Abstract Many species of seabird ingest or are provisioned with pumice stones, buoyant volcanic rocks that thought to aide in digestion, occasionally during times poor prey availability. Unlike other indigestible matter, like plastics, the effect on chick growth, its relationship ingested and variation among years has not yet been examined. We analysed amount from 739 Flesh-footed ( Ardenna car...

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 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...

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...

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 ...

AIM & OBJECTIVES The purpose of this in vitro study was to evaluate and compare the microleakage of pit and fissure sealants after using six different preparation techniques: (a) brush, (b) pumice slurry application, (c) bur, (d) air polishing, (e) air abrasion, and (f) longer etching time. MATERIAL & METHOD The study was conducted on 60 caries-free first premolars extracted for orthodontic p...