A Study of Crystalline Mechanism of Penetration  Sealer Materials

Teng, Li-Wei; Huang, Ran; Chen, Jie; Cheng, An; Hsu, Hui‐Mi

doi:10.3390/ma7010399

Cited by 38 publications

(14 citation statements)

References 12 publications

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“…These active chemicals react with the water and cement particles in the concrete and increase the density of calcium silicate hydrates in the concrete and produce pore-blocking precipitates in the capillaries and microcracks [ 10 ]. As a result, the water penetration depth in concrete with incorporated CWA should be lower compared to the water penetration depth in reference concrete, which is confirmed by the authors in [ 10 , 14 ] but also disputed in [ 15 ]. As previously described, CWA also promotes self-healing of cracks [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 75%

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

et al. 2021

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This paper investigates the effectiveness of a specific crystalline waterproofing admixture (CWA) in concrete as a function of a water–binder ratio. Four concrete mixes with and without CWA were prepared; two of them with a water–binder ratio of 0.45 and two of them with a water–binder ratio of 0.55. Water permeability and compressive strength were tested on hardened concrete specimens and self-healing of cracks over time was observed. Cement paste and CWA paste were prepared to clarify the results obtained on the concrete specimens. SEM and EDS and XRD and FTIR were performed on the hardened pastes to explain the mechanism of CWA working. The results show that the addition of CWA had no significant effect on the compressive strength of the concrete, but reduced the water penetration depth in the concrete, and the reduction was more effective for mixes with lower water–binder ratio. Regarding the self-healing effect, it can be concluded that the addition of CWA improves the crack healing in concrete, but the efficiency of self-healing is highly dependent on the initial crack width. The mechanisms involved in the reduction of water penetration depth and crack healing in concrete can be explained by different mechanisms; one is creation of the CSH gel from unreacted clinker grains, then formation carbonate, and additional mechanism is gel formation (highly expansive Mg-rich hydro-carbonate) from magnesium based additives. The presence of sodium silicate, which would transform into carbonate/bicarbonate, also cannot be excluded.

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Section: Introductionmentioning

confidence: 75%

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

et al. 2021

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“…The formation of crystals of this shape may support easy integration of the material into the concrete mix, acting to improve its density and reduce the size of pores, making them finer. 44,45 This can be seen in the interaction between the material and concrete in Fig. 1c and d, which show graphs of the cross-sectional area of the internal parts of the concrete.…”

Section: Microstructure Analysismentioning

confidence: 89%

“…32 Also, it is believed that silicon and sodium, which were also present in this material, will react with calcium hydroxide present in the concrete, in presence of water, to form silica gel that adheres to the walls of the pores. 43,44 This gel will develop into solid crystals after its hydration. The structure of crystals formed from the aforementioned reactions can be recognized in the SEM micrographs in Fig.…”

Section: Microstructure Analysismentioning

confidence: 99%

Integration of Anhydrous Sodium Acetate (ASAc) into Concrete Pavement for Protection against Harmful Impact of Deicing Salt

Al‐Kheetan

Rahman

2019

JOM

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Whilst application of deicing salt is essential to maintain the serviceability of concrete pavements in winter months, penetration of salt through microcracks and pores can be harmful to the underlying reinforcement. The aim of the work presented herein is to develop a shielded concrete by integrating a novel anhydrous sodium acetate (ASAc) compound into fresh concrete. The results of a comprehensive laboratory investigation to analyze the mechanical, physical, and morphological properties of the shielded concrete are presented to identify an optimum mixture design that preserves the compressive strength while enhancing the waterproofing and resistance against chloride penetration of the concrete. Trials were conducted by integrating 2% and 4% ASAc into concrete with four water-to-cement (w/c) ratios of 0.32, 0.37, 0.40, and 0.46. The initial surface absorption test, salt ponding, and compressive strength tests along with scanning electron microscopy (SEM), energy-dispersive x-ray (EDX) spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy analyses were conducted to evaluate the performance and investigate the interaction mechanism of each mixture. The results demonstarted that an optimum mix design could be produced by adding 4% ASAc into mixes with w/c ratio of 0.37 or 0.32.

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“…Researches have evaluated the effect of crystalline catalyst in concretes [11][12][13][14][15][16][17][18]. However, it is relevant to know its potential regarding the mitigation of chloride ions penetration and the increase of service life of concrete structures, characterized, according to Helene [1], by the initiation of corrosion or even by the period in which the chloride ions reach the steel reinforcement in sufficient concentrations to dissolve the steel passivation film.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the chloride penetration and service life of self-healing concretes activated by crystalline catalyst

Helène¹,

Guignone

Vieira

et al. 2018

Rev. IBRACON Estrut. Mater.

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The main cause of concrete structures deterioration is related to the resistance against the penetration of aggressive agents. Aiming at increase the impermeability and reduce the diffusivity of concrete elements, making it less susceptible to the ingress of chloride ions, the use of crystalline catalyst emerges as a good alternative. Its mechanism of autogenous healing enhances the natural pore-filling process of concrete. The aim of this study is to investigate the influence of the use of crystalline catalyst on the chloride ions penetration and service life prediction of concrete. For the concrete mixtures production, it was used blast-furnace slag blended cement, three different water/cement (w/c) ratios (0.45; 0.55; 0.65), with and without crystalline catalyst, totaling six different mixtures. The concrete specimens were cured in a moist chamber and tested at 28 and 91 days. It was performed tests of compressive strength, rapid chloride permeability (ASTM C1202:12), and silver nitrate colorimetric indicator. The results show that, compared to the reference mixture, the use of crystalline catalyst conserved the compressive strength and reduced the chloride ions penetration up to 30%, increasing service life up to 34%.

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A Study of Crystalline Mechanism of Penetration Sealer Materials

Cited by 38 publications

References 12 publications

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

Integration of Anhydrous Sodium Acetate (ASAc) into Concrete Pavement for Protection against Harmful Impact of Deicing Salt

Evaluation of the chloride penetration and service life of self-healing concretes activated by crystalline catalyst

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