Effects of layered double hydroxides incorporation on carbonation resistance of cementitious materials
2018
Abstract The development of new or modified cementitious materials is an important part of existing strategies to improve performance and minimize life-cycle costs and to eliminate the CO 2 's impact on durability. The high anion exchange capacity of layered double hydroxides (LDHs) materials makes their interlayer ion exchange by organic and inorganic anions versatile and easily achieved. LDH-like materials could be used in cementitious materials for their CO 3 2− capturing capacity and to enhance carbonation resistance of cementitious materials. In this work, original LDHs were synthesized, LDHs calcined at 500, 550 and 600 °C, respectively, were prepared. Power X-ray diffraction (XRD), IR-spectroscopy and thermal analysis (TG–DSC) were employed to characterize the component and structural changes of these types of LDHs before and after CO 2 capture. Carbonation resistance of cement paste incorporating LDHs was experimentally evaluated for assessment of CO 2 capture capacity of LDHs. Ion exchange mechanism of LDHs was also analyzed from adsorption experiments. The results show that LDH-like materials could be used for their CO 3 2− capturing capacity to enhance carbonation resistance of concrete as well as to eliminate CO 2 's impact on durability aspect especially the LDHs calcined at 600 °C. Calcined LDHs fulfill the structure regeneration after CO 2 capture. LDHs have positive effect on improvement of carbonation resistance of cement paste especially at later curing stages.
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