Stevulova Nadezda, Junak Jozef, Vaclavik Vojtech
Department of Material Engineering/Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice; Vysokoskolska 4, 042 00 Kosice, Slovakia.
Department of Environmental Engineering and Institute of Clean Technologies for Extraction and Utilization of Energy Resources, Faculty of Mining and Geology, VSB-Technical University of Ostrava; 17. Listopadu 2172/15, 708 33 Ostrava-Poruba, Czech Republic.
Materials (Basel). 2018 Nov 1;11(11):2153. doi: 10.3390/ma11112153.
This experimental study was focused on the application of an alternative binder based on MgO, and the variation of its components by the combination of two MgO products obtained by the calcinations of natural magnesite, siliceous materials (river sand and silica fume), and alkaline admixture in the mixture for a preparation of composite based on biomass waste such as hemp hurds as organic filler. This paper presents the results of the effect of an MgO binder composition on the compressive strength of the bio-aggregate-based composites. Other physical properties, such as the bulk density, thermal conductivity coefficient, and water absorption, were also investigated. The measured strength parameters of the bio-composite samples that were hardened for 28 days demonstrate that the binder consisting of optimal calcined MgO and silica fume as a total replacement for sand ensures a good binding of the matrix with hemp hurd compared to other varied compositions of alternative binder. No significant differences in bulk density and thermal conductivity values were found for these composites. However, the bio-composite specimen with an MgO⁻SiO₂ matrix had the highest compressive strength and achieved the lowest value of water absorption. An increase in hardening time of up to 90 days led to a significant improvement of strength as well as reduction in permeability.
本实验研究聚焦于一种基于氧化镁的替代粘结剂的应用，以及通过将天然菱镁矿煅烧得到的两种氧化镁产品、硅质材料（河砂和硅灰）和碱性外加剂在用于制备以大麻秸秆等生物质废料为有机填料的复合材料的混合物中进行组合，来改变其成分。本文展示了氧化镁粘结剂组成对生物骨料基复合材料抗压强度的影响结果。还研究了其他物理性能，如堆积密度、导热系数和吸水率。对硬化28天的生物复合材料样品测得的强度参数表明，与替代粘结剂的其他不同组成相比，由最佳煅烧氧化镁和硅灰完全替代沙子组成的粘结剂能确保基体与大麻秸秆良好粘结。这些复合材料的堆积密度和导热系数值没有显著差异。然而，具有MgO⁻SiO₂基体的生物复合材料试样具有最高的抗压强度，且吸水率最低。硬化时间延长至90天导致强度显著提高以及渗透性降低。
