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矿渣与粉煤灰掺量对高延性水泥基复合材料力学性能与应变硬化特性的影响
Effects of Dosage of Slag and Fly Ash on Mechanical Properties and Strain-hardening Characteristics of High-ductility Cementitou
2015年第11期
高延性水泥基复合材料;高炉矿渣;力学性能;弯曲韧性;多缝开裂
High-ductility cementitious composites; Blast furnace slag; Mechanical properties; Flexural toughness; Multiple cracking
2015年第11期
1000-4637(2015)11-12-04
国家自然科学基金面上项目(51378113);校企合作项目(8512000268);江苏省自然科学基金(BK20151072);中央级公益性科研院所基本科研业务费专项资金(Y414001)
郭丽萍1,2,3,谌正凯1,杨亚男1,陈 波4
1.东南大学材料科学与工程学院,南京211189;2.先进土木工程材料协同创新中心,南京211189; 3.江苏省土木工程材料重点实验室,南京211189;4.南京水利科学研究院水文水资源 与水利工程科学国家重点实验室,210029

郭丽萍1,2,3,谌正凯1,杨亚男1,陈 波4

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摘 要:高延性水泥基复合材料(High Ductility Cementitious Composites,HDCC)是指在弯曲和拉伸荷载作用下具有应变硬化特性的水泥基复合材料,具有单轴拉伸延性好,耐久性能优异等优点。在材料设计中用大掺量的粉煤灰来替代水泥,以实现更加优异的高延性。本文研究了在聚乙烯醇(polyvinyl alcohol,PVA)纤维体积掺量为1.2%和1.4%时,同时掺入高炉矿渣与粉煤灰制备高延性水泥基复合材料,通过改变高炉矿渣与粉煤灰的掺量,得到试件的抗压强度、抗折强度与弯曲韧性,用以对比矿渣与粉煤灰不同质量比例对高延性水泥基复合材料力学性能、弯曲韧性和表面裂纹特征的影响规律。结果显示,当矿渣和粉煤灰掺量分别为总胶凝材料质量的40%和10%时,试件呈现出良好的应变硬化与多缝开裂特性,最大挠度达到10.79mm,极限拉应变为1.26%,裂纹数量达到14条。表明了矿渣的掺入有利于在保证高延性水泥基复合材料具有应变硬化特性的前提下,可以有效提高高延性水泥基复合材料中的强度和弯曲韧性,对于此类材料的工程应用十分有益。 Abstract: High-ductility cementitious composites (HDCC) refers to the cementitious composites with strain hardening properties under bending and tension loading, which has good uniaxial tensile ductility, excellent durability, etc. High content of fly ash is used to replace the cement in order to achieve more excellent ductility. In this study, the volume content of PVA fiber was 1.2% and 1.4%, the blast furnace slag and fly ash added into HDCC. By changing the blast furnace slag and fly ash content, the compressive strength, flexural strength and flexural toughness of specimen obtained to reveal the influence of different mass ratio of slag and fly ash on the mechanical properties, toughness and surface crack characteristics of HDCC. The results showed that when the slag and fly ash were 40% and 10% of the total mass of cementitious materials, the specimen showed a good strain hardening and multiple cracking characteristics, maximum deflection reached 10.79mm, tensile strain capacity of 1.26% and the number of cracks was 14. The incorporation of slag was beneficial to ensure the high ductility of HDCC and effectively improved the strength and flexural toughness of HDCC, which was very useful for engineering applications of these materials.
英文名 : Effects of Dosage of Slag and Fly Ash on Mechanical Properties and Strain-hardening Characteristics of High-ductility Cementitou
刊期 : 2015年第11期
关键词 : 高延性水泥基复合材料;高炉矿渣;力学性能;弯曲韧性;多缝开裂
Key words : High-ductility cementitious composites; Blast furnace slag; Mechanical properties; Flexural toughness; Multiple cracking
刊期 : 2015年第11期
DOI :
文章编号 : 1000-4637(2015)11-12-04
基金项目 : 国家自然科学基金面上项目(51378113);校企合作项目(8512000268);江苏省自然科学基金(BK20151072);中央级公益性科研院所基本科研业务费专项资金(Y414001)
作者 : 郭丽萍1,2,3,谌正凯1,杨亚男1,陈 波4
单位 : 1.东南大学材料科学与工程学院,南京211189;2.先进土木工程材料协同创新中心,南京211189; 3.江苏省土木工程材料重点实验室,南京211189;4.南京水利科学研究院水文水资源 与水利工程科学国家重点实验室,210029

