Cobîrzan Nicoleta, Thalmaier Gyorgy, Balog Anca-Andreea, Constantinescu Horia, Ceclan Andrei, Nasui Mircea
Department of Civil Engineering and Management, Faculty of Civil Engineering, Technical University of Cluj-Napoca, 25 Baritiu Street, 400624 Cluj-Napoca, Romania.
Department of Materials Science and Engineering, Faculty of Materials and Environmental Engineering, Technical University of Cluj-Napoca, 103 Muncii blv., 400624 Cluj-Napoca, Romania.
Materials (Basel). 2021 Nov 15;14(22):6872. doi: 10.3390/ma14226872.
The present work examines an innovative manufacturing technique for fired clay bricks, using tuff as a secondary raw material. Samples were made of clay and tuff (0-30 wt.%) fired at 900 to 1100 °C. The chemical and mineralogical compositions and physical and thermal analyses of raw materials were investigated by using SEM-EDS, RX and DTA-TG curves. The samples were analysed from the mineralogical, technological and mechanical points of view. The result show that the tuff's presence in the clay mixtures considerably reduced the shrinkage of the product during the firing process, and the manufactured samples were of excellent quality. The compressive strength of the bricks varied from 5-35.3MPa, being influenced by the tuff content, clay matrix properties and firing temperatures. Finally, the heat demand for increasing the temperature from room to the firing temperature of the sample with 10% tuff content was 22%.
本研究探讨了一种以凝灰岩为二次原料烧制粘土砖的创新制造技术。样品由粘土和凝灰岩（0 - 30重量%）制成，在900至1100°C下烧制。通过扫描电子显微镜-能谱仪（SEM-EDS）、X射线衍射（RX）和差示扫描量热-热重曲线（DTA-TG）对原材料的化学和矿物成分以及物理和热性能进行了研究。从矿物学、工艺和力学角度对样品进行了分析。结果表明，凝灰岩在粘土混合物中的存在显著降低了烧制过程中产品的收缩率，且制成的样品质量优异。砖的抗压强度在5 - 35.3MPa之间变化，受凝灰岩含量、粘土基体性能和烧制温度的影响。最后，将含10%凝灰岩的样品从室温加热到烧制温度所需的热量为22%。
