Microstructure of geopolymer accounting for associated mechanical characteristics under various stress states

Correlating the elastic properties of metakaolin-based geopolymer with its composition

“…Si/Al ratio (silicate content or Ms level in this study) and the mechanical strength could be found extensively, such as, Cheng et al, [25,26] Pelisser et al [37] and Ozer and Soyer-Uzun [38]. In some studies (e.g., [5,27,39,40]), a negative effect of a high Ms level on mechanical strength was also reported. The reasons for the weakening effect of the high Ms level on the compressive strength can be the poor workability of the geopolymer pastes due to the viscous nature of the sodium-silicate solution [27] and the inhibition effect of the high amount of the sodium-silicate solution on the geopolymerization process [41].…”

Permeation characteristics and impact factors of geopolymers made of kaolin

“…Lyu et al [28][29] investigated the main factors that affect the mechanical characteristics of geopolymers and found that using a higher concentration of OH À (M) in their preparation resulted in greater uniaxial compressive strength. Results of SEM and NMR experiments indicated that preparing a geopolymer with a high OH À concentration helps to destroy the AlO 6 structure in metakaolin and so favor the dissolution of Al ions, promoting the polymerization of AiO 4 and SiO 4 ; producing a three-dimensional Si-O-Al framework structures of the geopolymer with a microstructurally smooth surface and a high Q 4 (4Al) percentage.…”

“…Lyu et al [28][29] noted that the mechanical characteristics of geopolymers made of kaolin are dominated by the proportions of constituent metakaolin, sodium silicate solution, sodium hydroxide, and water. In this study, these four factors are taken as independent variables in the design of experiments (DOEs) method; each factor has three levels -high, medium and low -in the preparation of the geopolymers whose hydraulic conductivity will be measured.…”

“…Based on the results of research on the mechanical characteristics of geopolymers [28][29], this study measures the hydraulic conductivity of geopolymers using an improved radial flow permeability device. The influence of the composition of the geopolymer on its permeation characteristics is investigated, and interactions between constituents are identified statistically.…”

Preparation, structure and properties of hybrid materials based on geopolymers and polysiloxanes

“…This shift could be attributed to a higher degree of polymerization of the samples cured at higher temperatures, resulting in an increase of the nominal Si/Al ratio in the specimens attributed to replacement of aluminum first cation neighbors with silicon more shielding nucleus [42][43][44][45].…”