Experimental Investigation of Steel Fibre Reinforced Recycled Aggregate Concrete

Awchat, Ganesh; Kanhe, Narendra M.; Rathore, Shailendra

doi:10.37622/iraer/1.1.2011.47-59

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The water absorption content of aggregate refers to the pore that the aggregate can absorb and is expressed as open-pore. The figure shows the trends of basaltic recycled aggregate concrete used in this study and those from overseas for reference [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. In reference data.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Basalt-Based Recycled Aggregate Concrete for Jeju Island

et al. 2021

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Recycled aggregate is essential to protect Jeju Island’s natural environment, but waste concrete, including porous basalt, is a factor that lowers the quality of recycled aggregate. Therefore, an experiment was conducted to analyze the properties of concrete application of basalt-based recycled aggregate (B-RA) through quality improvement. The absorption of the B-RA ranged from 3–5%; restricting its absorption to less than 3% was challenging owing to its porosity and irregular shape. However, the increase in the solid volume percentage of the concrete when replacing 25 or 50% of fresh basalt aggregate with recycled basalt aggregate improved the mechanical performance of the concrete, especially at 25%, for which a compressive strength of 55.9 MPa and modulus of elasticity of 25.9 GPa exceeded those of concrete with fresh basalt aggregate. Moreover, increasing the replacement ratio of the fresh basalt with recycled aggregate reduced the slump and decreased the air content, consequently increasing the concrete drying shrinkage. However, the replacement of fresh basalt aggregate with recycled basalt aggregate unaltered the mechanical performance of the concrete. The results indicate that efficient use of recycled aggregates can yield superior performance to that of fresh basalt, irrespective of aggregate quality.

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Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Basalt-Based Recycled Aggregate Concrete for Jeju Island

et al. 2021

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“…This phenomenon apparently occurred because a relatively large amount of moisture was used at the beginning as reaction was promoted at a high temperature of 60 °C during steam curing. In relation to the amount of FA used, drying shrinkage increased as the FA substitution rate in- Figure 11 illustrates the relationship between the modulus of elasticity and compressive strength for concrete with B-RA; the data were obtained from the literature [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]. The water absorption of most overseas basalt is less than 1%.…”

Section: Drying Shrinkagementioning

confidence: 99%

Study on Mechanical Properties of Concrete Using Basalt-Based Recycled Aggregate and Varying Curing Conditions

Choi

Park

2022

Materials

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To replace porous basalt, the mechanical properties of concrete with recycled resources and durability improvement were analyzed in this study. The analysis was based on the quality improvement of recycled aggregate, use of fly ash, and changes in curing conditions. Basalt aggregate (BA) with a 3% water absorption, raw recycled aggregate and basalt (RRA), and improved recycled aggregate and basalt (PRA) were the main experimental variables. As PRA was applied to concrete, the compressive strength was lower than that of the specimen comprising BA in the normal strength region, but the modulus of elasticity (22.9 GPa) was equivalent or higher. The initial drying shrinkage increased because of the use of basalt-based recycled aggregate (B-RA). The drying shrinkage of PRA was similar to that of BA with an average difference of <7% as the age increased. The specimens subjected to steam curing exhibited the lowest drying shrinkage. These results showed that pores in the old paste of recycled aggregate increased freeze–thaw resistance because of the increase in the spacing factor. Although the PRA did not satisfy the quality criteria, the efficient use of recycled aggregate achieved an equivalent or higher performance than that of concrete comprising BA and improved durability.

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“…Regulations on recycled aggregate (i.e., Technical Code for Application of Recycled Aggregate Concrete (DG/TJ07-008) [2]) and higher consumption advisory policies (i.e., Directive 2008/98/EC [3]) are some of the actions on WC. However, although many regulations have been made, the construction and demolition waste (CDW) amount has been increased due to urban renewals [4][5][6][7][8], natural disasters [9,10] and wars [11] especially happened in the recent decades and 1950s. The solution to the mentioned problem by advanced techniques and approaches was an obligation and a necessity.…”

Section: Introductionmentioning

confidence: 99%

An investigation on effect of aggregate distribution on physical and mechanical properties of recycled aggregate concrete (RAC)

Dilbas

2022

Journal of Sustainable Construction Materials and Technologies

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The aim of the study is to optimize the aggregate gradation curve (AGC) for recycled aggregate concrete (RAC). Accordingly, TS 802 aggregate gradation curves such as A16, B16 and C16 and, also two proposed AGCs such as G1 and G2 are examined in the experiments. Hence, in total, 10 mixes are designed in consideration of A16, B16, C16, G1 and G2. The physical (density and water absorption) and the mechanical (compressive strength) properties are determined conducting the standard tests at the age of 28th days after a standard 22±2oC water curing. Also, a criterion weighting method such as Entropy Method is used in the evaluation of the properties of concretes and the weights of the properties of concretes are determined. Then, TOPSIS is used to find the best concrete in consideration of the design parameters and test results for the selection of the optimum AGC. As a result, the influence of AGC on the properties of natural aggregate concretes (NACs) and RACs are unsimilar and while A16 results in a denser NAC with higher compressive strength, C16 can be offered to decrease the open pore content of RAC in terms of water absorption leading a durable concrete with a higher compressive strength. Besides, the results of Entropy Method present interesting findings, and the coarse aggregate ratio in the mix is found as the most effective parameters among the investigated design parameters. However, the best AGCs are found as A16 for NAC and G2 for RAC according to TOPSIS results. It is concluded that further investigations are required.

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Experimental Investigation of Steel Fibre Reinforced Recycled Aggregate Concrete

Cited by 3 publications

References 3 publications

Mechanical Properties of Basalt-Based Recycled Aggregate Concrete for Jeju Island

Mechanical Properties of Basalt-Based Recycled Aggregate Concrete for Jeju Island

Study on Mechanical Properties of Concrete Using Basalt-Based Recycled Aggregate and Varying Curing Conditions

An investigation on effect of aggregate distribution on physical and mechanical properties of recycled aggregate concrete (RAC)

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