scholarly journals Bacterial Concrete- A Sustainable Solution for Concrete Maintenance

2019 ◽  
Vol 8 (11S) ◽  
pp. 227-232 ◽  
Keyword(s):  
Concrete Slab ◽  
Research Work ◽  
Construction Materials ◽  
Self Healing ◽  
Conventional Concrete ◽  
Sealing Capacity ◽  
Sustainable Materials ◽  
Positive Results ◽  
Bacterial Concrete

Cracks formed in concrete are inescapable and are one of the major reasons for the weaknesses of concrete. Majorly water along with other components penetrate through these cracks resulting in corrosion thereby reducing the strength of concrete directly hampering its life. The objective of present research work is to promote sustainable development and to identify sustainable materials for treating cracks formed in concrete. Various researches have shown positive results by adding calcite precipitating bacteria in concrete, also known as bacterial concrete or self-healing concrete. This research is dedicated to check the suitability of mixing these self-healing calcite depositing bacteria with concrete in order to increase the compressive strength of concrete, reduce its permeability and seepage of water by bio-mineralization process. Substantial increase in strength is observed in concrete specimens when casted with bacterial solution. The study has devised methods or ways to test the effect of use of bacteria in concrete. Tests on concrete slab with various combinations of bacterial solution as well as varied percentage of bacterial solution have been conducted. Use of bacterial solution for surface application on slab to test the sealing capacity is done. Results have been compared with conventional concrete. Biological modifications of construction materials are the need of the hour for strength improvement and long term sustainability. The present study proposes a promising sustainable repair method for concrete.

Mechanical and Microstructure Study of the Self Healing Bacterial Concrete

2019 ◽  
Vol 969 ◽  
pp. 472-477
Author(s):  
Sachin Tiwari ◽  
Shilpa Pal ◽  
Rekha Puria ◽  
Vikrant Nain ◽  
Rajendra Prasad Pathak
Keyword(s):  
Compressive Strength ◽  
Bacillus Megaterium ◽  
Construction Material ◽  
Research Work ◽  
Bacillus Sphaericus ◽  
Maximum Amount ◽  
The Self ◽  
Self Healing ◽  
Scanning Electron ◽  
Bacterial Concrete

Concrete largely used for construction material, degrades with the development of cracks that becomes easy passage for entry of chemicals and harmful compounds. Self healing capability is helpful to mitigate the deterioration of the concrete structures. This research work focuses on the self healing behaviour and mechanical properties of the bioconcrete supplemented with three different bacteria namely Bacillus sphaericus, Bacillus cohnii and Bacillus megaterium. Concrete supplemented with Bacillus cohnii exhibited 35.31% increase in compressive strength compared to control mix after 28 days. Concrete supplemented with other bacteria Bacillus sphaericus and Bacillus megaterium also showed enhanced compressive strength. Interestingly, addition of bacteria aided in healing of artificially generated cracks by formation of CaCO3 minerals. Maximum amount of healing (bacterial precipitation) which could be quantified as calcite minerals present in the bacterial concrete was 11.44% with B. cohnii confirmed by the Scanning Electron Microscope (SEM) with Energy Dispersive Spectroscopy (EDS).

scholarly journals Review on Performance Evaluation of Autonomous Healing of Geopolymer Composites

2021 ◽  
Vol 6 (7) ◽  
pp. 94
Author(s):  
Salmabanu Luhar ◽  
Ismail Luhar ◽  
Faiz Uddin Ahmed Shaikh
Keyword(s):  
Healing Process ◽  
Construction Materials ◽  
Geopolymer Concrete ◽  
Self Healing ◽  
Concrete Technology ◽  
Internal Factors ◽  
Microbial Carbonate ◽  
Precipitation Medium ◽  
Pass Through

It is a universal fact that concrete is one of the most employed construction materials and hence its exigency is booming at a rocket pace, which in turn, has resulted in a titanic demand of ordinary Portland cement. Regrettably, the production of this essential binder of concrete is not merely found to consume restricted natural resources but also found to be associated with emission of carbon dioxide—a primary greenhouse gas (GHG) which is directly answerable to earth heating, resulting in the gigantic dilemma of global warming. Nowadays, in order to address all these impasses, researchers are attracted to innovative Geopolymer concrete technology. However, crack development of various sizes within the concrete is inevitable irrespective of its kind, mix design, etc., owing to external and internal factors viz., over-loading, exposure to severe environments, shrinkage, or error in design, etc., which need to be sealed otherwise these openings permits CO2, water, fluids, chemicals, harmful gases, etc., to pass through reducing service life and ultimately causing the failure of concrete structures in the long term. That is why instant repairs of these cracks are essential, but manual mends are time-consuming and costly too. Hence, self-healing of cracks is desirable to ease their maintenances and repairs. Self-healing geopolymer concrete (SHGPC) is a revolutionary product extending the solution to all these predicaments. The present manuscript investigates the self-healing ability of geopolymer paste, geopolymer mortar, and geopolymer concrete—a slag-based fiber-reinforced and a variety of other composites that endow with multifunction have also been compared, keeping the constant ratio of water to the binder. Additionally, the feasibility of bacteria in a metakaolin-based geopolymer concrete for self-healing the cracks employing Bacteria-Sporosarcina pasteurii, producing Microbial Carbonate Precipitations (MCP), was taken into account with leakage and the healing process in a precipitation medium. Several self-healing mechanisms, assistances, applications, and challenges of every strategy are accentuated, compared with their impacts as a practicable solution of autogenously-healing mechanisms while active concretes are subjected to deterioration, corrosion, cracking, and degradation have also been reviewed systematically.

