Self-healing concrete with crystalline admixture made with different cement content

Geraldo, Rodrigo H.; Guadagnini, A. M.; Camarini, Gladis

doi:10.1590/0366-69132021673833118

Cited by 5 publications

(7 citation statements)

References 28 publications

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“…In addition, it was also found that the admixture had no effect on the air content or density of the concrete. On the contrary, Geraldo et al [12] saw the addition of a crystalline admixture, not specified, resulting in reduced slump. This may be attributed to the mixture design as the water to binder ratio was quite high.…”

Section: Discussionmentioning

confidence: 96%

“…Another method of self-healing that has been discussed is the use of different types of admixtures, including mineral or crystalline in creating self-healing concrete. [4,5,7,8,9,10,[11][12][13][14][15][16][17][18][19][20] With crystalline admixtures, the process requires moisture because the CO2 present in it reacts with calcium ions (Ca 2+ ) in the concrete to form calcium carbonate (CaCO3) which starts to fill the cracks and heal the concrete. The healing capability this promotes is for cracks up to 300 µm in width.…”

Section: Introductionmentioning

confidence: 99%

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The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

et al. 2022

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The concept of self-healing concrete is becoming more necessary as sustainability in construction is more desirable. Amongst the current solutions in this technology are autogenous, chemical, and bacterial self-healing. It is paramount that secondary raw materials be used in the production of selfhealing concrete as a form of a sustainable solution. Therefore, in this paper, the admixture “Betocrete-CP-360-WP”, which is a crystallizing waterproofing admixture with hydrophobic effect and is 100% recyclable, has been used and its effect on the physical, chemical, and mechanical properties of concrete, as well as selfhealing capabilities of concrete, have been determined. According to the obtained results, the crystalline additive “Betocrete-CP-360-WP” has no effect on density and slightly increases the amount of entrained air in the concrete mix. However, it does decrease the workability of the concrete mixture which could prove problematic in transportation to the construction site or in concreting in general. Also, with the crystalline admixture in the concrete mix, a 60% reduction in concrete compressive strength after one day of hardening has been estimated, but after 7 and 28 days, the strength attained is within the ranges of the control samples. In addition, concrete containing Betocrete-CP360-WP was 30% less water permeable as compared to control samples. The self-healing efficiency of the concrete was determined by a water flow test through a formed crack (approximately 0.35 mm wide). This was done by gluing a plastic pipe to the top of the cracked concrete specimens and maintaining a constant pressure of the water in the pipe. The experiment was continued for 28 days, and the crack self-healing efficiency of the concrete was calculated from the differences in the amount of water passed through the crack before healing and after 7, 14, 21 and 28 days of the healing process. After 28 days of the water flow test, the cracks in the concrete with the crystalline admixture and recycled concrete dust were completely healed, while the control specimens were not.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

et al. 2022

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“…As amostras destinadas ao ensaio de absorção de água por capilaridade retornaram à cura submersa após o ensaio, permanecendo nessa condição até a idade de 76 dias, quando a capacidade de absorção de água foi novamente avaliada. O retorno das amostras para a cura submersa pode contribuir-para uma maior eficácia da autocicatrização por grãos anidros, intensificando a possibilidade de hidratação ou cristalização contínua dos aditivos cristalinos no processo de autorreparação [5,37]. Os aditivos cristalinos precisam ter acesso a água para o desencadeamento do seu processo químico, promovendo a lixiviação do hidróxido de cálcio do interior da fissura para a superfície, intensificando a formação de carbonato de cálcio [24,38].…”

