Effect of fillers on the behaviour of low carbon footprint concrete at and after exposure to elevated temperatures

Lai, M.H.; Huang, Z.C.; Wang, C.T.; Wang, Y.H.; Chen, L.J.; Ho, J.C.M.

doi:10.1016/j.jobe.2022.104117

Cited by 27 publications

(12 citation statements)

References 63 publications

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“…The slump of concrete in all grades of ordinary cement used was kept constant at 190 mm using a polycarboxylate‐based superplasticizer, while in the case of using calcium aluminate cement, the slump was almost 100 mm in all grades of cement. It should be noted that according to past research, the use of cement substitutes and fillers in concrete including steel slag aggregates, improves flowability 32–34 . Therefore, in this research, the use of microsilica, in addition to improving the mechanical characteristics of HSC made with steel slag aggregates, also improves its flowability.…”

Section: Methodsmentioning

confidence: 67%

“…With regard to the fact that the used furnace (Figure 5) failed to satisfy the criteria of ISO 834-1 as suggested by References [39][40][41][42][43][44][45][46][47] a temperature of 10 C/min was considered for testing the specimens subjected to high temperatures (according to previous research [39][40][41][42][43][44][45][46][47] ) and kept at each target temperature for 60 min, describing the thermal shock and also reducing the possibility of explosion. It should be noted that the maximum operating temperature of the furnace used was 1200 C. After finishing the thermal loading, the furnace was turned off and the samples were gradually cooled in the furnace for 24 h; then, they were prepared for testing (according to previous research 32 ). HSC with steel slag specimens with ordinary cement without fibers experienced complete spalling after being heated at 800 C; however, those containing ordinary cement with polypropylene and steel fibers, as well as calcium aluminate cement, had only a few cracks.…”

Section: Heating Proceduresmentioning

confidence: 99%

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A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

Hajiaghamemar

Mostofinejad

Bahmani

2022

Structural Concrete

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Section: Methodsmentioning

confidence: 67%

Section: Heating Proceduresmentioning

confidence: 99%

A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

Hajiaghamemar

Mostofinejad

Bahmani

2022

Structural Concrete

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“…Figure 16 shows the slump and apparent density trends of all mixtures in terms of combined aggregate fineness modulus. The flowability of concrete containing 10 vol.% CR increases with the increase of fineness modulus since the average fine aggregate particles are getting smaller 61‐63 . The hydrophobic property of rubber enables more free water to participate in the flowing function and well explains the improvement in workability.…”

Section: Resultsmentioning

confidence: 98%

Impact of crumb rubber particle size on the mechanical and microstructure properties of rubberized concrete

Ren

Tian

et al. 2022

Structural Concrete

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Crumb rubber (CR) concrete (CRC) characterized with high ductility and environment friendliness, has recently been studied widely in the field of green concrete. Generally, high volume fraction of CR in cementitious system leads to low strength. However, the effect of CR particle size has not been concluded yet. This paper focuses on the impact of CR size on the mechanical and microstructure properties of CRC. Two novel substitution approaches of CR for natural fine aggregate are adopted. In total, 10 groups are designed and experimentally tested for their workability in fresh state and mechanical properties in hardened state. Brittleness coefficient, fineness modulus, and micro‐morphology of CRC were analyzed and discussed. Results show that as size of CR decreases, workability improves significantly, apparent density and strength exhibit a firstly decrease and then increase trend, with the lowest value obtained around 1.18 mm CR size. The brittleness of concrete was significantly improved in the presence of CR, and the improvement was more significant for smaller‐sized CR. Weak ITZs between CR particles and interfacial porosity are the main reasons for the sharp strength deterioration. Crack arresting effect of CR makes the crack propagation path more tortuous, and smaller particle‐sized CR exhibits greater capability.

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“…At the environmental level, we obtained a material saving of 68%. 17% of the saved materials were Portland cement, with a carbon footprint of 1.0 kg of CO 2 per 1.0 kg of the cement produced [8,9]. Rubble is reduced to the same percentage, reducing the environmental damage caused by extracting non-renewable raw materials and the final disposal of CDW in landfills.…”

Section: Resultsmentioning

confidence: 99%

Statistical Testing of the Bedoya Cone for Concrete Slump Tests: An Ecological Contribution from the Economy of Materials

Montoya¹,

Santa²,

Mejía-Barrera³

2023

cea

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This study shows the modification of the cone of Abrams. A new device size was obtained, with 68% savings in terms of the material. Similarly, we explored the contribution to the aspect of occupational health since, from an ergonomic perspective, the test can be developed at a more comfortable and safe height for the person. Furthermore, we found equivalence between the ranges of the Abrams cone and the Bedoya cone. According to the tests performed, it is possible to significantly reduce the consumption of materials for the slump test without affecting the quality of the result. It improves the ergonomics condition of laboratory workers, especially for women who are not allowed to lift heavy loads due to occupational health regulations. More than 60 tests were carried out in universities, construction sites, precast industries and nationally and internationally accredited laboratories. The methodology used consisted of carrying out the test using the same mixture and finding the slump with the Abrams cone and the Bedoya cone simultaneously under the same conditions of temperature, time and humidity. One important aspect is the possibility of using in mixtures with coarse aggregates of sizes 9.5 mm (3/8''), 13 mm (1/2''), 19 mm (3/4''), and 25.4 mm (1''), being these the most commercially made worldwide. The results and the statistical analysis allow us to conclude that it is possible to use the Bedoya cone to determine the concrete slump in the fresh state, since its ranges are directly applicable with respect to the Abrams cone. As it is a test that continues to be carried out daily in all countries of the world, this research is also a social and environmental contribution. The cone of Bedoya is registered in Colombia under the patent of invention number NC2016/0001514, and is being applied in Undergraduate, Master's and Doctorate research in this country and in México.

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Effect of fillers on the behaviour of low carbon footprint concrete at and after exposure to elevated temperatures

Cited by 27 publications

References 63 publications

A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

Impact of crumb rubber particle size on the mechanical and microstructure properties of rubberized concrete

Statistical Testing of the Bedoya Cone for Concrete Slump Tests: An Ecological Contribution from the Economy of Materials

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