Papers by Dr. Ramin Andalib
The existent research investigates the ability of Bacillus bacteria species to improve the streng... more The existent research investigates the ability of Bacillus bacteria species to improve the strength of Geo-polymer concrete based on bio-mineralization mechanism. The appropriate cell concentration of bacteria was introduced in ordinary and Geo-polymer concrete by way of the mixing water to compare their strength and durability. In this research, it was found that the compressive strength growth in Geo-polymer bacterial concrete was the highest in comparison to ordinary bacterial concrete at 90 th day. For durability study, the specimens were immersed in 5% H2SO4 solution and the result showed that Geo-polymer bacterial concrete had the least weight and strength losses than ordinary bacterial concrete at different ages. This improvement was due to the temperature condition of Geo-polymer bacterial concrete to survive more bacteria for purpose of calcite precipitation. The density and uniformity of concrete were also examined by ultrasonic pulse velocity (UPV) test. The result showed...
Five different cell concentrations of Bacillus megaterium (10 Â 10 5 to 50 Â 10 5 cfu/ml) were in... more Five different cell concentrations of Bacillus megaterium (10 Â 10 5 to 50 Â 10 5 cfu/ml) were introduced in structural concrete to achieve the optimum concentration of bacteria. The significant increase in the strength was obtained in the case of 30 Â 10 5 cfu/ml at different ages. The strength of highest grade of bacterial concrete had improved (24%) as compared to lowest grade (12.8%) due to calcification mechanism. Microbial calcite precipitation was quantified using X-ray diffraction analysis, visualized by scanning electron microscopy and analyzed by energy dispersive spectrometer. It was found that the optimum concentration of B. megaterium had a positive effect on high strength structural concrete.
Construction and Building Materials, 2016
Five different cell concentrations of Bacillus megaterium (10 × 105 to 50 × 105 cfu/ml) were intr... more Five different cell concentrations of Bacillus megaterium (10 × 105 to 50 × 105 cfu/ml) were introduced in structural concrete to achieve the optimum concentration of bacteria. The significant increase in the strength was obtained in the case of 30 × 105 cfu/ml at different ages. The strength of highest grade of bacterial concrete had improved (24%) as compared to lowest grade (12.8%) due to calcification mechanism. Microbial calcite precipitation was quantified using X-ray diffraction analysis, visualized by scanning electron microscopy and analyzed by energy dispersive spectrometer. It was found that the optimum concentration of B. megaterium had a positive effect on high strength structural concrete.
Desalination and Water Treatment, 2013
Self-healing concrete has beenwidely recognized as remedial technique to improve the durability o... more Self-healing concrete has beenwidely recognized as remedial technique to improve the durability of concrete.Some review papers have been published on self-healing concrete. Yet thehierarchical structure foritsclassificationneeds to be reviewed. This study presents a novel taxonomy making use of advances inknowledgefor self-healing concrete. The study addresses the general taxonomy of self-healing concrete to beclassified into three categories i.e., natural, chemical and biological processes. The focus is on the study ofthe biological processes.The review and taxonomy presents a new insight into the research on treatment ofunexpected cracking of concrete. The information presented in this paper is significant for biotechnologistsand bioprocess engineers to have comprehensive updates on the current status-quo ofself-healing concrete.
Self-healing concrete has beenwidely recognized as remedial technique to improve the durability o... more Self-healing concrete has beenwidely recognized as remedial technique to improve the durability of concrete.Some review papers have been published on self-healing concrete. Yet thehierarchical structure foritsclassificationneeds to be reviewed. This study presents a novel taxonomy making use of advances inknowledgefor self-healing concrete. The study addresses the general taxonomy of self-healing concrete to beclassified into three categories i.e., natural, chemical and biological processes. The focus is on the study ofthe biological processes.The review and taxonomy presents a new insight into the research on treatment ofunexpected cracking of concrete. The information presented in this paper is significant for biotechnologistsand bioprocess engineers to have comprehensive updates on the current status-quo ofself-healing concrete.
