This paper presents the results of studying properties cement-based composites modified with a complex additive based on chrysotile nanofibers and carbon black. The optimal composition was stated due to particle size analysis suspensions different black ratios mechanical study fine-grained concrete additive. It found that addition in amount 0.05% cement mass together 0.01% leads 31.9% compressi...

The aim of this study was to evaluate the influence of a calcium silicate-based sealer (iRoot SP), with or without a core material, on bond strength to radicular dentin, in comparison with various contemporary root filling systems. Root canals of freshly extracted single-rooted teeth (n = 60) were instrumented using rotary instruments. The roots were randomly assigned to one of the following ex...

We study the elastic behavior and rupture mechanism of Calcium Silicate Hydrates (C-S-H) in response to tensile loading. For three axes, initial defects are spotted interlayer regions. However, crack propagation is rather different depending on axis tensile. The cup-and-cone failure surface shows ductile feature C-S-H x y directions; while devastating mode confirms brittle z direction. Piezoele...

This study aims to investigate the effect of two periods burning conditions on chemical properties rice husk ash (RHA). Gray correlation theory analysis combined with a scanning electron microscope was used precisely analyze impact RHA particle sizes mechanical and microstructure mortar. The experimental results reveal that prolonging residence time at 600 ºC could significantly reduce carbon c...

This work is intended to provide a better understanding about the properties and roles of the reaction rim in an alkali-silica reaction. A simplified calcium-alkali-silicate system was created to simulate the multiple interactions among reactive silica, alkaline solution and portlandite near the aggregate surface during the formation and evolution of the reaction rim in an alkali-silica reactio...

Hydrothermal formation reaction of tobermorite in the autoclaved aerated concrete (AAC) process has been investigated by in-situ X-ray diffraction. High-energy X-rays from a synchrotron radiation source in combination with a newly developed autoclave cell and a photon-counting pixel array detector were used. XRD measurements were conducted in a temperature range of 100–190 °C throughout 12 h of...