Durability Degradation Laws and Mechanism of Recycled Aggregate Concrete Subjected to Mg2+-SO42--Cl- by Full Immersion
WANG Jiabin1,*, ZHANG Kaifeng2, ZHENG Kanghua1, FU Mengtao1
1 College of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China 2 China West Construction North Co., Ltd., Xi’an 710065, China
Abstract: The soil and groundwater in Northwest China contain high concentrations of aggressive ions such as magnesium, sulfate, and chloride, which lead to serious degradation of the durability of recycled aggregate concrete (RAC) structures buried underground. In order to reveal the durability’s regularity and mechanism, the experiment of RAC with supplementary cementitious materials (SCMs) immersed in Mg2+-SO42--Cl- solution was carried out. The influence of the collocation and replacement ratio about the SCMs on the durability degradation laws of RAC was studied. Afterwards, the mineral composition and its relative content were characterized by X-ray diffraction, infrared spectroscopy, and thermogravimetry methods. The results show that the RAC with 10% fly ash+20% slag had better durability, while the RAC with more than 10% silica fume or 10% metakaolin had worse durability. Aggressive ions reacted with hydration products to form corrosion products with large grain sizes, which accelerated C-S-H transforming to M-S-H. Otherwise, crystalline salt was formed under the interaction between aggressive ions and original ions in pore solution, promoting the initiation and expansion of cracks. The combined action of chemical corrosion and physical damage destroyed the microstructure and accelerated aggressive ions diffusion, leading to chemical corrosion-microstructure damage-ions transportation. Micro-cracks and capillary pores were appeared in the interface transform zones and mortars, resulting seriously degradation of RAC’s physical and mechanical properties.
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2024, Vol. 38 
