Effect of n-C-S-H-PCE and slag powder on the autogenous shrinkage of high-strength steam-free pipe pile concrete

Wang, Penggang; Fu, Hua; Zuo, Wenqiang; Luo, Shan; Zhao, Haitao; Pan, Feng; Wang, Hui

doi:10.1016/j.conbuildmat.2022.126815

Cited by 19 publications

(2 citation statements)

References 51 publications

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“…With the increase in curing time, the pozzolanic effect of FA occurs in secondary hydration, and the pore size is refined due to the increased hydration products with more stable morphology and strength. At the same time, the morphology effect and micro aggregate effect of FA can improve the strength of concrete [5,7,20,21,26].…”

Section: The Slump Of Concrete With Fcfa or Hdfamentioning

confidence: 93%

Effect of decarbonization of high carbon fly ash on workability, mechanical properties and durability of concrete

Zhu,

Fu,

Feng

et al. 2023

Mater Struct

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The carbon content of fly ash (FA) influences the performance of concrete. In this paper, the flotation decarburization treatment was carried out on high carbon fly ash (HCFA) to obtain flotation decarburized fly ash (FDFA). The effects of flotation decarbonization treatment of fly ash on workability, mechanical properties, chloride penetration, carbonation, and water/sulfate frost damage to concrete were systemically studied. The results indicated that flotation decarbonization treatment could remarkably reduce the water demand ratio and increase the intensity activity index of fly ash. Moreover, compared with HCFA, FDFA could better enhance the workability and increase the compressive strength of concrete. When the water-cement ratio is 0.43, and the fly ash content is 35%, the slump and 56 d compressive strength of concrete with FDFA were 60% and 23% greater than that of concrete with HCFA, respectively. Furthermore, FDFA could better improve the microstructure and the resistance to chloride penetration, carbonation, and freeze-thaw of concrete. When the water-cement ratio was 0.43 and fly ash content was 35%, the carbonation depth and chloride migration coefficient of concrete with FDFA were 69.95% and 17.24% lower than those of concrete with HCFA, respectively. In comparison to water freeze-thaw cycles, sulfate freeze-thaw cycles caused more damage to concrete. The critical value of the pore diameter for pore solution freezing (i.e., 14 nm) was proposed to illustrate the damage degree of freeze-thaw to concrete. A "frost-heaving-corrosion" composite failure theory was employed to explain the failure mechanism of concrete exposed to the sulfate freeze-thaw cycles.

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Section: The Slump Of Concrete With Fcfa or Hdfamentioning

confidence: 93%

Effect of decarbonization of high carbon fly ash on workability, mechanical properties and durability of concrete

Zhu,

Fu,

Feng

et al. 2023

Mater Struct

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“…Reinforced concrete structures play a significant role in the construction of infrastructures such as subsea tunnels, urban subways, and high-speed railways and are involved in the lives of millions of people [1]. When reinforced concrete structures are used in a corrosive environment (such as the ocean and saline soil), chloride ion erosion is the main cause of corrosion of steel bars and, ultimately, the deterioration of reinforced concrete structures [2,3]. A useful or practical way to reduce corrosion-induced damage is through prevention, such as real-time monitoring of the Cl − concentration in the environment and concrete.…”

Section: Introductionmentioning

confidence: 99%

Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar

Zhang,

Fu,

Tian

et al. 2024

Sensors

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A composite solid chloride sensor consisting of two single sensors, i.e., Ag/AgCl working electrode and Mn/MnO2 reference electrode, was developed. The Ag/AgCl electrode was prepared by the anodic polarization method, while the Mn/MnO2 reference electrode was prepared using the powder compaction technique. Then, the electrochemical performances such as stability, reproducibility, and sensitivity of the composite and single sensors were investigated in a saturated Ca(OH)2 solution and mortar specimen. A current density of 0.5 mA/cm2 and polarization time of 2.5 h were the optimal preparation parameters of the Ag/AgCl selective electrode. The Ag/AgCl selective electrode showed a linear potential response with the logarithm of chloride ion content in solution and had good stability, reproducibility, and anti-polarization performances. In addition, the Mn/MnO2 electrode exhibited potential stability after being activated in an alkaline solution for 60 days. The composite sensor demonstrated exceptional sensitivity to the Cl− content, boasting a slope of approximately 51.1 mV/decade, and showcased excellent stability in both solution and mortar specimens. In every measurement, the time needed for the potential of a composite sensor to become stable was less than 30 s. The sensor enables non-destructive in situ monitoring of the chloride ion content in cement mortar, thus realizing early warning of deterioration of reinforcement and guaranteeing long service life of the structure.

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Water loss and shrinkage prediction in 3D printed concrete with varying w/c and specimen sizes

Ma,

Jia,

Chen

et al. 2024

Cement and Concrete Composites

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Effect of n-C-S-H-PCE and slag powder on the autogenous shrinkage of high-strength steam-free pipe pile concrete

Cited by 19 publications

References 51 publications

Effect of decarbonization of high carbon fly ash on workability, mechanical properties and durability of concrete

Effect of decarbonization of high carbon fly ash on workability, mechanical properties and durability of concrete

Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar

Water loss and shrinkage prediction in 3D printed concrete with varying w/c and specimen sizes

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