Improvement in the freeze-thaw resistance performance of concretes by a composite phase change material
Source abstract
Abstract
Concrete is a widely used material for buildings, and its production reached approximately 10 billion m 3 in 2022. Half of concrete-related buildings suffer seasonal freeze-thaw action, which causes frequent engineering damage, short service life and enormous economic loss. To improve the freeze-thaw resistance and durability of concretes, we used expanded graphite (EGC 14 ) to encapsulate n-tetradecane (C 14 ) and thus prepared a composite phase change material (EGC 14 ). Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) tests indicate that the EGC 14 is chemically stable and has excellent phase change capability. Then, five mass ratios of the EGC 14 to concrete aggregates were designed to produce phase change concretes (PCCs), named as PCC-EGC 14 s (0%, 1%, 2%, 3%, and 4%). The PCC-EGC 14 s′ freeze-thaw resistance performances were systematically tested at different freeze-thaw cycles (FTCs). The test data demonstrate that the EGC 14 could effectively keep the transition and capillary pores in the PCC-EGC 14 s from expanding into easily FTC-damaged macropores. Moreover, the more EGC 14 the PCC-EGC 14 s contain, the less mass loss, and the larger dynamic moduli of elasticity (MOE d ) and compressive strengths the PCC-EGC 14 s have. According to the strength requirement of C20 concretes, the PCC-EGC 14 (3%) has the optimal freeze-thaw durability. Therefore, it is suggested for actual engineering applications. Of course, the mix design principle and experimental data of the new PCC-EGC 14 s in this work are helpful to comprehend the freeze-thaw process and mechanism of concretes and could also provide a critical reference for practical production. • A new composite phase change concrete (PCC- EGC 14 ) was developed and experimentally investigated. • The PCC- EGC 14 s all have good freeze-thaw resistance performance compared with ordinary concretes. • The optimal mixing ratio of the PCC- EGC 14 was selected out.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Phase Change Materials Research · Concrete and Cement Materials Research · Concrete Properties and Behavior
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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