&lt;title&gt;Bacterial concrete&lt;/title&gt;

Ramakrishnan, V.; Ramesh, K.; Bang, S. S.

doi:10.1117/12.424404

Cited by 44 publications

(22 citation statements)

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“…Other processes and applications with potential have been identified [28][29][30] and current research includes: -biogeneration of N 2 gas in situ to desaturate soil for increased resistance to liquefaction [31]; -stabilization of surface soils against erosion [32][33][34]; -strengthening and repair of stone structures and monuments [35][36][37][38]; -rehabilitation of concrete [36,[39][40][41][42][43]; -improved capacity of shallow foundations [44]; -dust suppression through agglomeration of fine particles [45]; -modification of ground water flow [46,47]; -biocementation of sands for liquefaction resistance [48]; -co-precipitation of heavy metals in situ [16,18].…”

Section: Envisioning the Possibilities mentioning

confidence: 99%

Soil engineering in vivo : harnessing natural biogeochemical systems for sustainable, multi-functional engineering solutions

DeJong

Soga

Banwart

et al. 2010

J. R. Soc. Interface.

169

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Carbon sequestration, infrastructure rehabilitation, brownfields clean-up, hazardous waste disposal, water resources protection and global warming—these twenty-first century challenges can neither be solved by the high-energy consumptive practices that hallmark industry today, nor by minor tweaking or optimization of these processes. A more radical, holistic approach is required to develop the sustainable solutions society needs. Most of the above challenges occur within, are supported on, are enabled by or grown from soil. Soil, contrary to conventional civil engineering thought, is a living system host to multiple simultaneous processes. It is proposed herein that ‘soil engineering in vivo ’, wherein the natural capacity of soil as a living ecosystem is used to provide multiple solutions simultaneously, may provide new, innovative, sustainable solutions to some of these great challenges of the twenty-first century. This requires a multi-disciplinary perspective that embraces the science of biology, chemistry and physics and applies this knowledge to provide multi-functional civil and environmental engineering designs for the soil environment. For example, can native soil bacterial species moderate the carbonate cycle in soils to simultaneously solidify liquefiable soil, immobilize reactive heavy metals and sequester carbon—effectively providing civil engineering functionality while clarifying the ground water and removing carbon from the atmosphere? Exploration of these ideas has begun in earnest in recent years. This paper explores the potential, challenges and opportunities of this new field, and highlights one biogeochemical function of soil that has shown promise and is developing rapidly as a new technology. The example is used to propose a generalized approach in which the potential of this new field can be fully realized.

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Section: Envisioning the Possibilities mentioning

confidence: 99%

Soil engineering in vivo : harnessing natural biogeochemical systems for sustainable, multi-functional engineering solutions

DeJong

Soga

Banwart

et al. 2010

J. R. Soc. Interface.

169

View full text Add to dashboard Cite

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“…It can also be used for enhanced oil recovery, prevention of acid mine drainage, for remediation of granite, mortar, limestone and concrete (Ramakrishnan et al 2001;Zhong and Islam, 1995).…”

Section: Introductionmentioning

confidence: 98%

Isolation and identification of bacteria to improve the strength of concrete

Krishnapriya¹,

Babu

G³

2015

Microbiological Research

227

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The objective of this research work is to isolate and identify calcite precipitating bacteria and to check the suitability of these bacteria for use in concrete to improve its strength. Bacteria to be incorporated in concrete should be alkali resistant to endure the high pH of concrete and endospore forming to withstand the mechanical stresses induced in concrete during mixing. They must exhibit high urease activity to precipitate calcium carbonate in the form of calcite. Bacterial strains were isolated from alkaline soil samples of a cement factory and were tested for urease activity, potential to form endospores and precipitation of calcium carbonate. Based on these results, three isolates were selected and identified by 16S rRNA gene sequencing. They were identified as Bacillus megaterium BSKAU, Bacillus licheniformis BSKNAU and Bacillus flexus BSKNAU. The results were compared with B. megaterium MTCC 1684 obtained from Microbial Type Culture Collection and Gene Bank, Chandigarh, India. Experimental work was carried out to assess the influence of bacteria on the compressive strength and tests revealed that bacterial concrete specimens showed enhancement in compressive strength. The efficiency of bacteria toward crack healing was also tested. Substantial increase in strength and complete healing of cracks was observed in concrete specimens cast with B. megaterium BSKAU, B. licheniformis BSKNAU and B. megaterium MTCC 1684. This indicates the suitability of these bacterial strains for use in concrete. The enhancement of strength and healing of cracks can be attributed to the filling of cracks in concrete by calcite which was visualized by scanning electron microscope.

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“…One of the methods of implementation of self-repairing ability to concrete is the use of microorganisms [16]. The promising results were obtained using Bacillus Pasteurii.…”

Section: Methods Of Implementation Of Self-repairing Ability To Concretementioning

confidence: 69%

Self-repairing of polymer-cement concrete

Łukowski¹,

Adamczewski²

2013

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. Self-repairing means ability to the total or partial recovering of the properties which were worsened as a consequence of damage of the material. The subject of the paper is evaluation of ability to self-repair of a cement composite modified with epoxy resin without a hardener. The methodology of investigation of self-repairing building materials, developed by the authors, has been described, with controllable enforcing of the limited weakening of the material. Also, the self-repair degree has been defined as the measure of self-repairing ability of the building composites. The material model of the epoxy-cement composite has been developed on the basis of the tests results. The material optimization of the composite towards the maximum self-repairing ability has also been carried out. The results of investigation have confirmed the possibility of self-repairing of the cement composite modified with the epoxy resin without hardener. The conclusion and further research needs in the range of the self-repairing epoxy-cement composites have been pointed out.

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<title>Bacterial concrete</title>

Cited by 44 publications

References 0 publications

Soil engineering in vivo : harnessing natural biogeochemical systems for sustainable, multi-functional engineering solutions

Soil engineering in vivo : harnessing natural biogeochemical systems for sustainable, multi-functional engineering solutions

Isolation and identification of bacteria to improve the strength of concrete

Self-repairing of polymer-cement concrete

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