Effect of Alkali Activators on Loess Geopolymer: Potential Waterproof Repair Material

Dassekpo, Jean-Baptiste Mawulé; Feng, Weipeng; Miao, Lixin; Dong, Zhijun

doi:10.1061/(asce)mt.1943-5533.0003784

Cited by 7 publications

(2 citation statements)

References 42 publications

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“…However, the present research on CG-based geopolymers is mainly focused on calcination temperature, particle size, or the mixing materials for the precursors. In addition, alkali activators, which are essential in determining the composition and mechanical properties, significantly influence the performance of geopolymers [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Geopolymerization of Coal Gangue via Alkali-Activation: Dependence of Mechanical Properties on Alkali Activators

Wang,

Liu,

Pan

et al. 2024

Buildings

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Coal gangue (CG) is a residual product from coal mining and washing processes. The reutilization of CG to produce geopolymers is a low-carbon disposal strategy for this material. In this study, the calcined CG (CG700°C) was used as aluminosilicate precursors, and the effects of alkali activators (i.e., Na2SiO3/NaOH, NaOH concentration, and liquid–solid) on the mechanical characteristics and microstructure of CG700°C-based geopolymers were investigated. The findings indicated that the specimens with a liquid–solid ratio of 0.50 (G2.0-10-0.50) exhibited a compact microstructure and attained a compressive strength of 24.75 MPa. Moreover, increasing the Na2SiO3/NaOH mass ratio has shortened the setting times and facilitated geopolymer gel formation, resulting in a denser microstructure and improved compressive strength. The higher NaOH concentrations of alkali activators facilitated the dissolution of CG700°C particles, and the geopolymerization process was more dependent on the condensation of SiO4 and AlO4 ions, which promoted the formation of geopolymer networks. Conversely, an increase in the liquid–solid ratio from 0.50 to 0.65 had a negative impact on compressive strength enhancement, impeding the polycondensation rate. Examination through scanning electron microscopy and mercury intrusion porosimetry revealed that employing a lower Na2SiO3/NaOH mass ratio (G1.2-10-0.55), smaller NaOH concentrations (G2.0-8-0.55), and a higher liquid–solid ratio (G2.0-10-0.65) led to the presence of larger pores, resulting in decreased 28 days compressive strength values (15.87 MPa, 13.25 MPa, and 14.92 MPa, respectively), and a less compact structure. The results suggest that the performance of CG700°C-based geopolymers is significantly influenced by alkali activators.

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Section: Introductionmentioning

confidence: 99%

Geopolymerization of Coal Gangue via Alkali-Activation: Dependence of Mechanical Properties on Alkali Activators

Wang,

Liu,

Pan

et al. 2024

Buildings

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“…erefore, in order to change the status quo of large but not strong Chinese ceramic industry and improve the status of Chinese ceramic industry in the world, it is necessary to improve the production of high-quality ceramics technology research and development ability and the production of advanced ceramic material technology research and development ability, which is the basis and key to produce high-grade ceramic products [4,5]. e premise of improving the research and development of high-quality ceramic materials is to strengthen the experimental analysis of ceramic materials [6].…”

Section: Introductionmentioning

confidence: 99%

Crack Repair Model of Ancient Ceramics Based on Digital Image

Fang

2022

Scientific Programming

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Ancient ceramics is an important carrier of concretization and artistic transformation of Traditional Chinese culture. It is also an extremely indispensable link for the world to understand traditional Chinese culture. It is of great significance to ensure the quality of ceramic products and improve the reliability of products by nondestructive testing of ceramic microdefect cracks. It is necessary to extract the microdefect crack area first and describe the characteristics of the ceramic crack image with the gradient weighting feature of the model to complete the nondestructive detection of the crack image. The traditional method sets the pixel point and brightness threshold according to the pixel value of the microdefect area but ignores the description of the weighted feature of the image and completes the nondestructive detection of the microdefect crack image of ceramic products. In this study, the improved algorithm of edge detection based on cluster analysis was applied to the ancient ceramic crack repair. First, cluster analysis is used to optimize the Sobel operator in edge detection. Then, the gray value distribution of edge detection map is changed by the Clustering algorithm. Finally，the experimental results show that the contour crack trace and edge direction of the improved edge detection map are obviously enhanced by 20%, which is beneficial to improve the accuracy of ancient ceramic crack repair.

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Alkali-activation of calcined granitic waste: Reaction mechanisms and environmental implication for waste minimization

Dassekpo

Zhang

Bai

et al. 2022

Construction and Building Materials

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Effect of Alkali Activators on Loess Geopolymer: Potential Waterproof Repair Material

Cited by 7 publications

References 42 publications

Geopolymerization of Coal Gangue via Alkali-Activation: Dependence of Mechanical Properties on Alkali Activators

Geopolymerization of Coal Gangue via Alkali-Activation: Dependence of Mechanical Properties on Alkali Activators

Crack Repair Model of Ancient Ceramics Based on Digital Image

Alkali-activation of calcined granitic waste: Reaction mechanisms and environmental implication for waste minimization

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