Influence of treatment methods on the bond strength of recycled aggregate concrete

Pandurangan, K.; Dayanithy, A.; Prakash, S. Om

doi:10.1016/j.conbuildmat.2016.05.093

Cited by 187 publications

(74 citation statements)

References 29 publications

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“…The definition of SAM is the shrinkage increase coefficient of adhesive mortar, S AM = (V RAC TP /V NAC TP ) α . Since the shrinkage of RAC is related to the volume of the total mortar, the volume V RAC TP of the total mortar in RAC can be determined according to Equation (9). Then there is the following equation:…”

Section: Shrinkage Increasing Coefficient Of Attached Mortarmentioning

confidence: 99%

“…In the local area of the concrete, due to the shrinkage of internal stress, it is easy for problems such as cracks on the outer surface of the member to be created. In view of the fact that RAC has properties close to that of ordinary concrete [5][6][7][8][9][10][11][12], the structural adverse effects caused by shrinkage and creep are similar or even more serious than in natural concrete. Therefore, the research on the shrinkage and creep of RAC has an irreplaceable significance.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Liu

Zhu

et al. 2019

Applied Sciences

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The significant difference between recycled aggregate and natural aggregate is the content of the attached mortar layer. With the increase of the replacement rate of recycled aggregate, the shrinkage and creep of recycled aggregate concrete is significantly increased. In this paper, 180-day shrinkage and creep tests of recycled aggregate concrete with different water–cement ratios were designed in order to analyze the effect of the substitution rate and water–cement ratio on shrinkage and creep properties. The results show that the shrinkage strain of recycled aggregate concrete with a substitution rate of 50% and 100% at 180 days is 26% and 48% higher than that of ordinary concrete, respectively, and the growth of group II is 22% and 47%, respectively. When the load was 180 days old, the creep coefficient of recycled aggregate concrete with a substitution rate of 50% and 100% in group I increased by 19.6% and 39.6%, respectively compared with ordinary concrete, and group II increased by 23.6% and 44.3%, respectively. Based on the difference of adhering mortar content, the creeping increase coefficient and shrinkage increase coefficient of the attached mortar were proposed, and a shrinkage and creep model of recycled aggregate concrete was established. When compared with the experimental results, the model calculation results met the accuracy requirements.

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Section: Shrinkage Increasing Coefficient Of Attached Mortarmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Liu

Zhu

et al. 2019

Applied Sciences

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show abstract

“…After the crushing process, the RCA was classified into standard fractions: 0/4 mm, 4/8 mm, 8/16mm and 16/32 mm, according to EN 933-1:2012. Considering the fact that the majority of relevant studies do not recommend the application of fine RCA (0/4 mm) for concrete production, this component was not used in the research [1,11,12]. In comparison to the fine NA, the RCA has significantly larger specific surface, which requires an increased amount of water.…”

Section: Recycled Concrete Aggregatementioning

confidence: 99%

“…Consequently, the global demand for construction aggregate is huge, its production exceeding 26 billion tons per year [1]. This situation inevitably leads to many problems, such as the deficit of good-quality natural aggregate, increased distance between the sources of natural aggregate and construction sites, as well as the problem of disposal of large quantities of demolished concrete waste.…”

Section: Introductionmentioning

confidence: 99%

Mogućnost Primene Agregata Od Recikliranog Betona Kod Kompozita Mikroarmiranih Čeličnim Vlaknima

Zakić¹,

Despotović²,

Radević³

et al. 2017

Zbornik GFS

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“…The research work of recycled concrete aggregate is relatively earlier abroad, and the technology is relatively more mature, some countries published the technical standard of recycled concrete. K. Pandurangan et al [1] analyzed the effects of different treatment methods on the bond strength of recycled aggregate concrete; S. Laserna et al [2] analyzed the effects of two different types of aggregate on the strength properties of recycled concrete; P. Saravanakumar* et al [3] analyzed and compared the untreated RCA, natural coarse aggregates (NCA) and treated RCA respectively after H 2 SO 4 solution, HNO 3 solution, HCI solution and HCI+ silica fume solution. Though the related research started late in China, lots of research results have been obtained after the active exploring of many scholars.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physical Properties of High Quality Recycled Concrete Aggregate

Dai¹,

Li²,

Du³

et al. 2017

Proceedings of the 2016 International Conference on Architectural Engineering and Civil Engineering

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Abstract-The research beneficiated the concrete waste from two different sites to get the recycled concrete aggregates by the microwave-assisted mechanical beneficiation technology. Then, the author systematically studied the physical properties of recycled coarse aggregates and natural coarse aggregates from both macro and micro perspectives .The results show that: (1) in this experiment, the irradiation time per unit mass is about 5min/kg ~ 10min/kg, and the beneficiation rate is in 30% ~ 70%; (2) macroscopic physical experiments show that the recycled coarse aggregates obtained by the microwave-assisted mechanical beneficiation technology is basically the same with natural coarse aggregates in terms of water absorption, apparent density and mass loss., and its physical properties are the most optimal compared with other techniques. (3) from the microscopic point, the scanning electron microscope test shows that the mechanical process poses more damage to the recycled coarse aggregates than the microwave-assisted mechanical beneficiation technology through which the recycled coarse aggregates appears only several micro cracks in the cases after being magnified 5000 times, which is much equal to the natural coarse aggregates. In conclusion, this research validated the high quality of recycled coarse aggregates in the microwave-assisted mechanical beneficiation technology.

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Influence of treatment methods on the bond strength of recycled aggregate concrete

Cited by 187 publications

References 29 publications

Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Mogućnost Primene Agregata Od Recikliranog Betona Kod Kompozita Mikroarmiranih Čeličnim Vlaknima

Experimental Study on Physical Properties of High Quality Recycled Concrete Aggregate

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