Mechanical properties and its reliability prediction of engineered /strain-hardening cementitious composites (ECC/SHCC) with different moisture contents at negative temperatures

Huo, Yanlin; Sun, Huayang; Chen, Zhitao; Yang, Yutao

doi:10.1016/j.cemconcomp.2022.104812

Cited by 28 publications

(2 citation statements)

References 37 publications

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“…Unfortunately, directly mixing such a high concentration of CNT would undoubtedly result in much-increased viscosity and reduced workability of the cement composites [43,44]. Note that the importance of workability lies in need for low viscosities during the mixing and pouring process and in the influence of the final mechanical strengths for the hardened cement composites [45][46][47][48][49]. More importantly, the higher conductivity generally requires improved CNT dispersion quality; however, it inevitably further decreases the flowability of cement because of the increased CNT-cement interaction.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes-coated cement particles for cement-based sensors with excellent piezoresistivity

Yuan

Dong

et al. 2023

Smart Mater. Struct.

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Typically, self-sensing cement composites are prepared by directly mixing cement particles with conductive additives, such as carbon black, carbon nanotubes (CNT), and graphene. This study proposes a novel approach to directly coat cement particles with CNT as the conductive filler (CNT@cement) before contact with water, aiming to develop a high-performance self-sensing cement-based sensor. CNT@cement nano/micro hybrid fabrication relies on a simple and efficient method that enables the uniform absorption of CNT on the surface of cement particles without any surfactants, thereby not diminishing the workability and mechanical properties of cement composites. This cement composite exhibits improved microstructure, bending strength, and electrical conductivity. Remarkably, the formulation with the addition of 0.1 wt% CNT@cement hybrid increases the bending strength by about 23% and improves the electrical conductivity by approximately two orders of magnitude, outperforming previously reported cement composites with similar CNT content. Additionally, outstanding piezoresistivity with a fractional change in resistivity (FCR) of 1.26 is achieved for our cement-based sensor. These findings represent a major step toward the practical application of CNT in structural health monitoring.

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Section: Introductionmentioning

confidence: 99%

Carbon nanotubes-coated cement particles for cement-based sensors with excellent piezoresistivity

Yuan

Dong

et al. 2023

Smart Mater. Struct.

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“…As the chemical composition of GGBFS is similar to that of cement, many researchers focus on the use of GGBFS as an alternative binder in concrete [ 27 , 28 ]. Since the 1960s, a new type of alkali-activated slag concrete (AASC) using GGBFS and an alkali activator has been rapidly developed [ 29 , 30 , 31 , 32 ]. Many researchers found using alkali activators such as NaOH and water glass could activate the potential hydraulicity of GGBFS [ 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Huo

Huang²,

Han

et al. 2023

Materials

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This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For the aggregates, both natural and recycled aggregates were used. Three specimens with dimensions of 800 mm × 800 mm × 800 mm were prepared to simulate mass concrete. The workability, temperature aging and strength of the mass concrete were tested. The test results showed that utilizing HVGGBFS concrete as mass concrete can significantly reduce the heat of hydration due to the low heat of hydration of GGBFS, while the heat of hydration of GGBFS and recycled aggregate combination is 11.2% higher than normal concrete, with a slump that is 31.3% lower than that of plain concrete. The results also showed that the use of recycled aggregates in HVGGBFS concrete can significantly reduce workability. However, the compressive strength is higher than when natural aggregates are used due to the alkali activation effect caused by the recycled aggregates. The compressive strength at 7 and 28 days increased by 33.7% and 16.3%, respectively.

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Dynamic tensile properties of steel fiber reinforced polyethylene fiber-engineered/strain-hardening cementitious composites (PE-ECC/SHCC) at high strain rate

Huo

Liu

et al. 2023

Cement and Concrete Composites

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Mechanical properties and its reliability prediction of engineered /strain-hardening cementitious composites (ECC/SHCC) with different moisture contents at negative temperatures

Cited by 28 publications

References 37 publications

Carbon nanotubes-coated cement particles for cement-based sensors with excellent piezoresistivity

Carbon nanotubes-coated cement particles for cement-based sensors with excellent piezoresistivity

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Dynamic tensile properties of steel fiber reinforced polyethylene fiber-engineered/strain-hardening cementitious composites (PE-ECC/SHCC) at high strain rate

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