Bacterial Concrete as a Sustainable Building Material?

Stanaszek-Tomal, Elżbieta

doi:10.3390/su12020696

Cited by 72 publications

(34 citation statements)

References 53 publications

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“…Then microorganism will activate the biomineralization process, generating CaCO 3 precipitates which will solidify on the damaged surface, sealing the material. Furthermore, during their activity, the bacteria consume oxygen avoiding corrosion phenomena and increasing the concrete durability [ 29 ]. In terms of mechanical behavior, Thakur et al [ 30 ] revealed an enhanced mechanical strength in bacteria-based concrete than Portland control samples.…”

Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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In the direction of reducing greenhouse emissions and energy consumption related to the activities of the cement and concrete industry, the increasingly popular concept of eco-sustainability is leading to the development and optimization of new technologies and low impact construction materials. In this respect, geopolymers are spreading more and more in the cementitious materials field, exhibiting technological properties that are highly competitive to conventional Portland concrete mixes. In this paper, the mix design, mechanical properties, microstructural features, and mineralogical properties of geopolymer mixes are discussed, investigating the influence of the main synthesis parameters (curing regime, type of precursors, activator molarity, mix design) on the performance of the final product. Moreover, recent developments of geopolymer technology based on the integration of functional nanofillers are reported. The novelty of the manuscript is to provide a detailed collection of past and recent comparative studies between geopolymers and ordinary Portland concrete mixes in terms of strength properties, durability, fire resistance, and environmental impact by LCA analysis, intending to evaluate the advantages and limitations of this technology and direct research towards a targeted optimization of the material.

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Section: Co 2 Emission Mitigation Strategies In the Cement Industry: An Overviewmentioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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“…These are not only short-lived, but they also have an anisotropy coefficient of 7-9 or more, unlike prototypes with an anisotropy coefficient of 2-3 [49]. An increase in the tensile strength of the masonry with the proposed compositions by 3-5 times is elucidated by the microstructure of the region of contact, for instance, ceramic bricks and mortar [50] (Figure 4). The developed masonry mortar and the wall material are practically a single monolith; in the design of a traditional binder, the interfacial transition (contact) zone is clearly visible, which is the weakest point of the samples [51,52].…”

Section: The Affinity Microstructuresmentioning

confidence: 99%

Self-Healing Construction Materials: The Geomimetic Approach

et al. 2021

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A person spends most of his life in rooms built from various building materials; therefore, the optimization of the human environment is an important and complex task that requires interdisciplinary approaches. Within the framework of the new theory of geomimetics in the building science of materials, the concepts of technogenic metasomatism, the affinity of microstructures, and the possibilities of creating composites that respond to operational loads and can self-heal defects have been created. The article aims to introduce the basic principles of the science of geomimetics in terms of the design and synthesis of building materials. The study’s novelty lies in the concept of technogenic metasomatism and the affinity of microstructures developed by the authors. Novel technologies have been proposed to produce a wide range of composite binders (including waterproof and frost-resistant gypsum binders) using novel forms of source materials with high free internal energy. The affinity microstructures for anisotropic materials have been formulated, which involves the design of multilayered composites and the repair of compounds at three levels (nano-, micro-, macro-). The proposed theory of technogenic metasomatism in the building science of materials represents an evolutionary stage for composites that are categorized by their adaptation to evolving circumstances in the operation of buildings and structures. Materials for three-dimensional additive technologies in construction are proposed, and examples of these can be found in nature. Different ways of applying our concept for the design of building materials in future works are proposed.

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“…A novel class of material that is gaining popularity among researchers in the field of repair and self-healing of concrete and cementitious materials is bacteria-based repair agents, which, according to some authors, represent the frontier in the field of material science [2]. Bacterial concrete has also shown the potential to become an effective response to growing sustainability requests [22]. The basic principle of these repair techniques (Figure 3) is to utilise the ability of some bacterial species to induce precipitation of calciumcarbonate inside the cementitious matrix.…”

Section: Different Approaches To (Self-)healing and Repair With Focus On Bacteria-based Solutionsmentioning

confidence: 99%

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

et al. 2021

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Reinforced concrete crack repair and maintenance costs are around 84% to 125% higher than construction costs, which emphasises the need to increase the infrastructure service life. Prolongation of the designed service life of concrete structures can have significant economic and ecological benefits by minimising the maintenance actions and related increase of carbon and energy expenditure, making it more sustainable. Different mechanisms such as diffusion, permeation and capillary action are responsible for the transport of fluids inside the concrete, which can impact on the structure service life. This paper presents data on microbially induced repair and self-healing solutions for cementitious materials available in the contemporary literature and compares results of compressive strength test and capillary water absorption test, which are relevant to their sealing and mechanical characteristics. The results of the repair and self-healing solutions (relative to unassisted recovery processes) were “normalized.” Externally applied bacteria-based solutions can improve the compressive strength of cementitious materials from 13% to 27%. The internal solution based solely on bacterial suspension had 19% improvement efficacy. Results also show that “hybrid” solutions, based on both bio-based and non-bio-based components, whether externally or internally applied, have the potential for best repair results, synergistically combining their benefits.

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Bacterial Concrete as a Sustainable Building Material?

Cited by 72 publications

References 53 publications

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Self-Healing Construction Materials: The Geomimetic Approach

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

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