Bonifacio Alysson Larsen, Archbold Paul
Sustainable Infrastructure Research Group, Technological University of the Shannon, Midlands Midwest, N37HD68 Athlone, Ireland.
Materials (Basel). 2024 May 28;17(11):2588. doi: 10.3390/ma17112588.
The viability of incorporating agricultural by-products, such as oat husks, not yet explored in limestone-based composites, as more sustainable alternatives for use as novel aggregates may be improved through the adoption of well-known valorisation strategies applied to other plant-based resources. In this context, this work innovates by assessing how treatments on oat husk surfaces and the choice of limestone-based binders impact the mechanical performance of composites. The strategy adopted to achieve these objectives, in addition to carrying out the physical and geometric characterisation of the husks, consists of treating the husks' surface using washing cycles in water, cement/pozzolan binder, and linseed oil. Furthermore, matrices combining cement, calcium hydroxide Ca(OH), and microsilica (SiO) were used. In conclusion, even though the effects of different binder combinations are inconsistent, coating oat husks-especially with linseed oil-works well in delaying particle degradation and improving mechanical strength compared to untreated particles. Furthermore, when aggregates are substituted with the longer and lamellar particles of oat husk, the impact of the water/cement ratio on mechanical performance and composite workability significantly decreases.
将农业副产品（如燕麦壳）用作新型骨料的更可持续替代品，这一可行性在基于石灰石的复合材料中尚未得到探索。通过采用应用于其他植物基资源的著名增值策略，或许可以提高其可行性。在此背景下，本研究通过评估燕麦壳表面处理以及基于石灰石的粘结剂选择如何影响复合材料的机械性能进行创新。为实现这些目标所采用的策略，除了对燕麦壳进行物理和几何表征外，还包括用水洗循环、水泥/火山灰粘结剂和亚麻籽油处理燕麦壳表面。此外，还使用了结合水泥、氢氧化钙Ca(OH)和微硅粉(SiO)的基体。总之，尽管不同粘结剂组合的效果不一致，但与未处理的颗粒相比，用亚麻籽油等涂覆燕麦壳在延缓颗粒降解和提高机械强度方面效果良好。此外，当用较长的片状燕麦壳颗粒替代骨料时，水灰比对机械性能和复合材料工作性的影响会显著降低。
