Development of thermo-mechanical treatment for recycling of used concrete

Sui, Yuwu; Mueller, Anette

doi:10.1617/s11527-012-9852-z

Cited by 76 publications

(17 citation statements)

References 3 publications

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“…The workability, mechanical strength, and durability of recycled concrete are adversely affected by recycled aggregate [1][2][3]. Many experiments were carried out to enhance the quality of recycled aggregate, e.g., incorporation of thermal and mechanical treatment [4] and carbonation treatment to strengthen the recycled aggregates [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

Sui

Liu

et al. 2020

Applied Sciences

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Waste concrete must be crushed, screened, and ground in order to produce high-quality recycled aggregate. In this treatment process, 15–30% waste concrete powder (<0.125 mm) can be generated. Hydration activity and the reuse of waste concrete powders (WCPs) were studied in this work, and the results illustrated that the particle size changed after a series of thermal treatments at temperatures from 400 ℃ to 800 ℃. The particle size of waste concrete powder decreased by 700 ℃ thermal treatment, and by 600 ℃ thermal treatment, it increased. More active elements appeared in WCP heated by 800 ℃. Nevertheless, the activity index (AI) of WCP, measured by the ratio of mechanical strengths between mortar with a 30% replacement of the cement with WCP and normal mortar without WCP, indicated that the WCP by 700 ℃ thermal treatment had an optimal AI value, which meant WCP treated at 700 ℃ could be used in mortar or concrete as an admixture.

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Section: Introductionmentioning

confidence: 99%

Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

Sui

Liu

et al. 2020

Applied Sciences

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“…Comminution by different stages of crushers partially removes the old adhered cement paste from the natural aggregates and thus reduces the porosity of RCA (Kasai, 2006;Nagataki et al, 2004;Pedro et al, 2014;Pepe et al, 2014;Shima et al, 2005;Sui and Mueller, 2012;Tomosawa et al, 2005;Ulsen et al, 2013). Nagataki et al (2004) showed that using three stages of comminution led to a reduction of the water absorption of coarse RCA of 35-50% when comparing the first and third stages of crushing concrete with different strengths.…”

Section: Introductionmentioning

confidence: 99%

Comminution and sizing processes of concrete block waste as recycled aggregates

et al. 2015

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“…Improvement percentage of RCA properties after acid soaking treatment(Tam et al 2007).Table 2 Improvement percentage of apparent particle of RCA after thermal-mechanical treatment(Sui and Mueller 2012).…”

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Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

128

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The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA), and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak zones lead to negative effects on the mechanical properties and durability performance of RAC. In order to utilize RCA in more effectively as aggregate in concrete, it is necessary to improve the quality and enhance the properties of the attached weak mortar. This paper reviews different treatment methods of RCA based on the published research, and systematically analyses the strengths and weaknesses as well as the applicability and limitations of each method. The advantages and disadvantages of each treatment method, in terms of their technical feasibility, efficiency, economic and environmental impacts, are also discussed, in view of facilitating the selection of the most suitable treatment method for RCA. Although most techniques have been examined and trialed under laboratory conditions, further investigations are required to determine the most effective approach for treating RCA, with consideration not only given to the laboratory scale, but also on a commercial production scale.

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Development of thermo-mechanical treatment for recycling of used concrete

Cited by 76 publications

References 3 publications

Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

Comminution and sizing processes of concrete block waste as recycled aggregates

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

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