Abstract The present paper presents a multiscale and multiphysics study that focuses on the development of an innovative composite material, which combines a cementitious matrix modified by a phase-change material (PCM) with textile reinforcement (PCM-TRC). The development of this composite has been guided by the conjunction of several factors, among which it is appropriate to emphasise the lightweight of the composite due to the reduced covers in textile reinforced concrete (TRC) coupled to the high thermal inertia due to the addition of PCM microcapsules. This research focuses on the effect of PCM on the mechanical and physicochemical properties of TRC. Special emphasis is placed on providing the phenomenological explanation for the resulting mechanical behaviour of TRC according to the rate and state of the PCM. It has been found that the ductile mechanical behaviour of TRC composites is maintained in the presence of microencapsulated PCM; however, the mechanical performance of PCM-TRC decreases with the PCM rate. This is due to the disorder caused by PCM at the matrix and interface scales. Furthermore, it has been found that the PCM state (solid or liquid) can affect the mechanical performance of both the PCM–mortar matrix and PCM-TRC composite. This is due to PCM expansion during phase change from the solid to the liquid state, which can induce matrix microcracking.

中文翻译：

---

一种新的 PCM-TRC 复合材料：机械和物理化学研究

摘要 本文提出了一项多尺度和多物理场研究，重点是开发一种创新的复合材料，该材料将相变材料 (PCM) 改性的水泥基体与织物增强材料 (PCM-TRC) 相结合。这种复合材料的开发受到了几个因素的综合指导，其中，由于织物增强混凝土 (TRC) 的覆盖层减少，加上由于添加了高热惯性，因此应该强调复合材料的轻量化PCM 微胶囊。本研究侧重于 PCM 对 TRC 机械和物理化学性能的影响。特别强调根据 PCM 的速率和状态为 TRC 的最终机械行为提供现象学解释。已经发现，在微囊化 PCM 的存在下，TRC 复合材料的延展性机械性能得以保持；然而，PCM-TRC 的机械性能随着 PCM 速率的增加而降低。这是由于 PCM 在矩阵和界面尺度上造成的混乱。此外，已经发现 PCM 状态（固体或液体）会影响 PCM-砂浆基质和 PCM-TRC 复合材料的机械性能。这是由于在从固态到液态的相变过程中 PCM 膨胀，这会导致基体微裂纹。已经发现 PCM 状态（固体或液体）会影响 PCM-砂浆基质和 PCM-TRC 复合材料的机械性能。这是由于在从固态到液态的相变过程中 PCM 膨胀，这会导致基体微裂纹。已经发现 PCM 状态（固体或液体）会影响 PCM-砂浆基质和 PCM-TRC 复合材料的机械性能。这是由于在从固态到液态的相变过程中 PCM 膨胀，这会导致基体微裂纹。