The estimation of the cost design of bacteria-based self-healing concrete (original) (raw)
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BIO CONCRETE AND BACTERIA BASED SELF HEALING CONCRETE
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An Experimental Study on Strength and Self-Healing Characteristics of Bacterial Concrete
International Journal of Innovative Research in Engineering and Management (IJIREM), 2024
In modern era, concrete is widely used in building materials. Concrete is durable, strong, and locally available. It has a property of resisting the compressive load to a limit but if the load applied goes beyond the limit, the strength of concrete is reduced because of the development of the cracks in the concrete. Thus the treatment for these cracks becomes very expensive. The development of cracks in concrete affects the serviceability limit of concrete. The influx of water and harmful chemicals into the concrete may decrease both the strength and life. Structural failure may be caused by micro-cracks. One way to avoid costly manual maintenance and repair is to include an autonomies self-healing mechanism in concrete. One such an alternative mechanism is correctly being studied i.e. a novel technique based on the application of bio-mineralization of bacteria in concrete. The applicability of specifically calcite mineral precipitating bacteria for concrete repair and plugging of pores and cracks in concrete has been investigated and studies on the possibility of using specific bacteria as a sustainable and concrete embedded self-healing agent was studied and results from ongoing studies are discussed. Synthetic polymers such as epoxy treatment etc. are now a days used for repair of concrete are harmful to the environment, hence the biological repair technique is focused. Recently, it has been found that microbial carbonate Precipitation resulting from the metabolic activities of micro-organisms in concrete modified the overall behavior of concrete. Hence, in this paper, we explain the bacterial concrete, its classification and types of bacteria, chemical processes to fix the micro cracks, advantages ,disadvantages and the possibilities on application of micro-organisms in the concrete. The different strengths of normal concrete and concrete with bacillus were analyzed and the tests were conducted and compared.
Improvement Properties of Self -Healing Concrete by Using Bacteria
2019
The aim of this investigation, self-healing of cracks in concrete by using named Bacillus Subtilis bacteria isolated from agricultural soils and dry soil. Four concrete mixes include, one plain mix without bacteria, other mixes containing a different concentrations of bacteria 10 3 , 10 6 and 10 9 cell/ml respectively were prepared. Hardened properties of concrete water absorption, ultrasonic plus velocity, and compressive strength at 7, 28, 60 and 90 days. Also concrete specimens applied to load 10% of compressive strength at 28 days were studied. The result indicate there is decrease in water absorption of (15-38)%, as well as the decrease in the concrete specimens of loading 10% of compressive strength of (23-41%) relative to control concrete. Increase in compressive resistance of concretes specimens of (6-20)%, (6-17)%, (8-22)% and (7-20)% for ages 7, 28, 60 and 90 days respectively, concrete specimens loaded by 10% of compressive strength, increased by (25-34%) and (34-39%) for 60 and 90 days relative to control concrete. It was observed that the UPV test of concrete specimens was increased. Scanning Electron Micrographic gave an increased in density, deposition of calcite carbonates in the voids and closure of the crack by precipitation of calcium carbonate layers was observed.
SELF-HEALING MATERIAL BACTERIAL CONCRETE
The requirement of high durability for structures exposed to harsh environment such as seafloor, offshore, tunnels, highways, bridges, sewage pipes and structures for solid, liquid wastes containing toxic chemicals and radioactive elements may not be achieved using today's ordinary portland cement (OPC). This research gives information about the aims at increasing the strength and the total durability of the concrete used in the present day by introducing bacteria (Bacillus pasteurii). This micro organism is a soil bacterium. Bacillus pasteurii exhibits a phenomenon known as bio-calcification as a part of its metabolic activity. Bio-calcification is a process through which the micro-organsim externally secretes calcium precipitate, which in the presence of a carbonate ion forms CaCO 3 which fills up the voids in the concrete texture thus making it more compact. This inturn improves the strength in concrete due to growth of the filler material within the pores of the concrete mixer. A comparison study was made with concrete cubes and beams subjected to compressive and flexural strength tests with and without the bacterium. It was found that there was high increase in strength and healing of cracks subjected to loading on the concrete specimens.
EXPERIMENTAL INVESTIGATION ON SELF-HEALING BACTERIAL CONCRETE
The service life of the structure have reduced in today's construction field due to the low durability, strength factors and various other properties of concrete structures exposed to the environment. A novel strategy to restore or remediate cracks formed in the structures is bio-mineralization of Calcium Carbonate using microbes such as Bacillus. This research gives the information about increasing the durability of the concrete structure by introducing bacterial cell and other required nutrients for the process of bio-calcification where the microorganisms secrete Calcium Precipitate which in the presence of Carbonate ion forms Calcium Carbonate(Calcite) layer thus self-healing the cracks. Thus the durability of the concrete structure will increase and a study has to be carried out with concrete cubes subjected to bacterium.
