Understanding the compressive strength degradation mechanism of cement-paste incorporating phase change material
Document Type
Article
Publication Date
11-1-2021
Abstract
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 mPCMpastes. 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.
Keywords
Mixing, Phase change material, Leakage, Compressive strength, Hydration, Porosity
Divisions
sch_civ
Funders
Hunan University, China Hunan Provincial Science and Technology Department "Program for Innovative Talents of Excellent Postdoctoral Fellow" [2020RC2031 ],National Natural Science Foundation of China (NSFC)
Publication Title
Cement & Concrete Composites
Volume
124
Publisher
Elsevier Sci Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND