Fire Performance of Heavyweight Self-Compacting Concrete and Heavyweight High Strength Concrete

Aslani, Farhad; Hamidi, Fatemeh; Ma, Qilong

doi:10.3390/ma12050822

Cited by 27 publications

(20 citation statements)

References 55 publications

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“…In addition, the heavyweight aggregate ratios have shown an inverse proportion to the compressive strength due to the interaction between cement paste and the heavyweight aggregate, which causes weak adhesion between paste and structure of heavyweight aggregates [71]. The previous study has shown that the compressive strength decreased with an increase of the heavyweight aggregate [72,73]. Thus, the compressive strength recorded from HWSCC1, HWSCC2, and HWSCC3 mixes containing 50%, 75%, and 100% magnetite aggregates resulted in the compressive strength of 16.9%, 23.5%, and 7.7% lower than that of the maximum strength obtained from CM1 after 28 days, respectively.…”

Section: Resultsmentioning

confidence: 99%

Development of Heavyweight Self-Compacting Concrete and Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates

et al. 2019

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Heavyweight self-compacting concrete (HWSCC) and heavyweight geopolymer concrete (HWGC) are new types of concrete that integrate the advantages of heavyweight concrete (HWC) with self-compacting concrete (SCC) and geopolymer concrete (GC), respectively. The replacement of natural coarse aggregates with magnetite aggregates in control SCC and control GC at volume ratios of 50%, 75%, and 100% was considered in this study to obtain heavyweight concrete classifications, according to British standards, which provide proper protection from sources that emit harmful radiations in medical and nuclear industries and may also be used in many offshore structures. The main aim of this study is to examine the fresh and mechanical properties of both types of mixes. The experimental program investigates the fresh properties of HWSCC and HWGC through the slump flow test. However, J-ring tests were only conducted for HWSCC mixes to ensure the flow requirements in order to achieve self-compacting properties. Moreover, the mechanical properties of both type of mixes were investigated after 7 and 28 days curing at an ambient temperature. The standard 100 × 200 mm cylinders were subjected to compressive and tensile tests. Furthermore, the flexural strength were examined by testing 450 × 100 × 100 mm prisms under four-point loading. The flexural load-displacement relationship for all mixes were also investigated. The results indicated that the maximum compressive strength of 53.54 MPa was achieved by using the control SCC mix after 28 days. However, in HWGC mixes, the maximum compressive strength of 31.31 MPa was achieved by 25% magnetite replacement samples. The overall result shows the strength of HWSCC decreases by increasing magnetite aggregate proportions, while, in HWGC mixes, the compressive strength increased with 50% magnetite replacement followed by a decrease in strength by 75% and 100% magnetite replacements. The maximum densities of 2901 and 2896 kg/m3 were obtained by 100% magnetite replacements in HWSCC and HWGC, respectively.

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Section: Resultsmentioning

confidence: 99%

Development of Heavyweight Self-Compacting Concrete and Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates

et al. 2019

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“…To explain the observed trend, the higher water absorption capacity of heavyweight aggregate rather than normal weight aggregate, 8 and more compact microstructure 10 are the key parameters. However, at lower w/c ratios, by increasing the magnetite aggregate (up to 50% for w/c ratio equal to 0.25, and 75% for w/c ratio equal to 0.2), and subsequently increasing density, the compressive strength would reduce comparing to the control samples, indicating that higher water absorption capacity of heavyweight aggregates is an inhibitor for propagation of the internal structure of the concrete (calcium‐silicate‐hydrate gel) and gaining strength 46–48 . Notwithstanding, 100% magnetite content would increase the compressive strength even at lower w/c ratio which may be contributed to the more compact microstructure of the concrete 10 …”

Section: Resultsmentioning

confidence: 96%

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

Aslani

Lesslie

Hamidi

2020

Structural Concrete

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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.

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“…The authors found that by increasing the compressive strength of the concrete, the depth of spalling increased. Aslani et al [ 93 ] conducted an experiment using lightweight SCC. During the tests, high-strength and normal strength mixes were used.…”

Section: Influencing/mitigating Factorsmentioning

confidence: 99%

Heat-Induced Spalling of Concrete: A Review of the Influencing Factors and Their Importance to the Phenomenon

et al. 2022

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Heat-induced spalling in concrete is a problem that has been the subject of intense debate. The research community has, despite all the effort invested in this problem, few certain and definitive answers regarding the causes of and the way in which spalling happens. A major reason for this difficulty is the lack of a unified method for testing, which makes comparing data from various studies against each other a difficult task. Many studies have been performed that show the positive effects of using synthetic micro-fibres, such as polypropylene (PP). The mechanism with which PP fibres improve heat-induced spalling resistance in concrete, however, remains a subject of debate. This paper, therefore, looks at the work that has been performed in the field of spalling (particularly spalling of self-compacting concrete (SCC)). Influencing factors are identified and their links to each other (as reported) are discussed. A particular emphasis is put on discussing the role of PP fibres and how they improve the behaviour of high-performance concrete (HPC) at elevated temperatures. A brief summary of the reviewed papers are provided for each of the influencing factors to help the reader navigate with ease through the references. An introduction to heat-induced spalling and the common causes (as reported in the literature) is also included to highlight the wide range of theories trying to explain the spalling phenomenon.

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Fire Performance of Heavyweight Self-Compacting Concrete and Heavyweight High Strength Concrete

Cited by 27 publications

References 55 publications

Development of Heavyweight Self-Compacting Concrete and Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates

Development of Heavyweight Self-Compacting Concrete and Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates

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

Heat-Induced Spalling of Concrete: A Review of the Influencing Factors and Their Importance to the Phenomenon

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