Altimari Fabiana, Andreola Fernanda, Lancellotti Isabella, Cobo-Ceacero Carlos Javier, Cotes-Palomino Teresa, Martínez-García Carmen, López-García Ana Belen, Barbieri Luisa
Department of Engineering "Enzo Ferrari", University of Modena and Reggio Emilia, via Vivarelli, 10, 41125 Modena, Italy.
CRICT-Inter-Departmental Research and Innovation Center on Constructions and Environmental Services, 41125 Modena, Italy.
Materials (Basel). 2025 Aug 6;18(15):3692. doi: 10.3390/ma18153692.
In this work, lightweight aggregates (LWAs) were prepared from an Italian red clay, pumice scraps, and spent coffee grounds. Chemical and physical characterization was first performed on the raw materials and then on the finished products. By studying the thermal behavior of the materials, the correct firing temperature was evaluated. The obtained aggregates were fired in two different modes: in a rotary kiln and in a static kiln; the influence of the firing processes on the finished products was assessed. This study can be useful for industrially scaling up this process. Firing in a rotary kiln reduced the average diameter of the aggregates (negative expansion index), resulting in a higher compressive strength and dry particle density compared to an aggregate containing only clay. The pH and electrical conductivity values address their use in agronomy without causing problems to crops, while the higher compressive strength, density, and porosity values could allow their use in construction.
在这项工作中，轻质骨料（LWAs）由意大利红粘土、浮石废料和咖啡渣制备而成。首先对原材料进行化学和物理表征，然后对成品进行表征。通过研究材料的热行为，评估了正确的烧制温度。所获得的骨料以两种不同方式烧制：在回转窑和静态窑中；评估了烧制过程对成品的影响。该研究对于在工业上扩大这一工艺规模可能是有用的。与仅含粘土的骨料相比，在回转窑中烧制降低了骨料的平均直径（负膨胀指数），从而产生了更高的抗压强度和干颗粒密度。pH值和电导率值表明它们在农学中的使用不会给作物带来问题，而较高的抗压强度、密度和孔隙率值使其可用于建筑。
