Creep behavior of C-S-H under different drying relative humidities: Interpretation of microindentation tests and sorption measurements by multi-scale analysis

Suwanmaneechot, Piyapong; Aili, Abudushalamu; Maruyama, Isao

doi:10.1016/j.cemconres.2020.106036

Cited by 79 publications

(28 citation statements)

References 52 publications

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“…The highest derivative peak in the differential pore size distribution increased sharply when the temperature reached 50 °C. The results in Figure 3 also give evidence for the coarsening of the pore structure, in good agreement with the findings of Suwanmaneechot et al [38] and Jennings [39]. The main cause of coarsening of the pore structure is the nanostructure change of C-S-H at the drying temperature, according to Aono et al [23].…”

Section: Results For Pore Structure Change Due To Environmental Condisupporting

confidence: 89%

Distribution Map of Frost Resistance for Cement-Based Materials Based on Pore Structure Change

Quy

Noguchi

et al. 2020

Materials

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This paper presents a prediction method and mathematical model based on experimental results for the change in pore structure of cement-based materials due to environmental conditions. It focuses on frost damage risk to cement-based materials such as mortar. Mortar specimens are prepared using water, ordinary Portland cement, and sand and the pore structure is evaluated using mercury intrusion porosimetry. New formulas are proposed to describe the relationship between the pore structure change and the modified maturity and to predict the durability factor. A quantitative prediction model is established from a modified maturity function considering the influences of environmental factors like temperature and relative humidity. With this model, the frost resistance of cement-based materials can be predicted based on weather data. Using the prediction model and climate data, a new distribution map of frost damage risk is created. It is found that summer weather significantly affects frost resistance, owing to the change in pore structure of cement-based mortar. The model provides a valuable tool for predicting frost damage risk based on weather data and is significant for further research.

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Section: Results For Pore Structure Change Due To Environmental Condisupporting

confidence: 89%

Distribution Map of Frost Resistance for Cement-Based Materials Based on Pore Structure Change

Quy

Noguchi

et al. 2020

Materials

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“…The change in mechanical response due to irradiation of the C-S-H samples is not clear; other factors, such as the water content of the samples, appear to provide enough variability that the statistical analysis is not conclusive on the effect of irradiation on mechanical response. Literature indicates that water content of C-S-H can play a significant role in the mechanical behavior of C-S-H (Maruyama et al 2014;Suwanmaneechot et al 2020). In the current study, C-S-H was conditioned to 11% RH prior to compaction and irradiation, but relative humidity was not controlled after irradiation.…”

Section: Resultsmentioning

confidence: 99%

Examination of Gamma-irradiated Calcium Silicate Hydrates. Part II: Mechanical Properties

Hunnicutt

Rodriguez

Mondal

et al. 2020

ACT

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Mechanical properties of calcium silicate hydrates (C-S-H) with C/S ratios of 0.75, 1, and 1.33 were examined with nanoindentation after gamma-adsorbed doses of 0.145, 0.280, 0.500, and 0.784 MGy, and were compared with control samples. Young's modulus and stress relaxation tests showed no apparent trend with irradiation dose. Qualitatively, most of the irradiated samples were found to relax more than their respective controls, but not always in a statistically significant manner. Most of the Young's modulus irradiated-control pairs showed marginally higher stiffness in the irradiated samples, but overall trends with irradiation dose were not obvious. Creep compliance was obtained for the samples irradiated at the highest dose and their respective controls. Two of the three irradiated samples exhibited less creep than their respective controls, but only one of which was statistically significant. The lack of clear changes in mechanical properties for these samples correlates with separate chemical analyses that showed no loss of interlayer water by exposure to irradiation or changes in the mean silicate chain length. Further research evaluating higher doses (25 and 200 MGy) representative of those received by concrete structures in nuclear power plants at prolonged operation is being carried out to complement the present study.

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“…4 Relationship between normalized water vapor BET surface area and equilibrium RH for the low-heat Portland cement (L) and high early-strength Portland cement (H) specimens. The data are from (Suwanmaneechot et al 2020). The low heat Portland cement used here is not the same as that shown in Figs.…”

Section: Discussionmentioning

confidence: 99%

The Relative Humidity Range for the Development of Irreversible Shrinkage in Hardened Cement Paste

Maruyama

Kishi²,

Aili

2021

ACT

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For better understanding of irreversible shrinkage, nine hardened cement paste (hcp) samples with three different cement types and three different water to cement ratio were prepared. Four different relative humidity conditioning histories containing the first desorption, re-humidification and the second desorption are investigated for all the specimens to obtain the length change and water sorption isotherms. The irreversible shrinkage strain was developed when the specimen was dried up to less than 80% relative humidity (RH), while other previous experiments in literatures showed that the shrinkage strain between 40% RH and 11% RH is reversible. It is concluded that the irreversible shrinkage strain is developed between 80% RH and 40% RH, which is also supported by the change in water vapor BET surface area of hardened cement paste after long-term drying.

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Creep behavior of C-S-H under different drying relative humidities: Interpretation of microindentation tests and sorption measurements by multi-scale analysis

Cited by 79 publications

References 52 publications

Distribution Map of Frost Resistance for Cement-Based Materials Based on Pore Structure Change

Distribution Map of Frost Resistance for Cement-Based Materials Based on Pore Structure Change

Examination of Gamma-irradiated Calcium Silicate Hydrates. Part II: Mechanical Properties

The Relative Humidity Range for the Development of Irreversible Shrinkage in Hardened Cement Paste

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