摘要
为解决镍渣砂与水泥浆体界面结合力弱以及提高其在高强度水泥胶砂中的应用性,采用双丙酮丙烯酰胺(DAAM)、己二酸二酰肼(ADH)对镍渣砂进行表面改性,通过正交试验法研究不同镍渣掺量及表面改性剂掺量对水泥胶砂流动度、黏聚性及抗压强度的影响,并结合微观扫描电镜(SEM)分析其界面结构演变。研究结果表明:1)DAAM掺量对提升28 d抗压强度效果最为显著,但过量掺入(>0.6%)会导致强度劣化;2)ADH对改善黏聚性与后期强度有一定作用,但影响弱于DAAM;3)微观分析显示,改性后镍渣与水泥浆体界面过渡区更为密实,结合紧密,有效改善了原有薄弱结构。本研究证实,当改性镍渣掺量不超过30%,并采用0.4%DAAM与0.6%ADH复合掺加时,可显著提升水泥胶砂的综合性能,为其高附加值资源化利用提供技术支撑。
To address the weak interfacial bonding between nickel slag and cement paste and enhance its applicability in high-strength cement mortar,surface modification of nickel slag sand was carried out using diacetone acrylamide(DAAM)and adipic acid dihydrazide(ADH).The influence of different nickel slag contents and surface modifier dosages on the fluidity,cohesion,and compressive strength of cement mortar was investigated through orthogonal testing,and scanning electron microscopy(SEM)was used to analyze the evolution of the interfacial structure.The results indicate that:1)The DAAM dosage significantly enhances the 28-day compressive strength,but excessive addition(>0.6%)leads to strength degradation;2)ADH contributes moderately to improving cohesion and long-term strength,though its overall effect is weaker than that of DAAM;3)Microscopic analysis reveals that the modified interface between nickel slag and cement paste exhibits a denser interfacial transition zone(ITZ)with tighter bonding,which effectively reinforces the originally weak structure.This study confirms that the addition of less than 30%modified nickel slag along with the combined addition of 0.4%DAAM and 0.6%ADH significantly improves the overall performance of cement mortar,providing technical support for the high value resource utilization of nickel slag.
作者
倪骏鹏
NI Junpeng(Fujian Academy of Building Research Co.,Ltd.,Fuzhou 350025;Fujian Provincial Key Laboratory of Green Building Technology,Fuzhou 350025)
出处
《公路交通技术》
2026年第1期69-77,共9页
Technology of Highway and Transport
基金
福建省科技厅引导性项目(2022Y0045)
福建省科技计划区域发展项目(2024Y3005)
福建省科技计划区域发展项目(2025Y3006)
福建省环保科技计划项目(2025R018)。
关键词
改性
镍渣
水泥胶砂
性能
nickel slag modification
nickel slag
cement mortar
performance
