In concrete, cracking is a common phenomenon due to its relatively low tensile strength , which... more In concrete, cracking is a common phenomenon due to its relatively low tensile strength , which occurs due to external loads and imposed deformations. The main research objective is to create a kind of self-healing concrete by employing mineral producing bacteria Bacillus pasteurii to locate the rift in the most favourable circumstances for autogenous healing to take place. Self-healing concrete containing bacteria has been generated for this study through the application of bacterial self-healing elements as spores and nutrients with different percentages of bacteria ranging from (10% - 25%) as a replacement of mixing water is added at the time of pouring. The bacteria influence was observed by Scanning Electron Microscope (SEM) and with Energy Dispersive X-ray Spectrometer. The mechanical properties and durability of a thirty-five mixture were examined. The optimal blending content proportion was 10SF20BC, which showed an increment in compressive strength and flexural st...
Concrete that contains self-healing supplementary materials is a feature of many sustainable stru... more Concrete that contains self-healing supplementary materials is a feature of many sustainable structuresbecause it decreases maintenance costs and extends service life. Conventional concretes exposed to cracking during tension that is problem. The cracks on the concrete surfaceallow the liquids to pierce inside causing collapse of the structures of concrete. Because of the cost, the challenges and time consumingof concrete structures’renovation and restoration, self-healing concrete solves the problem by healing this cracks on the surface. This concrete is characterized asfriend -environment and controlling the inner part of cracks by releasing the calcium carbonate. This paper aims to reveal the healing ratio of crack by using biological factors to improve the concrete nature. The mechanical and durability tests are used to calculate the ratioof concretes’ self-healing. The study showsthat bio concrete blends after curing it for twenty eight days achieved improvement in compressive ...
Concrete that contains self-healing supplementary materials is a feature of many sustainable stru... more Concrete that contains self-healing supplementary materials is a feature of many sustainable structuresbecause it decreases maintenance costs and extends service life. Conventional concretes exposed to cracking during tension that is problem. The cracks on the concrete surfaceallow the liquids to pierce inside causing collapse of the structures of concrete. Because of the cost, the challenges and time consumingof concrete structures'renovation and restoration, self-healing concrete solves the problem by healing this cracks on the surface. This concrete is characterized asfriend -environment and controlling the inner part of cracks by releasing the calcium carbonate. This paper aims to reveal the healing ratio of crack by using biological factors to improve the concrete nature. The mechanical and durability tests are used to calculate the ratioof concretes' self-healing. The study showsthat bio concrete blends after curing it for twenty eight days achieved improvement in compressive strength, permeability resistance and flexural strength compared to conventional concrete. The precipitations effectiveness formed at the crack surface of the cement paste specimens were studied by Scanning Electron Microscope (SEM), and with Energy Dispersive X-ray Spectrometer (EDS), attached to it. In this study the self-healing concrete abled to fill crack with widths lead to 0.80 mm. The study above showed that specific conditions were needed to obtain self-healing agent.
In concrete, cracking is a common phenomenon due to its relatively low tensile strength , which... more In concrete, cracking is a common phenomenon due to its relatively low tensile strength , which occurs due to external loads and imposed deformations. The main research objective is to create a kind of self-healing concrete by employing mineral producing bacteria Bacillus pasteurii to locate the rift in the most favourable circumstances for autogenous healing to take place. Self-healing concrete containing bacteria has been generated for this study through the application of bacterial self-healing elements as spores and nutrients with different percentages of bacteria ranging from (10% - 25%) as a replacement of mixing water is added at the time of pouring. The bacteria influence was observed by Scanning Electron Microscope (SEM) and with Energy Dispersive X-ray Spectrometer. The mechanical properties and durability of a thirty-five mixture were examined. The optimal blending content proportion was 10SF20BC, which showed an increment in compressive strength and flexural st...
Concrete that contains self-healing supplementary materials is a feature of many sustainable stru... more Concrete that contains self-healing supplementary materials is a feature of many sustainable structuresbecause it decreases maintenance costs and extends service life. Conventional concretes exposed to cracking during tension that is problem. The cracks on the concrete surfaceallow the liquids to pierce inside causing collapse of the structures of concrete. Because of the cost, the challenges and time consumingof concrete structures’renovation and restoration, self-healing concrete solves the problem by healing this cracks on the surface. This concrete is characterized asfriend -environment and controlling the inner part of cracks by releasing the calcium carbonate. This paper aims to reveal the healing ratio of crack by using biological factors to improve the concrete nature. The mechanical and durability tests are used to calculate the ratioof concretes’ self-healing. The study showsthat bio concrete blends after curing it for twenty eight days achieved improvement in compressive ...
Concrete that contains self-healing supplementary materials is a feature of many sustainable stru... more Concrete that contains self-healing supplementary materials is a feature of many sustainable structuresbecause it decreases maintenance costs and extends service life. Conventional concretes exposed to cracking during tension that is problem. The cracks on the concrete surfaceallow the liquids to pierce inside causing collapse of the structures of concrete. Because of the cost, the challenges and time consumingof concrete structures'renovation and restoration, self-healing concrete solves the problem by healing this cracks on the surface. This concrete is characterized asfriend -environment and controlling the inner part of cracks by releasing the calcium carbonate. This paper aims to reveal the healing ratio of crack by using biological factors to improve the concrete nature. The mechanical and durability tests are used to calculate the ratioof concretes' self-healing. The study showsthat bio concrete blends after curing it for twenty eight days achieved improvement in compressive strength, permeability resistance and flexural strength compared to conventional concrete. The precipitations effectiveness formed at the crack surface of the cement paste specimens were studied by Scanning Electron Microscope (SEM), and with Energy Dispersive X-ray Spectrometer (EDS), attached to it. In this study the self-healing concrete abled to fill crack with widths lead to 0.80 mm. The study above showed that specific conditions were needed to obtain self-healing agent.
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Papers by Gehad Ahmed