Concrete is a porous material and its porosity is accompanied by ingress of aggressive agents to ... more Concrete is a porous material and its porosity is accompanied by ingress of aggressive agents to decrease its strength and durability. Natural ingredient with filling capacity can be added to concrete to improve its characteristics. There are some natural waste materials which are known as good materials for partial replacement of ordinary Portland cement in the production of concrete. Construction problems and mix design complexity using these waste materials are the reasonable evidences for a need for another type of concrete. In recent times, the application of microorganism in cementations materials has received a lot of interest. One significant area of interest is bacterial concrete. The concept is to introduce bacteria in concrete, which will aid in mineral precipitation of pores and tiny cavity areas. Bacillus is a type of bacteria that can produce as a binding filler material to enhance concrete characteristics. This study provided an insight of a new biotechnological metho...
EngRN: Materials Selection, 2014
Self-healing concretes are being widely recognized as a remedial technique to improve the durabil... more Self-healing concretes are being widely recognized as a remedial technique to improve the durability o f concrete. Although, few review papers on self-healing concret e were published, a strong review on all aspects of self-healing concrete cannot be found. In this paper, natural, chemical a nd biological processes of self-healing concrete te chnologies were completely reviewed. The main focus of the study is for the biological processes. The review presents a new insight into the research for the treatment of unexpected cracking o f concrete. The information presented in this paper can be considered significant for biotechnologists and bioprocess eng ineers to have comprehensive updates on the current status-quo of self- healing concrete.
Biological self-healing concrete is a new idea to ha ve concrete structures with more durability.... more Biological self-healing concrete is a new idea to ha ve concrete structures with more durability. Althou gh, several papers have been published on biological self-healing conc rete, a suitable instruction to conduct this type o f studies is not reported. Aim of this paper is collecting comprehensive infor mation about conducting a study on self-healing con cretes based on previous studies. This paper present many new ideas that have not been completely study. Some idea suc h as application of fungi, thermopiles bacteria, mix culture of microor ganisms or using of aerobic or anaerobic bacteria t o design biological selfhealing concrete are suggested in this paper. Ideas of this paper can help researchers to find a suita ble and novel subject in biological self-healing area to conduct a strong re search.
This study is an attempt to highlight the use of Pa lm Oil Fuel Ash (POFA) with Fly Ash, instead ... more This study is an attempt to highlight the use of Pa lm Oil Fuel Ash (POFA) with Fly Ash, instead of cement, in reinforced concrete beams. POFA, a waste from Palm oil mill and Fly Ash, a waste from coal-burning power stations which are cheap and available. It is expected that millions tonnes of p alm oil waste will be produced annually and a lot o f money will be spent to transport and maintenance the waste. Environment is also being destroyed by the emission of CO 2 in Portland cement industries (global warming).Hence, it has become necessary that the study efforts in using of Geo-polymer concret e gain greater attention. In this study, laboratory tests were carried out to determine flexural strength, deflection and crack pattern for three kinds of materials that were used in reinforced concrete bea ms [ POFA-Fly Ash Geo-polymer concrete, Fly Ash Geo-polymer concrete and OPC (Ordinary Portland Cement ) concrete ]. The experimental result showed that the behaviour of reinforced POFA-...
Desalination and Water Treatment, 2013
ABSTRACT This study investigated two indigenous micro-organisms that can be isolated from soil. T... more ABSTRACT This study investigated two indigenous micro-organisms that can be isolated from soil. The isolated micro-organisms could precipitate calcium carbonate. These micro-organisms were applied to design self-healing concretes. Concrete is one of the most important materials which is used to build structures. Strength and durability of concrete is very important. Hence, a lot of research in this field is being conducted. Although a few reports can be found on the use of different micro-organism to design self-healing concretes, no research has been carried out to isolate suitable indigenous micro-organisms in Malaysia. In this study two strains of microorganisms were isolated from soil. Broken concrete was treated by a medium culture (MC) containing micro-organisms. Results of this study showed that, cracked concrete could be filled by calcium carbonate after treating by a MC containing micro-organisms. However, this treatment is not very effective on the strength of concrete. Results of this study can be used to have a better grasp of biological self-healing concrete, it is extremely important to have cheap and durable materials to build concrete structures in future.
