Biological process of soil improvement in civil engineering: A review

Umar, Murtala M; Kassim, Khairul Anuar; Chiet, Kenny Tiong Ping

doi:10.1016/j.jrmge.2016.02.004

Cited by 153 publications

(67 citation statements)

References 40 publications

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“…Formation of calcite commences when urea decomposes by urease enzyme at a favourable condition, which is normally alkaline in nature. Several studies reported that calcite precipitation occurs most under alkaline condition ranging from 7.5-9.5 [32,33] except for a small group of acid ureases with optimum pH of near neutral [34]. Arunachalam [35] performed MICP treatment using Bacillus sphaericus, a pH of 8 was reported to be the peak for calcite precipitation.…”

Section: Phmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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Recently, the concept of using biological process in soil improvement otherwise called bio-mediated soil improvement technique has shown greater prospects in the mitigation of liquefiable soils. It is an environmental friendly technique that has generated great interest to geotechnical engineers. This paper presents a review on the microorganism responsible for the biological processes in soil improvement system, factors that affect biological process, identifying the mechanism of liquefaction and commonly adopted method to mitigate liquefaction. Next, the effect of microbial induced calcite precipitation (MICP) on the strength and cyclic response were also analyzed, where it was identified that higher cementation level leads to formation of larger sized calcite crystals which in turn leads to the improved shear strength, stiffness and cyclic resistance ratio of the soil. However, the effects of various bacteria, cementation reagent concentrations amongst other factors were not fully explored in most of the studies. Finally, some of the challenges that lay ahead for the emerging technology are optimizing treatment factors (bacteria and cementation reagent concentration), upscaling process, training of researchers/technologist and long – time durability of the improved soils.

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Section: Phmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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“…The amount of the CaCO 3 that will be formed during the treatment process depends on the rate of the migration of input materials through the soil texture [29]. The hydrolytic restrictions would be a reason of declination in bacteria activity by restraining bacteria and its products to flow through soil pores [30,31] and interrupts the precipitation process of CaCO 3 . Furthermore, the permeability of the soil can change during the treatment.…”

Section: A Pore Sizementioning

confidence: 99%

Properties of Biomineralization Process in Various Types of Soil and Their Limitations

Mousa*¹,

Nahazanan²,

Huat³

et al. 2019

IJEAT

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Weak and problematic soils affect stability and safety of structures founded on them. The problems occur due to limitation or absence of shear strength or over shear stress applied on the soil during loading which then lead to large settlement and consequently failure to the founded structures. Replacing the soil with better materials would be very costly as these types of soil are normally extended to a great depth under the ground surface. The proposed solution for such kind of soils is curing weak soils instead of replacing them. One of the proposed treatment methods is bio-grouting in which the conditions and the scales of the application differs according to the soil types and limitations. Reviews on previous researches have shown that treatment results by bio-grouting method are controlled by several factors, such as size of pores, value of pH, duration of treatment, presence of water and electro-kinetic effect, which give impact to treatment results quality and quantity. The outcome can go as far as killing the bacteria which then reduce the microbial growth if it was not controlled. Understanding of bio-grouting process and its application will help in improving the engineering properties of the weak soils and its applications.

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“…Are good in solubilizing phosphorus (P) and have the advantage of forming stress-resistant in plants. According to Umar et al (2016), Fusarium enhanced root enlargement. Fusarium also facilitated the development of tap and lateral roots in the plant (Yigit and Dikilitas, 2008) which means for a crop like cassava, Fusarium will facilitate an increase in the number of roots and enlarge root size which are key components of yield determination.…”

Section: Microbes and Soil Improvementmentioning

confidence: 99%

Microbial Soil Enhancer: The Panacea to Land as a Limiting Resource in Agricultural Productivity

Ikuli¹,

Akonye²

2019

Greener J Agr Sci

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Land is an inevitable resource in agricultural production and its health status determines the position of agriculture in the present and future. The study investigated the ability of microbial soil enhancer to increase yield and soil nutrients, maintain soil health for sustainable and continuity in agriculture. Two (2.5ml/liter) of microbial soil enhancer was applied to the soil before planting and thereafter, 2ml/liter was applied through foliar application after every four weeks till maturity, followed by treatments with different rates of inorganic fertilizer NPK15:15:15 (20g/plant, 15g/plant, and 10g/plant). The study revealed that microbial soil enhancer gave the best-improved yield (52.67 Ton/Ha), SOM and many primary nutrients when used with 50% (10g/plant) inorganic fertilizer. Microbial soil enhancer improved and balanced the soil microorganism's community, making the soil fit for sustainable use and continuity in agriculture. It generated pro-bacteria and fungi needed for plant protection and productivity. The study also revealed that microbial soil enhancer should not be used in a virgin or fertile soil to avoid disaster outbreak. It is also good for bioremediation. It should be encouraged and supplemented with a low rate of inorganic fertilizer to increase yield, sustainability, and continuity in agriculture and also for bioremediation, to reclaim agricultural lands lost to pollution.

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Biological process of soil improvement in civil engineering: A review

Cited by 153 publications

References 40 publications

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Properties of Biomineralization Process in Various Types of Soil and Their Limitations

Microbial Soil Enhancer: The Panacea to Land as a Limiting Resource in Agricultural Productivity

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