Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste

Huang, Haoliang; Ye, Guang; Damidot, D.

doi:10.1016/j.cemconres.2013.05.003

Cited by 231 publications

(139 citation statements)

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“…Three series of specimens were prepared for different tests. The preparations of Series I and II specimens are similar to the previous study (Huang et al, 2013). The detailed information is described in the following.…”

Section: Materials and Specimensmentioning

confidence: 98%

“…As shown in Figure 9, the percentage of CH and CaCO 3 in TG: thermogravimetric; DTG: derivative thermogravimetry. Source: data on self-healing induced with water is reprinted from Huang et al (2013). reaction products induced with Ca(OH) 2 solution is about 80% and 5.4%, respectively, while 77% and 4.9% with water.…”

Section: Mineralogical Analysis On Reaction Products Of Selfhealing Bmentioning

confidence: 99%

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Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent

Huang

2014

Journal of Intelligent Material Systems and Structures

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Cracks in reinforced concrete provide preferential access for aggressive substances into the concrete. Therefore, the corrosion of reinforcement bars is accelerated. Besides, carbonation, sulfate attack, and alkali-silicate reaction take place deep inside the concrete. Fortunately, from previous experiments, it was found that cracks in concrete can be healed with water and Ca is a main chemical element of the reaction products of self-healing. However, the ion concentrations in water can be various depending on the sources of water. There is still a lack of information on the effect of ion concentrations on selfhealing. In this article, the effect of Ca 2+ ions on self-healing was investigated experimentally. Ca(OH) 2 was added into water as a healing agent. Self-healing behavior of cracks with saturated Ca(OH) 2 solution was explored and compared with that with distilled water. In order to gain deeper insight into the mechanism, the reaction products of self-healing were characterized by energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. In addition, the filling fraction of cracks as a function of time was determined by means of backscattered electron image analysis. The efficiency of self-healing induced by saturated Ca(OH) 2 solution was evaluated and compared with that with distilled water.

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Section: Materials and Specimensmentioning

confidence: 98%

Section: Mineralogical Analysis On Reaction Products Of Selfhealing Bmentioning

confidence: 99%

Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent

Huang

2014

Journal of Intelligent Material Systems and Structures

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“…자기치유는 균열이 발생한 시험체에서 일정 폭 이하의 균 열이 적정한 환경에 노출되면 균열이 천천히 닫히는 현상이 다. 이러한 자기치유 현상에 대한 지금까지의 국내외 연구에 의 하면, 균열면에 노출된 미수화 입자들의 재수화(re-hydration) 또는 균열면에 결정성장(recrystalized) 등에 의해 균열이 닫히는 것이 (Wu et al, 2012;Tang et al, 2015;Huang et al, 2013;Palin et al, 2015, Ferrara et al, 2014Qian et al, 2010;Tittelboom et al, 2012). 다양한 혼화 재료를 배합한 시험체의 자기치유 효과에 대한 연구는 자기 치유 효과를 높이기 위한 방법으로 재수화 또는 결정성장을 촉진할 목적으로 GGBFS, FA, SF 또는 metakaolin 등을 사용 하였다 (Sahmaran et al, 2013;Tang et al, 2015;Wu et al, 2012 (Berodier and Scrivener, 2015).…”

Section: 서 론unclassified

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water

Kim¹

2016

Journal of the Korea institute for structural maintenance and i

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The objective of this study is to investigate the self-healing properties of ternary blended cement(TBC) paste made with OPC, GGBFS and FA. The influence of OPC-GGBFS-FA on the self-healing ability of ternary blended cement paste was researched by ultrasonic pulse velocity(UPV) measurement. The TBC paste with GGBFS-FA replacement ratios of 20%, 40% and 60% were prepared having a constant water-cementitious materials ratios os 0.5. The research focuses on behavior after 28days(after loading). Four-point bending tests are used to pre-cracked the prismatic specimens at 28days. For specimens (uncracked and cracked) submerged in tap-water and sea-water until 60days. According to the experimental results, the TBC paste system has self-healing ability increased when the fraction of GGBFS increased. Because GGBFS and FA continues to hydrate after 28days, it is likely that hydrated products from GGBFS and FA may modify microstructures, seal these cracks. From these results, it is clear that the crack in all samples experience self-healing and that this occurs mostly in the first 30days of submerging. Futhermore, most of the healing for both specimens of submerged in sea-water and tap-water occurred during the first 30days. Sea-water submerged specimens healed cracks as fast as those in tap-water. Differences in healing effects of submerged in sea-water and tap-water may be attributed to the presence of specific sea-water ions. Therefore, self-healing effects considered age-effects was more strong effect occurred mostly in the first 30days, and then gradually weaken.

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“…X-ray CT has been applied to deal with the problems of cement hydration and microstructures [4][5][6][7][8][9], mechanical responds such as fracture and deformation [10][11][12][13], calcium leaching [14][15][16][17], carbonation [18,19], and self-healing [20] etc. Different CT systems, including medical CT, industrial CT, and synchrotron CT, have been utilized to study the cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Calibration of grayscale values of cement constituents using industrial X-ray tomography

Wan

Chen

2015

Sci. China Technol. Sci.

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X-ray computer tomography (CT) has been intensively applied to the research of cement-based materials, while most of the CT applications are qualitative. To have more quantitative applications, the arbitrary grayscale values and the specially defined CT numbers of the main cement constituents, including the cement clinkers, the hydrated products, and some durability products are calibrated on an industrial CT system in this study. The calibration results can deepen our understandings of the X-ray CT image of the cement-based materials. The universalities of the calibrated results and the calibration procedures are clarified. The potential applications are anticipated, such as segmentation of the individual phases, quantitative durability research, porosity determinations, and quantitative composition characterizations.computer tomography, cement, calibration Citation:Wan K S, Chen L Y, Xu Q. Calibration of grayscale values of cement constituents using industrial X-ray tomography.

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Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste

Cited by 231 publications

References 21 publications

Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent

Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water

Calibration of grayscale values of cement constituents using industrial X-ray tomography

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Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste

Cited by 231 publications

References 21 publications

Self-healing of cracks in cement paste affected by additional Ca2+ ions in the healing agent

Self-healing of cracks in cement paste affected by additional Ca2+ ions in the healing agent

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water

Calibration of grayscale values of cement constituents using industrial X-ray tomography

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Product

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Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent

Self-healing of cracks in cement paste affected by additional Ca²⁺ ions in the healing agent