Five different cell concentrations of Bacillus megaterium (10 × 105 to 50 × 105 cfu/ml) were intr... more Five different cell concentrations of Bacillus megaterium (10 × 105 to 50 × 105 cfu/ml) were introduced in structural concrete to achieve the optimum concentration of bacteria. The significant increase in the strength was obtained in the case of 30 × 105 cfu/ml at different ages. The strength of highest grade of bacterial concrete had improved (24%) as compared to lowest grade (12.8%) due to calcification mechanism. Microbial calcite precipitation was quantified using X-ray diffraction analysis, visualized by scanning electron microscopy and analyzed by energy dispersive spectrometer. It was found that the optimum concentration of B. megaterium had a positive effect on high strength structural concrete.
The existent research investigates the ability of Bacillus bacteria species to improve the streng... more The existent research investigates the ability of Bacillus bacteria species to improve the strength of Geo-polymer concrete based on bio-mineralization mechanism. The appropriate cell concentration of bacteria was introduced in ordinary and Geo-polymer concrete by way of the mixing water to compare their strength and durability. In this research, it was found that the compressive strength growth in Geo-polymer bacterial concrete was the highest in comparison to ordinary bacterial concrete at 90 th day. For durability study, the specimens were immersed in 5% H2SO4 solution and the result showed that Geo-polymer bacterial concrete had the least weight and strength losses than ordinary bacterial concrete at different ages. This improvement was due to the temperature condition of Geo-polymer bacterial concrete to survive more bacteria for purpose of calcite precipitation. The density and uniformity of concrete were also examined by ultrasonic pulse velocity (UPV) test. The result showed that the density and uniformity of Geo-polymer structural bacterial concrete were more in comparison to other types of concrete.
The existent research investigates the ability of Bacillus bacteria species to improve the streng... more The existent research investigates the ability of Bacillus bacteria species to improve the strength of Geo-polymer concrete based on bio-mineralization mechanism. The appropriate cell concentration of bacteria was introduced in ordinary and Geo-polymer concrete by way of the mixing water to compare their strength and durability. In this research, it was found that the compressive strength growth in Geo-polymer bacterial concrete was the highest in comparison to ordinary bacterial concrete at 90th day. For durability study, the specimens were immersed in 5% H2SO4 solution and the result showed that Geo-polymer bacterial concrete had the least weight and strength losses than ordinary bacterial concrete at different ages. This improvement was due to the temperature condition of Geo-polymer bacterial concrete to survive more bacteria for purpose of calcite precipitation. The density and uniformity of concrete were also examined by ultrasonic pulse velocity (UPV) test. The result showed that the density and uniformity of Geo-polymer structural bacterial concrete were more in comparison to other types of concrete
Self-healing concretes are being widely recognized as a remedial technique to improve the durabil... more Self-healing concretes are being widely recognized as a remedial technique to improve the durability of concrete. Although, few review papers on self-healing concrete were published, a strong review on all aspects of self-healing concrete cannot be found. In this paper, natural, chemical and biological processes of self-healing concrete technologies were completely reviewed. The main focus of the study is for the biological processes. The review presents a new insight into the research for the treatment of unexpected cracking of concrete. The information presented in this paper can be considered significant for biotechnologists and bioprocess engineers to have comprehensive updates on the current status-quo of selfhealing concrete.
Biological self-healing concrete is a new idea to have concrete structures with more durability. ... more Biological self-healing concrete is a new idea to have concrete structures with more durability. Although, several papers have been published on biological self-healing concrete, a suitable instruction to conduct this type of studies is not reported. Aim of this paper is collecting comprehensive information about conducting a study on self-healing concretes based on previous studies. This paper present many new ideas that have not been completely study. Some idea such as application of fungi, thermopiles bacteria, mix culture of microorganisms or using of aerobic or anaerobic bacteria to design biological selfhealing concrete are suggested in this paper. Ideas of this paper can help researchers to find a suitable and novel subject in biological self-healing area to conduct a strong research.
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Papers by Dr. Ramin Andalib