abstract: The microstructure of cement pastes is important to understand the effect some parameters in hydration process. In this context, study had as objective evaluate different water/binder (w/b) ratios process cementitious produced with and without incorporation silica fume metakaolin. were obtained 0.3, 0.4 e 0.5, replacement, by weight, Portland for metakaolin, contents 10% 20%, respecti...

The study is focused on ultra-light foam concrete (FC) aimed as a thermal insulation material. Two important properties of such material were investigated: compressive strength and conductivity. In the conducted tests, influence air-dry density (200–500 kg/m3), type foaming agent (synthetic protein) binder (ordinary Portland cement—OPC; calcium sulphoaluminate cement—CSA; metakaolin; siliceous ...

This study explores the effects of interactions among Na 2 O content, metakaolin content and activator modulus on compressive strength autogenous shrinkage alkali-activated slag–metakaolin (AASM) materials. The Box–Behnken RSM design was used to create an experimental scheme, establish a model, optimize mix proportions. Fourier transform infrared spectroscopy, scanning electron microscopy, Merc...

This paper analyzed the activity of coal-based metakaolin and non-coal-based (ordinary metakaolin) commonly used in Chinese market. The content kaolin was detected by XPF. phases kaolin, corresponding alkali-excited reactants were XRD. contents Al (IV), (V) (VI) 27Al NMR. micromorphology observed SEM. water-resistance alkali-activated tested immersion experiment. results showed that a lot corun...

New self-healing agents that can chemically bind seawater ions invading cracked cementitious materials were proposed. The potential of and binding investigated by thermodynamic modeling. It was found CaO-NaAlO2 CaO-metakaolin have Cl−, SO42− Mg2+ bound reacting with sea water to form Friedel's salt, Kuzel's ettringite hydrotalcite. removal Cl− from firstly increased then decreased the increase ...

In this study the development of a metakaolin based geopolymeric mortar to be used as bonding matrix for external strengthening of reinforced concrete beams is reported. Four geopolymer formulations have been obtained by varying the composition of the activating solution in terms of SiO₂/Na₂O ratio. The obtained samples have been characterized from a structural, microstructural and mechanical p...

In order to study the effect of metakaolin on water resistance magnesium phosphate cement mortar, we took four factors as research objects: setting time, fluidity, compressive strength, and mortar. These were studied after adding equal gradations metakaolin, then carried out SEM microcosmic experiments best group. The results showed that with increase in content, time decreased gradually, fluid...

Abstract Kaolin samples were collected to study the mineralogical, texture, chemical composition, thermal behavior, and treatment also possibility convert kaolinite mineral into metakaolin use it as a natural pozzolanic and/or geopolymer materials. Kaolinite is main constituent of clay mineral, which related many weathering parent rocks complete leaching alkali elements under warm, humid semi-a...