s):  
Heba Adnan
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
Building Materials ◽  
Low Cost ◽  
Setting Time ◽  
Construction Materials ◽  
Partial Replacement ◽  
Cement Manufacturing

Cement is one of the most widely used building materials on the planet. Cement manufacturing has also increased carbon emissions to their greatest level in recent years. Alternative or low-emissions binders have become more popular as a partial cement substitute in recent years. Because of its huge yearly output as waste material and low cost, fly ash is now regarded as one of the most accessible choices. Fly ash-based construction materials have a lot of promise as cement substitutes because of their high performance and inexpensive cost. The purpose of this article is to look at how fly ash affects the workability, setting time, compressive strength, and tensile strength of concrete. The kinds and characteristics of fly ash were also investigated.

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