Strength Improvement Studies on Self-Healing Characteristics of Bacterial Concrete (Review Paper)
The application of concrete is rapidly increasing worldwide and therefore the development of sustainable concrete is urgently needed for environmental reasons. As present, about 7% of the total atmospheric carbon-dioxide (CO ) emission is due to cement production and its mechanisms that would contribute to a longer service life of concrete structures and it makes the material not only more durable but also sustainable. Cracks are common failures in concrete. Cracks may develop due to addition of excess of water during mixing of concrete, or may be due to shrinkage or creep. In this paper, the following notable points regarding development of a two component self-healing system, characterization studies done with different bacterial species, variation in compressive strength of concrete upon bacterial cell concentrations, physical properties of self-healing concrete, potential of bacteria to act as a self-healing agent etc., are observed and identified from the other research works. A specific group of alkali-resistant spore forming bacteria preferably of genus Bacillus are selected and added to concrete or mortar paste for development of self-healing capacity in structures.
International Conference on Innovative Trends in Civil Engineering for Sustainable Development (ITCSD - 2019), 2019
Concrete is a commonly used construction material and various researches are carried out for the production of more durable and eco-friendly concrete. Concrete is good in resisting compressive forces but weak in tension which leads to the formation of cracks. These cracks further increases with time and deteriorates the structure. The maintenance of which also requires costly improvement techniques with long period of time. Therefore, Bio-concrete has recently developed which is eco-friendly and a promising improvement technique for concrete characteristics. The bacteria which produces carbonate have the potential to heal the cracks without human intervention. In addition to this, these bacteria has also shown improvement on compressive strength of concrete. Therefore, it becomes important to study the characteristics of bio-concrete over the normal conventional concrete. The objective of this work is to compare the compressive and flexural strength of both types of concrete and verify the self-healing property of the bio-concrete. Various samples of concrete cubes are formed with varying the amount of bacterial solution. These cubes are then tested in laboratory for slump test, compressive strength and flexural test. Scanning Electron Microscopy is done for verification of involvement of bacteria in healing of the cracks. The findings of this project shows that bio-concrete is more durable than the conventional concrete and bacteria present in concrete senses the crack and react to fill with biologically produce limestone.
Improvising Self Healing Abilities and Properties of Concrete using Bacteria: A Review
2022
Concrete is a fundamental construction material which is one of the main reasons for an structure to survive for a long duration of time. The binding ability , its high compressibility and strength retaining capability makes it more durable. But, there are some factors which can harness the durability of the concrete with respect to time and can reduce the longevity or the age of the structure such as chloride attack, sulphate attack, freezing, thawing etc. This result in degradation of structure and formation of cracks. These cracks plays a vital role in tempering the durability of structure providing a clean passage to water to seep in deep to the reinforcement and here the problems arises. So, some bacteria which can react with water and can form precipitates in powdered form are injected during the baching process.This process is termed as Self healing of concrete. These bacteria can also play a pivotal role in altering the concrete properties. So in this review we are going to ...
IRJET- EXPERIMENTAL STUDY ON SELF-HEALING CHARACTERISTICS OF BACTERIAL CONCRETE
IRJET, 2020
Concrete is a major part of construction material in the world. The major drawback of the material easily cracks due to low tensile strength. Concrete is a combination of cement, fine aggregate, coarse aggregate and water considered as a homogenous material. New technologies have helped to develop new type of construction material in concrete. In this project experimental investigation were carried out to evaluate the influence of bacillus subtilis on compressive strength, split tensile strength, water absorption and self-healing properties. And it is made to heal the crack by the addition of the bacteria in the concrete also increase the strength. Three different concentration were added. Test were performed at the ages of 7, 14 & 28 days. Since the crack formation is major threat for the concrete structures this will study will help to overcome those catastrophic situations. Hence by using this innovative technique of cracking healing in the concrete structures the strength and durability will be increased compared to the conventional concrete. An MICCP (Microbiologically Induced Calcium Carbonate Precipitation) it is an eco-friendly method to enhance the concrete. Investigation on the strength assessment of the bacteria based self-healing concrete by find out optimum dosage of bacteria content to be added maximum strength and also reduce the crack width in concrete structures.
Efficacy of Bacterial Concrete with Conventional Concrete
International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2022
Concrete is one of the maximum used building substances. But, it is one of the predominant manufacturers of carbon dioxide (CO2) that's immediately contributing to destroying our surroundings. Not to say that significant costs are being spent each year to keep concrete structures. Cracks of numerous sizes shape in all concrete structures which need to be sealed manually shortening the life of a particular construction. However, Self-healing concrete (SHC) is a innovative constructing material that has the answer to these kind of troubles and is the constructing fabric of the near destiny. Therefore, we want to apprehend its homes and mechanism and foresee how it impacts the architectural designs of the time to come back, and which standers are had to create useful and aesthetic homes and buildings. It's been proven that a number of the present day concrete remedy strategies together with the software of chemical substances and polymers are a supply of fitness and environmental dangers, and greater importantly, they are powerful best within the quick term. As a result, treatment techniques which are environmentally pleasant and lengthy-lasting are in high call for. A microbial self-restoration method is distinguished by way of its capacity for long-lasting, fast, and lively crack restore, even as also being environmentally pleasant.