TiO_2纳米颗粒对水泥-粉煤灰体系水化硬化及氯离子侵蚀的影响
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摘要
利用微量热分析、X射线衍射(XRD)、差热分析(DSC)、扫描电子显微镜(SEM)、压汞测孔仪(MIP)等手段研究了TiO_2纳米颗粒对水泥粉煤灰体系水化硬化以及抗氯离子侵蚀的影响。研究发现:TiO_2纳米颗粒的异相晶核效应和微集料填充效应协同作用,促进了水泥熟料的水化,加快了粉煤灰的二次水化进程并降低了硬化水泥石的孔体积,使水泥粉煤灰材料的微观结构更加均匀密实,提高了水泥粉煤灰材料的力学性能和抗氯离子侵蚀性能。
Micro-thermal analysis,X-ray diffraction(XRD),differential scanning calorimetry(DSC),scanning electron microscopy(SEM),and mercury intrusion porosimetry(MIP) were employed in the present work to study the hydration-hardening performance and the chloride erosion resistance of cement-fly ash system containing TiO_2 nanoparticles. Results showed that the synergic action of heterogeneous nucleation effect and micro-aggregate filling effect of TiO_2 particles promotes the hydration of cement,accelerates the secondary hydration of fly ash and causes pore volume decrease of the matrix. In consequence,the hardened pastes become more homogeneous and compact,resulting in an improvement in mechanical properties and chloride erosion resistance.
Micro-thermal analysis,X-ray diffraction(XRD),differential scanning calorimetry(DSC),scanning electron microscopy(SEM),and mercury intrusion porosimetry(MIP) were employed in the present work to study the hydration-hardening performance and the chloride erosion resistance of cement-fly ash system containing TiO_2 nanoparticles. Results showed that the synergic action of heterogeneous nucleation effect and micro-aggregate filling effect of TiO_2 particles promotes the hydration of cement,accelerates the secondary hydration of fly ash and causes pore volume decrease of the matrix. In consequence,the hardened pastes become more homogeneous and compact,resulting in an improvement in mechanical properties and chloride erosion resistance.
引文
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2 Wang A Q,Zhang C Z,Sun W.Cement and Concrete Research,2004,34,2057.
3 Wang A Q,Zhang C Z,Sun W.Cement and Concrete Research,2004,34,2061.
4 Li Y,Jia L,Ma Q B.Concrete,2014(10),93(in Chinese).李源,贾磊,马清波.混凝土,2014(10),93.
5 Yu Z Q,Ye G.Construction and Building Materials,2013,45,30.
6 Hou P K,Kawashima S,Wang K J,et al.Cement and Concrete Composites,2013,35(1),12.
7 Wang S Z,Llamazos E,Baxter L,et al.Fuel,2008,87(3),359.
8 Sakai E,Miyahara S,Ohsawa S,et al.Cement and Concrete Research,2005,35(6),1135.
9 Lam L,Wang Y L,Poon C S.Cement and Concrete Research,2000,30(5),747.
10 Chen J,Kou S C,Poon C S.Cement and Concrete Research,2012,(34),642.
11 Hou P K.Effects of nano SiO2on the hydration and hardening properties of fly ash cementitious materials.Ph.D.Thesis,Chongqing University,2012(in Chinese).侯鹏坤.纳米SiO2对水泥粉煤灰体系水化硬化作用研究.博士学位论文,重庆大学,2012.
12 Rahhal V,Talero R.Journal of Thermal Analysis and Calorimetry,2004,78(1),191.
13 Nocu-Wczelik W.Journal of Thermal Analysis and Calorimetry,2001,65(2),613.
14 Lee B Y,Kurtis K E.Journal of the American Ceramic Society,2010,93(10),3399.
15 Nazari A,Riahi S.Materials Science and Engineering:A,2010,528(2),756.