Zerkleinerung von Porenbeton in konventionellen Zerkleinerungsmaschinen der Bauschuttaufbereitung

Krampitz, