摘要
氧化石墨烯凭借较高的比表面积和独特的片层状结构,具有优异的理化性能。为获得高性能的水泥基注浆材料,通过引入不同掺杂量(0.00,0.02%,0.04%和0.06%(质量分数))的氧化石墨烯,制备了改性水泥基注浆材料。采用XRD、SEM、FT-IR和力学性能测试等分析了氧化石墨烯的掺杂量对改性水泥基注浆材料晶体结构、力学性能和自收缩性能的影响。结果表明:氧化石墨烯的掺杂加速了水化反应的进行,提高了Ca(OH)_(2)的生成速率,同时减小了裂纹数量,增加了结构致密性;当氧化石墨烯的掺杂量为0.04%(质量分数)时,28 d的抗压强度、抗折强度和劈裂抗拉强度均达到了最大值,分别为59.80,14.70和1.89 MPa;所有注浆材料在水化前期收缩较快,20 h后收缩量进入了“平台期”,随着氧化石墨烯掺杂量的增加,改性注浆材料的自收缩性能抑制效果先增大后减小,当氧化石墨烯的掺杂量为0.04%(质量分数)时,改性注浆材料的自收缩量最小。
Graphene oxide has excellent physical and chemical properties due to its large specific surface area and lamellar structure.In order to obtain high-performance cement-based grouting materials,modified cement-based grouting materials were prepared by introducing graphene oxide with different doping amounts(0.00,0.02 wt%,0.04 wt%and 0.06 wt%).XRD,SEM,FT-IR and mechanical property tests were used to analyze the influence of doping amount of graphene oxide on the crystal structure,mechanical properties and self shrinkage properties of modified cement-based grouting materials.The results showed that the doping of graphene oxide accelerated the hydration reaction,increased the formation rate of Ca(OH)_(2),reduced the number of cracks and increased the structural compactness.When the doping amount of graphene oxide was 0.04 wt%,the compressive strength,flexural strength and splitting tensile strength at 28 d reached the maximum,which were 59.80,14.70 and 1.89 MPa respectively.All grouting materials shrank rapidly in the early stage of hydration,and the shrinkage amount entered the"platform period"after 20 h.With the increase of the doping amount of graphene oxide,the self shrinkage inhibition effect of the modified grouting materials first increased and then decreased,and when the doping amount of graphene oxide was 0.04 wt%,the self shrinkage of the modified grouting material was the smallest.
作者
程思嫄
陈代果
古巍
CHENG Siyuan;CHEN Daiguo;GU Wei(Sichuan University Jinjiang College,Meishan 620860,China;College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,China;CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science andTechnology of China,Hefei 230026,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第2期2153-2158,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(12002293)。
关键词
氧化石墨烯
注浆材料
力学性能
形貌结构
自收缩性能
graphene oxide
grouting materials
mechanical properties
morphology and structure
self shrinkage properties