郭丽萍1,2,3,谌正凯1,杨亚男1,陈 波4

摘要
参数
结论
参考文献
引用本文

摘   要:高延性水泥基复合材料(High Ductility Cementitious Composites,HDCC)是指在弯曲和拉伸荷载作用下具有应变硬化特性的水泥基复合材料,具有单轴拉伸延性好,耐久性能优异等优点。在材料设计中用大掺量的粉煤灰来替代水泥,以实现更加优异的高延性。本文研究了在聚乙烯醇(polyvinyl alcohol,PVA)纤维体积掺量为1.2%和1.4%时,同时掺入高炉矿渣与粉煤灰制备高延性水泥基复合材料,通过改变高炉矿渣与粉煤灰的掺量,得到试件的抗压强度、抗折强度与弯曲韧性,用以对比矿渣与粉煤灰不同质量比例对高延性水泥基复合材料力学性能、弯曲韧性和表面裂纹特征的影响规律。结果显示,当矿渣和粉煤灰掺量分别为总胶凝材料质量的40%和10%时,试件呈现出良好的应变硬化与多缝开裂特性,最大挠度达到10.79mm,极限拉应变为1.26%,裂纹数量达到14条。表明了矿渣的掺入有利于在保证高延性水泥基复合材料具有应变硬化特性的前提下,可以有效提高高延性水泥基复合材料中的强度和弯曲韧性,对于此类材料的工程应用十分有益。

Abstract: High-ductility cementitious composites (HDCC) refers to the cementitious composites with strain hardening properties under bending and tension loading, which has good uniaxial tensile ductility, excellent durability, etc. High content of fly ash is used to replace the cement in order to achieve more excellent ductility. In this study, the volume content of PVA fiber was 1.2% and 1.4%, the blast furnace slag and fly ash added into HDCC. By changing the blast furnace slag and fly ash content, the compressive strength, flexural strength and flexural toughness of specimen obtained to reveal the influence of different mass ratio of slag and fly ash on the mechanical properties, toughness and surface crack characteristics of HDCC. The results showed that when the slag and fly ash were 40% and 10% of the total mass of cementitious materials, the specimen showed a good strain hardening and multiple cracking characteristics, maximum deflection reached 10.79mm, tensile strain capacity of 1.26% and the number of cracks was 14. The incorporation of slag was beneficial to ensure the high ductility of HDCC and effectively improved the strength and flexural toughness of HDCC, which was very useful for engineering applications of these materials.

关键词:
高延性水泥基复合材料;高炉矿渣;力学性能;弯曲韧性;多缝开裂
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(1)矿渣与粉煤灰质量掺量分别为胶凝材料总质量的40%和10%、PVA纤维体积掺量为1.2%时,HDCC表现出最佳的延性,其最大挠度达到10.79mm,极限拉应变达到1.26%,在最经济的条件下具有优异的工程实用价值。
(2)在PVA纤维体积掺量为1.4%时,增加粉煤灰掺量同时降低矿渣掺量,可提高HDCC的最大跨中挠度与极限拉应变,但同时会降低HDCC的抗折强度与抗压强度,在实际工程应用中,可根据实际情况,合理选择矿渣与粉煤灰掺量。
(3)建立了弯曲应力-拉伸应变的本构方程,四组系列的修正决定系数均在0.84以上,与多项式拟合程度良好,可以很好地反映出弯曲应力与拉伸应变之间的关系。
[1] Zhou J, Qian S, Beltran M G S, et al. Development of engineered cementitious composites with limestone powder and blast furnace slag[J]. Materials and Structures, 2010, 43(6): 803-814.
[2] Оzbay E, Karahan O, Lachemi M, et al. Dual effectiveness of freezing–thawing and sulfate attack on high-volume slag-incorporated ECC[J]. Composites Part B: Engineering, 2013, 45(1): 1384-1390.
[3] Kim J K, Kim J S, Ha G J, et al. Tensile and fiber dispersion performance of ECC (engineered cementitious composites) produced with ground granulated blast furnace slag[J]. Cement and Concrete Research, 2007, 37(7): 1096-1105.
[4] Zhu Y, Yang Y, Yao Y. Use of slag to improve mechanical properties of engineered cementitious composites (ECCs) with high volumes of fly ash[J]. Construction and Building Materials, 2012, 36: 1076-1081.
[5] 罗百福. 绿色高韧性纤维增强水泥基复合材料的研究[D]. 哈尔滨:哈尔滨工业大学, 2008.
[6] 祝瑜, 杨英姿, 高小建, 等. 养护温度对高延性水泥基材料力学性能的影响[J]. 深圳大学学报:理工版, 2011, 28(1): 72-77.
[7] 蔡向荣, 徐世烺. UHTCC薄板弯曲荷载-变形硬化曲线与单轴拉伸应力-应变硬化曲线对应关系研究[J]. 工程力学, 2010, 27(1): 8-16.
[8] Huang X Y, Ranade R, Li V C, et al. Development of green engineered cementitious composites using iron ore tailings as aggregates[J]. Construction and Building Materials, 2013, 44: 757-764.

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