Introduction of 5% of additives int

Introduction of 5% of additives into cement system
causes acceleration of hydration processes which is manifested
in shortening of induction period. Addition of pulverized
fly ash is the exception. In case of higher amount of
additives (25%), their influence is more diverse. The
accelerating action is displayed by both of fly ashes and
also by Portland cement. It may be influence of nucleation
action of additive fine grains, but also releasing of ions
securing high pH of environment (pH of water extract of
the additives is above 11). Na? and K? ions liberated from
the ashes as well as Ca2? from Portland cement and fluidized
fly ash may accelerate hydration of calcium aluminate
cement. Generally, acting of alkalis, coming, e.g. from
aggregate, depends on their concentration and temperature,
especially when arising products are considered. For
example, small concentration of K? ions may accelerate
hydration of cement and change mineralogical composition
of cement material [14].

結果 (英文) 2:

5%添加剂引入水泥体系的水化过程
原因主要表现
在诱导期缩短加速度。粉煤灰掺粉
是例外。在
添加剂的量较高的情况下（25%），其影响更为多样化。该
加速的动作显示由粉煤灰和
也由波特兰水泥。这可能是
成核的影响添加剂细化晶粒作用，而且释放的离子
保护环境高pH值（pH值
添加剂的水提取物在11以上）。Na？和K？离子从灰烬中解放
以及钙？波特兰水泥和粉煤灰流态化
可能会加速水泥水化铝酸钙
。一般来说，代碱，未来，从
骨料，取决于它们的浓度和温度，尤其是当出现产品被认为是
。为
例，低浓度的K？离子可以加速水泥水化和
改变水泥材料的矿物组成
[ 14 ]。