多壁碳纳米管对粉煤灰混凝土的力学和耐久性能的影响

TU528.01; 以聚乙烯吡咯烷酮(PVP)作为分散剂,结合超声工艺对多壁碳纳米管(MWCNTs)进行分散处理,配置出MWCNTs水性分散液,并将其作为掺杂相制备了粉煤灰混凝土,通过TEM、XRD、SEM、FT-IR、力学性能测试和快速冻融实验等方式研究了多壁碳纳米管掺量对粉煤灰混凝土的力学和耐久性能的影响.结果表明,PVP结合超声工艺能够有效分散MWCNTs,粉煤灰混凝土中加入MWCNTs能够加速水泥水化反应的进行,提高C-S-H和Ca(OH)2等水化产物的生成量.适量的MWCNTs掺杂后能够细化水泥内部孔结构,减少裂纹和大尺寸孔洞的数量,使粉煤灰混凝土的破坏形式由脆性断裂转变为韧性断裂....

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Published in功能材料 Vol. 55; no. 9; pp. 9229 - 9236
Main Authors 吴亚敏, 段君峰, 张莉, 侯风
Format Journal Article
LanguageChinese
Published 郑州工业应用技术学院建筑工程学院,郑州 451100%江苏海洋大学土木与港海工程学院,江苏连云港 222005 30.09.2024
Subjects
力学性能
frost resistance
分散剂
抗冻性能
fly ash concrete
dispersant
粉煤灰混凝土
mechanical properties
多壁碳纳米管
multi-walled carbon nanotubes
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ISSN1001-9731
DOI10.3969/j.issn.1001-9731.2024.09.029

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Abstract TU528.01; 以聚乙烯吡咯烷酮(PVP)作为分散剂,结合超声工艺对多壁碳纳米管(MWCNTs)进行分散处理,配置出MWCNTs水性分散液,并将其作为掺杂相制备了粉煤灰混凝土,通过TEM、XRD、SEM、FT-IR、力学性能测试和快速冻融实验等方式研究了多壁碳纳米管掺量对粉煤灰混凝土的力学和耐久性能的影响.结果表明,PVP结合超声工艺能够有效分散MWCNTs,粉煤灰混凝土中加入MWCNTs能够加速水泥水化反应的进行,提高C-S-H和Ca(OH)2等水化产物的生成量.适量的MWCNTs掺杂后能够细化水泥内部孔结构,减少裂纹和大尺寸孔洞的数量,使粉煤灰混凝土的破坏形式由脆性断裂转变为韧性断裂.MWCNTs-0.3％试样的载荷峰值和形变量达到最大值,分别为41.6 kN和2.92 mm;抗压强度和抗折强度达到最大值,分别为60.5和11.2 MPa.经过100次快速冻融循环后,MWCNTs-0.3％试样的质量损失率为最低值0.271％,相对动弹性模量最大为84.34％,抗冻性能提升显著.
AbstractList TU528.01; 以聚乙烯吡咯烷酮(PVP)作为分散剂,结合超声工艺对多壁碳纳米管(MWCNTs)进行分散处理,配置出MWCNTs水性分散液,并将其作为掺杂相制备了粉煤灰混凝土,通过TEM、XRD、SEM、FT-IR、力学性能测试和快速冻融实验等方式研究了多壁碳纳米管掺量对粉煤灰混凝土的力学和耐久性能的影响.结果表明,PVP结合超声工艺能够有效分散MWCNTs,粉煤灰混凝土中加入MWCNTs能够加速水泥水化反应的进行,提高C-S-H和Ca(OH)2等水化产物的生成量.适量的MWCNTs掺杂后能够细化水泥内部孔结构,减少裂纹和大尺寸孔洞的数量,使粉煤灰混凝土的破坏形式由脆性断裂转变为韧性断裂.MWCNTs-0.3％试样的载荷峰值和形变量达到最大值,分别为41.6 kN和2.92 mm;抗压强度和抗折强度达到最大值,分别为60.5和11.2 MPa.经过100次快速冻融循环后,MWCNTs-0.3％试样的质量损失率为最低值0.271％,相对动弹性模量最大为84.34％,抗冻性能提升显著.
Abstract_FL Polyvinylpyrrolidone(PVP)was used as a dispersant and combined with ultrasonic technology to dis-perse multi walled carbon nanotubes(MWCNTs).A water-based dispersion of MWCNTs was prepared,and it was used as a doping phase to prepare fly ash concrete.The influence of multi walled carbon nanotube content on the mechanical and durability properties of fly ash concrete was studied through TEM,XRD,SEM,FT-IR,mechanical performance testing and rapid freeze-thaw experiments.The results indicated that PVP combined with ultrasonic technology could effectively disperse MWCNTs,and the addition of MWCNTs to fly ash con-crete could accelerate the cement hydration reaction and increase the generation of hydration products such as C-S-H and Ca(OH)2.Moderate doping of MWCNTs could refine the internal pore structure of cement,reduce the number of cracks and large-sized pores,and transform the failure mode of fly ash concrete from brittle fracture to ductile fracture.The peak load and deformation of the MWCNTs-0.3％specimen reached their maximum val-ues,which were 41.6 kN and 2.92 mm,respectively.The compressive strength and flexural strength reached their maximum values,which were 60.5 and 11.2 MPa,respectively.After 100 rapid freeze-thaw cycles,the mass loss rate of the MWCNTs-0.3％sample was the lowest value of 0.271％,and the maximum relative dy-namic elastic modulus was 84.34％,indicating a significant improvement in frost resistance.
Author 段君峰
张莉
侯风
吴亚敏
AuthorAffiliation 郑州工业应用技术学院建筑工程学院,郑州 451100%江苏海洋大学土木与港海工程学院,江苏连云港 222005
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Author_FL ZHANG Li
HOU Feng
WU Yamin
DUAN Junfeng
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Issue 9
Keywords 力学性能
frost resistance
分散剂
抗冻性能
fly ash concrete
dispersant
粉煤灰混凝土
mechanical properties
多壁碳纳米管
multi-walled carbon nanotubes
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Publisher 郑州工业应用技术学院建筑工程学院,郑州 451100%江苏海洋大学土木与港海工程学院,江苏连云港 222005
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Title 多壁碳纳米管对粉煤灰混凝土的力学和耐久性能的影响
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