Melichar Tomas, Bydzovsky Jiri, Dvorak Richard, Topolar Libor, Keprdova Sarka
Institute of Technology of Building Materials and Components, Faculty of Civil Engineering, Brno University of Technology, 602 00 Brno, Czech Republic.
Institute of Physics, Faculty of Civil Engineering, Brno University of Technology, 602 00 Brno, Czech Republic.
Materials (Basel). 2021 Nov 10;14(22):6788. doi: 10.3390/ma14226788.
This article presents research on the behavior of cement-bonded particleboards under mechanical stress caused by the static load. The composition of the boards was modified using alternative raw materials-dust (DU) forming during the processing of cement-fibre boards and particle mixture (PM) generated in the production of cement-bonded particleboards. The particleboards (1-year-old) were subjected to an adverse environment (100 to 250 frost cycles). Mechanical parameters were tested, and the development of defects during static load of the boards by bending was analyzed using acoustic emission. Particleboards with modified compositions are slightly more resistant to adverse environments. The results of the acoustic emission showed the different types of defects occurring under stress by bending. Standard-composition particleboards showed defects located mainly under the cylindrical stress-test head. The modified boards showed larger location distribution of the occurring defects that were also concentrated further away from the cylindrical stress head. The energy during the occurrence of defects was higher in the modified boards in the location of weight application than in the reference boards.
本文介绍了关于水泥刨花板在静载引起的机械应力作用下行为的研究。使用替代原材料对板材成分进行了改性，这些替代原材料是在水泥纤维板加工过程中形成的粉尘（DU）以及在水泥刨花板生产过程中产生的颗粒混合物（PM）。对这些刨花板（使用一年）进行了恶劣环境（100至250次冻融循环）试验。测试了机械参数，并通过声发射分析了板材在弯曲静载过程中缺陷的发展情况。成分改性的刨花板对恶劣环境的抵抗力略强。声发射结果显示了弯曲应力作用下出现的不同类型缺陷。标准成分刨花板的缺陷主要位于圆柱形应力测试头下方。改性板材出现缺陷的位置分布更广，且这些缺陷也更集中在远离圆柱形应力头的地方。在施加重量的位置，改性板材出现缺陷时的能量高于参考板材。
