Effect of addition of silica- and amine functionalized silica-nanoparticles on the microstructure of calcium silicate hydrate (C–S–H) gel

Monasterio, Manuel; Gaitero, Juan J.; Erkizia, Edurne; Bustos, Ana Guerrero; Miccio, Luis A.; Dolado, Jorge S.; Cerveny, Silvina

doi:10.1016/j.jcis.2015.02.066

Cited by 76 publications

(16 citation statements)

References 54 publications

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“…The highest degree of polymerization of 1.43 and a chain length of 3.50 were observed with hardened cement paste incorporating 1% nanosilica. Similar chain length for the synthetic C–S–H without nanoparticles and the tendency to increase chain length was also shown by adding nanoparticles [41]. …”

Section: Resultssupporting

confidence: 58%

“…The NMR spectra were deconvoluted and the corresponding Q n intensities were presented in Table 2 with the average degree of C–S–H connectivity D c in Equation (5) and the C–S–H chain length l in Equation (6). It is noticeable that although some types of nanoparticles show the resonance of Q 3 due to the isolated silanol groups and Si–O–Si bond in nanoparticles [41], Q 3 was not shown for the nanosilica powder used in this study. The highest degree of polymerization of 1.43 and a chain length of 3.50 were observed with hardened cement paste incorporating 1% nanosilica.…”

Section: Resultsmentioning

confidence: 93%

See 1 more Smart Citation

Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

Moon

Taha

Youm³

et al. 2016

Materials

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The incorporation of pozzolanic materials in concrete has many beneficial effects to enhance the mechanical properties of concrete. The calcium silicate hydrates in cement matrix of concrete increase by pozzolanic reaction of silicates and calcium hydroxide. The fine pozzolanic particles fill spaces between clinker grains, thereby resulting in a denser cement matrix and interfacial transition zone between cement matrix and aggregates; this lowers the permeability and increases the compressive strength of concrete. In this study, Ordinary Portland Cement (OPC) was mixed with 1% and 3% nanosilica by weight to produce cement pastes with water to binder ratio (w/b) of 0.45. The specimens were cured for 7 days. 29Si nuclear magnetic resonance (NMR) experiments are conducted and conversion fraction of nanosilica is extracted. The results are compared with a solid-state kinetic model. It seems that pozzolanic reaction of nanosilica depends on the concentration of calcium hydroxide.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 93%

Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

Moon

Taha

Youm³

et al. 2016

Materials

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“…This change in the temperature dependence of the relaxation time has previously been observed for water confined in different confining systems and extensively debated in a previous publication 33 . In the case of synthetic C-S-H gel 34 , this crossover was related to confinement sizes of 1 nm. Moreover, the relaxation time of process 3 is independent of the w / c ratio (i.e.…”

Section: Resultsmentioning

confidence: 98%

Dynamics of nano-confined water in Portland cement - comparison with synthetic C-S-H gel and other silicate materials

Goracci

Monasterio

Jansson

et al. 2017

Sci Rep

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The dynamics of water confined in cement materials is still a matter of debate in spite of the fact that water has a major influence on properties such as durability and performance. In this study, we have investigated the dynamics of water confined in Portland cement (OPC) at different curing ages (3 weeks and 4 years after preparation) and at three water-to-cement ratios (w/c, 0.3, 0.4 and 0.5). Using broadband dielectric spectroscopy, we distinguish four different dynamics due to water molecules confined in the pores of different sizes of cements. Here we show how water dynamics is modified by the evolution in the microstructure (maturity) and the w/c ratio. The fastest dynamics (processes 1 and 2, representing very local water dynamics) are independent of water content and the degree of maturity whereas the slowest dynamics (processes 3 and 4) are dependent on the microstructure developed during curing. Additionally, we analyze the differences regarding the water dynamics when confined in synthetic C-S-H gel and in the C-S-H of Portland cement.

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“…ppm, while in sample CSH 4w the last one shifted to -79.6 ppm and another one appeared at -83.7 ppm [25]. The intensity of Q 1 bands decreases as the C-S-H gel is maintained in its solution, whilst the Q 2 band experiences a large increase, which leads us to think that the microstructure of C-S-H gel is changing.…”

Section: Dta/tg/ms Characterizationmentioning

confidence: 86%

CO2 adsorption on calcium silicate hydrate gel synthesized by double decomposition method

Martin-Garrido

Martínez-Ramírez

2020

J Therm Anal Calorim

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The calcium silicate hydrate gel (C-S-H) was synthesized by the double decomposition method because of the simplicity and the quickness of the procedure. The structure of the C-S-H gels after 1 week and 4 weeks in contact with the formation solution was studied through Micro-Raman, Fourier Transformed Infrared Spectroscopy and 29 Si Nuclear Magnetic Resonance. Simultaneous thermodifferential-thermogravimetric analysis and mass spectrometry (DTA/TG/MS) was used to identify the amount of calcium carbonate formed due to the reaction between the calcium and atmospheric CO 2. With DTA/TG/MS, mass loss due to CO 2 was observed to take place at temperatures below 400ºC, unidentified to date, which might be associated with the CO 2 adsorbed on the C-S-H gel. Thus, in the TG analysis in the 300-430ºC range, both the loss of water due to the decomposition of the amorphous calcium carbonate (ACC) and the loss of CO 2 adsorbed on the gel must be considered. Additionally, polymerization of the gel and a decrease in the Ca/Si ratio was observed from the samples from 1 to 4 weeks.

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Effect of addition of silica- and amine functionalized silica-nanoparticles on the microstructure of calcium silicate hydrate (C–S–H) gel

Cited by 76 publications

References 54 publications

Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

Dynamics of nano-confined water in Portland cement - comparison with synthetic C-S-H gel and other silicate materials

CO2 adsorption on calcium silicate hydrate gel synthesized by double decomposition method

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