The Damage Evolution and Microstructure Characteristics of Partial Immersion Recycled Aggregate Concrete Subjected to Compound Salt
WANG Jiabin1,2,3,*, CHE Zhihao1,3, HOU Zeyu1, FAN Yijie1,3, NIU Ditao2
1 Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China 2 State Key Laboratory of Green Building in Western China (XAUAT), Xi’an 710055, China 3 Xi’an Key Laboratory of Civil Engineering Testing and Destruction Analysis on Military-Civil Dual Use Technology (XATU), Xi’an 710021, China
Abstract: Aim to investigate the microstructure characteristics and damage evolution of recycled aggregate concrete (RAC) construction members which were partially buried in soil and partially exposed air, the partial immersion experiment was developed as the compound salt solution of 7.5%MgSO4, 7.5%Na2SO4, and 5%NaCl (mass ratio), to simulate the service environment of the soil and underground water in Northwest China. The durability degradation law of partial immersion RAC was studied by testing the visual appearance, mass, and relative dynamic elastic modulus (RDEM). After that, the microstructure characteristics of RAC exposed to the compound salt solution were analyzed based on the mineral composition and its relative weight using XRD, FTIR, and TG methods. Moreover, SEM and EDS revealed the damaged mechanism for observation of the microstructure and the element compositions of the interesting zone. Results showed that the RDEM changed along the RAC specimen’s height. The varying of the RDEM of the testing area range of 3—6 was relatively stable. Afterward, the values decreased to the lowest at the testing area range of 7—8 and then rose to 100% rapidly at the testing area range of 11—12. The four exposure regions, namely, capillary saturation zone, liquid-gas two-phase interface zone, moisture transport zone, and dry zone, were distributed from bottom to up for the partial-immersion RAC. With an increase in the immersion day, the corrosion mechanism of the capillary saturation zone changed from chemical attack to chemical attack with physical damage. The damage faction of liquid-gas two-phase interface zone became from chemical attack-physical damage to chemical attack with physical damage. The moisture transport zone’s damage mode was specially transited from non-damaged to chemical attack-physical damage.
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2024, Vol. 38 
