Influence of curing regime on properties of reactive powder concrete containing waste steel fibers

Xu, Xun; Liu, Yinghu

doi:10.1016/j.conbuildmat.2019.117129

Cited by 42 publications

(11 citation statements)

References 24 publications

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“…Overall, the results show that the contribution of the HAC to the strength was more apparent for the compressive strength as opposed to the flexural strength. These findings are in line with the majority of the studies in the literature which studied the effect of thermal and hydrothermal curing regimes [ 12 , 30 , 31 ]. The results of Figure 6 a,b show that the strength of hot air cured specimens was higher than that of the water cured specimens for all mixes with an increase ranging mostly from 6% to 14%.…”

Section: Resultssupporting

confidence: 90%

“…There are several plausible reasons which might have contributed to the strength increase and these include the increased reactivity of silica components and the reduced porosity which occur as a result of the enhanced rate of C-S-H production. Additionally, since the coefficient of concrete shrinkage is close to that of the thermal expansion, it is likely that the increase in temperature might have reduced the internal strains resulting from shrinkage, which in turn might have contributed to the strength increase [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

et al. 2021

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The use of different sustainable materials in the manufacture of ultra-high-performance concrete (UHPC) is becoming increasingly common due to the unabating concerns over climate change and sustainability in the construction sector. Reactive powder concrete (RPC) is an UHPC in which traditional coarse aggregates are replaced by fine aggregates. The main purpose of this research is to produce RPC using dune sand and to study its microstructure and mechanical properties under different curing conditions of water curing and hot air curing. The effects of these factors are studied over a long-term period of 90 days. Quartz sand is completely replaced by a blend of crushed and dune sand, and cement is partially replaced by using binary blends of ground granulated blast furnace slag (GGBS) and fly ash (FA), which are used alongside silica fume (SF) to make a ternary supplementary binder system. Microstructural analysis is conducted using scanning electron microscopy (SEM), and engineering properties like compressive strength and flexural strength are studied to evaluate the performance of dune sand RPC. Overall, the results affirm that the production of UHPC is possible with the use of dune sand. The compressive strength of all mixes exceeded 120 MPa after 12 h only of hot air curing (HAC). The SEM results revealed the dense microstructure of RPC. However, goethite-like structures (corrosion products) were spotted at 90 days for all HAC specimens. Additionally, the use of FA accelerated the formation of such products as compared to GGBS. The effect of these products was insignificant from a mechanical point of view. However, additional research is required to determine their effect on the durability of RPC.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

et al. 2021

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“…The hot cured samples exhibited higher flexural strength at all temperature exposures, as compared to those cured in normal water. When the samples were subjected to the elevated temperatures, the rate of decrease of flexural strength in the hot cured samples was lower than that of the normal cured samples, due to better and denser microstructures caused by the hot water curing [ 12 , 13 , 32 , 33 , 34 ] leading to better resistance at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…The use of hybrid steel fibers, i.e., straight and hooked, has been reported to improve the flexural and tensile strength of RPC in contrast to when only micro steel fibers were employed [ 10 , 11 , 12 ]. The use of waste steel fibers has also proved to be effective and sustainable for the production of RPC [ 13 , 14 ]. On one hand, increase in cement content and removal of cheaper coarse aggregates has increased the cost of RPC, yet, on the other hand, it has offered benefits of reducing members’ cross-section that leads to reduced dead load [ 15 ], and partial or total removal of passive reinforcement due to the use of fibers [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Elevated Temperature Performance of Reactive Powder Concrete Containing Recycled Fine Aggregates

Salahuddin

Qureshi²,

Nawaz

et al. 2020

Materials

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This study examines the effect of elevated temperature on various properties of reactive powder concrete (RPC) containing varying percentages of recycled fine aggregates as sand replacement. Recycled fine aggregates were collected from two sources, i.e., demolished normal strength concrete and demolished RPC. The specimens were prepared using 25%, 50%, and 75% replacement of natural sand with recycled fine aggregates, exposed to two different curing conditions and were subjected to four temperatures, i.e., 25, 200, 400, and 600 °C. Later, the specimens were tested for mass loss, compressive strength test, split-tensile strength test, flexural strength test, and water absorption test at all temperature ranges. Results determined that although the mechanical properties degraded with the temperature rise, the recycled aggregates can be employed as a partial replacement of natural sand in RPC without causing a significant decrease in the performance of RPC, and can help to produce more sustainable RPC by using recycled aggregates.

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“…Un neumático típico contiene un 17 % de cables de acero y la gran mayoría de estos cables de acero de desecho se utilizan en la industria de producción de hierro [18]. Además, se creía que utilizar fibras de acero de bajo precio y garantizar el rendimiento del hormigón en polvo reactivo lograría aminorar el costo de este en gran medida y hacer que esté ampliamente disponible [19].…”

Section: Introductionunclassified

Comportamiento físico-mecánico del hormigón adicionando residuos de acero: una revisión literaria

Muñoz-Pérez

Cabrera-Alcántara

Bravo

et al. 2021

Revista UIS Ingenierías

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En la actualidad, el interés por usar materiales de desecho y subproductos provenientes del hormigón ha incrementado, debido a la necesidad de minimizar la contaminación en el planeta. El presente documento tiene como objetivo la revisión sistemática de la literatura con respecto a la implementación de los residuos de acero en la mezcla de hormigón, y cómo esto influye en su comportamiento físico-mecánico. Se ha enfocado el interés principalmente en los residuos de acero en forma de escoria, limadura, viruta y fibras, incorporados en todo tipo de hormigón estructural, utilizado en columnas, vigas, zapatas, losas y muros. El uso de estos materiales tiene un alto impacto, pues no solo ayuda a reducir el costo de fabricación de cemento y hormigón, sino que a la vez otorga numerosos beneficios ecológicos, como reducir el costo de los vertederos, ahorrar energía y proteger el medio ambiente de una posible contaminación. Se efectuó la búsqueda de artículos indexados en las diversas bases de datos, tales como ASCE, EBSCO, Google Scholar, ScienceDirect, Scopus y SpringerOpen; se seleccionó finalmente un total de 60 artículos publicados desde el año 2014. Se concluye que el uso de residuos de acero es una alternativa para incorporar a la mezcla de hormigón, pues puede reemplazar parcial o totalmente al agregado y lograr la producción de hormigones que no presenten afección en sus propiedades físico-mecánicas; e incluso, en algunos casos, mejorar dichas características.

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Influence of curing regime on properties of reactive powder concrete containing waste steel fibers

Cited by 42 publications

References 24 publications

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing

Elevated Temperature Performance of Reactive Powder Concrete Containing Recycled Fine Aggregates

Comportamiento físico-mecánico del hormigón adicionando residuos de acero: una revisión literaria

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