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Structural observation of cement paste modified with hydrophobic organoclay
Highlights Hydrophobic organoclays (OC) of different d001 used for cement substitution. OC possessing aromatic substitute group increases mechanical strength of cement formulation. OC of the higher d001 improves the resistance of cement composition to water absorption. QSDFT method used for pore and pore neck size distribution analysis.
Abstract This study investigates the impact of different hydrophobic organically modified clay (OC), grouped according d001 and functional group of modifier, on hydration, microstructure, mechanical and water absorption properties of cement formulations. SEM, TGA, XRD and N2 sorption techniques employed for microstructural characterization. Pore and pore neck size distribution of cementitious materials was derived from QSDFT method applied on sorption isotherms. Results revealed that in OC-cement formulations the volume and the width of small capillary pores varies depending on the modifier type and d001 of OC, meanwhile the distribution of pore neck size is almost the same for all compositions. According to results, cement compositions with the addition of OC possessing aromatic substitute group and of larger d001 showed higher mechanical strength and substantially lower sorptivity.
Structural observation of cement paste modified with hydrophobic organoclay
Highlights Hydrophobic organoclays (OC) of different d001 used for cement substitution. OC possessing aromatic substitute group increases mechanical strength of cement formulation. OC of the higher d001 improves the resistance of cement composition to water absorption. QSDFT method used for pore and pore neck size distribution analysis.
Abstract This study investigates the impact of different hydrophobic organically modified clay (OC), grouped according d001 and functional group of modifier, on hydration, microstructure, mechanical and water absorption properties of cement formulations. SEM, TGA, XRD and N2 sorption techniques employed for microstructural characterization. Pore and pore neck size distribution of cementitious materials was derived from QSDFT method applied on sorption isotherms. Results revealed that in OC-cement formulations the volume and the width of small capillary pores varies depending on the modifier type and d001 of OC, meanwhile the distribution of pore neck size is almost the same for all compositions. According to results, cement compositions with the addition of OC possessing aromatic substitute group and of larger d001 showed higher mechanical strength and substantially lower sorptivity.
Structural observation of cement paste modified with hydrophobic organoclay
Kalpokaitė-Dičkuvienė, Regina (author) / Lukošiūtė, Stasė Irena (author) / Baltušnikas, Arūnas (author) / Čėsnienė, Jūratė (author)
2020-12-05
Article (Journal)
Electronic Resource
English
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