Numerical modeling for crack self-healing concrete by microbial calcium carbonate

Algaifi, Hassan Amer; Bakar, Suhaimi Abu; Sam, Abdul Rahman Mohd; Abidin, Ahmad Razin Zainal; Shahir, Shafinaz; Altowayti, Wahid Ali Hamood

doi:10.1016/j.conbuildmat.2018.08.218

Cited by 58 publications

(18 citation statements)

References 42 publications

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“…Similarly, the correlations between the actual and obtained data from the RSM models were also examined using correlation statistical parameters as shown in Equations (8)–(10) [ 63 , 64 ]. Specifically, the determination coefficient ( R 2 ), correlation coefficient ( R ), and adjusted R 2 were computed and evaluated, where K represented the number of independent parameters.…”

Section: Materials and Optimisation Modellingmentioning

confidence: 99%

Optimisation of GBFS, Fly Ash, and Nano-Silica Contents in Alkali-Activated Mortars

et al. 2021

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Although free-cement-based alkali-activated paste, mortar, and concrete have been recognised as sustainable and environmental-friendly materials, a considerable amount of effort is still being channeled to ascertain the best binary or ternary binders that would satisfy the requirements of strength and durability as well as environmental aspects. In this study, the mechanical properties of alkali-activated mortar (AAM) made with binary binders, involving fly ash (FA) and granulated blast-furnace slag (GBFS) as well as bottle glass waste nano-silica powder (BGWNP), were opti-mised using both experimentally and optimisation modelling through three scenarios. In the first scenario, the addition of BGWNP varied from 5% to 20%, while FA and GBFS were kept constant (30:70). In the second and third scenarios, BGWNP (5–20%) was added as the partial replacement of FA and GBFS, separately. The results show that the combination of binary binders (FA and GBFS) and BGWNP increased AAM’s strength compared to that of the control mixture for all scenarios. In addition, the findings also demonstrated that the replacement of FA by BGWNP was the most significant, while the effect of GBFS replacement by BGWNP was less significant. In particular, the highest improvement in compressive strength was recorded when FA, GBFS, and BGWNP were 61.6%, 30%, and 8.4%, respectively. Furthermore, the results of ANOVA (p values < 0.0001 and high F-values) as well as several statistical validation methods (R > 0.9, RAE < 0.1, RSE < 0.013, and RRSE < 0.116) confirmed that all the models were robust, reliable, and significant. Similarly, the data variation was found to be less than 5%, and the difference between the predicted R2 and adj. R2 was very small (<0.2), thus confirming that the proposed non-linear quadratic equations had the capability to predict for further observation. In conclusion, the use of BGWNP in AAM could act as a beneficial and sustainable strategy, not only to address environmental issues (e.g., landfill) but to also enhance strength properties.

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Section: Materials and Optimisation Modellingmentioning

confidence: 99%

Optimisation of GBFS, Fly Ash, and Nano-Silica Contents in Alkali-Activated Mortars

et al. 2021

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“…The reactions from Path I to Path VII are represented below: Consequently, employing particular species of bacteria having sustainable organic attributes with a high rate of survival as healing agents is one of the best mechanisms to manufacture this kind of self-healing bacterial or bio-concrete. Quite recently, the application of the bio-method for mending the cracks was also suggested by several researchers [128,130] through inducing particular species of bacteria within the concrete. Gollapudi et al [141] carried out investigations in the mid-1990s and proposed for induction of an environment benevolent approach to healing cracks into concrete, whereby urease enzyme producing ureolytic bacteria was induced to pick up the pace for the calcium carbonate precipitation in the micro-cracks into the concrete.…”

Section: Bacterial Bio-agents Of Self-healingmentioning

confidence: 99%

Review on Performance Evaluation of Autonomous Healing of Geopolymer Composites

Luhar

Shaikh

2021

Infrastructures

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It is a universal fact that concrete is one of the most employed construction materials and hence its exigency is booming at a rocket pace, which in turn, has resulted in a titanic demand of ordinary Portland cement. Regrettably, the production of this essential binder of concrete is not merely found to consume restricted natural resources but also found to be associated with emission of carbon dioxide—a primary greenhouse gas (GHG) which is directly answerable to earth heating, resulting in the gigantic dilemma of global warming. Nowadays, in order to address all these impasses, researchers are attracted to innovative Geopolymer concrete technology. However, crack development of various sizes within the concrete is inevitable irrespective of its kind, mix design, etc., owing to external and internal factors viz., over-loading, exposure to severe environments, shrinkage, or error in design, etc., which need to be sealed otherwise these openings permits CO2, water, fluids, chemicals, harmful gases, etc., to pass through reducing service life and ultimately causing the failure of concrete structures in the long term. That is why instant repairs of these cracks are essential, but manual mends are time-consuming and costly too. Hence, self-healing of cracks is desirable to ease their maintenances and repairs. Self-healing geopolymer concrete (SHGPC) is a revolutionary product extending the solution to all these predicaments. The present manuscript investigates the self-healing ability of geopolymer paste, geopolymer mortar, and geopolymer concrete—a slag-based fiber-reinforced and a variety of other composites that endow with multifunction have also been compared, keeping the constant ratio of water to the binder. Additionally, the feasibility of bacteria in a metakaolin-based geopolymer concrete for self-healing the cracks employing Bacteria-Sporosarcina pasteurii, producing Microbial Carbonate Precipitations (MCP), was taken into account with leakage and the healing process in a precipitation medium. Several self-healing mechanisms, assistances, applications, and challenges of every strategy are accentuated, compared with their impacts as a practicable solution of autogenously-healing mechanisms while active concretes are subjected to deterioration, corrosion, cracking, and degradation have also been reviewed systematically.

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“…Biological mechanisms for repair involving the introduction of bacteria into the concrete have been recently suggested [ 59 , 60 , 61 , 62 , 63 ]. During the middle of the 1990s, a sustainable method for healing cracks in concrete was proposed by Gollapudi [ 64 ] that involved the introduction of ureolytic bacteria to speed up CaCO 3 precipitation in the concrete micro-crack zones.…”

Section: Mechanism Of Self-healing In Cementitious Materialsmentioning

confidence: 99%

Biomimetic Self-Healing Cementitious Construction Materials for Smart Buildings

Shah

Huseien

2020

Biomimetics

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Climate change is anticipated to have a major impact on concrete structures through increasing rates of deterioration as well the impacts of extreme weather events. The deterioration can affect directly or indirectly climate change in addition to the variation in the carbon dioxide concentration, temperature and relative humidity. The deterioration that occurs from the very beginning of the service not only reduces the lifespan of the concretes but also demands more cement to maintain the durability. Meanwhile, the repair process of damaged parts is highly labor intensive and expensive. Thus, the self-healing of such damages is essential for the environmental safety and energy cost saving. The design and production of the self-healing as well as sustainable concretes are intensely researched within the construction industries. Based on these factors, this article provides the materials and methods required for a comprehensive assessment of self-healing concretes. Past developments, recent trends, environmental impacts, sustainability, merits and demerits of several methods for the production of self-healing concrete are discussed and analyzed.

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Numerical modeling for crack self-healing concrete by microbial calcium carbonate

Cited by 58 publications

References 42 publications

Optimisation of GBFS, Fly Ash, and Nano-Silica Contents in Alkali-Activated Mortars

Optimisation of GBFS, Fly Ash, and Nano-Silica Contents in Alkali-Activated Mortars

Review on Performance Evaluation of Autonomous Healing of Geopolymer Composites

Biomimetic Self-Healing Cementitious Construction Materials for Smart Buildings

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