氧化石墨烯对水泥基自流平砂浆性能的影响
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摘要
通过氧化和超声波分散制备了浓度为7. 4 g/L的氧化石墨烯(GO)分散液,研究了不同GO掺量条件下硅酸盐体系自流平砂浆及其硬化体的流动度、凝结时间、力学性能和耐久性能,并借助XRD、SEM和MIP等手段分析其改性机理。实验得出GO的最佳掺量是0. 04%(质量分数)。在该掺量下,相比未掺GO的空白样,水泥基自流平砂浆的流动度与凝结时间稍有降低,28 d抗折、抗压强度和耐磨性能分别提高38. 9%、27. 7%和48. 8%。28 d试样的氯离子渗透性能较空白样降低了98. 5%。微观测试结果表明,氧化石墨烯能够促进硅酸盐水泥的水化进程,调控水泥水化产物的微观结构,从而提高水泥基自流平材料的力学性能和耐久性能等。
In this paper,a graphene oxide( GO) dispersion at a concentration of 7. 4 g/L was prepared by oxidation and ultrasonic dispersion,and was then added into the cement-based self-leveling mortar to determine the effects of GO dose on fluidity,setting time,mechanical properties and the durability of the fresh and hardened mortar. Moreover,the modification mechanism was analyzed by means of XRD,SEM and MIP. We found that the best dosage of GO is 0. 04 wt%,under which,compared to the control sample,the self-leveling mortar achieves increments in flexural strength,compressive strength,wear-resistance of 38. 9%,27. 7% and 48. 8%,respectively,the chloride ion permeability of the sample was 98. 5% lower than that of the blank sample,although there can be observed slight decreases in fluidity and setting time. Microscopic test results indicated that the GO can promote the hydration process of Portland cement and regulate the microstructure of the hydration products,and in consequence,contribute to mechanical properties and durability improvements of the hardened cement-based self-leveling mortar.
In this paper,a graphene oxide( GO) dispersion at a concentration of 7. 4 g/L was prepared by oxidation and ultrasonic dispersion,and was then added into the cement-based self-leveling mortar to determine the effects of GO dose on fluidity,setting time,mechanical properties and the durability of the fresh and hardened mortar. Moreover,the modification mechanism was analyzed by means of XRD,SEM and MIP. We found that the best dosage of GO is 0. 04 wt%,under which,compared to the control sample,the self-leveling mortar achieves increments in flexural strength,compressive strength,wear-resistance of 38. 9%,27. 7% and 48. 8%,respectively,the chloride ion permeability of the sample was 98. 5% lower than that of the blank sample,although there can be observed slight decreases in fluidity and setting time. Microscopic test results indicated that the GO can promote the hydration process of Portland cement and regulate the microstructure of the hydration products,and in consequence,contribute to mechanical properties and durability improvements of the hardened cement-based self-leveling mortar.
引文
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2 Flett M S C. Journal of Shijiazhuang Institute of Railway Engineering,1948,179(1),1441.
4 Tiberti G,Minelli F,Plizzari G A,et al. Cement&Concrete Composites,2014,45(1),176.
5 Tao W H,Liu C,Fu X H,et al. Applied Mechanics&Materials,2015,740,19.
6 Bangi M R,Horiguchi T. Cement&Concrete Research,2011,41(11),1150.
7 Sebaibi N,Benzerzour M,Abriak N E,et al. Construction&Building Materials,2012,29(4),332.
8 Garas V Y,Kahn L F,Kurtis K E. Cement&Concrete Composites,2009,31(3),147.
9 Chakraborty S,Kundu S P,Roy A,et al. Industrial&Engineering Chemistry Research,2013,52(3),1252.
10 Freidin C. Cement&Concrete Research,2003,33(9),1417.
11 Deschner F,Winnefeld F,Lothenbach B,et al. Cement&Concrete Research,2012,42(10),1389.
12 Jiang L L,Lu X. Journal of Functional Materials,2012(23),3185(in Chinese).姜丽丽,鲁雄.功能材料,2012(23),3185.
13 Pacheco-Torgal F,Jalali S. Construction&Building Materials,2011,25(2),582.
14 Gong K,Pan Z,Korayem A H,et al. Journal of Materials in Civil Engineering,2015,27(2),A4014010.
15 Thostenson E T,Ren Z,Chou T W. Composites Science&Technology,2001,61(13),1899.
16 Cheng Y,Sun J Y,Zheng M. Bulletin of the Chinese Ceramic Society,2017(5),1700(in Chinese).程阳,孙家瑛,郑明.硅酸盐通报,2017(5),1700.
17 Zheng Y L,Zheng J Q,Zhang M. Journal of Tongji University(Natural Science),2010,38(3),410(in Chinese).郑永来,郑洁琼,张梅.同济大学学报(自然科学版),2010,38(3),410.
18 Wang Q,Wang J,Lu C X,et al. New Carbon Materials,2015,30(4),349.
19 Ghafari E,Costa H,Julio E. Construction&Building Materials,2015,101,201.
20 Li H,Xiao H G,Ou J P. Cement&Concrete Research,2004,34(3),435.
21 Li H,Xiao H G,Yuan J,et al. Composites Part B,2004,35(2),185.
22 Lyu Shenghua,Sun Ting,Liu Jingjing,et al. Acta Materiae Compositae Sinica,2014,31(3),644(in Chinese).吕生华,孙婷,刘晶晶,等.复合材料学报,2014,31(3),644.
23 Chen Yimin,Xu Zhongzi. The scientific basis for preparation and application of high performance cement,Chemical Industry Press,2008.
24 Lv S,Liu J,Sun T,et al. Construction&Building Materials,2014,64(64),231.
25 Lv S,Ma Y,Qiu C,et al. Construction&Building Materials,2013,49(12),121.
26 Lv S H,Deng L J,Yang W Q,et al. Cement&Concrete Composites,2016,66,1.
27 Cui H,Yan X,Tang L,et al. Cement&Concrete Composites,2017,77,81.
28 Yang R,Liu B,Wu Z. Cement and Concrete Research,1990,20,385.