Hydration of the silica fume-Portland cement binary system at lower temperature

Liu, Jun; Yao, Li; Ouyang, Peng; Yang, Yuanquan

doi:10.1016/j.conbuildmat.2015.05.069

Cited by 41 publications

(8 citation statements)

References 24 publications

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“…One example of this application is silica fume, one of the mineral additions that are most widely used in construction and building since the 1970s and that remains the focus of research due to its high reactivity [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Performance of Portland cement pastes containing nano-silica and different types of silica

Flores

Cordeiro

Filho

et al. 2017

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Performance of Portland cement pastes containing nano-silica and different types of silica

Flores

Cordeiro

Filho

et al. 2017

Construction and Building Materials

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“…Thus, strategies in early ages should be applied to avoid the damages in matrix under cold weathers [13,14]. To this end, a lot of studies were conducted to learn the Portland cement hydration under low temperatures [10,11,[15][16][17][18], even though there is still lack of understanding in depth to the low temperature effects on cement hydration and hardening characteristics.…”

Section: Introductionmentioning

confidence: 99%

Portland Cement Hydration Behavior at Low Temperatures: Views from Calculation and Experimental Study

Liu

Jiao

Sha

et al. 2017

Advances in Materials Science and Engineering

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Environmental condition affects the property of construction materials. This study gives an initial understanding of Portland cement hydration under low temperatures from the views of laboratory experiments (including electrical resistivity, degree of hydration (DoH), and maturity) as well as thermodynamic calculation. The hydrates of Portland cement at the given period were detected with X-ray diffraction (XRD), and their microstructure was observed by scanning electron microscope (SEM). Experiment result (i.e., DoH and electrical resistivity) indicated that the hydration of Portland cement was delayed by low temperature without hydration stopping at −5 ∘ C. Based on a basic kinetics model, the thermodynamic calculation predicted that the final hydrate differs in dependence on environmental temperatures. The mechanical behavior trend of Portland cement paste affected by low temperatures potentially is linked to the appearing of aluminate compounds and reduction of portlandite.

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“…erefore, the addition of silica fume reduced the content of Ca(OH) 2 in the paste, and the macropore was replaced by the small pore, which reduced the most probable pore size and specific surface area, reduced the porosity, and improved the compactness of the structure. Macroscopically, the strength, impermeability, and frost resistance of cement with the addition of silica fume were improved [24].…”

Section: Calculation and Analysis Of Leaching Resistance Coefficientmentioning

confidence: 99%

XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water

Zhang

Zhou

et al. 2020

Advances in Civil Engineering

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In order to study the leaching characteristics of hardened cement paste by flowing environmental water, indoor simulated leaching tests of Portland cement paste were carried out at different flow velocities with home-made flow field device and tap water as the erosion medium. By means of mechanical properties tests, X-ray diffraction (XRD), and Rietveld full-spectrum quantitative analysis of specimens after leaching at different ages, the change rules of the flexural strength, main phase composition, and mass fraction of the specimens after leaching were obtained. The results show that, within 90 days, the flow rate in the test has no obvious effect on the leaching of hardened cement paste. With the increase in age, the leaching of hardened cement paste gets more obvious. Rietveld full-spectrum quantitative analysis shows that the leaching of hardened cement paste changes with the relative content of CaCO3 and Ca(OH)2. The higher the relative content of CaCO3 is, the better compaction and leaching resistance the paste has. The leaching resistance of hardened cement paste is also related to the gradient of Ca(OH)2. The smaller the gradient is, the better the leaching resistance is. The Rietveld full-spectrum quantitative analysis method can be used as a method to evaluate the leaching effect of hardened cement paste.

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Hydration of the silica fume-Portland cement binary system at lower temperature

Cited by 41 publications

References 24 publications

Performance of Portland cement pastes containing nano-silica and different types of silica

Performance of Portland cement pastes containing nano-silica and different types of silica

Portland Cement Hydration Behavior at Low Temperatures: Views from Calculation and Experimental Study

XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water

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