摘要
以河钢集团邯钢公司的LF精炼渣为研究对象,研究精炼渣的基本物理化学性质,运用X射线衍射(XRD)、微量热法、热重-差示扫描量热法(TG-DSC)、场发射扫描电镜(FE-SEM)和能量色散谱(EDX)等手段分析精炼渣的水化过程。研究结果表明:在水胶比为0.32的条件下,精炼渣水化活性较好,极早期水化速率和160 h水化累计放热量均比转炉钢渣的高。精炼渣的比表面积对其水化速率、水化放热量和早期净浆强度具有显著影响,但对中后期净浆强度和水化产物类型影响不明显。这种精炼渣的主要水化产物是C_(4)AH_(13)、C_(3)AH_(6)、C-A-S-H凝胶和AH3凝胶,C_(4)AH_(13)、C_(3)AH_(6)与非晶态凝胶产物的复合结构是水化28 d前净浆强度的主要来源。
Taking the refining slag of Ladle furnace(LF)from Handan Iron&Steel Group as research target,the basic physical and chemical properties of refining slag were studied.The hydration process of refining slag was analyzed by X-ray diffraction(XRD),microcalorimetry,thermogravimetric−differential scanning calorimetry analysis(TG−DSC),field emission scanning electron microscopy(FE−SEM)and energy dispersive X-ray spectroscopy(EDX).The results show that at the water-binder ratio of 0.32,the hydration activity of refining slag is better,and the hydration rate at the very early stage and the accumulated heat within the first 160 h are higher than that of converter steel slag.The specific surface area of refining slag has a significant effect on its hydration rate,heat release of hydration and early paste strength,but has no significant effect on the middle paste strength,later paste strength and the type of hydration products.The main hydration products of this kind of refining slag are C_(4)AH_(13),C_(3)AH_(6),C−A−S−H gel and AH3 gel.The composite structure of C_(4)AH_(13),C_(3)AH_(6)and amorphous gel product is the main source of the paste strength in the 28 d hydration.
作者
李颖
汪坤
梁文特
张思奇
卢翔宇
许成文
倪文
LI Ying;WANG Kun;LIANG Wente;ZHANG Siqi;LU Xiangyu;XU Chengwen;NI Wen(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Handan Iron&Steel Group Co.Ltd.,HBIS Group Co.Ltd.,Handan 056015,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第2期339-349,共11页
Journal of Central South University:Science and Technology
基金
国家重点研发计划重点专项项目(2019YFC1900603)。
