Control of the Polymorphism of Calcium Carbonate Produced by Self-Healing in the Cracked Part of Cementitious Materials

Choi, Heesup; Choi, Hyeonggil; Inoue, Masumi; Sengoku, Risa

doi:10.3390/app7060546

Cited by 28 publications

(16 citation statements)

References 19 publications

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“…The changes in grain size of CHPs were caused by the procoagulant effect of Na 2 CO 3 on cement mortar. The introduced Na 2 CO 3 hardened the cement paste in the process of mixing and promoted the precipitation of gyrolite, calcite and conversion of calcium silicate gel [23,24]. With the dosages of Na 2 CO 3 increasing, it is easier for the hardened cement paste to break up during mixing.…”

Section: Size Grading and Bulk Densitymentioning

confidence: 99%

“…These pellets showed a remarkable performance on crack sealing but forfeited the expected mechanical properties and strength healing rates of mortar. Choi [23,24] et al introduced ultra-fine CO 2 bubbles into the saturated Ca(OH) 2 solution to promote the formation of CaCO 3 ; it was found that the crystal forms of CaCO 3 could be controlled by optimizing the temperature and pH, but there was no further study on the mechanical effect. Some scholars [15,25] introduced NaHCO 3 and Na 2 CO 3 into mortar to investigate the cementitious recrystallization with expansive agents.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

Wang

Jiang

2020

Materials

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In this study, a new type of cement-based healing pellets (CHPs) were proposed to accelerate the healing efficiency of concrete, which was mainly based on the introduced Na2CO3 on promoting the formation of calcium carbonate (CaCO3) in cracks. The effects of Na2CO3 on the characteristics of CHPs were firstly investigated, and then the properties of cement mortar mixed with CHPs were studied quantitatively, including the workability, mechanical properties and healing ability. The results showed that higher dosages of Na2CO3 in CHPs decreased the size range of pellets and reduced the setting time, fluidity and heat of hydration of mortar. Still more, CHPs reduced the early strength of mortar but kept the intensity growth rate stable such that it had nearly no negative effect on the later strength. With the content of CHPs increasing, the strength of mortar showed a decreasing trend, while the pore-filling efficiency and strength healing rate of mortar were further improved. In addition, as a new type of self-healing pellets for concrete based on the “build-in” carbonation, CHPs improved the strength and healing effectiveness of cement mortar. When the dosage of Na2CO3 in CHPs and the content of CHPs in mortar were at 10% and 25%, respectively, mortar obtained highest strength in the later stage and the best healing effect.

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Section: Size Grading and Bulk Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

Wang

Jiang

2020

Materials

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“…The tensile strength of concrete is significantly lower than its compressive strength. In particular, cracks inevitably occur in buildings owing to various problems in the mix design and construction process [ 2 ]. Microcracks in buildings are generally not considered significant structural problems [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon occurred due to the rehydration of cement particles and the precipitation of CaCO 3 ; specifically, CaCO 3 was generated by the reaction between Ca 2+ in concrete and CO 3 2− dissolved in water. Further, a strong self-healing effect was observed when CO 2 nanobubble water was used [ 2 ]. Calcium nitrite (Ca(NO 2 ) 2 ) is widely used as the main component in antifreeze admixtures.…”

Section: Introductionmentioning

confidence: 99%

Study on Physical Properties of Mortar for Section Restoration Using Calcium Nitrite and CO2 Nano-Bubble Water

Kim

Choi

et al. 2020

Materials

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This study investigated the physical properties of section-restoration mortar with calcium nitrite (Ca(NO2)2) and carbon dioxide (CO2) nanobubble mixing water to develop materials and methods for the repair and reinforcement of cracks in reinforced concrete (RC) structures. As the calcium nitrite content increased, the generation rate and generated amount of nitrite-based hydration products also increased, owing to the rapid reaction between NO2− ions in calcium nitrite and C3A(Al2O3). Further, the reaction with C3S and C2S was accelerated, thereby increasing the generation rates of Ca(OH)2 and C-S-H. The large amount of Ca2+ ions in these hydration products reacted with CO32− ions in CO2 nanobubble water, thereby increasing the generation of calcite-based CaCO3 in the cement matrix. This appears to have affected strength development and durability improvement via the densification of the structure. These results suggest that the performance of polymer cement mortar for repairing concrete structures can be improved if calcium nitrite and CO2 nanobubble water are properly combined and applied.

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“…And the polymorphism of formed CaCO3 (calcite, vaterite, aragonite [15][16][17][18]) has been studied a lot [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Coherent diffraction study of calcite crystallization during the hydration of tricalcium silicate

et al. 2018

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The aim of this work is using Bragg coherent X-ray diffraction imaging (BCDI) to study the calcite crystallization during carbonation of hydrated tricalcium silicate (C3S). Portland cement is a very complex synthesized product whose 50~70% mass is composed of C3S, which is the most important phase to produce calcium silicate hydrates and calcium hydroxide. Hence, its hydration contributes greatly to the hydration of cement and later to the carbonation of cement products when it reacts with CO2, often from the air, to form calcium carbonates. BCDI has emerged in the last decade as a promising high-resolution lens-less imaging approach for characterization of various samples. It has made significant progress with the development of Xray sources and phase-retrieval algorithms. BCDI allows for imaging the whole three-dimensional structure of micro-and sub-micro-crystalline materials and can show the strain distribution at the nanometer spatial resolution. Results show that calcite crystallization follows a through-solution reaction and the growth model of the calcite crystal can be explained by using "phase domain" theory. During carbonation, calcite crystals grow by increasing the number of phase domains within them while the domain size remains at about 200~300nm.

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Control of the Polymorphism of Calcium Carbonate Produced by Self-Healing in the Cracked Part of Cementitious Materials

Cited by 28 publications

References 19 publications

Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

Preparation and Characterization of Self-Healing Mortar Based on “Build-In” Carbonation

Study on Physical Properties of Mortar for Section Restoration Using Calcium Nitrite and CO2 Nano-Bubble Water

Coherent diffraction study of calcite crystallization during the hydration of tricalcium silicate

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