Performances of Heat-Insulating Concrete Doped with Straw Fibers for Use in Tunnels

Zhang, Xiao; Liu, Weitao; Cao, Mengting; Zhang, Shuo; Hou, Jiaoyun

doi:10.3390/buildings13030818

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Accordingly, the thermal conductivity decreased with water content, as expected [23]. Notwithstanding, all the thermal conductivity values after the 200 • C thermal treatment were above 0.3 W/mK, the required value indicated in the literature for high-temperature concrete [46,47]. According to the following equation, dQ/dt = −kA dT/dt, thermal conductivity (k) is the most important physical property, which guarantees a rapid and complete charge/discharge cycle of a thermal storage unit [43][44][45][46][47][48][49].…”

Section: Thermal Measurementssupporting

confidence: 69%

“…Notwithstanding, all the thermal conductivity values after the 200 • C thermal treatment were above 0.3 W/mK, the required value indicated in the literature for high-temperature concrete [46,47]. According to the following equation, dQ/dt = −kA dT/dt, thermal conductivity (k) is the most important physical property, which guarantees a rapid and complete charge/discharge cycle of a thermal storage unit [43][44][45][46][47][48][49]. A cement paste for plaster could preferably be used for improving the comfort of a building, reducing energy consumption through a heat-storing element for passive solar heating.…”

Section: Thermal Measurementsmentioning

confidence: 78%

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Cement Pastes with Hygroscopic Polymeric Additions for Potential Building Applications

Di Maggio,

Maracchini,

Cotini

et al. 2024

Applied Sciences

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The development of highly predictive analysis for designing cementitious composite with improved thermal and hygroscopic performance for building and construction poses a significant challenge. To investigate new potential applications, cement pastes have been prepared using a cement, sand, and crystallization admixture, with highly hygroscopic polymer additions (SA-PA) of sodium polyacrylate and/or recycled polyamide fibers. The porosity evolution was investigated at different curing stages and after heat treatment at 200 °C, the temperature at which the paste dehydrates quickly without structural changes. Mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), cyclic shear tests, thermal conductivity, and diffusivity measurements were carried out on the cement pastes to assess their microstructure. The behavior of the cement pastes varied with polymer additions and thermal treatments; ka−0.5 must be maximized in heat storage applications, where a and k are thermal diffusivity and conductivity, respectively. In contrast, the product a0.5k−1 must be maximized in energy-efficient insulation. Cement pastes with SA-PA exhibited the highest values of both 9.191 102 m−2 K−1 s0.5 W and 1.088 10−3 m2 K s−0.5 W−1, respectively. After the thermal treatment at 200 °C, SA-PA samples maintained the highest heat-storing performance of 6.258 102 m−2 K−1 s0.5 W, while the samples with SA-PA and polyamide fibers performed better in energy-efficient insulation, demonstrating performance of 2.552 10−3 m2 K s−0.5 W−1. These results, discussed in terms of pore size distribution, suggest potential applications in the building field and are valuable for designing plaster and concrete for applications such as thermal and hygroscopic control.

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Section: Thermal Measurementssupporting

confidence: 69%

Section: Thermal Measurementsmentioning

confidence: 78%

Cement Pastes with Hygroscopic Polymeric Additions for Potential Building Applications

Di Maggio,

Maracchini,

Cotini

et al. 2024

Applied Sciences

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Thermal and acoustic performance in textile fibre-reinforced concrete: An analytical review

Wijesinghe,

Gunasekara,

Law

et al. 2024

Construction and Building Materials

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Improvement in the strength of concrete reinforced with agriculture fibers: Assessment on mechanical properties and microstructure analysis

Ahmad,

Mohammed Jebur,

Tayyab Naqash

et al. 2024

Journal of Engineered Fibers and Fabrics

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Concrete is weak in tension, causing brittle failure without warning. Fiber is one of the simplest techniques to increase tensile strain. Several kinds of fibers (synthetic) are available such as steel fiber, glass fiber, and carbon fiber. However, these fibers are expensive and cannot be easily accessible. Researchers use agricultural fiber in concrete instead of synthetic fibers to offset this deficiency. Although, several studies have shown that agricultural fiber may be utilized to increase concrete tensile strength. However, a details review is required which combines all relevant information and the reader can evaluate the benefits of agricultural fiber. Therefore, this review focus on a comprehensive and up-to-date overview of the impact of agricultural fiber on concrete slump flow, mechanical quality, and durability. Furthermore, scanning electronic microscopy, enhancement methods, and agricultural fiber-reinforced concrete (AFRC) applications are also reviewed. Five different types of agricultural fiber including coconut, jute, banana, rice straw, and hemp fibers were selected. According to the findings, agricultural fiber increased concrete’s mechanical and durability qualities while comparably decreasing the slump. The optimum dose is essential as the higher dose adversely affects mechanical performance. The typical optimum amount varies from 1% to 2% by weight/volume of the binder. Among various types of agricultural fiber, coconut fiber is super performance. Less research is carried out on hemp, straw ash, and banana fibers than on coconut and jute fibers.

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Performances of Heat-Insulating Concrete Doped with Straw Fibers for Use in Tunnels

Cited by 4 publications

References 25 publications

Cement Pastes with Hygroscopic Polymeric Additions for Potential Building Applications

Cement Pastes with Hygroscopic Polymeric Additions for Potential Building Applications

Thermal and acoustic performance in textile fibre-reinforced concrete: An analytical review

Improvement in the strength of concrete reinforced with agriculture fibers: Assessment on mechanical properties and microstructure analysis

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