To investigate the effect of water-to-binder ratio and fly ash content on properties bendable concrete, we prepared four samples different strength grades with ratios 0.25 0.30 contents 60% 80%. The effects compressive strength, flexural elastic modulus, fracture toughness, uniaxial tensile deformation were investigated. results show that concrete can be varied by varying content. Water-to-bind...

In order to improve the mechanical properties of B4C ceramics, B4C@TiB2 composite powders with core-shell structure are prepared by molten salt method using and Ti as raw materials. And ceramics were from spark plasma sintering (SPS). The results show that exhibit intact structure. improves mass transfer during sintering. When molar ratio B4C/Ti is 2/1, relative density, Vickers hardness, fract...

the use of methods employed for estimating the strength and toughness of composites reduces the trial-and-error in their design. the strength of interface between reinforcement and matrix and the effective surface of pulled-out particles have great influences on toughness and strength of these composites. in this study, a model was proposed to estimate the interface strength and matrix strength...

BACKGROUND It is unclear whether eczema prevalence is truly increasing worldwide. OBJECTIVE We sought to investigate worldwide secular trends in childhood eczema. METHODS Children (n = 302,159) aged 13 to 14 years in 105 centers from 55 countries and children aged 6 to 7 years (n = 187,943) in 64 centers from 35 countries were surveyed from the same study centers taking part in Phase One an...

assessment of the correlation between rock brittleness and rock fracture toughness has been the subject of extensive research works in the recent years. unfortunately, the brittleness measurement methods have not yet been standardized, and rock fracture toughness cannot be estimated satisfactorily by the proposed indices. in the present study, statistical analyses are performed on some data col...

Fiber-reinforced concrete (FRC) has good toughness and a gentle stress–strain softening section, which can improve the inherent defects of material such as high brittleness, easy cracking, poor fracture toughness. In this paper, carbon fiber, aramid fiber mixed are introduced to enhance performance precast prestressed beams (PPCB). The effects different types adding rate on mechanical propertie...

background: flexural strength of prosthesis made with dental composite resin materials plays an important role in their survival. the aim of this study was investigating the effect of nanoclay fillers and poly (methyl methacrylate)-grafted (pmma-grafted) nanoclay fillers loading on the flexural strength of fiber-reinforced composites (frcs). materials and methods: standard frc bars (2 × 2 × 25 ...

Ceramsite concrete is increasingly used for structural applications due to its lightweight, high-strength, and high-temperature resistance advantages. However, research into the postcreep properties of ceramsite has yet keep pace with other areas. Therefore, this paper aims investigate flexural bearing beams after creep make recommendations future research. To study load-bearing performance cre...

Due to the harsh climatic conditions in high altitude and cold regions with large temperature differences, asphalt pavement is generally prone cracking, cracks propagate rapidly, which reduces service life level of road. The factors influencing fracture characteristics mixtures were analyzed this paper, different aggregate gradations from various types prepared. explored using thermal stress re...