Development and analysis of highly workable high‐strength heavyweight concrete using magnetite aggregates

Abstract

Heavyweight concrete (HWC) is produced by replacing natural aggregates in a concrete mix design with heavyweight aggregates of a higher specific gravity. HWC is mainly used for the prevention of leakage from radioactive containing structures and is hence primarily used in the medical and nuclear energy industries where this property is of particular benefit and importance. Also, high‐strength concrete (HSC) has been increasingly employed in both civil structures, such as high rise buildings and bridges and defense applications. This study makes attempt to develop and evaluate different concrete mixes, which are considered as high‐strength, heavyweight and highly workable in nature. Such mixes use magnetite as the primary aggregate. The three‐mentioned properties of these concrete types have been thoroughly investigated individually; however, there is a limited numbers of literature on the analysis of mix designs dealing with the three‐mentioned properties simultaneously, in which the water/cement ratio variation, and/or variation of the magnetite content have been assessed. In this study, nine highly workable high‐strength HWC mixes have been developed and fresh and hardened properties are discussed. The overall result indicates that the developed mixes satisfied the required high‐strength, heavyweight and highly workable criteria, as well as, compressive strength would increase by increasing the heavyweight aggregate content.

A Review on Properties of Heavy Weight Concrete

“…In India the production of steel is about 72.2 million metric tons and from this only 25% is used for cement manufacturing[1], [58]. The HWC is not only being used in radiation shielding but due to its increased weight it is being used in the stabilization of high-rise building foundations [22]. The industrial waste is used as fiber in HWC which enhances the strength of HWC, thus the heavy weight concrete made by adding steel fibers are used in precast structures, offshore structure which is prone to extreme conditions.…”

“…Recently, researchers discovered that HWC can be used in a variety of industrial and construction settings. HWCs with high strength, selfcompacting, and green properties are produced under these conditions [22], [58], [64]. HWC applications, however, are limited in their expansion beyond reactive-powder and geopolymer-HWC.…”

Research on the safety assessment of RC workshop buildings in earthquake site based on the fuzzy comprehensive evaluation

“…The indexes of highperformance concrete are often better than those of ordinary concrete. [36][37][38][39][40][41] Therefore, if the high-performance concrete is used to column, earthquake damage to the column will be greatly reduced. Taking the workshop column and the plaster layer as an example, the detail categories and the corresponding detail seismic damage descriptions are shown in Table 1.…”

“…In general, the column is made of normal concrete rather than high‐performance concrete. The indexes of high‐performance concrete are often better than those of ordinary concrete 36–41 . Therefore, if the high‐performance concrete is used to column, earthquake damage to the column will be greatly reduced.…”

Argamassa para blindagem de raio-X contendo pigmento magnético de óxido de ferro obtido da drenagem ácida de minas / X-ray shielding mortar containing iron oxide magnetic pigment obtained from acid mine drainage

“…A busca por adequação e diminuição da geração de rejeitos pelas carboníferas é constante, porém ainda há muito para ser estudado, principalmente, quando se trata do reaproveitamento dos rejeitos na forma de produtos (matéria prima). Uma possível alternativa é a extração de óxido de ferro sintético a partir da DAM, os quais podem ser utilizados em concretos e argamassas com o intuito de blindagens de radiação (VOLKMAN, 2006;ALBUQUERQUE, 2014;ASLANI et al, 2020).…”