A systematic investigation of the waterproofing performance and chloride resistance of a self-developed waterborne silane-based hydrophobic agent for mortar and concrete

Xue, Xiao; Li, Yanwen; Yang, Zhuo; He, Zhongyu; Dai, Jian‐Guo; Xu, Lijin; Zhang, Weidong

doi:10.1016/j.conbuildmat.2017.08.042

Cited by 58 publications

(19 citation statements)

References 19 publications

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“…Currently, a new trend for water-repellent treatments based on applying waterborne silanebased hydrophobic agents (micro-emulsions) on the concrete surface appears as a promising alternative for improving the durable performance of concrete [90]. Silane/siloxane emulsions have been also applied for increasing the thermal efficiency of the building envelope without compromising the aesthetics or functionality [91].…”

Section: 1waterproofing Treatmentsmentioning

confidence: 99%

External treatments for the preventive repair of existing constructions: A review

Sánchez

Faria

Ferrara

et al. 2018

Construction and Building Materials

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In the present paper different external surface treatments published in the literature as preventive solutions for improving the performance of existing concrete constructions are presented and discussed. They are categorized as repair materials for concrete conservation, protection surface methods against moisture and aggressive agent penetration, injection techniques for crack sealing and preventive repair solutions with smart functionalities. In a final section, the most extended testing methods for evaluating the effectiveness of the different repair solutions are summarized depending on the property to be enhanced: moisture control and resistance against penetration of aggressive agents. The review shows that although several possibilities exist for the repair of the existing constructions, there is a lack of comparative analysis between the different methodologies. SARCOS COST Action stablishes as scientific objectives to carry out comparative studies including the most advanced solutions for the external repair of concrete, giving criteria for effectiveness assessment and defining robust and reliable methods for charactering the performance of the repaired structures.

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Section: 1waterproofing Treatmentsmentioning

confidence: 99%

External treatments for the preventive repair of existing constructions: A review

Sánchez

Faria

Ferrara

et al. 2018

Construction and Building Materials

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“…Currently, only the organosilicon compounds are used for hydrophobisation concrete with Portland cement. However, the disadvantage of this hydrophobic cement is that it is very expensive [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Calcium Carbonate for Cement Surface

et al. 2017

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This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 • C there was no further increase. The maximum contact angle of 129 • was obtained at the temperature of 60 • C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO 3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13 C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties.

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“…Recently, the effect of silane-based impregnating agent treatments on concrete surfaces has been evaluated by testing water absorption [13][14][15], chloride ion diffusion [16][17][18], carbonation depth [19,20], of the concrete used in this study is shown in Table 1. Natural sand with a 2 mm maximum size and gravel with a 25 mm maximum size were used as fine and coarse aggregates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

Geng

Hou

et al. 2020

Coatings

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Here, a new concrete hydrophobic treatment method is developed using SiO2 sol and silane emulsion. The effectiveness of the modification for concrete protection is evaluated through testing water absorption and chloride diffusion. Two types of concrete with different strength grades (C40, C50) are used as the research object. The results show that the water capillary absorption coefficient and chloride ion diffusion coefficient of concrete decrease greatly under the protection of SiO2 sol and silane emulsion. Additionally, the protection effect is better with the increase of SiO2 consumption. Contact angle test results reveal that when the coating amount of SiO2 sol and silane emulsion is 300 g/m2, respectively, the contact angle reaches 150.2°, indicating the concrete (C40) surface reaches the superhydrophobic state. Through scanning electron microscope (SEM) observation, it is found that the hydrophobic effect of the SiO2 sol/silane emulsion is mainly due to the change in the surface morphology of concrete (C40).

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A systematic investigation of the waterproofing performance and chloride resistance of a self-developed waterborne silane-based hydrophobic agent for mortar and concrete

Cited by 58 publications

References 19 publications

External treatments for the preventive repair of existing constructions: A review

External treatments for the preventive repair of existing constructions: A review

Hydrophobic Calcium Carbonate for Cement Surface

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

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