Nanomgo

The precursors d(+)-glucose (C₆H₁₂O₆, 99%) and sulfur (S, 99.9%) for catalyst preparation were purchased from Macklin. NaOH (AR, 96%), tetracycline (TC, CP), l-histidine (C₆H₉N₃O₂, 99%) and potassium persulfate (K₂S₂O₈, 99.5%) were obtained from Aladdin. Hydrochloric acid (HCl, AR) and methanol (MeOH, 99.7%) were obtained from Xilong Scientific Co., Ltd 20 nm nanoMgO was obtained from Xianfeng Nanomaterials Technology Co., Ltd 50 nm nanoMgO was obtained from Macklin. All chemicals were used as received. All solutions were prepared with ultrapure water.

The recycled aggregate used in this test was collected from a construction site in Erhuan North Road, Shaoxing City, Zhejiang Province, China. After removing the asphalt layer on the abandoned road subgrade, the aggregate at the bottom of the subgrade was crushed and screened to obtain recycled fine aggregate with a particle size of less than 4.75 mm. Laboratory geotechnical tests of recycled fine aggregates were carried out according to “Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering” (JTG E51-2009) [19 ], and their basic physical properties were measured as shown in Table 1, which was obtained from the research of Lv et al. [20 (link)]. The main chemical components of recycled fine aggregate are SiO₂ and CaCO₃. The cement used in the test was PO32.5 ordinary Portland cement, and the basic physical properties are shown in Table 2, which was sourced from the research of Lv et al. [21 (link)]. The nano-MgO used in the test was produced by Shanghai Macklin Biochemical Co., Ltd. (Shanghai, China), model M813080, and was obtained in the form of white powder. The specific physical parameters are shown in Table 3, which is from the research of Wang et al. [22 (link)]. In order to meet the actual application of the project, the test water is ordinary laboratory tap water composed of water and some ions, such as calcium, magnesium, and potassium.