scholarly journals Concrete Canvas: A Multifaceted Construction Material

2019 ◽  
Vol 8 (3) ◽  
pp. 1898-1901
Keyword(s):  
Construction Material ◽  
Construction Materials ◽  
Self Healing ◽  
Construction Sector ◽  
Low Carbon ◽  
Revolutionary Change ◽  
Conventional Concrete ◽  
Concrete Layer ◽  
Healing Property ◽  
Water Proofing

Cement concrete is a most used construction material, due to its enormous demand worldwide in the construction sector. Concrete serves many purposes in different adverse conditions, there are many advantages but there is one limitation that is concrete is not flexible. Concrete Canvas brought a revolutionary change in the construction materials called Geosynthetic Cementitious Composite Mats (GCCMs) which as many applications and used as an alternative to conventional concrete. It is a flexible, concrete canvas that gets hardens on hydration to form a thin, durable, waterproof and low-carbon concrete layer. Concrete Canvas may find its tremendous scope in the Construction sector as fire resistance and water proofing material. The concrete canvas has a self healing property thereby adds good benefit to the life of material and economically because of its zero percent repairs maintenance. Even though if the concrete canvas gets damaged after a period of time, it gets self healed with the contact of water which helps in the hydration process. This paper mainly focuses on the case study done on the applicability of concrete canvas for fire resistant, Water proof and bulletproofing with the help of AP State Police and to explore different applications in Construction sector as well as Defense sector.

Atmosphere Aggressivity State Mapping in Slovak Republic for Corrosion of Construction Materials

2014 ◽  
Vol 811 ◽  
pp. 49-56
Author(s):  
Ján Kozák ◽  
Martina Ivašková ◽  
Peter Koteš
Keyword(s):  
Response Function ◽  
Dose Response ◽  
Slovak Republic ◽  
Research Work ◽  
Construction Materials ◽  
The Other ◽  
Maintenance Costs ◽  
Considerable Impact ◽  
Dose Response Function

The paper is focused on the effect of multi-pollution of atmosphere on the construction degradation in the Slovak Republic. Corrosion increases the risk of failure, which has considerable impact on maintenance costs. The objective of the article is a creation of the proposal that should be used for processing of the corrosion maps for the various construction materials. It uses dose-response function that was developed based on long-term research. The corrosion map does not help to protect materials; however it can be useful for prediction of risks by design and analysis. The research done by the other researchers is taken into account also in our work. The results would be used as a basis for the beginning of a long-term research work.

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.

Determination of Bacterial Concrete Strength Using Bacillus Subtilis and Lightweight Expandable Clay Aggregate

2021 ◽  
Vol 5 (2) ◽  
pp. 351-362
Author(s):  
Dhiraj Ahiwale ◽  
Rushikesh Khartode
Keyword(s):  
Bacillus Subtilis ◽  
Concrete Strength ◽  
Calcium Lactate ◽  
Self Healing ◽  
Conventional Concrete ◽  
Substantial Impact ◽  
Bacterial Form ◽  
Experimental Findings ◽  
The Impact ◽  
Bacterial Concrete

This study examines the impact of bacterial concrete on strength and self-healing. Bacterial concrete has better compressive strength, permeability, corrosion resistance, chemical precursors, alkalinity resistance, and mechanical stress. Bacillus subtilis calcium lactate and spore powder effects are explored in this study, and the influence of this bacterial form on strength and self-healing capacity to crack repair. The Bacillus subtilis concentration 105 cells/mL is used in concrete with calcium lactate 0.3% of cement. In another trial, calcium lactates 0.3% and spore powder 0.5% of cement with Bacillus subtilis concentration of 105 cells/mL and lightweight expandable clay aggregate (LECA) is 30% replaced to the coarse aggregate used in concrete respectively. The conventional concrete and bacterial concrete cubes were molded with dimensions of 150 mm x 150 mm x 150 mm, cylinders with dimensions of 100 mm x 200 mm, and a beam with dimensions of 100 mm x 100 mm x 500 mm. These specimens were evaluated after 7 and 28 days of cure. The compressive, split tensile, and flexural strength of bacterial concrete was raised by 23%, 8%, and 7%, respectively when compared to conventional concrete. Thus, the experimental findings reveal that Bacillus subtilis at 105 cells/ml cells with 0.3% calcium lactate has a substantial impact on the strength and self-healing of bacterial concrete.

Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel

2018 ◽  
Vol 15 (1) ◽  
pp. 15
Author(s):  
AMIR SYAFIQ SAMSUDIN ◽  
MOHD HISBANY MOHD HASHIM ◽  
SITI HAWA HAMZAH ◽  
AFIDAH ABU BAKAR
Keyword(s):  
Reinforced Concrete ◽  
Bending Strength ◽  
Steel Fibre ◽  
Concrete Slab ◽  
Future Application ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Conventional Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Bending Load

Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction of ribbed slab reduces concrete materials and thus the cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab was tested under three-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. This research shows that SFRC Ribbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

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