This study enhanced the hydration of steel slag (SS) by the synergistic chemical activation of triisopropanolamine (TIPA) and sulfite/sulfate. Adding 0.2% TIPA into a cementitious material consisting of 62.5% SS and 37.5% desulfurization ash (DA) increased the 3-days and 120-days compressive strength by 9.59 times and 1.78 times, respectively. This enhancement was due to the accelerated dissolution of CS and CF facilitated by DA and TIPA. The complexation between TIPA and Fe accelerated the consumption of Ca and SO, thereby promoted the generation of Fe-containing hydrates such as C(F, A)SH and FeSO·7HO, significantly refining the pore structure. The TIPA-Fe complex also contributed to C-(F)-S-H gels formation, shifting hydration exothermal peak from 4.8 h to 1.1 h, with the peak value rising from 0.90 J/(g·h) to 57.07 J/(g·h). The Fe evolution even induced a colour change in the matrix. These insights contribute valuable perspectives for utilizing Fe-rich solid-wastes in cementitious materials.

中文翻译：

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增强钢渣基复合胶凝材料的水化：三异丙醇胺（TIPA）和亚硫酸盐/硫酸盐的协同作用


这项研究通过三异丙醇胺（TIPA）和亚硫酸盐/硫酸盐的协同化学活化增强了钢渣（SS）的水化。在由62.5%SS和37.5%脱硫灰（DA）组成的胶凝材料中添加0.2%TIPA，其3天和120天抗压强度分别提高了9.59倍和1.78倍。这种增强是由于 DA 和 TIPA 促进了 CS 和 CF 的加速溶解。 TIPA与Fe的络合加速了Ca和SO的消耗，从而促进了C(F,A)SH和FeSO·7HO等含Fe水合物的生成，显着细化了孔隙结构。 TIPA-Fe配合物还有助于C-(F)-SH凝胶的形成，将水合放热峰从4.8 h移至1.1 h，峰值从0.90 J/(g·h)升至57.07 J/(g·h)。 H）。 Fe 的演化甚至引起基质的颜色变化。这些见解为在水泥材料中利用富铁固体废物提供了宝贵的前景。