Currently, in civil engineering, high performance concrete i.e. concretes whose minimum compression strength is equal or more than 65 MPa are increasingly used. Side effect of it is need for determination of their construction strength. In particular, recently built high performance structures suffer from sampling of drill cores. Therefore, noninvasive impact hammers – to be specific Schmitt im...

Article history: Received: 13.04.2015. Received in revised form: 13.07.2015. Accepted: 15.07.2015. In this article, both chemical composition and structure of a high chromium iron hammer head were designed and analyzed respectively. Also, the casting process was investigated and optimized through numerical simulation using commercial software View Cast. On the basis of numerical simulation and ...

In Arteara (Canary Island), a Holocene rock avalanche comprises accumulation of large reddish blocks which cover the Fataga ravine. This course, is entrenched into Phonolitic Formation, an alternating sequence lava flows and ignimbrites. The defines elongated deposit variable thickness. A low friction angle was deduced, related to easily weathered bedrock favorable rolling blocks. movement woul...

The use of ultra-high performance concretes (UHPC) in the modern construction industry is increasingly widespread. UHPCs are a type concrete that provides advantages solving many engineering problems. have superior properties compared to conventional terms workability, self-settling, as well high strength and durability. However, although advantages, achieving desired workability one biggest ch...

This research aims at investigating the deterioration of limestone rocks due to influences thermal quenching and salt crystallization weathering tests predicting their long-term durability. Therefore, six types limestones were quarried from different provinces Egypt subjected 50 cycles 25 processes. The porosity, Schmidt hammer rebound hardness, ultrasound pulse velocity, Brazilian tensile stre...

The majority of evidence for cultural behavior in animals has come from comparisons between populations separated by large geographical distances that often inhabit different environments. The difficulty of excluding ecological and genetic variation as potential explanations for observed behaviors has led some researchers to challenge the idea of animal culture. Chimpanzees (Pan troglodytes ver...