考虑时间效应的钢渣填料动力特性与微观结构研究  

Study on Dynamic Characteristics and Microstructure of Steel Slag Filler Considering Time Effects

作　　者：蒋飞 王丽艳[1] 刘涛 余曜宏 王炳辉[1] 农珍珍 JIANG Fei;WANG Liyan;LIU Tao;YU Yaohong;WANG Binghui;NONG Zhenzhen(School of Archifecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003

出　　处：《防灾减灾工程学报》2024年第4期940-951,共12页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省自然基金面上项目(BK20201454);国家自然科学基金面上项目(52278355);国家自然科学基金面上项目(51978317)资助;镇江市重点研发计划社会发展面上项目(SH2021011);。

摘　　要：钢渣是冶金行业的第二大废弃物,充分利用废弃钢渣代替部分砂石料作为新型的土工填料,符合“绿色经济”与“可持续发展”战略。因钢渣材料有别于砂石料,化学成分复杂,而力学特征具有时效特性,采用共振柱试验研究考虑水化期影响的钢渣动力特性,分析动剪切模量和阻尼比等动力特性变化规律;基于Hardin-Drnevich双曲线模型描述考虑时间效应的钢渣动力特性,采用Boltzman函数描述最大动剪切模量随水化期变化的关系,给出最大阻尼比范围;并与传统砂土的动力特性对比,得出水化前钢渣动剪切模量略高于传统细砂,水化90 d后可达到标准砂的最大动剪切模量,工程中可以用钢渣作为一种填料代替砂土。最后,通过微观电子显微镜方法分析不同水化期下的钢渣微观结构,发现水化产物Aft相较于其他水化产物生成时间较晚,Aft和C-S-H所组成的胶凝结构是影响钢渣动力特性时效特征的主要因素。Steel slag is the second largest waste product in metallurgical industry.Making full use of waste steel slag to partially replace sand and gravel as a new type of geotechnical filler aligns with the strategies of"green economy"and"sustainable development".Steel slag differs from sand and gravel due to its complex chemical composition and aging mechanical properties.Resonant column tests were used to study the dynamic characteristics of steel slag considering the influence of hydration period.It analyzed the variation patterns of dynamic shear modulus and damping ratio.The dynamic characteris-tics of steel slag considering time effects were described by using the Hardin-Drnevich hyperbolic mod-el,and the Boltzman function was employed to describe the relationship between the maximum dy-namic shear modulus and the hydration period,providing the range of maximum damping ratio.Com-paring these dynamic characteristics with traditional sand,the dynamic shear modulus of steel slag be-fore hydration was slightly higher than that of traditional fine sand,and the maximum dynamic shear modulus of standard sand could be reached after 90 days of hydration.This indicates that steel slag can be used as a filler to replace sand in engineering applications.Finally,the microstructure of steel slag at different hydration periods was analyzed by scanning electron microscope,revealing that the forma-tion of hydration product Aft occurred in later stages compared to other hydration products.The gel structure composed of Aft and C-S-H was the main factor affecting the aging characteristics of steel slag dynamic properties.

关 键 词：钢渣 水化期 共振柱试验 动剪切模量 阻尼比 微观结构 

分 类 号：TU411[建筑科学—岩土工程]