Impact of activator chemistry on permeability of alkali-activated slags
Impact of activator chemistry on permeability of alkali-activated slags
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DOI：
10.1111/jace.14996
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发表时间：
2017-10
影响因子：
3.9
通讯作者：
A. Blyth;C. Eiben;G. Scherer;C. White
中科院分区：
文献类型：
--
作者：
A. Blyth;C. Eiben;G. Scherer;C. White
采用弯梁法测定了碱活性矿渣的渗透性，并对其耐久性进行了评价。该方法通过测量饱和固体膏体细长梁在三点弯曲状态下的水动力载荷松弛曲线，获得了渗透系数。考察了活化剂的选择对碱活化渣渗透性的影响以及水前驱物比的影响，表明活化剂溶液中的游离二氧化硅是控制其渗透性的主要因素。渗透率结果与氮吸附和压汞孔隙度测定相关联，阐明了渗透孔径对渗透率的控制作用。与现有普通硅酸盐水泥（OPC）膏体的弯曲结果对比表明，碱活化矿渣的渗透性与普通硅酸盐水泥（OPC）的渗透性相同，表明某些碱活化矿渣与普通硅酸盐水泥（OPC）一样具有抗劣化过程相关溶液侵入的能力。
Durability of alkali-activated slags has been assessed by measuring the permeability using the beam-bending technique. This nondestructive technique obtains permeability values by measuring the hydrodynamic load relaxation curve of a saturated slender beam of solid paste placed in three-point bending. The impact of activator selection on the permeability of alkali-activated slags has been assessed together with the effects of water-to-precursor ratio, revealing that free silica in the activating solution is the dominant factor controlling permeability. The permeability results have been correlated with nitrogen sorption and mercury intrusion porosimetry to elucidate the percolated pore size controlling permeability. Comparison with existing beam-bending results for ordinary portland cement (OPC) paste shows that alkali-activated slags can be synthesized with permeability having the same order of magnitude as for OPC, indicating that certain alkali-activated slags are as resistant as OPC to ingress of solutions associated with deterioration processes.