石墨烯增韧粉煤灰混凝土的制备及耐久性能研究  

Preparation and durability of graphene toughened fly ash concrete

作　　者：陈辉[1] 陈芳芳[2] CHEN Hui;CHEN Fangfang(College of Urban Construction,Jingxi University of Technology,Nanchang 330098,China;Modern Education Technology Center,Jingxi University of Technology,Nanchang 330098,China)

机构地区：[1]江西科技学院城市建设学院,南昌330098 [2]江西科技学院现代教育技术中心,南昌330098

出　　处：《功能材料》2023年第5期5198-5203,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(82001160);江西省科技厅科技合作领域一般项目(20192BBHL80006);江西省教育厅科学技术一般项目(GJJ202006)。

摘　　要：为改善粉煤灰混凝土水化活性偏低和强度不足等问题,通过在粉煤灰混凝土中添加石墨烯,制备了具有优异力学性能和耐久性能的石墨烯增韧粉煤灰混凝土。分析了石墨烯掺杂量对粉煤灰混凝土力学性能、水化反应和耐磨性能的影响。结果表明,石墨烯的添加加速了水化反应的进行,缩短了水化诱导期的时间,增大了诱导期水化热释放速率,使得水化放热速率达到峰值的时间减小,混凝土中水化产物的量增多,混凝土的结构致密性提高。随着石墨烯掺杂量的增加,混凝土的抗压强度、抗折强度和挠度值先增大后降低,0.05%(质量分数)石墨烯掺杂量的混凝土的抗压强度和抗折强度均达到最大值,分别为44.32和5.96 MPa,较纯混凝土分别提高了12.89%和10.78%;0.05%(质量分数)石墨烯掺杂量的混凝土的挠度值最大为7.1 mm,抗变形能力提高;随着石墨烯掺杂量的增加,混凝土的单位面积磨损量先减小后轻微增大,0.05%(质量分数)石墨烯掺杂量的混凝土的磨损量最小为1.13 kg/m^(2),耐磨性能最优。In order to improve the low hydration activity and insufficient strength of fly ash concrete,graphene toughened fly ash concrete with excellent mechanical properties and durability was prepared by adding graphene to fly ash concrete.The influence of graphene content on mechanical properties,hydration reaction and wear resistance of fly ash concrete was analyzed.The results showed that the addition of graphene accelerated the hydration reaction,shortens the time of hydration induction period,increased the rate of hydration heat release during the induction period,reduced the time when the rate of hydration heat release reached the peak,increased the amount of hydration products in concrete,and improved the structural compactness of concrete.With the increase of graphene doping,the compressive strength,flexural strength and deflection of concrete increasd first and then decreased.The compressive strength and flexural strength of the concrete with 0.05 wt%of graphene content reached the maximum,which were 44.32 and 5.96 MPa,respectively,which were 12.89%and 10.78%higher than that of pure concrete.The maximum deflection value of 0.05 wt%graphene doped concrete was 7.1 mm,and the deformation resistance was improved.With the increase of graphene doping,the wear amount per unit area of concrete decreased first and then increased slightly,the concrete with 0.05wt%of graphene content had the minimum abrasion loss of 1.13 kg/m 2,and the abrasion resistance was the best.

关 键 词：石墨烯 粉煤灰混凝土 水化速率 力学性能 耐磨性 

分 类 号：TU528.04[建筑科学—建筑技术科学]