摘要
氧化石墨烯因具有较高的强度、韧性和强的表面活性等优点常被用于水泥基材料中,不仅能够提高力学性能,还可以改善耐久性。通过在混凝土中掺杂氧化石墨烯,制备了不同氧化石墨烯掺量(0,0.03%,0.06%和0.09%(质量分数))的改性混凝土,研究了氧化石墨烯掺量对改性混凝土的晶体结构、微观形貌、力学性能和抗冻性能的影响。结果表明,适量的氧化石墨烯掺杂加速了改性混凝土的水化反应,细化了孔结构,提高了密实度;随着氧化石墨烯掺杂量的增加,改性混凝土的抗压强度、抗折强度和相对弹性模量均先升高后降低,当氧化石墨烯的掺杂量为0.06%(质量分数)时,28 d的抗压强度、抗折强度和相对弹性模量均达到最大值,分别为43.05,5.58 MPa和94.19%,改性混凝土的力学性能和抗冻性能最佳。
Graphene oxide is often used in cement-based materials due to its high strength,toughness and strong surface activity,which can not only improve mechanical properties,but also improve durability.By doping graphene oxide into concrete,modified concrete with different content of graphene oxide(0,0.03 wt%,0.06 wt%and 0.09 wt%)was prepared.The effects of graphene oxide content on the crystal structure,micro morphology,mechanical properties and frost resistance of modified concrete were studied.The results show that an appropriate amount of graphene oxide doping accelerates the hydration reaction of modified concrete,refines the pore structure and improves the compactness.With the increase of graphene oxide doping,the compressive strength,flexural strength and relative elastic modulus of modified concrete first increase and then decrease.When the doping amount of graphene oxide is 0.06 wt%,the compressive strength,flexural strength and relative elastic modulus of 28 d reach the maximum,which are 43.05,5.58 MPa and 94.19%,respectively.The mechanical properties and frost resistance of modified concrete are the best.
作者
刘文娟
LIU Wenjuan(School of Building Management,Chongqing Metropolitan College of Science and Technology,Chongqing 402167,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第8期8159-8164,共6页
Journal of Functional Materials
基金
2021年重庆市教委科学技术研究计划项目(KJQN202102502)
2019年重庆市教育委员会科学技术研究项目(KJQN201902505)。
关键词
氧化石墨烯
混凝土
晶体结构
力学性能
抗冻性能
graphene oxide
concrete
crystal structure
mechanical properties
frost resistance
