Hassan Hassan Soltan, Elshimy Ahmed S, Israde-Alcantara Isabel, Abdel-Gawwad Hamdy A, Pfeiffer Heriberto
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior s/n, Ciudad Universitaria, Del. Coyoacán, Ciudad de México 04510, Mexico.
Geology Department, Faculty of Science, New Valley University, El- Kharga 72511, Egypt.
ACS Omega. 2025 Jan 17;10(3):2640-2657. doi: 10.1021/acsomega.4c07737. eCollection 2025 Jan 28.
A cleaner production approach was employed to develop an innovative and eco-friendly, fire-resistant composite material that boasts exceptional mechanical performance and is capable of withstanding harsh conditions. Novel obsidian (OB) and metakaolin (MK) were individually mixed with NaOH at different ratios ranging from 8 to 12 wt %. Each material was subjected to only 80 °C, forming alkali-activated obsidian (AAOB) and metakaolin-based geopolymer (MKBG). Extensive analyses, including compressive strength, thermal conductivity, X-ray diffraction (XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis, confirmed the performance of both AAOB and MKBG. The AAOB outshined MKBG in fire resistance and mechanical strength, boasting impressive compressive strengths of 36.5, 69, and 101 MPa, respectively at day one. In contrast, MKBG lagged behind, with compressive strengths of 9.1, 23.24, and 25.66 MPa under the same conditions. Furthermore, AAOB exhibited a significantly higher porosity (80%) at 1000 °C and a lower thermal conductivity of 0.193 W/mK, compared to MKBG, which possessed a lower porosity (33%) and higher thermal conductivity of 0.901 W/mK. The AAOB represents a significant leap in the green revolution for sustainable fire-resistant composite materials. Its versatility extends across various sectors, notably in ultrahigh-temperature industrial and construction applications.
采用清洁生产方法开发了一种创新且环保的耐火复合材料，该材料具有卓越的机械性能，能够承受恶劣条件。将新型黑曜石（OB）和偏高岭土（MK）分别与NaOH按8%至12%重量比进行混合。每种材料仅在80°C下进行处理，形成碱激发黑曜石（AAOB）和偏高岭土基地质聚合物（MKBG）。通过抗压强度、热导率、X射线衍射（XRD）、X射线荧光（XRF）、热重分析（TGA）、傅里叶变换红外（FTIR）光谱、扫描电子显微镜（SEM）和能量色散X射线（EDX）分析等广泛分析，证实了AAOB和MKBG的性能。AAOB在耐火性和机械强度方面优于MKBG，在第一天时其抗压强度分别令人印象深刻地达到36.5、69和101MPa。相比之下，MKBG则落后，在相同条件下抗压强度为9.1、23.24和25.66MPa。此外，与MKBG相比，AAOB在1000°C时孔隙率显著更高（80%），热导率更低，为0.193W/mK，而MKBG孔隙率更低（33%），热导率更高，为0.901W/mK。AAOB代表了可持续耐火复合材料绿色革命的重大飞跃。其通用性延伸到各个领域，特别是在超高温工业和建筑应用中。
