This paper presents the residual mechanical properties of concrete made with crushed bricks and clay roof tile aggregates after exposure to high temperatures. One referent mixture and eight mixtures with different percentages of replacement of natural aggregate by crushed bricks and roof tiles are experimentally tested. The properties of the concrete were measured before and after exposure to 2...

The present study concerns compressive and flexural constitutive models incorporated into an isoparametric beam finite element scheme for fiber reinforced polymer (FRP) and concrete composites, using their multi-axial constitutive behavior. The constitutive behavior of concrete was treated in triaxial stress states as an orthotropic hypoelasticity-based formulation to determine the confinement ...

Water circulation in storage tanks significantly impacts water quality distribution networks since old tends to have low residual chlorine concentrations that are insufficient neutralize microbial regeneration. Their large capacity and long residence times result uneven mixing, which can accelerate the disinfectant decay formation of potentially carcinogenic disinfection by-products. The phenom...

This paper explores the effects o f adding synthetic reinforcing fibres to highstrength reinforced concrete columns and in particular only to the cover o f the columns. An experimental program was conducted where seven circular reinforced concrete columns were tested with varying fibre content one contained no fibres, two contained fibres throughout the cross-section and four contained fibres o...

We analyze a signature scheme described in a recent Internet Draft, and highlight a variant (based on prior work of Micali and Leighton) that offers improved concrete security.

Recycled demolished concrete (DC) as recycled aggregate (RA) and recycled aggregate concrete (RAC) is generally suitable for most construction applications. Low-grade applications, including sub-base and roadwork, have been implemented in many countries; however, higher-grade activities are rarely considered. This paper examines relationships among DC characteristics, properties of their RA and...

Nile tilapia Oreochromis niloticus is one of the primary tilapia species being cultured. Much of the stocks being cultured are based on a limited number of collections from the wild, which may differ in their reproductive and growth characteristics. An evaluation of reproductive and growth characteristics of the Egypt, Ivory Coast, Sagana, and Lake Victoria strains of O. niloticus was done at A...