Effects of Carbon Nanotubes on Mechanical and 2D-3D Microstructure Properties of Cement Mortar
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2014年第3期
论文作者：刘巧玲 SUN Wei JIANG Hao WANG Caihui
文章页码：513 - 517
摘 要：To study the influence of multi-wall carbon nanotubes（MWCNTs） on the mechanical and microstructural properties of cementitious composites, 0.00, 0.02, 0.08, 0.10, and 0.20 wt% of multi-wall carbon nanotubes were added into cement mortar, in which the cement-sand ratio was 1:1.5. The fl exural and compressive strengths of cement mortar at the age of 3, 7, 28 and 90 d and the fracture performance at the age of 28 d were determined, its 2D micrograph was tested by means of SEM, and the 3D defects distribution was fi rstly determined with or without CNTs by means of XCT（X-ray computerized tomography）. The results showed that 0.08 wt% of CNTs improved the compressive strength and flexural strength by 18% and 19%, respectively, and a significant improvement of its fracture property was observed. Moreover lower addition of carbon nanotubes to cement mortars can improve its microstructure and decrease the defects signifi cantly compared to the cement mortar without CNTs. With the increase of the content of CNTs, the mechanical properties of cement mortars presented to be declined largely due to the agglomeration of CNTs.
刘巧玲1,2，SUN Wei1，JIANG Hao2，WANG Caihui1
1. School of Materials Science and Engineering, Southeast University2. School of Civil Engineering, Shandong Jianzhu University
摘 要：To study the influence of multi-wall carbon nanotubes（MWCNTs） on the mechanical and microstructural properties of cementitious composites, 0.00, 0.02, 0.08, 0.10, and 0.20 wt% of multi-wall carbon nanotubes were added into cement mortar, in which the cement-sand ratio was 1:1.5. The fl exural and compressive strengths of cement mortar at the age of 3, 7, 28 and 90 d and the fracture performance at the age of 28 d were determined, its 2D micrograph was tested by means of SEM, and the 3D defects distribution was fi rstly determined with or without CNTs by means of XCT（X-ray computerized tomography）. The results showed that 0.08 wt% of CNTs improved the compressive strength and flexural strength by 18% and 19%, respectively, and a significant improvement of its fracture property was observed. Moreover lower addition of carbon nanotubes to cement mortars can improve its microstructure and decrease the defects signifi cantly compared to the cement mortar without CNTs. With the increase of the content of CNTs, the mechanical properties of cement mortars presented to be declined largely due to the agglomeration of CNTs.
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