Plant concretes were developed and are currently used as filling material in a timber frame. Their properties are strongly related to the bio-aggregates characteristics. In addition, since hemp shiv, the reference bio-based aggregate, has a limited availability, it is necessary to consider alternative bio-aggregates largely and locally available. Thus, this paper focused on identifying and understanding mechanisms of interaction between different bio-aggregates and mineral binders. To address this issue, the first objective was to determine the properties of five hemp shives and two alternative bioaggregates for vegetal lightweight concrete: corn and sunflower bark particles. The study of the chemical interactions between bio-aggregates and a pozzolanic binder was conducted on model pastes mixed with filtered solutions containing bio-aggregates extractives. The mechanical properties of the paste, as well as their hydration and their mineralogical evolution were studied. In the last part, the mechanical behavior of vegetal concretes was assessed. The results highlight a strong relation between the mechanical behavior of pastes and concretes and the extractive content of the different tested bio-aggregates. Finally, pastes appeared as a relatively good model to predict the behavior of concretes by following their early age performances: setting delay and 3-day mechanical strength.

中文翻译：

---

生物集料特性对与矿物粘合剂化学相互作用的影响，在植物混凝土中的应用

植物混凝土被开发出来，目前用作木框架中的填充材料。它们的特性与生物聚集体的特性密切相关。此外，由于参考生物基骨料大麻 shiv 的可用性有限，因此有必要考虑在当地大量使用替代生物骨料。因此，本文侧重于识别和理解不同生物聚集体和矿物粘合剂之间相互作用的机制。为了解决这个问题，第一个目标是确定五种大麻碎屑和两种用于植物轻质混凝土的替代生物聚集体的特性：玉米和向日葵树皮颗粒。对与含有生物聚集体提取物的过滤溶液混合的模型糊剂进行了生物聚集体和火山灰粘合剂之间化学相互作用的研究。研究了糊状物的机械性能，以及它们的水合作用和它们的矿物学演变。最后，对植物混凝土的力学性能进行了评估。结果强调了糊状物和混凝土的机械性能与不同测试生物集料的提取物含量之间的密切关系。最后，通过跟踪混凝土的早期性能：凝结延迟和 3 天机械强度，糊状物作为一种相对较好的模型来预测混凝土的行为。评估了植物混凝土的力学性能。结果强调了糊状物和混凝土的机械性能与不同测试生物集料的提取物含量之间的密切关系。最后，通过跟踪混凝土的早期性能：凝结延迟和 3 天机械强度，糊状物作为一种相对较好的模型来预测混凝土的行为。评估了植物混凝土的力学性能。结果强调了糊状物和混凝土的机械性能与不同测试生物集料的提取物含量之间的密切关系。最后，通过跟踪混凝土的早期性能：凝结延迟和 3 天机械强度，糊状物作为一种相对较好的模型来预测混凝土的行为。