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研究了M140砂浆、定向多壁碳纳米管-M140砂浆复合材料的制备及其压缩、弯曲性能和折断面显微结构.使用市售普通材料通过变速搅拌工艺在常温水浴养护下制得M140砂浆,该砂浆强度尺寸效应不明显、后期增长缓慢;对定向多壁碳纳米管(A-MWNTs)的羰基化分散体和水分散体两种分散体增强M140砂浆进行了对比研究.添加0.01%(质量分数)的A-MWNTs后,A-MWNTs羰基化分散体-M140砂浆复合材料的抗折强度、抗压强度分别比相同条件下制得的M140砂浆的增加了5.4%,8.4%.而A-MWNTs水分散体-M140砂浆复合材料的抗折强度、抗压强度分别比相同条件下制得的M140砂浆的增加了20.7%,15.9%.对A-MWNTs水分散体-M140砂浆复合材料断面显微分析得出碳纳米管与砂浆基体间界面结合适中;增强机理主要是碳纳米管对M140砂浆空隙的显微填料效应和碳纳米管的拔出、脱粘.在本文的研究中碳纳米管的水分散体与砂浆相容性好.
The preparation of M140 mortar, oriented multi-walled carbon nanotubes-M140 mortar composites and its compressive, flexural properties and fracture surface microstructure were studied.M140 mortar was prepared under normal temperature bath by variable speed stirring process using common commercial materials, The strength and size effect of the mortar is not obvious, the slow increase in the late growth of carbon nanotubes (MWNTs) oriented carbon nanotube dispersion (A) and aqueous dispersion of two dispersions enhanced M140 mortar were compared .0.01% (mass Fraction) of A-MWNTs, the flexural strength and compressive strength of A-MWNTs carbonylation dispersion-M140 mortar composites were 5.4% and 8.4% higher than that of M140 mortar prepared under the same conditions, respectively.A- The flexural strength and compressive strength of MWNTs -M140 mortar composites increased by 20.7% and 15.9%, respectively, than the M140 mortar prepared under the same conditions. The cross-section of the A-MWNTs aqueous dispersions-M140 mortar composites Microanalysis shows that the interface between carbon nanotubes and mortar matrix is moderately bonded, and the enhancement mechanism is mainly the effect of carbon nanotubes on the microsphere packing effect and the pulling-out and debonding of carbon nanotubes in the gap of M140 mortar.In this study, Aqueous dispersion Mortar good compatibility.