This study aims to elucidate the effect of different mixing speeds on microencapsulated phase change material (mPCM) and examine the associated degradation mechanism of compressive strength of cement-paste. Experimental results showed that moderate to high mixing speed led to the damage of mPCM particles and consequently the PCM leakage. The PCM leakage was evidenced by changes in the rheological properties of the mPCM-pastes. The early age compressive strength seemed to be more sensitive to the PCM leakage than the 28-day compressive strength. The XRD results showed no evidence of any chemical change in the mPCM-paste associated with this leakage. Therefore, the lowered compressive strength in mPCM-paste was mainly ascribed to the decrease in the heat of hydration along with a significant increase in porosity and coarsening of pore structure.

本研究旨在阐明不同混合速度对微囊化相变材料 (mPCM) 的影响，并研究水泥浆抗压强度的相关降解机制。实验结果表明，中到高的混合速度会导致 mPCM 颗粒损坏，从而导致 PCM 泄漏。mPCM 糊状物的流变特性的变化证明了 PCM 泄漏。早期抗压强度似乎比 28 天抗压强度对 PCM 泄漏更敏感。XRD 结果显示没有证据表明 mPCM 糊状物中与此泄漏相关的任何化学变化。因此，mPCM-糊状物的抗压强度降低主要归因于水化热的降低以及孔隙率的显着增加和孔结构的粗化。