为了明确微米和纳米Al2O3对水泥基材料力学性能与耐久性的改性作用,采用细度分别为1 μm和10 nm的Al2O3替代水泥,制备低水胶比水泥基材料。通过宏观和微观测试手段,分析微米和纳米Al2O3对水泥基材料力学性能与耐久性的影响规律,并探析其作用机理。试验表明:掺量为0.5%~4.0%的微米Al2O3和纳米Al2O3能增强水泥基材料的力学性能,降低其干燥收缩;0.5%~2.0%微米Al2O3和0.5%~4.0%纳米Al2O3能降低水泥基材料的渗透系数,但4.0%微米Al2O3会增大水泥基材料的渗透系数。相对而言,纳米Al2O3对水泥基材料的改性作用优于微米Al2O3。电镜扫描和文献研究结果发现,纳米Al2O3和微米Al2O3在水泥基材料水化、硬化过程中发挥尺寸效应、填充效应和表面活性效应,进而达到增强水泥基材料的力学性能和耐久性的目的。研究成果为水泥基材料的改性提供试验基础。
Abstract
By replacing cement with Al2O3 of 1 μm and 10 nm, respectively, cement-based materials with low water-binder ratio were prepared for researching the modification effect of micron-Al2O3 and nano-Al2O3 on the mechanical properties and durability of cement-based material. Macro-and-microscopic approaches were adopted to examine the change law of mechanical performance and durability and to analyze the modification mechanism. Results demonstrated that both micron-Al2O3 and nano-Al2O3 at a dosage of 0.5%-4.0% could enhance the mechanical performance while reducing the drying shrinkage of cement-based material. Micron-Al2O3 at a dosage of 0.5%-2.0% or nano-Al2O3 at a dosage of 0.5%-4.0% could reduce the permeability coefficient; however, a 4.0% micron-Al2O3 would increase the permeability coefficient. The modification effect of nano-Al2O3 is superior to that of micron-Al2O3. SEM result and previous research findings prove that in the process of cement-based material’s hydration and hardening, micron-Al2O3 and nano-Al2O3 ameliorate the mechanical performance and durability through size effect, filling effect and surface activity effect.
关键词
水泥基材料 /
微米Al2O3 /
纳米Al2O3 /
改性 /
力学性能 /
耐久性 /
作用机理
Key words
cement-based material /
micron-Al2O3 /
nano-Al2O3 /
modification /
mechanical properties /
durability /
mechanism
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 吴福飞,董双快,赵振华,等. 粉煤灰对砂浆力学性能与孔结构参数的影响[J]. 贵州师范大学学报(自然科学版) ,2018,36(3):101-107.
[2] 吴福飞,邓洪刚,等,混凝土再生胶凝材料的活性试验研究[J]. 贵州师范大学学报(自然科学版),2018,36(5):42-47.
[3] RAKI L, BEAUDOIN J, ALIZADEH R,et al.Cement and Concrete Nanoscience and Nanotechnology[J].Materials, 2010, 3: 918-942.
[4] NAZARI A, RIAHI S. Improvement Compressive Strength of Concrete in Different Curing Media by Al2O3 Nanoparticles[J]. Materials Science and Engineering: A, 2011, 528(3): 1183-1191.
[5] DE MATTEISA V, CANNAVALE A, COPPOL A,et al.Nanomaterials and Smart Nanodevices for Modular Dry Constructions: The Project “Easy House”[J]. Procedia Engineering, 2017, 80: 704-714.
[6] NAZARI A, RIAHI S. Effects of Al2O3 Nanoparticles on Properties of Self-compacting Concrete with Ground Granulated Blast Furnace Slag (GGBS) as Binder[J]. Science China: Technological Sciences, 2011, 54(9): 2327-2338.
[7] GOWDA R, NARENDRA H, RANGAPPA D, et al. Effect of Nano-alumina on Workability, Compressive Strength and Residual Strength at Elevated Temperature of Cement Mortar[J]. Materials Today: Proceedings, 2017, 4(11): 12152-12156.
[8] AREFI M R, JAVERI M R, MOLLAAHMADI E. To Study the Effect of Adding Al2O3 Nanoparticle on the Mechanical Properties and Microstructure of Cement Mortar[J]. Life Science Journal, 2011, 8(4): 613-619.
[9] NAZARI A, RIAHI S, RIAHI S,et al. Mechanical Properties of Cement Mortar with Al2O3 Nanoparticles[J]. Journal of American Science, 2010, 6(4): 94-100.
[10]CAMPILLO I,GUERRERO A,DOLADO J S,et al. Improvement of Initial Mechanical Strength by Nanoalumina in Belite Cements[J]. Mater Lett,2007(61):1889-1892.
[11]OLTULU M, SAHIN R. Single and Combined Effects of Nano-SiO2, nano-Al2O3 and nano-Fe2O3 powders on Compressive Strength and Capillary Permeability of Cement Mortar Containing Silica Fume[J]. Materials Science and Engineering: 2011, 528(22/23): 7012-7019.
[12]OLTULU M, SAHIN R. Effect of Nano-SiO2, Nano-Al2O3 and Nano-Fe2O3 Powders on Compressive Strengths and Capillary Water Absorption of Cement Mortar Containing Fly Ash: A Comparative Study[J]. Energy and Buildings, 2013, 58: 292-301.
[13]BARBHUIYA S, MUKHERJEE S, NIKRAZ H. Effects of Nano-Al2O3 on Early-age Microstructural Properties of Cement Paste[J]. Construction and Building Materials, 2014, 52: 189-193.
[14]HEIKAL M,ISMAIL M N,IBRAHIM N S. Physico-mechanical,Microstructure Characteristics and Fire Resistance of Cement Pastes Containing Al2O3 Nano-particles[J].Construction and Building Materials,2015,91:232-242.
[15]HE Xiao-dong, SHI Xian-ming. Chloride Permeability and Microstructure of Portland Cement Mortars Incorporating Nanomaterials[J]. Transportation Research Record: Journal of the Transportation Research Board, 2008:13-21. DOI: 10.3141/2070-03.
[16]MOHSENI E,MIYANDEHI B M,YANG Jian,et al. Single and Combined Effects of Nano-SiO2,Nano-Al2O3 and Nano-TiO2 on the Mechanical,Rheological and Durability Properties of Self-compacting Mortar Containing Fly Ash[J]. Construction and Building Materials,2015,84:331-340.
[17]MOHSENI E, KHOTBEHSARA M M, NASERI F, et al. Polypropylene Fiber Reinforced Cement Mortars Containing Rice Husk Ash and Nano-alumina[J]. Construction and Building Materials, 2016, 111: 429-439.
[18]ASTM C642, Standard Test Method for Density, Absorption, and Voids in Hardened Concrete[S]. Philadelphia (PA): ASTM, 2001.
基金
贵州科技厅-贵州师范大学联合基金项目(黔科合LH字7351);贵州省教育厅青年科技人才成长项目(黔教合KY字125);贵州师范大学 2016 年博士科研启动项目(0517073);贵州省科学技术基金项目(黔科合LH字7046号, 黔科合J字LKS41号)
PDF(4303 KB)
