Hachem Houda, Mehrez Insaf, Boumnijel Ibtissem, Jemni Abdelmajid, Mihoubi Daoued
Research and Technology Centre of Energy (CRTEn), Hammam Lif 2050, Tunisia.
National Engineering School of Monastir (ENIM), LESTE Laboratory, University of Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia.
ACS Omega. 2023 Mar 21;8(13):12039-12051. doi: 10.1021/acsomega.2c07818. eCollection 2023 Apr 4.
Earlier research suggested using ash to substitute cement, whereas other studies looked at the possibility of using plant-derived agricultural wastes as fiber reinforcement in cement applications. This study offered an environmentally friendly option to change traditional mortars by replacing cement with fly bottom ash (FBA) waste at 10, 20, 30, and 40 wt %. Likewise, leaves (ADL) were employed to reinforce the modified cement mortars at 0.4, 2, 5, and 7 wt %. X-ray diffraction analysis of used materials was performed. The morphology of composites made with FBA and ADL was investigated using scanning electron microscopy. Moreover, the density, water uptake, thermal conductivity, energy gain, and carbon dioxide (CO) emissions of the prepared composites were discussed. Their flexural strength, compressive strength, and displacement were also compared. Results revealed that the addition of FBA in the mortar matrix has a positive effect on decreasing the thermal conductivity and lightness of the mortar. In addition, 20 wt % of cement replacement by FBA guarantees simultaneously moderate mechanical properties, nearly 51% of energy gain, and 20% of total CO emission reduction. In the same, adding ADL to the 20wt %FBA mortar reduced the thermal conductivity and the lightness of the mortar. The 0.4 wt % ADL reinforcement ensured 59% energy gain and 6% of total CO emission reduction. A major amelioration was observed in the compressive strength (an increase of 14%) and in the plasticity (an increase of 27%) of the considered composite materials. In conclusion, using FBA as a cement replacement with low ADL content inclusion results in a thermal-resistant composite with reasonable durability and strength.
早期研究建议使用火山灰替代水泥，而其他研究则探讨了在水泥应用中使用植物源农业废弃物作为纤维增强材料的可能性。本研究提供了一种环保选择，即通过用10%、20%、30%和40%重量百分比的飞灰底灰（FBA）废料替代水泥来改变传统砂浆。同样，采用桉树叶（ADL）以0.4%、2%、5%和7%重量百分比增强改性水泥砂浆。对所用材料进行了X射线衍射分析。使用扫描电子显微镜研究了由FBA和ADL制成的复合材料的形态。此外，还讨论了制备的复合材料的密度、吸水率、热导率、能量增益和二氧化碳（CO）排放。还比较了它们的抗弯强度、抗压强度和位移。结果表明，在砂浆基体中添加FBA对降低砂浆的热导率和减轻重量有积极作用。此外，用FBA替代20%重量百分比的水泥可同时保证适度的机械性能、近51%的能量增益和20%的总CO排放减少。同样，向20%重量百分比FBA砂浆中添加ADL降低了砂浆的热导率和重量。0.4%重量百分比的ADL增强确保了59%的能量增益和6%的总CO排放减少。在所考虑的复合材料的抗压强度（提高14%）和可塑性（提高27%）方面观察到了显著改善。总之，使用FBA作为水泥替代品并包含低含量的ADL可得到具有合理耐久性和强度的耐热复合材料。
