Mixture Proportion Design Method of Steel Fiber Reinforced Recycled Coarse Aggregate Concrete

Gao, Danying; Zhang, Lijuan; Nokken, Michelle; Zhao, Jun

doi:10.3390/ma12030375

Cited by 21 publications

(16 citation statements)

References 35 publications

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“…However, as written earlier, the impact of additional cement is not significant, due to the increase by up to 10% of additional cement in concrete mixture with full replacement of natural aggregate [37]. The decline of the mechanical properties of RAC can be also reduced by using steel fiber reinforcement [39]. In this case study, the third approach was chosen, which means that the strength decline of RAC mixtures was compensated by a higher beam height-the beam height was increased by 4%.…”

Section: Environmental Assessment Methodologymentioning

confidence: 88%

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Pavlů¹,

Kočí

Hájek³

2019

Sustainability

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The main goal of this study was to compare two use cycles of natural aggregate concrete and recycled aggregate concrete, which is another way to compare the environmental impacts of recycled materials. A series of concrete mixtures with various replacement ratios of primary resources with recycled ones were prepared for this study. The mechanical properties of concrete mixtures were examined and were used for the design of structural elements in the same utilized properties. The two use cycles of a structural element were compared using life cycle assessment (LCA). In the first use cycle, the LCA of the structural element containing only primary raw materials was assessed. In the second use cycle, the LCA of a structural element in which primary materials were partially replaced by recycled ones was assessed. The obtained results confirm the potential use of high-quality recycled aggregate originating from local sources in some applications in building structures. Furthermore, the environmental assessment indicates the benefits of using recycled materials, such as environmental savings, especially the reduction of primary resource use, embodied energy, and embodied emissions, as well as reduction of the pressure on landfill sites.

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Section: Environmental Assessment Methodologymentioning

confidence: 88%

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Pavlů¹,

Kočí

Hájek³

2019

Sustainability

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“…At present, the studies on the mechanical properties of steel fiber reinforced concrete with recycled coarse aggregate (SFRCAC) mainly focus on the basic mechanical properties, such as Ramesh [ 22 ] investigated the split-tensile strength, compressive strength, the toughness under compression and the elastic modulus for 25 SFRCAC mixes. In addition, Gao et al [ 23 , 24 , 25 , 26 ] studied the compressive strength, flexural strength, durability and mixture proportion design method by taking the replacement ratio of reclaimed aggregate and the volume content of steel fiber as the influencing parameters. However, there are few studies on the shear properties of SFRCAC.…”

Section: Introductionmentioning

confidence: 99%

Effects of Groove and Steel Fiber on Shear Properties of Concrete with Recycled Coarse Aggregate

et al. 2020

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In this paper, a series of shear specimens with or without groove were manufactured to mainly analyze the effects of grooves (or shear section height) and steel fibers on the shear properties of concrete with recycled coarse aggregate through double-side direct shear test. In addition, the relationship between the shear strength and the compressive strength and splitting tensile strength of steel fiber reinforced concrete with recycled coarse aggregate (SFRCAC) was also discussed. The experimental results showed that the peak load, deformation corresponding to the peak load and calculated shear strength of the specimens with grooves were lower than those of the specimens without grooves. The steel fiber and recycled coarse aggregate (RCA) had a significant effect on the shear properties of SFRCAC. As the volume content of steel fibers increased, the shear strength of SFRCAC and the corresponding deformation increased gradually. With the replacement ratio of RCA increasing, the shear strength of SFRCAC decreased but the corresponding deformation increased gradually. Finally, the formula for calculating the shear strength of SFRCAC was proposed by analyzing and fitting the test results and the data of related literature.

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“…The W/C influences the strength of a composite. W/C is generally defined as the ratio between the initial cement and water weights used for the mixture [35]. With the same W/C, the addition of steel fibers significantly improves the compressive strength of concrete after 28 days [36].…”

Section: W/c Of Ccbsmentioning

confidence: 99%

Nonconventional Ca(OH)2 Treatment of Bamboo for the Reinforcement of Cement Composites

2020

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This study compares the structural and morphological changes in Guadua angustifolia Kunth (GAK) fiber prepared in three different ways (chips, barkless and crushed) when non-conventional alkaline treatment is applied. Moreover, it shows the improvement of mechanical properties of cement composites reinforced with these treated fibers. The three different preparations of Guadua were treated with a saturated solution of calcium hydroxide (5%) at 125 °C and 1.25 kPa for 3 h to remove non-cellulosic compounds. Then, their chemical, morphological, and structural properties were examined. The fibers exhibiting the higher delignification rate were selected to prepare cement composite boards, whose mechanical properties were successively compared with those of composites reinforced with untreated G. angustifolia fibers. The water/cement ratios of the cement mixed with the Ca(OH)2-treated and the untreated fibers were, respectively, around 0.3 and 0.25. The flexural strength and toughness of the two composites were evaluated after 7, 28, and 90 days of curing. The calcium hydroxide treatment showed higher efficiency in removing non-cellulosic materials when performed on crushed bamboo; moreover, the mechanical properties of the composites reinforced with the treated fibers were higher than those mixed with the untreated ones. After 90 days of curing, the flexural strength increased by around 40% and the toughness became three times higher (p < 0.05). The mechanical improvement by the Ca(OH)2 treatment of G. angustifolia fibers demonstrates its potential for the fabrication of cement composites.

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Mixture Proportion Design Method of Steel Fiber Reinforced Recycled Coarse Aggregate Concrete

Cited by 21 publications

References 35 publications

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Effects of Groove and Steel Fiber on Shear Properties of Concrete with Recycled Coarse Aggregate

Nonconventional Ca(OH)2 Treatment of Bamboo for the Reinforcement of Cement Composites

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