Boosting Portland cement-free composite performance via alkali-activation and reinforcement with pre-treated functionalised wheat straw
Boosting Portland cement-free composite performance via alkali-activation and reinforcement with pre-treated functionalised wheat straw
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DOI：
10.1016/j.indcrop.2022.114648
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发表时间：
2022-02-09
影响因子：
5.9
通讯作者：
Stephan, Dietmar
中科院分区：
文献类型：
--
作者：
Chougan, Mehdi;Ghaffer, Seyed Hamidreza;Stephan, Dietmar
在建筑行业中使用麦秆增强的不含 OPC 的复合材料需要高效、环保的预处理以及表面功能化方法，将其转变为高性能材料。在此，使用碱活化材料（AAM）作为不含OPC的基质，同时采用环保的混合预处理和表面功能化来缓解麦秆的表面质量缺陷并提高其与低碳粘合剂的相容性。使用凹凸棒土纳米粘土和石墨烯纳米片对麦秆颗粒进行温和的物理预处理（先用热水，然后用蒸汽）并进行表面功能化，以提高其作为 AAM 中有效增强材料的能力。综合表征验证了预处理和表面功能化的成功，从而改善了麦秆和 AAM 之间的界面结合。使用经过凹凸棒石纳米粘土（即 H+S-AT）功能化的预处理秸秆增强的 AAM 样品获得了最佳结果，与对照样品相比，其渗透孔隙体积减少了 18%，而 90 d 的压缩和弯曲强度分别增加了 41% 和 27%。然而，对所得复合材料的热性能的影响并不显着。
Utilising wheat straw reinforced OPC-free composites in the construction industry requires efficient, eco-friendly pre-treatment coupled with surface functionalisation methods to turn it into a high-performance material. Herein, alkali-activated material (AAM) was used as an OPC-free matrix, while eco-friendly hybrid pre-treatment and surface functionalisations were applied to mitigate the surface quality deficiencies of wheat straw and improve its compatibility with low-carbon binders. Wheat straw particles were subjected to a mild physical pretreatment (hot-water followed by steam) and surface functionalisation using attapulgite nanoclay and graphene nanoplatelets to improve their capacity as an effective reinforcing material in AAM. Comprehensive characterisation verified successful pre-treatment and surface functionalisation, which led to the improved interfacial bond between wheat straw and AAM. The best results were obtained for the AAM samples reinforced with pretreated straw that was functionalised with attapulgite nanoclay (i.e., H+S-AT), in which the volume of permeable voids decreased by 18%, while compressive and flexural strength at 90 d increased by 41% and 27%, respectively, compared to the control sample. However, the effect on the thermal properties of the resulted composites was not significant.