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研究了化学激发剂对粉煤灰—水泥—水胶凝体系pH值的影响。碱掺入后初始pH值低于13.15;掺NaOH的pH值随粉煤灰掺量的增加而减小,随自身掺量增加而增大;而掺Ca(OH)2的pH值变化较小。掺Na2SO4的pH值较高,但也要到7天才能达到13.15,且随粉煤灰掺量的增加而减小,随自身掺量的增加而增大;而掺CaSO4.2H2O时pH值受本身掺量和粉煤灰掺量影响不大。掺入CaCl2后pH值较低,且随着粉煤灰和CaCl2掺量的增加而降低。当激发剂复掺时初始pH值都高于它们各自单掺时的pH值,3天后水泥的水化逐渐占据主导地位,7天至28天随着粉煤灰掺量的增大,pH值降低的幅度也越明显。
The effect of chemical activator on the pH value of fly ash-cement-water gelling system was studied. The initial pH value of NaOH-doped NaOH solution was lower than 13.15. The pH value of NaOH-doped NaOH solution decreased with the increase of fly ash content and increased with the increase of its content. However, the pH value of Ca (OH) 2- . The pH value of doped Na2SO4 is higher, but it also reaches 13.15 in 7 days, and decreases with the increase of the content of fly ash, which increases with the increase of the content of fly ash. However, when pH value is affected by CaSO4.2H2O Dosage and fly ash content of their own little influence. After adding CaCl2, the pH value was lower and decreased with the increase of the content of fly ash and CaCl2. When the initial pH value of the complexing agent is higher than the pH value of each of them, the hydration of the cement gradually dominates after 3 days. With the increase of the fly ash content, the pH value The extent of reduction is also more obvious.