Morphological Differentiation and Crystal Growth Form of Friedel’s Salt Originated from Pozzolan and Portland Cement

Talero, R.; Trusilewicz, Lidia Natalia

doi:10.1021/ie301671z

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Furthermore, the UCS values of AS stabilized X2, which have the highest salinity and chloride content of the four samples, are about four times higher than those of the sample stabilized by PC P6. These results indicate that AS is more effective than PC P6 for stabilizing chloride saline soil (Talero and Trusilewicz, 2012). At the same time, the UCS values of the DS samples stabilized by AS are lower than those of the corresponding soil samples obtained from sites; however, the UCS values of the DS samples stabilized by PC P6 are higher than those of the corresponding soil samples.…”

Section: Ucs Of Stabilized Soilmentioning

confidence: 74%

Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil

Yin

Zhu

et al. 2016

J. Zhejiang Univ. Sci. A

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Saline soil stabilization is being increasingly applied in foundation treatment engineering. Chloride saline soil obtained from sites and laboratory-made chloride soil (ZS) with various NaCl concentrations prepared artificially were stabilized using alkali-activated slag (AS). A series of unconfined compressive strength (UCS) tests, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDXA), thermal gravity-differential thermal gravity (TG-DTG), and ion concentration tests were conducted to investigate the strength variation and mechanism of the AS-stabilized chloride saline soils. The results showed that NaCl has a significant influence on the strength of AS-stabilized chloride saline soil and the strength of AS-stabilized ZS (GZS) increases with increase of chloride content in soil samples. Friedel's salt (Fs) and NaOH are generated by the reaction of NaCl and CaO·Al 2 O 3 (CA) in the slag in the GZS. Fs can fill the pores in stabilized soil, and NaOH can promote calcium silicate hydrate (CSH) generation. These two effects combine to enhance the strength of GZS. The relationship between the rate of increase of 28-d UCS of AS-stabilized chloride saline soil and the chloride content in soil was obtained through regression analysis of the increase of UCS of GZS.

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Section: Ucs Of Stabilized Soilmentioning

confidence: 74%

Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil

Yin

Zhu

et al. 2016

J. Zhejiang Univ. Sci. A

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“…Some authors concluded that low salt concentrations accelerate the hydration process and high salt concentrations retard the process 1,3 . The Friedel's salt formation in cement pastes containing NaCl is also reported 1, 4,12,13 . The thermal analysis has been used as a tool to analyze the products hydrated formed in cement pastes containing salts 1, 3,10 .…”

Section: Introductionmentioning

confidence: 91%

Evaluation of Influence of Salt in the Cement Hydration to Oil Wells

et al. 2018

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The influence of NaCl salt in the hydration of the Portland cement paste class G was studied using a Non Conventional Differential Thermal Analysis (NCDTA) on the first 24 hours of cement hydration. The mass of salt used corresponds to 0, 5, 10, 15 and 20% of mass of water used in the preparation of the pastes. The water/cement ratio (w/c) remained constant, being 0.46, and the pastes final volume was 99.9mL. Applying a deconvolution method to separate overlapped NCDTA peaks it was possible to estimate the energy released during the different stages of hydration and the effect of salt in cement hydration process. The presence of up to 10% of salt accelerated the hydration process and increased the hydration of C 3 S and C 3 A, while the 20% of the salt causes a delayed hydration and decreased the hydration of C 3 S and C 3 A. Futhermore, cement pastes with the same percentages of NaCl and with different hydration times were evaluated by Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and Differential Thermal Analysis (DTA). After 28 days the presence of salt caused a greater increase in the formation of hydrated products.

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“…Friedel's salt, as a chloride-containing AFm phase, can be formed by the chemical reaction between chloride and some AFm phases like monosulfoaluminate, monocarboaluminate and hemicarboaluminate (Sui et al, 2019). In addition, AFm phases also belong to the lamellar double hydroxide family exhibiting typical hexagonal platelets morphology, and previous works also confirmed that Friedel's salt crystallizes in a hexagonal manner with a particle size of several microns (Birnin-Yauri and Glasser, 1998;Li et al, 2017a;Talero and Trusilewicz, 2012). This largesize and hexagon-like Friedel's salt crystals might have a lower hardness, and grow with a higher porosity, as shown in Figure 10.…”

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confidence: 90%

Mechanism of strength evolution of seawater OPC pastes

Zhang

Sun

Zheng

et al. 2021

Advances in Structural Engineering

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This work investigated the strength degradation mechanisms of seawater ordinary Portland cement (OPC) pastes. Two types of specimens were prepared ((i) OSD sample (i.e. OPC was mixed with seawater, and then cured in deionized (DI) water) and (ii) ODD sample (i.e. OPC was mixed with DI water, and then cured in DI water, as the reference system)). The use of seawater in preparing OPC pastes effectively increased the hydration rate and early-age mechanical strength, but lowered the mechanical strength at the later age. The higher hydration degree and larger amounts of carbonates with a smaller crystal size enabled the seawater OPC pastes to exhibit a higher early-age mechanical strength, increasing by 13.0%–17.0% compared with the DI water OPC pastes. While the formation of Friedel’s salt and the formation of calcium-silicate-hydrate (C-S-H) gel with a lower polymerization degree and mean molecular chain length resulted in the deterioration of the pore structure and negatively affected the later-age strength development of the seawater OPC paste, decreasing by 5.8%–11.9% compared with the DI water OPC pastes.

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Morphological Differentiation and Crystal Growth Form of Friedel’s Salt Originated from Pozzolan and Portland Cement

Cited by 5 publications

References 24 publications

Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil

Laboratory investigation of the strength development of alkali-activated slag-stabilized chloride saline soil

Evaluation of Influence of Salt in the Cement Hydration to Oil Wells

Mechanism of strength evolution of seawater OPC pastes

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