New insights into the early-age reaction kinetics of metakaolin geopolymer by 1H low-field NMR and isothermal calorimetry

Liang, Guangwei; Yao, Wu; She, Anming

doi:10.1016/j.cemconcomp.2023.104932

Cited by 54 publications

(6 citation statements)

References 79 publications

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“…Generally, the change of pore volume is related to the development of gel pores and capillary pores. The pores registered within 10 nm are defined as gel pores, whereas those with the pore size >10 nm are described as capillary pores 48 . As the calcination temperature increased, holes less than 10 nm first increased and then decreased, which also explained the change in compressive strength.…”

Section: Resultsmentioning

confidence: 99%

“…The pores registered within 10 nm are defined as gel pores, whereas those with the pore size >10 nm are described as capillary pores. 48 As the calcination temperature increased, holes less than 10 nm first increased and then decreased, which also explained the change in compressive strength. Figure 13 is obtained by calculating the data in Figure 12.…”

Section: Mip Analysismentioning

confidence: 88%

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Preparation of granite powder–based geopolymer by synergistic action of calcination and phosphoric acid

Jia,

Huang,

Huang

et al. 2023

J Am Ceram Soc.

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Using the solid waste of granite powder (GP) to prepare green cementitious materials is of great significance for the sustainable development of the construction industry. In this study, a phosphoric acid–based geopolymer (PABG) was directly prepared from GP through a combination of phosphoric acid and calcination processes. Reaction mechanism of phosphoric‐activated GP is studied by techniques of X‐ray diffraction, thermal analysis, Fourier transform infrared spectroscopy, SE mode, and mercury intrusion porosimetry (MIP) taking calcination temperature, calcination time, and phosphoric acid as variables. The results indicated that the addition of 15 wt.% phosphoric acid and calcination at the temperature of 200°C for 90 min significantly increased compressive strength from 0.70 to 20.92 MPa. The calcination temperature was the most important factor in the synthesis of PABG using GP. The decrease of the peak value of mineral phase after calcination indicates that high temperature promotes the reaction between phosphoric acid and GP. According to the results of MIP, the gel generated by the reaction of phosphoric acid and GP refines the pore structure, which is conducive to the improvement of geopolymer properties. These research results provide a reference for the preparation of geopolymers directly using low pozzolanic active GP.

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Section: Resultsmentioning

confidence: 99%

Section: Mip Analysismentioning

confidence: 88%

Preparation of granite powder–based geopolymer by synergistic action of calcination and phosphoric acid

Jia,

Huang,

Huang

et al. 2023

J Am Ceram Soc.

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“…The JMAK model was also used to determine the geopolymerization kinetics which described the kinetics of geopolymer prepared using numerous activators as a one-dimensional diffusion-controlled reaction and its rate of reaction slightly decreased at higher alkalinity due to the presence of various soluble species and more reaction products. 81 This method provided valuable information about geopolymerization kinetics, and it was proved that both techniques can be used mutually to determine the geopolymerization kinetics of metakaolin based geopolymers.…”

Section: Geopolymerization Kineticsmentioning

confidence: 99%

A comprehensive review of synthesis kinetics and formation mechanism of geopolymers

Siyal,

Radin Mohamed,

Shamsuddin

et al. 2024

RSC Adv.

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“…The simulations were conducted using LAMMPS software (https://www.lammps.org/, accessed on 4 December 2023), with the CVFF force field applied to each model system for energy minimization and subsequently for molecular dynamics until equilibrium was achieved. The simulations were performed in the NVT ensemble at a temperature of 298 K [25][26][27][28]. To ensure sufficient interaction between the polymer and the CSH, an equilibration time of 4 ns was chosen, during which the trajectories of all atoms were collected for further structural and dynamic analysis.…”

Section: Force Fieldmentioning

confidence: 99%

Molecular Dynamics Simulation of Silane Inserted CSH Nanostructure

Yang,

Cui,

She

et al. 2023

Materials

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Herein, the toughening mechanism and effects of 3-(aminopropyl)triethoxysilane (3-APTES) intercalation in calcium–silicate–hydrate (CSH) structures were investigated through molecular dynamics simulations. CSH established a model using 11 Å-tobermorite to simulate the tensile properties, toughness, adsorption energy, average orientation displacement and radial distribution function of 3-APTES intercalation at different Ca/Si ratios under conditions of a CVFF force field, an NVT system, and 298 K temperature. Simulation results demonstrate that 3-APTES alters the fracture process of CSH and effectively enhances its tensile properties and toughness. The presence of 3-APTES molecules increases the energy required to destroy CSH, thereby increasing the adsorption energy of CSH crystals. Furthermore, 3-APTES molecules effectively increase the atom density within the CSH structure. As the Ca/Si ratio increases, Ca–O bond formation is enhanced, with noticeable aggregation occurring because of modification by 3-APTES within the CSH structure. This study found that 3-APTES organic compounds can effectively improve the tensile, toughness, adsorption and other properties of the CSH structure, and further improve the microstructure of CSH.

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New insights into the early-age reaction kinetics of metakaolin geopolymer by 1H low-field NMR and isothermal calorimetry

Cited by 54 publications

References 79 publications

Preparation of granite powder–based geopolymer by synergistic action of calcination and phosphoric acid

Preparation of granite powder–based geopolymer by synergistic action of calcination and phosphoric acid

A comprehensive review of synthesis kinetics and formation mechanism of geopolymers

Molecular Dynamics Simulation of Silane Inserted CSH Nanostructure

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