Influence of Microcrystalline AH3 Content on Properties of High-Alkali Carboaluminate Cementitious Materials
To investigate the impact of microcrystalline aluminum hydroxide gel(AH3)content on the properties of high-alkali carboaluminate cementitious materials,a composite activation scheme was designed using a co-mixed solution of sodium hydroxide,aluminum hydroxide and a sodium aluminate solution,to activate limestone powder.The results indicate that as the proportion of sodium aluminate solution in the activator mixture increases from 0%to 100%,the content of monocarboaluminate in the matrix remains relatively stable,while the content of microcrystalline AH3 progressively increases and the content of gibbsite correspondingly decreases.The average crystallite size of microcrystalline AH3 is approximately 19.5 nm,which is significantly smaller than the median particle size of 5.82 μm for gibbsite,thus endowing it with a larger specific surface area and superior cementitious properties.With the increase of microcrystalline AH3 content,the proportion of gel pores in the matrix increases,resulting in a more compact pore structure.Furthermore,there is a linear positive correlation between compressive strength of samples and the content of microcrystalline AH3,suggesting that higher content of microcrystalline AH3 correlates with greater strength of samples.
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