National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 The rheological or flow properties of concrete in general and of high performance concrete (HPC) in particular, are important because many factors such as ease of placement, consolidation, durability, and strength depend on the flow properties. Concrete that is not properly consolidated may have defects, such as honeyco...

in this paper, the effect of polypropylene fibers added to concrete on strength and thermal resistance of high strength concrete has been investigated. therefore, five tests have been carried out to reach this goal which it includes; effect of weight percent of polypropylene fibers on mechanical properties of concrete, effect of fiber’s length on the strength of high strength concrete, effect o...

syntax grammar Concrete syntax grammar Metamodel (result from mapping) Generate code Extend grammar automatically Figure 1: Grammar of Xcerpt in Reuseware The abstract and concrete syntax grammars of Xcerpt can be derived by separating concrete from abstract elements in the grammar from Listing 2. Additionally, each reference to a production rule in the abstract syntax grammar is tagged with a ...

The Ground Penetrating Radar (GPR) has been studied for a long time as a non-destructive evaluation (NDE) technology for inspection of concrete structures. Currently, the most widely used technique for interpreting GPR data of concrete bridge decks is the one that based on the amplitudes measured at various interfaces such as asphalt-concrete, top rebar, or slab bottom. The assumption behind th...

The article deals with the production of polystyrene concrete from recycled crushed in a rotary crusher waste foam packaging. resulting can be attributed to thermal insulation, used for insulation load-bearing structures buildings, as well structural and bearing layer outer walls low-rise buildings. dependence conductivity sample on density strength has been established, resistance shock loads ...