Malumyan Suren A, Muradyan Nelli G, Kalantaryan Marine A, Arzumanyan Avetik A, Melikyan Yeghvard, Laroze David, Barseghyan Manuk G
Faculty of Construction, National University of Architecture and Construction of Armenia, 105 Teryan Street, Yerevan 0009, Armenia.
A.B. Nalbandyan Institute of Chemical Physics, NAS RA, 5/2P. Sevak Street, Yerevan 0014, Armenia.
Nanomaterials (Basel). 2024 Jul 29;14(15):1271. doi: 10.3390/nano14151271.
In this work, the effect of multi-walled carbon nanotubes (MWCNT1, MWCNT2, and MWCNT3) with different outer diameters and specific surface areas on the mechanical and electrical properties of cement mortar have been investigated. Various concentrations of MWCNTs were used (0.05, 0.10, and 0.15%), the effective dispersion of which was carried out by an Ultrasonic machine (for 40 min with 160 W power and a 24 kHz frequency) using a surfactant. Composites have been processed with a biosilica content of 10% by weight of cement and without it. Compressive strength tests were carried out on days 7 and 28 of curing. The 7-day compressive strength of samples prepared without biosilica increased compared to the result of the control sample (6.4% for MWCNT1, 7.4% for MWCNT2, and 10.8% for MWCNT3), as did those using biosilica (6.7% in the case of MWCNT1, 29.2% for MWCNT2, and 2.1% for MWCNT3). Compressive strength tests of 28-day specimens yielded the following results: 21.7% for MWCNT1, 3.8% for MWCNT2, and 4.2% for MWCNT3 in the absence of biosilica and 8.5%, 12.6%, and 6.3% with biosilica, respectively. The maximum increase in compressive strength was observed in the composites treated with a 0.1% MWCNT concentration, while in the case of 0.05 and 0.15% concentrations, the compressive strengths were relatively low. The MWCNT-reinforced cement matrix obtained electrical properties due to the high electrical conductivity of these particles. The effect of MWCNT concentrations of 0.05, 0.10, and 0.15 wt% on the electrical properties of cement mortar, especially the bulk electrical resistivity and piezoresistive characteristics of cement mortar, was studied in this work. At a concentration of 0.05%, the lowest value of resistivity was obtained, and then it started to increase. The obtained results show that all investigated specimens have piezoresistive properties and that the measurements led to a deviation in fractional change in resistivity.
在本研究中，研究了具有不同外径和比表面积的多壁碳纳米管（MWCNT1、MWCNT2和MWCNT3）对水泥砂浆力学和电学性能的影响。使用了不同浓度的多壁碳纳米管（0.05%、0.10%和0.15%），通过超声波机器（功率160W，频率24kHz，处理40分钟）并添加表面活性剂实现其有效分散。制备了水泥重量含量为10%含生物二氧化硅和不含生物二氧化硅的复合材料。在养护第7天和第28天进行抗压强度试验。未添加生物二氧化硅制备的样品在7天时的抗压强度相比对照样品有所提高（MWCNT1提高6.4%，MWCNT2提高7.4%，MWCNT3提高10.8%），添加生物二氧化硅的样品也是如此（MWCNT1提高6.7%，MWCNT2提高29.2%，MWCNT3提高2.1%）。28天龄期试件的抗压强度试验结果如下：未添加生物二氧化硅时，MWCNT1为21.7%，MWCNT2为3.8%，MWCNT3为4.2%；添加生物二氧化硅时，分别为8.5%、12.6%和6.3%。抗压强度的最大增幅出现在多壁碳纳米管浓度为0.1%的复合材料中，而在0.05%和0.15%浓度时，抗压强度相对较低。由于这些颗粒的高导电性，多壁碳纳米管增强水泥基体获得了电学性能。本研究考察了0.05%、0.10%和0.15%重量百分比的多壁碳纳米管浓度对水泥砂浆电学性能的影响，特别是水泥砂浆的体积电阻率和压阻特性。在浓度为0.05%时，获得了最低的电阻率值，然后开始上升。所得结果表明，所有研究的试件都具有压阻特性，并且测量导致电阻率分数变化出现偏差。
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