Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials

Bao, Jiuwen; Li, Shuguo; Zhang, Peng; Xue, Shanfeng; Cui, Yifei; Zhao, Tong

doi:10.1016/j.jmrt.2020.08.046

Cited by 86 publications

(33 citation statements)

References 43 publications

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“…It can be seen from Figure 9 that the simulated results are basically the same as the experimental e simulated chloride penetration depth is greater than that of the experiment. is could be explained as follows: (1) Bao et al's [48] study shows that the higher the relative humidity of the specimen-exposed environment leads to the greater water content within the specimen. e chloride diffusion was tested in a closed salt spray corrosion environment with a high RH, resulting in greater internal water content of the concrete specimens.…”

Section: Chloride Transport Model Validation In Saturatedmentioning

confidence: 99%

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Zhang

Wang

Ling

et al. 2021

Advances in Materials Science and Engineering

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Marine atmosphere environment accelerates the process of chloride penetration into concrete under the coupling effect of ambient temperature and relative humidity, thereby reducing the durability and service life of concrete. This paper aims to investigate the change of water equilibrium saturation and the chloride transport properties of concrete materials in different environments. The water equilibrium saturation tests at three temperatures and five relative humidity (RH) and salt spray erosion tests at three temperatures were performed. The influence of RH and temperature on the equilibrium saturation of concrete and the influence of temperature and time on the chloride diffusion coefficient are investigated. The results show that, in the process of moisture absorption and desorption, the equilibrium saturation of concrete gradually decreases as temperature rises. At the same depth of concrete, the chloride content gradually increases with temperature increasing, as well as the chloride diffusion coefficient. However, as the corrosion time of salt spray increases, the altering of chloride diffusion coefficient becomes less. Based on the Kelvin equation, a relationship between capillary pressure and water saturation in concrete was established, and a moisture transfer model for concrete in the process of moisture absorption and desorption was derived. Further, based on the established chloride diffusion equation and heat balance equation, a model of temperature-wet-chloride coupling chloride transfer was derived. Theory model simulation results show the transfer speed of chloride under the coupling of diffusion and capillary is higher than pure diffusion in moisture in the absorption process. However, the opposite is true in the desorption process. Moreover, with the increment of saturation rate, the capillary effect on chloride transport is enhanced.

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Section: Chloride Transport Model Validation In Saturatedmentioning

confidence: 99%

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Zhang

Wang

Ling

et al. 2021

Advances in Materials Science and Engineering

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“…Existe una amplia gama de hidrofugantes creados específicamente para la protección de los geomateriales y adaptados al ambiente al que vayan a estar expuestos: organofluorados, siloxanos, silanos (Fort 2007;Bao et al 2020), inorgánicos nanoparticulados (Pérez et al 1995;Martínez 2017), combinaciones como oligómeros o incluso con medios orgánicos como las acrilsiliconas, entre otros muchos. Asimismo, encontramos variaciones del diluyente, generalmente apolar como el White Spirit, pero también en isopropanol o agua, para adaptarse a los requerimientos de los soportes.…”

Section: -Tratamientos De Hidrofugación De Pinturas Muralesunclassified

“…There is a wide range of water repellents explicitly created for the protection of geomaterials and adapted to the environment to which they will be exposed: organofluorinated, siloxanes, silanes (Fort 2007;Bao et al 2020), inorganic nanoparticles (Pérez et al 1995;Martínez 2017), combinations such as oligomers or even with organic media such as acrylsilicones, among many others. There are also variations in the diluent, generally non-polar such as White Spirit and isopropanol or water, to adapt to the requirements of the substrates.…”

Section: Los Docentes Revisan La Literatura Científica Relacionada -Water-repellent Treatments For Wall Paintingsmentioning

confidence: 99%

Estrategias didácticas basadas en la investigación en estudios de Grado: conservación y restauración de patrimonio pictórico sobre soportes de cemento

Barberana¹,

Ruitiña²

2021

GEC

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Se expone el diseño y ejecución de un proyecto didáctico de aula que busca favorecer estrategias investigadoras entre los estudiantes de Grado en Conservación-Restauración de la Escuela Superior de Arte del Principado de Asturias. Se centra en el estudio de algunos tratamientos de fijación, consolidación e hidrofugación de patrimonio pictórico sobre hormigón ubicado en intemperie, que ofrecen múltiples interrogantes por su contemporaneidad y escasa investigación. La metodología didáctica es activa, basada en el método científico y en el aprendizaje por equipos. Mediante probetas, se comparan algunos productos recomendados para restauración de patrimonio geomaterial ubicado en intemperie con otros más novedosos. Las técnicas pictóricas escogidas son: temples de caseína y pintura a la cal sobre mortero de cemento. Una vez curadas, se someten a ciclos de envejecimiento acelerado: contraste de humedad, de temperatura y envejecimiento salino. Asimismo, se evalúan el cambio cromático de visu, la capacidad hidrófoba y consolidativa.

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“…The water content in traditional cement-based materials has a remarkable influence on their workability [20][21][22][23]. Water is driven off in the cement-manufacturing process, and then chemical changes occur that make the final powder reactive in the presence of water.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Electric- and Magnetic-Activated Water and Its Influence on the Workability and Mechanical Properties of Cement Mortar

et al. 2021

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Cement-based materials prepared with activated water induced by a magnetic field or electric field represent a possible solution to environmental issues caused by the worldwide utilization of chemical admixtures. In this contribution, electric- and magnetic-activated water have been produced. The workability and mechanical properties of cement mortar prepared with this activated water have been investigated. The results indicate that the pH and absorbance (Abs) values of the water varied as the electric and magnetic field changed, and their values increased significantly, exhibiting improved activity compared with that of the untreated water. In addition, activated water still retains activity within 30 min of the resting time. The fluidity of the cement paste prepared with electric-activated water was significantly larger than that of the untreated paste. However, the level of improvement differed with the worst performance resulting from cement paste prepared with alternating voltage activated water. In terms of mechanical properties, both compressive strength and flexural strength obtained its maximum values at 280 mT with two processing cycles. The compressive strength increased 26% as the curing time increased from 7 days to 28 days and flexural strength increased by 31%. In addition, through the introduction of magnetic-activated water into cement mortar, the mechanical strength can be maintained without losing its workability when the amount of cement is reduced.

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Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials

Cited by 86 publications

References 43 publications

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Estrategias didácticas basadas en la investigación en estudios de Grado: conservación y restauración de patrimonio pictórico sobre soportes de cemento

Preparation of Electric- and Magnetic-Activated Water and Its Influence on the Workability and Mechanical Properties of Cement Mortar

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