Alkali-Silica Reactivity of High Density Aggregates for Radiation Shielding Concrete

Potential for Alkali–Silica Reaction in Radiation Shielding Concrete Containing Special Aggregates

In the present study, the potential for the alkali–silica reaction (ASR) in radiation shielding concrete containing special aggregates is presented. The tests were performed on two kinds of aggregate: (1) high-density aggregate to absorb the gamma radiation (barite, magnetite, and hematite) and (2) mineral with high bound water content to attenuate the neutron flux (serpentinite). The optical m...

Development of High- Performance Heavy Density Concrete Using Different Aggregates for Gamma- Ray Shielding

The performance requirements of the concrete of containment structures are mainly radiological protection, structural integrity and durability, etc. For this purpose, highperformance heavy density concrete with special attributes can be used. The aggregate of concrete plays an essential role in modifying concrete properties and the physico-mechanical properties of the concrete affect significan...

Production of an economic high-density concrete for shielding megavoltage radiotherapy rooms and nuclear reactors

Background: In megavoltage radiotherapy rooms, ordinary concrete is usually used due to its low construction costs, although higher density concrete are sometimes used, as well. The use of high-density concrete decreases the required thickness of the concrete barrier hence, its disadvantage is its high cost. In a nuclear reactor, neutron radiation is the most difficult to shield. A method for p...

Domain size as a parameter for studying the potential alkali-silica reactivity of chert-bearing aggregates

A Study of the Influence of Slag Alkali Level on the Alkali-Silica Reactivity of Slag Concrete

Ground granulated blast furnace slag (ggbs), can reduce the alkali load in concrete, despite its relatively high alkali content. Most research has been devoted to the efficacy of slag with an alkali content of less than 1.0% and this is reflected in guidance documents. A comparative assessment was made of the effect, if any, of the alkali level of ggbs on potential alkali-silica reactivity. Exp...