摘要
为探明混掺氧化石墨烯(MGO)和改性硅粉(MSF)对水泥基材料阻尼特性的作用机理,利用正交试验极差分析判断抗压强度的影响顺序,采用强度试验和动态热机械分析仪分别测试抗压强度和损耗因子,采用压汞仪和环境扫描电镜分别测试孔结构和微观形貌。结果表明:混掺MGO-MSF(B4)的抗压强度比单掺聚合物的水泥浆体(J1)的提高了25%~30%,而B4的损耗因子比J1的只降低了15%~20%。保持MGO∶MSF比例为1∶99时,随着掺合物总量(3%,5%,7%)增加,损耗因子呈现先上升后下降的趋势。混掺MGO-MSF促进了水化反应,使得B4形成更多的C-S-H凝胶和凝胶孔,有利于提高强度,表现为抗压强度B4>J1;同时,J1中存在大量小毛细孔,增强了减振耗能作用,有利于提高损耗因子,表现为损耗因子J1>B4。
The damping property and micro-mechanism of cementitious materials with mutilayer graphene oxide and modified silica fume(MGO-MSF)were studied.The order of influencing factors on compressive strength was determined by means of an orthogonal design and a range analysis.The compressive strength,loss factor,and pore structure,micro-morphology of hardened cement paste were characterized by the dynamic thermomechanical analysis and the mercury intrusion porosimetry and environmental scanning electron microscopetest,respectively.The results show that the compressive strength by the addition of MGO-MSF(B4)is greater by 25%-30%than that by the addition of polymer emulsion(J1),while the loss factor of B4 is only inferior by 15%-20%to that of the J1.Keeping the mass ratio of MGO to MSF at 1∶99,the loss factor increases firstly and then decreases as the number of the otal amount of admixtures(3%,5%,7%)increases.The compressive strength of B4 is higher than that of J1 owing to the fact that MGO-MSF promotes the hydration reaction which makes B4 produce a large amount of C-S-H gel and C-S-H gel pores.Meanwhile,a mass of small capillary pores of J1 improve the effect of energy dissipation and enhance the loss factor,which results in that the loss factor of J1 is higher than that of B4.
作者
王信刚
黄昱清
张晨阳
WANG Xingang;HUANG Yuqing;ZHANG Chenyang(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第2期193-198,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51972158,52062032,51562024)
江西省杰出青年人才资助计划(20162BCB23014)
南昌大学研究生创新专项(CX2018059)。
