Performance Evolution and Degradation Mechanism of Chemically Bonded Phosphate Ceramic Cement Under Freeze–Thaw Cycles
Year: 2025
Type: article
Abstract: This study investigates the performance variations in chemically bonded phosphate ceramic (CBPC) cement under different media (water and 3% NaCl solution) environments subjected to varying numbers of freeze–thaw cycles, including changes in compressive strength, mass loss rate, phase composition, microstructure, external pH, and ion concentration, with the aim of elucidating its long-term durability degradation mechanisms and microstructural evolution. The results show that both the mass and compressive strength of CBPC cement first increase and then decrease with increasing freeze–thaw cycles. After 400 cycles, the compressive strength decreases by 29.91% in water and 25.16% in salt solution. The pH value rises with cycling, along with increased concentrations of K+, Mg2+, and PO43−, while Na+ and Cl− concentrations decrease in salt solution. XRD/Rietveld analysis reveals that the content of MgKPO4·6H2O decreases from 28.1% to 19.5% (water) and 20.7% (salt), with a gradual reduction in crystallinity. TG/DTG and FTIR results confirm these findings, showing extensive microcracking in hydration products, which aligns with the observed macro-performance changes.
Source: Materials
DOI: 10.3390/ma18235298
Authors: Bo Pang, Runqing Liu, Yuanquan Yang, Yunpeng Cui
Institutions: Liuzhou Institute of Technology, Shenyang Ligong University
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
OpenAlex ID: W4416730409