Payá Jordi, Escalera Alejandro, Borrachero María Victoria, Roselló Josefa, Monzó José, Soriano Lourdes
ICITECH-Institute of Concrete Science and Technology, Universitat Politècnica de València, Av. dels Tarongers, 4N, 46022 València, Spain.
Department of Agroforestry Ecosystems, Universitat Politècnica de València (UPV), 46022 València, Spain.
Materials (Basel). 2024 Sep 4;17(17):4374. doi: 10.3390/ma17174374.
Agricultural waste availability implies the possibility of recovering energy as biomass. The collateral effect is the production of ashes that, in some cases, have the potential to be reused in the manufacture of cement, mortar, and concrete. This article presents the study of the auto-combustion (unlike all previous studies) of corn (maize) straw (stems and leaves). The auto-combustion temperature was monitored, and the obtained corn straw ash (CSA) was characterized by means of X-ray fluorescence, X-ray diffraction, thermogravimetry, and scanning electron microscopy. Finally, the behavior of ground CSA was analyzed in both the fresh state by measurement of workability on the spreading table and the hardened state by compressive strength measurement on mortars in which 10% of ordinary Portland cement (OPC) was replaced with CSA. These values were compared to both a control mortar (OPC) and a mortar in which OPC was partially replaced with 10% limestone filler. Ashes showed adequate pozzolanic reactivity because, at 90 curing days, the compressive strength of the mortars with 10% replacement of OPC with CSA was practically equal (98% of the strength) to the control mortar without pozzolan replacement. The auto-combustion of biomass is a process that can be easily available, and the results on pozzolanic reactivity of CSA are satisfactory. The auto-combustion could be used by low-income communities to reduce Portland cement clinker use and to recover waste.
农业废弃物的可得性意味着有可能将生物质作为能源回收利用。附带效应是产生灰烬，在某些情况下，这些灰烬有可能被重新用于水泥、砂浆和混凝土的制造。本文介绍了对玉米（茎和叶）秸秆进行自动燃烧（与之前所有研究不同）的研究。监测了自动燃烧温度，并通过X射线荧光、X射线衍射、热重分析和扫描电子显微镜对获得的玉米秸秆灰（CSA）进行了表征。最后，通过在扩展台上测量工作性分析了磨细CSA在新鲜状态下的性能，并通过在以10%的CSA替代普通硅酸盐水泥（OPC）的砂浆中测量抗压强度分析了其在硬化状态下的性能。将这些值与对照砂浆（OPC）以及用10%石灰石填料部分替代OPC的砂浆进行了比较。灰烬表现出足够的火山灰活性，因为在养护90天时，用10%的CSA替代OPC的砂浆的抗压强度实际上与未用火山灰替代的对照砂浆相等（强度的98%）。生物质的自动燃烧是一个易于实现的过程，并且CSA的火山灰活性结果令人满意。自动燃烧可被低收入社区用于减少波特兰水泥熟料的使用并回收废弃物。
