基于水化特性的钢渣膨胀抑制机理研究  

Study on the Mechanism of Steel Slag Expansion Inhibition Based on Hydration Characteristics

作　　者：袁正国 陶智忠 YUAN Zhengguo;TAO Zhizhong(Ningxia Transportation Investment Group Co.,Ltd.,Yinchuan 750000,China;Ningxia Communications Construction Co.,Ltd.,Yinchuan 750004,China;Ningxia Construction Transportation Technology Research Institute Co.,Ltd.,Yinchuan 750004,China)

机构地区：[1]宁夏交通投资集团有限公司,宁夏银川750000 [2]宁夏交通建设股份有限公司,宁夏银川750004 [3]宁夏交建交通科技研究院有限公司,宁夏银川750004

出　　处：《金属矿山》2025年第2期263-269,共7页Metal Mine

基　　金：宁夏回族自治区重点研发计划(引才专项)项目(编号:2022BSB03078);宁夏回族自治区重点研发计划项目(编号:2022BFE02006);宁夏回族自治区交通运输厅科技项目(编号:202300196)。

摘　　要：为了预测钢渣水化膨胀规律并提出水化膨胀抑制措施,根据钢渣水化反应建立膨胀模型,同时分析不同掺量、不同细度的粉煤灰对钢渣的抑制作用,基于X射线衍射(XRD)、扫描电子显微镜(SEM)技术探究了其抑制机理。结果表明:钢渣水化膨胀与f-CaO和f-MgO的含量、颗粒大小、混合料级配及相对密度均有直接关系,理论模型结果与实测值吻合程度较好。钢渣浸水膨胀增长速率随着浸水龄期的延长呈现先快后缓的趋势,粉煤灰的掺量增大抑制钢渣膨胀的效果增强,且一级灰抑制钢渣膨胀的效果优于原灰;钢渣表面空隙多,水化通道丰富,粉煤灰越细,形态效应越强,对钢渣抑制效果越好,钢渣粉煤灰体系中的水化产物主要是锚片状、纤维状的水化硅酸钙凝胶(C-S-H)、水化硅酸镁凝胶(M-S-H)和针棒状钙矾石(AFt),可有效填充钢渣水化通道,抑制钢渣膨胀。In order to predict the hydration expansion law of steel slag and put forward the inhibition measures of hydration expansion,the expansion model was established according to the hydration reaction of steel slag.At the same time,the inhibition effect of fly ash on steel slag under different dosage and fineness was analyzed.The inhibition mechanism was explored based on X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results show that the hydration expansion of steel slag is directly related to the content of f-CaO and f-MgO,particle size,mixture gradation and relative density.The theoretical model results are in good agreement with the measured values.The growth rate of steel slag soaking and expansion increases first and then slows down with the extension of soaking age.The effect of inhibiting the expansion of steel slag is enhanced with the increase of fly ash content,and the effect of inhibiting the expansion of steel slag by primary ash is better than that of raw ash.There are many pores on the surface of steel slag,and the hydration channels are abundant.The smaller the fineness of fly ash is,the stronger the morphological effect is,and the better the inhibition effect on steel slag is.The hydration products in the steel slag fly ash system are mainly anchor flake and fibrous hydrated calcium silicate gel(C-S-H),hydrated magnesium silicate gel(M-S-H)and needle rod ettringite(AFt),which can effectively fill the steel slag hydration channel and inhibit the expansion of steel slag.

关 键 词：钢渣 粉煤灰 膨胀 抑制 水化反应 机理 

分 类 号：U414[交通运输工程—道路与铁道工程]