This study investigated the effect of silicate modulus (M = silicon dioxide (SiO₂)/sodium oxide (Na₂O) by mass) and activator content S (mass proportion of sodium oxide and silicon dioxide to ground granulated blast-furnace slag (GGBS)) of sodium silicate (SS) solution on the compressive strength of alkali-activated GGBS (AAS) mortars. At a given solid content, the specimens activated by SS with modulus of 1.0 and 1.5 had the highest compressive strength. In the case of the same modulus of SS, the compressive strength of the AAS mortars rose linearly and then remained unchanged or declined slightly with the increase in S. The mechanism of the action of SS on AAS was studied using backscattered electron (BSE) and energy-dispersive spectroscopy (EDS). The BSE image of AAS shows that GGBS particles are tightly bonded to the surrounding hardened, jelly-like slurry, and that the structure of the GGBS particles in the AAS slurry is intact without an apparent hydrating layer around it. EDS analysis revealed that only active materials in the GGBS, mainly calcium, are dissolved to participate in reaction, and that dissolving these materials does not damage the GGBS structure. S is solidified by these active materials, which embed the GGBS particles therein to form a whole.

中文翻译：

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硅酸钠溶液化学对碱活化 GGBS 砂浆产品形成和胶凝硬化的影响

本研究调查了硅酸盐模量 (M = 二氧化硅 (SiO ₂ )/氧化钠 (Na ₂O) 和活化剂含量 S（氧化钠和二氧化硅与磨碎的高炉矿渣 (GGBS) 的质量比例）硅酸钠 (SS) 溶液对碱活化 GGBS (AAS) 砂浆的抗压强度的影响。在给定的固体含量下，由 SS 活化的试样具有最高的抗压强度，模量为 1.0 和 1.5。在SS模量相同的情况下，AAS砂浆的抗压强度随S的增加呈线性上升后保持不变或略有下降。能量色散光谱 (EDS)。AAS 的 BSE 图像显示 GGBS 颗粒与周围硬化的果冻状浆液紧密结合，并且 AAS 浆料中 GGBS 颗粒的结构完好无损，周围没有明显的水合层。EDS 分析表明，只有 GGBS 中的活性物质（主要是钙）被溶解参与反应，并且溶解这些物质不会破坏 GGBS 结构。S被这些活性物质固化，将GGBS粒子嵌入其中，形成一个整体。