Experimental investigation on thermal conductivity of aerogel-incorporated concrete under various hygrothermal environment

Wang, Yingying; Huang, Jinjin; Wang, Dengjia; Liu, Yanfeng; Zhao, Zejiao; Liu, Jiaping

doi:10.1016/j.energy.2019.115999

Cited by 45 publications

(9 citation statements)

References 59 publications

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“…The force required to separate the agglomerates, which are achieved by the coalescence of many primary particles, will always be higher than the force required for the nucleation of the primary particles. The addition of viscous material can reduce the separating force of the liquid bridge [54][55][56][57]. In this study, granules consisting of fly ash and GGBS are responsible for the increase or decrease in power consumption, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

et al. 2022

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The production and utilization of concrete and concrete-based products have drastically increased with the surge of construction activities over the last decade, especially in countries such as China and India. Consequently, this has resulted in a corresponding increase in the energy used for the production of ready-mixed concrete. One approach to reduce the cost of concrete manufacturing is to reduce the energy required for the manufacturing process. The main hypothesis of this study is that the power required for mixing the concrete can be reduced through the use of mineral admixtures in the mix design. Optimization of energy consumption during mixing using admixtures in concrete manufacturing is the predominant focus of this article. To achieve this objective, power consumption data were measured and analyzed throughout the concrete mixing process. The power consumption curve is the only source to distinguish the behavior of the different materials used in the concrete in a closed chamber. In the current research, fly ash and ground granulated blast-furnace slag (GGBS) were used as mineral admixtures to produce ready-mixed concrete. The experimental study focused on the influence of GGBS and fly ash on power consumption during concrete mixing. The results indicated that the use of a higher content of GGBS is more beneficial in comparison to the use of fly ash in the mix due to the lower mixing time required to achieve homogeneity in the mixing process. It was found that the amount of energy required for mixing is directly related to the mixing time for the mix to achieve homogeneity.

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Section: Resultsmentioning

confidence: 99%

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

et al. 2022

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“…The residual SA clinging on the surface of specimens was scraped after ventilation. We can see from the fabrication process that as compared with sol-gel method, the physical doping method is easier to manufacture [18]- [19]. The fabricated composites were finally dried for 48h in a thermostat at 60.0 ± 1.0 °C.…”

Section: Specimen Preparationmentioning

confidence: 99%

Thermal Conductivity of Silica-aerogel (SA) and Autoclave Aerated Concrete (AAC) Composites

Tian

Fan

et al. 2020

E3S Web Conf.

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Improving the thermal insulating performance of porous building materials is of great practical significance for building energy conservation. In this work, silica aerogels (SA) with ultralow thermal conductivity were proposed as an appropriate candidate to be integrated with autoclaved aerated concrete (AAC) to produce novel SA-AAC composites with higher thermal insulating performance by physical solution impregnation method. The pore-structures, mechanical and thermal properties of the SA-AAC composites were probed by various experimental tests. According to the microscopy and porosimetry results, SA were observed to adhere to the surface walls of the AAC holes, thus reducing the amount of macro-sized pores. In addition, the improved thermal insulating performance of AAC was successfully achieved with the relative improvement depending on the porosity of the pristine AAC. At the mass fraction of SA of ~7%, the highest relative improvement was found to be ~30% The results of this work exhibited a great potential of this novel SA-AAC composite in engineering applications.

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“…On the contrary, in the actual high geothermal engineering environment, due to the irregularity of geological structure, rock properties, groundwater activities and deep crustal structure, the temperature of surrounding rock is usually variable temperature evolution rather than constant temperature evolution. [46][47][48][49][50] At present, the deterioration performance of shotcrete under variable temperature environment is unknown, and the limit temperature that different mechanical properties can bear in shotcrete has not been systematically studied. Accordingly, six temperatures were set to simulate the high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation on mechanical and thermal insulation properties of shotcrete under constant‐variable temperature

Chen

Zhao

Meng

et al. 2022

Structural Concrete

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One of the commonly used stabilization systems for rock tunnel is shotcrete. However, the hydration of shotcrete is usually accompanied by the development of internal defects and micro damage under high temperature. Additionally, in the actual high‐temperature engineering, the temperature of the rock tunnel exhibits irregular changes. Therefore, in this study, the curing conditions of constant temperature (23°C, 40°C, 60°C, 80°C) and variable temperature (23–40–60–80°C, 80–60–40–23°C) are set, respectively. The mechanical properties and structural properties of polyurethane shotcrete and ordinary Portland shotcrete are introduced. It is determined that the limit temperature for inhibiting the development of sprayed concrete's compressive and splitting strength is between 60°C and 80°C, and the limit temperature for inhibiting the development of bond strength is about 40°C. Meanwhile, the influence of high temperature on the thermal insulation performance of shotcrete is considered. The results that the self‐foaming performance of polymer(polyurethane) reduces the thermal conductivity of shotcrete. Based on this phenomenon, the heat transfer model of shotcrete at room and high temperature is established to clarify the heat transfer process of shotcrete. Results will provide theoretical basis for further research of durability and heat insulation performance of protective spraying material for tunnel under high temperature.

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Experimental investigation on thermal conductivity of aerogel-incorporated concrete under various hygrothermal environment

Cited by 45 publications

References 59 publications

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

Effects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing

Thermal Conductivity of Silica-aerogel (SA) and Autoclave Aerated Concrete (AAC) Composites

Experimental evaluation on mechanical and thermal insulation properties of shotcrete under constant‐variable temperature

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