氧化石墨烯对水泥水化产物及聚集状态的调控作用
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摘要
通过对石墨的氧化及超声波分散制备了氧化石墨烯(GO)纳米片层,采用FTIR、XPS、SEM、AFM对其结构进行了表征。测试结果表明:GO纳米片层尺寸为100~800 nm,GO上羟基和羧基的质量分数分别为22.1%和29.4%。将GO掺入水泥基复合材料,在GO的加入质量为水泥质量的0.03%时,水泥基体主要由多面体状晶体通过交织、嵌入等方式聚集而成,形成了具有花型形貌的微观结构,与空白样比较,其28 d时平均抗折强度和抗压强度分别增加了93.9%和80.0%。
Graphene oxide( GO) nanosheets were prepared by oxidizing and ultrasonic treatment to graphite. The resulting GO nanosheets were characterized by FTIR,XPS,SEM and AFM. The results indicated that the content of hydroxyl and carboxyl on the surface of GO are 22. 1% and 29. 4%,respectively. And nanosheet sizes of 100 ~ 800 nm are obtained. Subsequently,these GO nanosheets were added into cement composites. When the additive amount of GO was 0. 03%( based on cement weight),the SEM results indicated that the whole cement matrix consisted polyhedron-like crystals by interwovening and embedding ways and had ordered dense microstructures with flower-like patterns.The average flexural strength and compressive strength of the hardened cement paste after 28 d increased by 93. 9% and 80. 0% compared with that of the sample without GO,respectively.
Graphene oxide( GO) nanosheets were prepared by oxidizing and ultrasonic treatment to graphite. The resulting GO nanosheets were characterized by FTIR,XPS,SEM and AFM. The results indicated that the content of hydroxyl and carboxyl on the surface of GO are 22. 1% and 29. 4%,respectively. And nanosheet sizes of 100 ~ 800 nm are obtained. Subsequently,these GO nanosheets were added into cement composites. When the additive amount of GO was 0. 03%( based on cement weight),the SEM results indicated that the whole cement matrix consisted polyhedron-like crystals by interwovening and embedding ways and had ordered dense microstructures with flower-like patterns.The average flexural strength and compressive strength of the hardened cement paste after 28 d increased by 93. 9% and 80. 0% compared with that of the sample without GO,respectively.
引文
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[2]Li Qingfu(李清富),Deng Lianqun(邓连群),Jin Jiugui(靳九桂).Experimental strudy on fracture properties and durability of high performance concrete[M].Beijing(北京):China communication press Co.,Ltd(人民交通出版社股份有限公司),2015:1-8.
[3]Wang Dehui(王德辉),Shi Caijun(史才军),Wu Lingmei(吴林妹).Research and applications of ultra-high performance concrete(UHPC)in China[J].Bulletin of the Chinese Ceramic and Society(硅酸盐通报),2016,35(1):142-151.
[4]Wang Hui(王辉),Liu Aihong(刘爱红),Li Hang(李航).Effect of graphenenanoplatelets on mechanicalproperties of cementcomposites[J].China Concrete and Cement products(混凝土与水泥制品),2015,(12):25-27.
[5]Li Qinghua(李庆华),Zhou Baomin(周宝民),Huang Botao(黄博滔).The size effect of compressive properties of ultra high toughness cementitious composites(UHTCC)[J].Journal of Hydraulic Engineering(水利学报),2015,46(2):174-182.
[6]Alkaysi M,El-Tawil S.Effects of variations in the mix constituents of ultra high performance concrete(UHPC)on cost and performance[J].Matterials and structures,2016,49(10):4185-4200.
[7]Zhang J,Wang Q,Wang ZB.Optimizing design of high strength cement matrix with supplementary cementitious materials[J].Construction and Building Materials,2016,120,123-126.
[8]Aqel M,Panesar DK.Hydration kinetics and compressive strength of steam-cured cement pastes and mortars containing limestone filler[J].Construction and Building Materials,2016,113:359-368.
[9]Tennich M,Kallel A,Ben Ouezdou M.Incorporation of fillers from marble and tile wastes in the composition of self-compacting concretes[J].Construction and Building Materials,2015,91:65-70.
[10]Zhang Wei(张伟),Zong Lan(宗兰),Zhang Shiping(张士萍).Effects of hybrid fibers on the resistance to cracking of the highperformance concrete at early age[J].Concrete(混凝土),2016,(8):16-19.
[11]Ahn TH,Kim HG,Ryou JS.New surface-treatment technique of concrete structures using crack repair stick with healing ingredients[J].Materials,2016,9(8):654-673.
[12]Liu Qiong(刘琼),Xu Qingfeng(许清风),Li Xiangmin(李向民).Research progress of graphene and carbon nano tube cement composites[J].China Concrete and Cement products(混凝土与水泥制品),2016,(3):25-31.
[13]Gao Dangguo(高党国),Ma Yujuan(马宇娟).Preparation and properties of copolymer of graphene oxide and monomers of polycarboxylate superplasticizer[J].Fine Chemicals(精细化工),2015,32(1):103-107.
[14]Lv Shenghua(吕生华),Li Ying(李莹),Zhao Haoran(赵浩然).Dispersity of graphene oxide in cement matrix and impact on its structure and properties[J].Fine Chemicals(精细化工),2016,33(5):589-595.
[15]Lv SH,Ma YJ,Qiu CC,et al.Effect of graphene oxide nanosheets of microstructure and mechanical properties of cement composites[J].Construction and Building Materials,2013,49:121-127.
[16]Lv SH,Deng LJ,Yang WQ,et al.Fabrication of polycarboxylate/graphene oxide nanosheet composites using copolymerization,for reinforcing and toughening cement composites[J],Cement and Concrete Composites,2016,66:1-9.
[17]Zhao Haifeng(赵海锋),Deng Lijuan(邓丽娟).Mechanism of reinforcing and toughening cement-based composites by graphene oxide[J].Journal of Shaanxi University of Science and Technology(陕西科技大学学报),2016,34(3):60-64.
[18]National Bureau of Standards(国家标准局).Method of cementDeterimination of strength(水泥胶砂强度检验方法):GB/T17671-1999[S].Beijing(北京):Standards Press of China(中国标准出版社),1999:1-3.