Section: Pré-carregamento Dos Concretosunclassified

“…Segundo a autora, isso se deve ao fato de que os cimentos de alta resistência inicial já apresentam cerca de 82% da resistência exercida aos 28 dias, já nas fases iniciais. AZARSA et al [18], GERALDO et al [37] e PAZDERKA e HÁJKOVÁ [45] examinaram o impacto do uso de 2% de teor de aditivo cristalino no processo de autocura. Com exceção de PAZDERKA e HÁJKOVÁ [45] no qual não observaram um aumento significativo na resistência à compressão dos concretos analisados aos 28 dias, AZARSA et al [18] e GERALDO et al [37] mostraram que a resistência à compressão axial aos 28 dias das amostras que continham CA, após o período de cura, apresentaram um impacto significativo na recuperação da resistência mecânica.…”

Section: Resistência à Compressão Axialunclassified

Avaliação do desempenho mecânico e absorção capilar de concretos com incorporação de aditivos cristalizante submetidos a danos nas primeiras idades

Tambara,

Júnior,

Venquiaruto

et al. 2024

Matéria (Rio J.)

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RESUMO Esta pesquisa avaliou o fenômeno de autocicatrização nas propriedades mecânicas e absorção capilar de concretos estruturais. Foram avaliados dois aditivos cristalizantes em pó, dosados de acordo com o teor recomendado pelos fabricantes. Aditivos cristalizantes aumentam a densidade do gel C-S-H e formam cristais insolúveis, bloqueando fissuras. Três traços de concreto foram produzidos: referência, aditivo-X com 0,8% e aditivo-Y com 2,0% em relação a massa do cimento. Aplicou-se 75% da carga de ruptura aos 3- e 14-dias para gerar microfissuras e comparar com a referência. Posteriormente, a autocicatrização foi avaliada aos 28- e 76-dias. A propriedade de resistência à compressão axial foi determinada aos 28-dias, revelando que os aditivos cristalizantes contribuíram para um aumento médio de 12% desta propriedade. A idade do carregamento dos concretos não apresentou um impacto significativo na resistência à compressão axial, mas apontou resultados significativos entre os tipos de aditivos estudados, conforme ANOVA. As propriedades de absorção de água por capilaridade foram avaliadas aos 28- e 76-dias, indicando uma redução de absorção de água média de 42% devido ao uso dos aditivos cristalizantes. Em conclusão, a incorporação dos aditivos cristalizantes contribuiu de maneira positiva para a autocicatrização dos concretos estudados, indicando uma recuperação parcial das microfissuras.

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“…In using crystalline admixtures, its nature as water-resistant and permeability-reducing [12] hints at an ability to sustain a lower water absorption rate; this has been established in various experiments with different components of the admixture [18,19,[33][34][35]. However, in the use of crystalline admixtures, there is a lack of comparability in research [16,17] due to nonlinearity in admixture composition and testing methods [12,16], this hinders understanding its feasibility in relation to comparably well-documented performance of bacterial SHC.…”

Section: Durability Propertiesmentioning

confidence: 99%

Low-Carbon Self-Healing Concrete: State-of-the-Art, Challenges and Opportunities

Albuhairi

Sarno

2022

Buildings

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The sustainability of the construction industry is a priority in innovations made towards mitigating its notoriously high carbon emissions. Developments in low-carbon concrete technology are of peak interest today under the scrutiny of emerging policy pressures. Concrete is the external part of most structures vulnerable to permanent degradation and weathering, the possibility of an intrinsic restoration of its engineering properties promises unprecedented advancements towards structural resilience. Existing research in self-healing concrete (SHC) has often concerned the scope of material development and evaluation with inconclusive field testing, hindering its progress towards structural feasibility. This paper presents an overview of recent progress in SHC, and possible opportunities and challenges of popular healing systems are discussed. Moreover, trends are observed to investigate SHC’s influence on the engineering properties of concrete, and future projections of SHC are suggested with identification of potential research needs.

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Self-healing concrete with crystalline admixture made with different cement content

Cited by 5 publications

References 28 publications

The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

Avaliação do desempenho mecânico e absorção capilar de concretos com incorporação de aditivos cristalizante submetidos a danos nas primeiras idades

Low-Carbon Self-Healing Concrete: State-of-the-Art, Challenges and Opportunities

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