Synthesis and microstructural analysis of calcined double hydroxide material and its performance for alkaline-decline resistance in concrete pores and chloride adsorption from simulated concrete pore solution

Abstract Calcined Mg/Al double hydroxide material (CDH) was prepared and investigated to stabilize the pH on the simulated concrete pore solution (SCPS) in addition to adsorb chlorides from the SCPS. The synthesized CDH material was investigated in terms of FESEM, XRD, and XPS techniques. The effect of CDH on the pH of SCPS was studied and the pH was successfully stabilized. The as-prepared CDH demonstrated improved Cl- adsorption in SCPS with maximum Cl- uptake capacity at 67.66 mg/g using 20 mmol/l as initial concentration. Additionally, the impedance analysis indicates the successful adsorption of chloride over the CDH electrode.