Hydrophobic Calcium Carbonate for Cement Surface

Abstract

This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 • C there was no further increase. The maximum contact angle of 129 • was obtained at the temperature of 60 • C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO 3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13 C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties.

Preparation of low‐density polyethylene‐ and poly (lactide)/poly (butylene adipate‐co‐terephthalate)‐based antibacterial films integrated with elemental sulfur and sulfur nanoparticles

“…In LDPE‐based films, the two peaks at 2 θ = 22.1°, 2 θ = 24.4° were assigned to the (110) and (200) crystalline planes, respectively, and the broadband covering a range of 2 θ = 15–25° resulted from the amorphous phase of LDPE 40 . On the other hand, a peak at 2 θ = 29.5°corresponds to a calcite peak resulting from calcium stearate added for the compatibilizer 41,42 . The LDPE/ES film showed two weak diffraction peaks at 21.7°, 22.4° and a strong peak at 29.6° compared to the LDPE film, indicating that the component of the film changed from amorphous calcium carbonate to calcite form 43 …”

Novel bilayer electrospun poly(caprolactone)/ silk fibroin/ strontium carbonate fibrous nanocomposite membrane for guided bone regeneration

“…These results for S5, S6, and S7 were 69.48°, 74.69°, and 96.23°, respectively. The reason behind this phenomenon, which is decreasing in wettability through increasing in the SrCO 3 content, can be attributed to both the carbon of SrCO 3 and agglomeration 38–40 …”

Effect of composition CaCO3/polyurethane (PU) on contact angle of the surface and compressive strength of mortar

“…The manufacture of a hydrophobic layer on cement has been carried out by Wang et al, by varying the PDMS and resulting in an optimum contact angle of 157.3° at a variation of 1.2% of the cement weight [10]. In addition, Atla et al also conducted research on the manufacture of a hydrophobic layer of calcium carbonate by varying the temperature and obtaining the optimum contact angle at 60°C [11].…”