α和γ型纳米Al_2O_3对水泥基材料性能的影响
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摘要
为了探究α型和γ型纳米Al_2O_3对水泥基材料的改性作用,采用细度为30 nm的α型和γ型纳米Al_2O_3、尧柏水泥、标准砂和聚羧酸减水剂制备水泥基材料,探析α型和γ型纳米Al_2O_3对水泥基材料的凝结时间、力学性能和收缩性能的影响,并分析其作用机理。结果表明:α型和γ型纳米Al_2O_3均会降低水泥基材料的凝结时间,提高水泥基材料的抗折强度和抗压强度,降低水泥基材料的干燥收缩,但γ型纳米Al_2O_3对水泥基材料的改性作用低于α型纳米Al_2O_3。综合本文和文献分析发现,纳米Al_2O_3在水泥基材料中发挥着尺寸效应、填充效应和表面效应,从而达到改性水泥基材料的力学性能和耐久性。
In order to understand the modification effects of α and γ type nano-Al_2O_3 on the cement base material,the 30 nm α and γ type nano-Al_2O_3,Yaobai cement,standard sand and carboxylic acid water reducing agent were used to make cement base materials,the setting time,mechanical properties and shrinkage performance and their mechanism were analyzed. The results showed that: The setting time of cement base material can be reduced,the flexural strength and compressive strength of cement base material can be improved,and the drying shrinkage of cement-based materials can be reduced when nanoAl_2O_3 of α and γ type replace cement. But the modification effect of α type nano-Al_2O_3 on cement base material is lower than the γ type. Based on the analysis of this article and literature review,we found that nano-Al_2O_3 of α and γ type in cement base material plays the roles of size effect,filling effect and surface effect,which will achieve the ideas that modified mechanical properties and durability of cement base material.
In order to understand the modification effects of α and γ type nano-Al_2O_3 on the cement base material,the 30 nm α and γ type nano-Al_2O_3,Yaobai cement,standard sand and carboxylic acid water reducing agent were used to make cement base materials,the setting time,mechanical properties and shrinkage performance and their mechanism were analyzed. The results showed that: The setting time of cement base material can be reduced,the flexural strength and compressive strength of cement base material can be improved,and the drying shrinkage of cement-based materials can be reduced when nanoAl_2O_3 of α and γ type replace cement. But the modification effect of α type nano-Al_2O_3 on cement base material is lower than the γ type. Based on the analysis of this article and literature review,we found that nano-Al_2O_3 of α and γ type in cement base material plays the roles of size effect,filling effect and surface effect,which will achieve the ideas that modified mechanical properties and durability of cement base material.
引文
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[16]NAZARI A,RIAHI S.Abrasion resistance of concrete containing Si O2and Al2O3nanoparticles in different curing media[J].Energy and Buildings,2011,43(10):2939-2946.
[17]HE Xiaodong,SHI Xianming.Chloride permeability and microstructure of Portland cement mortars incorporating nanomaterials[J].Transportation Research Record:Journal of the Transportation Research Board,2008(2070):13-21.
[2]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.
[3]吴福飞,邓洪刚,朱丽菊,等,混凝土再生胶凝材料的活性试验研究,贵州师范大学学报(自然科学版),2018,36(5):42-47+53.
[4]吴福飞,邓洪刚,董双快,等.轻烧MgO活性的影响因素研究[J].贵州师范大学学报(自然科学版),2018,36(1):96-100.
[5]NAZARI A,RIAHI S.Al2O3nanoparticles in concrete and different curing media[J].Energy&Buildings,2011,43(6):1480-1488.
[6]NAZARI A,RIAHI S.Improvement compressive strength of concrete in different curing media by Al2O3nanoparticles[J].Materials Science&Engineering:A(Structural Materials:Properties,Microstructure and Processing),2011,528(3):1183-1191.
[7]NAZARI A,RIAHI S.Effects of Al2O3nanoparticles on properties of self compacting concrete with ground granulated blast furnace slag(GGBFS)as binder[J].Science China,2011,54(9):2327-2338.
[8]AREFI M R,JAVERI M R,MOLLAAHMADI E.To study the effect of adding Al2O3nanoparticles on the mechanical properties and microstructure of cement mortar[J].Life Science Journal,2011,8(4):613-617.
[9]LI Zhenhua,WANG Huafeng,HE Shan,et al.Investigations on the preparation and mechanical properties of the nano-alumina reinforced cement composite[J].Materials Letters,2006,60(3):356-359.
[10]NAZARI A,RIAHI S,RIAHI S,et al.Mechanical properties of cement mortar with Al2O3nanoparticles[J].Journal of American Science,2010,6(4):94-97.
[11]CAMPILLO I,GUERRERO A,DOLADO J S,et al.Improvement of initial mechanical strength by nanoalumina in belite cements[J].Mater Lett,2007,61(8-9):1889-1892.
[12]OLTULU M,SAHIN R.Single and combined effects of nano-Si O2,nano-Al2O3and nano-Fe2O3powders on compressive strength and capillary permeability of cement mortar containing silica fume[J].Materials Science and Engineering:A,2011,528(22-23):7012-7019.
[13]OLTULU M,SAHIN R.Effect of nano-Si O2,nanoAl2O3and nano-Fe2O3powders on compressive strengths and capillary water absorption of cement mortar containing fly ash:A comparative study[J].Energy and Buildings,2013,58:292-301.
[14]HEIKAL M,ISMAIL M N.Physico-mechanical,microstructure characteristics and fire resistance of cement pastes containing Al2O3nano-particles[J].Construction and Building Materials,2015,91:232-242
[15]BARBHUIYA S,MUKHERJEE S.Effects of nanoAl2O3on early-age microstructural properties of cement paste[J].Construction and Building Materials,2014,52:189-193.
[16]NAZARI A,RIAHI S.Abrasion resistance of concrete containing Si O2and Al2O3nanoparticles in different curing media[J].Energy and Buildings,2011,43(10):2939-2946.
[17]HE Xiaodong,SHI Xianming.Chloride permeability and microstructure of Portland cement mortars incorporating nanomaterials[J].Transportation Research Record:Journal of the Transportation Research Board,2008(2070):13-21.