Kostrzanowska-Siedlarz Aleksandra, Musioł Krzysztof, Ponikiewski Tomasz, Janas Dawid, Kampik Marian
Faculty of Civil Engineering, Silesian University of Technology, Akademicka 5, 44-100 Gliwice, Poland.
Faculty of Electrical Engineering, Silesian University of Technology, Akademicka 10, 44-100 Gliwice, Poland.
Materials (Basel). 2024 Oct 11;17(20):4972. doi: 10.3390/ma17204972.
One of the ways to turn concrete into smart concrete involves the incorporation of conductive fillers. These fillers should be evenly distributed in the matrix to enable the charge propagation necessary for sensing. To homogenize the mixture, typical surface-active chemical compounds are routinely employed. Unfortunately, their presence often negatively impacts the characteristics of concrete. In this work, we show that conductive multi-walled carbon nanotubes (MWCNTs) can be included in the concrete matrix by using off-the-shelf lignosulfonate-based plasticizers. These plasticizers showed a much-improved capability to disperse MWCNTs compared to other routinely used surfactants. They also prevented a significant deterioration of the consistency of the mixture and inhibited the acceleration of the hydration process by MWCNTs. In concretes with MWCNTs and lignosulfonate-based plasticizers, the mechanical properties were largely preserved, while the nanocomposite became electrically conductive. Consequently, it enabled evaluation of the condition of the material by electrical impedance measurements.
将混凝土转变为智能混凝土的方法之一是加入导电填料。这些填料应均匀分布在基体中，以实现传感所需的电荷传播。为使混合物均匀，通常会使用典型的表面活性化合物。不幸的是，它们的存在常常对混凝土的特性产生负面影响。在这项工作中，我们表明，通过使用现成的木质素磺酸盐基增塑剂，可以将导电多壁碳纳米管（MWCNT）纳入混凝土基体中。与其他常用表面活性剂相比，这些增塑剂表现出显著提高的分散MWCNT的能力。它们还防止了混合物稠度的显著恶化，并抑制了MWCNT对水化过程的加速作用。在含有MWCNT和木质素磺酸盐基增塑剂的混凝土中，力学性能基本得以保留，而纳米复合材料则具有导电性。因此，它能够通过电阻抗测量来评估材料的状况。
