This paper presents an experimental study on circular stirrup-confined concrete specimens under uniaxial and monotonic load. The effects of stirrup volume ratio, stirrup yield strength and concrete strength on damage evolution of stirrup-confined concrete were investigated. The experimental results showed that the strength and ductility of concrete are improved by appropriate arrangement of the...

Reutilizing industrial by-products and recycled concrete aggregates (RCA) to replace cement natural (NA) in is becoming increasingly important for sustainable development. Yet, experimental evidence needed prior the widespread use of this by construction industry. This study examines performance alkali-activated slag made with RCA reinforced steel fibers. Natural coarse were replaced RCA. Steel...

BACKGROUND Taphonomic study of marine vertebrate remains has traditionally focused on single skeletons, lagerstätten, or bonebed genesis with few attempts to document environmental gradients in preservation. As such, establishment of a concrete taphonomic model for shallow marine vertebrate assemblages is lacking. The Neogene Purisima Formation of Northern California, a richly fossiliferous uni...

OBJECTIVES This study evaluated the influence of air-particle abrasion protocols on the surface roughness (SR) of zirconia and the shear bond strength (SBS) of dual-polymerized resin cement to this ceramic. MATERIALS AND METHODS Sintered zirconia blocks (n = 115) (Lava, 3M ESPE) were embedded in acrylic resin and polished. The specimens were divided according to the 'particle type' (Al: 110 µ...

In recent years, with the rapid development of coal-mining industry, output gangue has increased at a faster pace, while its utilization remains relatively low. The accumulation large amount brought about environmental problem. order to improve rate waste gangue, and solve secondary problems caused by pollution, this paper conducted research on an economic environmentally friendly gangue-based ...

BACKGROUND Air-abrasion can be used for enamel preparation before fissure sealing as well as acid etching which is the evidence-based method for enamel preparation before sealing. AIM The aim of this study is to evaluate the status of sealed occlusal surfaces of the first permanent molars after one, two, and five years and to compare consequence of using the two different methods for enamel p...

During sowing of pesticide-treated seeds, pesticide-laden dust and abraded seed particles may be emitted to the environment, possibly leading to environmental contamination and posing health risks. In many countries there is currently no legislation concerning the acceptable amount of dust of treated seeds. This study aimed to gain insight in the abrasion potential of available pesticide-treate...

PURPOSE To compare three different treatment modalities for traumatic corneal abrasions. METHODS We conducted a prospective, randomized, masked, three-arm clinical study of patients presenting with superficial corneal foreign bodies. Treatment modalities were: (1) pressure patching with ofloxacin ointment (patch group, PG, n = 18), (2) therapeutic contact lens with ofloxacin eye drops (contac...

Recycled aggregates and geopolymer binders are green materials contributing to the sustainability of planet. We investigated performance concrete using recycled (fly ash (FA) ground granulated blast furnace slag (GGBS)) related their mechanical properties. Geopolymer were prepared by mixing 50% low calcium fly ash, GGBS, sodium hydroxide silicate solution, Coarse aggregate (Natural coarse aggre...