Effect of the hydration temperature on the microstructure of Class G cement: C-S-H composition and density

Bahafid, Sara; Ghabezloo, Siavash; Duc, Myriam; Faure, Paméla; Sulem, Jean

doi:10.1016/j.cemconres.2017.02.008

Cited by 177 publications

(64 citation statements)

References 62 publications

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“…Drying of the hcp induces microstructural reorganization (Tomes et al 1957;Hunt et al 1960;Parrott et al 1980;Parrott and Young 1981;Litvan and Myers 1983;Völkl et al 1987;Maruyama et al 2014), densification of the C-S-H, and the development of larger pores. Our measurements indicate that temperature also has a similar impact on the microstructure of hcp, which can be observed in the hcp cured at elevated temperatures during the hydration process (Gallucci et al 2013;Bahafid et al 2017Bahafid et al , 2018 desorption, this microstructural reorganization, resulting from drying, is dominant compared to the reversible shrinkage (Helmuth and Turk 1967;Maruyama et al 2014Maruyama et al , 2015Maruyama et al , 2016aMaruyama et al , 2018a. Figure 8 presents a schematic of the proposed mechanism for the change in hcp shrinkage behavior.…”

Section: Discussionsupporting

confidence: 62%

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Maruyama

Rymeš

2019

ACT

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Short-term length-change isotherms and desorption isotherms of matured hardened cement paste were measured at different temperature conditions, namely, 20, 30, 40, 50, and 60°C. For the short-term length-change isotherms, higher temperature conditions resulted in a smaller drying shrinkage. This trend was largely controlled by the microstructural reorganization of the calcium-silicate-hydrates in the cement paste at elevated temperatures. The experimental results suggest that a portion of the evaporable water did not contribute to the shrinkage. In addition, based on the relationships between the incremental strain and the incremental evaporable water content, with a starting relative humidity of 5%, consistent trends were observed for the incremental strain and the incremental evaporable water when the incremental evaporable water content was less than 0.08 g/g-dried hcp. The microstructural reorganization pathways for elevated temperature and/or for drying were confirmed to be identical.

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Section: Discussionsupporting

confidence: 62%

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Maruyama

Rymeš

2019

ACT

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“…In this study, the main reason was the dehydroxylation of Ca(OH) 2 . The weight loss above 500 °C was due to the decomposition of CaCO 3 [21,22,23]. In the dehydration temperature range of C–S–H (105–300 °C), the weight loss of the three hydration batches was obvious.…”

Section: Resultsmentioning

confidence: 99%

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Shao

2018

Materials

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This paper presents a study on the carbonation reaction heat and products of tricalcium silicate (C3S) paste exposed to carbon dioxide (CO2) for rapid curing. Reaction heat was measured using a retrofitted micro-calorimeter. The highest heat flow of a C3S paste subject to carbonation curing was 200 times higher than that by hydration, and the cumulative heat released by carbonation was three times higher. The compressive strength of a C3S paste carbonated for 2 h and 24 h was 27.5 MPa and 62.9 MPa, respectively. The 24-h carbonation strength had exceeded the hydration strength at 28 days. The CO2 uptake of a C3S paste carbonated for 2 h and 24 h was 17% and 26%, respectively. The X-ray diffraction (XRD), transmission electron microscope coupled with energy dispersive spectrometer (TEM-EDS), and 29Si magic angle spinning–nuclear magnetic resonance (29Si MAS-NMR) results showed that the products of a carbonated C3S paste were amorphous silica (SiO2) and calcite crystal. There was no trace of calcium silicate hydrate (C–S–H) or other polymorphs of calcium carbonate (CaCO3) detected.

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“…To evaluate the hydration process of ordinary cement pastes and cement pastes with various TiO 2 nanoparticles under different curing temperatures, the nonevaporable water chemically bounded in hydration products was calculated to determine the degree of cement hydration at 3, 7, 28, and 56 days of curing [12,15]. A piece of cement paste was chosen and grinded into powder, and then, 2 g of this powder was dried at 105°C for 3 h until a constant weight was achieved; after that, the powder was ignited at 1000°C for 3 h, and then, the degree of hydration at a certain age can be calculated as the ratio of the nonevaporable water for paste cured at that age to the nonevaporable water for paste fully hydrated, as indicated in the following equation:…”

Section: Physical and Mechanical Propertymentioning

confidence: 99%

“…erefore, nanoparticles could be considered as an alternative choice to serve as accelerators for cementitious materials under low temperatures. Numerous studies have been conducted on the utilization of nanoparticles, including nano-SiO 2 [12][13][14][15][16][17][18][19][20][21][22], nano-CaCO 3 [17,23,24], nano-Al 2 O 3 [16,20,25], nano-TiO 2 [14,16,[26][27][28][29][30][31][32][33][34][35][36][37][38], nano-Fe 2 O 3 [10,13], and nano-CuO [13,39], in cementitious materials to improve their durability and mechanical properties. Nano-SiO 2 is the most commonly used nanoparticle, while nano-TiO 2 is comparatively favorable for pavement structures in terms of aircleaning property.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

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Low temperature negatively affects the engineering performance of cementitious materials and hinders the construction productivity. Previous studies have already demonstrated that TiO 2 nanoparticles can accelerate cement hydration and enhance the strength development of cementitious materials at room temperature. However, the performance of cementitious materials containing TiO 2 nanoparticles at low temperatures is still unknown. In this study, specimens were prepared through the replacement of cement with 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, and 5 wt.% TiO 2 nanoparticles and cured under temperatures of 0°C, 5°C, 10°C, and 20°C for specific ages. Physical and mechanical properties of the specimens were evaluated through the setting time test, compressive strength test, flexural strength test, hydration degree test, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) in order to examine the performance of cementitious materials with and without TiO 2 nanoparticles at various curing temperatures. It was found that low temperature delayed the process of cement hydration while TiO 2 nanoparticles had a positive effect on accelerating the cement hydration and reducing the setting time in terms of the results of the setting time test, hydration degree test, and strength test, and the specimen with the addition of 2 wt.% TiO 2 nanoparticles showed the superior performance. Refined pore structure in the MIP tests, more mass loss of CH in TGA, intense peak appearance associated with the hydration products in XRD analysis, and denser microstructure in SEM demonstrated that the specimen with 2 wt.% TiO 2 nanoparticles exhibited preferable physical and mechanical properties compared with that without TiO 2 nanoparticles under various curing temperatures.

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Effect of the hydration temperature on the microstructure of Class G cement: C-S-H composition and density

Cited by 177 publications

References 62 publications

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

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Effect of the hydration temperature on the microstructure of Class G cement: C-S-H composition and density

Cited by 177 publications

References 62 publications

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Temperature Dependency of Short-Term Length-Change and Desorption Isotherms of Matured Hardened Cement

Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

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Product

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Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures