Experimental investigation on properties of recycled aggregate concrete with optimized Ball Milling Method

Dilbas, Hasan; Çakır, Özgür; Atiş, Cengiz Duran

doi:10.1016/j.conbuildmat.2019.04.007

Cited by 82 publications

(27 citation statements)

References 32 publications

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“…Hence the residual content should be determined for RA [ 20 ]. HCl solution can be used to determine the amount of residual on RA [ 26 ] ( Table 2 ). The remaining part over 4mm sieve was determined in the residual defining test after 0.1 M HCl solution attack to RA in a container.…”

Section: Methodsmentioning

confidence: 99%

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Dilbas

Güneş

2021

Materials

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This paper presents influence of treatment and mixing methods on recycled aggregate concretes (RAC) designed regarding various techniques. Absolute Volume Method (AVM) according to TS 802, Equivalent Mortar Volume Method (EMV), silica fume (SF) as a mineral addition were considered in the design of concretes. In total, four groups of concretes were produced in the laboratory: 1) natural aggregate concrete (NAC) designed with AVM as control concrete, 2) RAC designed with AVM as control RAC, 3) RAC with SF as a mineral addition designed with AVM as treated RAC and 4) RAC designed with EMV as treated RAC. The tests were performed at 28th days and the statistical analysis were made on the test results. According to the results, EMV and SF increased the compressive strength of concretes and this resulted an increase in the strength class of concrete. A significant statistical difference between the concretes were determined. According to multiple comparison analysis, it was found that especially there was a significant relationship among NAC, RAC and RAC-EMV. In addition, it was recommended that EMV and AVM with 5% SF could be used in the design of RAC rather than AVM only to achieve the target strength class C30/37.

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Section: Methodsmentioning

confidence: 99%

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Dilbas

Güneş

2021

Materials

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“…For instance, the water absorptions of NAC-G2 and RAC-G2 were determined as 3.2% and 4.5% while the same AGC consideration in the mix and the mentioned difference became clearer when the coarse aggregate concentration increased in the mix from 14 to 78%. As reported in the literature, RA had a porous structure with high-water absorption and low-density values [1,10,21,48] and it shaped the resulting concrete properties when RA was used in the mix. On the other hand, it can be indicated that the high fineness modulus the high coarse aggregate concentration, but the low natural aggregate concentration was observed by changing AGC from G1 to G2.…”

Section: Results Of the Second Stage Of The Experimental Programmentioning

confidence: 97%

“…[19] have been developed and suggested by researchers in their studies. At this point, it was commonly stated that the use of 20~30% RA had a minor effect on the properties of RAC [20] and treatment may have increased the optimum utilization ratio of RA (i.e., up to 60% RA treated with optimized ball mill method [10,[21][22][23][24] and up to 50% RA with new combination method [25]). Thus, it is meaningful to consider RA with a treatment method instead of the use of RA in the mix only and it has advantages, as expected.…”

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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“…To improve the mechanical properties of recycled aggregate concrete (RAC), scholars usually use concrete-modification technology. These modification techniques mainly include removing the cement mortar on the surface of the RCA (physical method) [ 6 , 7 , 8 ], filling the pores and cracks inside the RCA with chemical solutions (chemical method) [ 9 , 10 , 11 ], and doping fibers to improve the pore structure of the interface transition zone (ITZ) [ 12 , 13 , 14 ]. Compared with the complicated operation process of physical and chemical methods, the method of doping fibers is more convenient.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Mechanical Properties of Steel Fiber-Reinforced Recycled Concretes

2022

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A steel fiber-reinforced recycled concrete (SFRRC) is a porous material, and its macromechanical properties are affected by its microstructure. To elucidate the change rules and internal mechanisms of the mechanical properties of SFRRCs, the mechanical properties and failure modes of SFRRCs were studied at different water–cement ratio, replacement rate of recycled concrete aggregate (RCA), and steel fiber content. Moreover, the microstructures of the interface transition zones (ITZ) of the SFRRC specimens were tested by scanning electron microscopy and mercury intrusion, and the effect of the microscopic pore structure on the macromechanical properties of SFRRC was analyzed. The research results showed that an appropriate amount of steel fibers could reduce the size and number of cracks in the ITZ and improve the pore structure of an SFRRC. Based on the fractal dimension, porosity and other factors, the quantitative relationship between the macromechanical properties and microscopic pore structure parameters of SFRRCs was established.

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Experimental investigation on properties of recycled aggregate concrete with optimized Ball Milling Method

Cited by 82 publications

References 32 publications

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

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

Effect of Microstructure on the Mechanical Properties of Steel Fiber-Reinforced Recycled Concretes

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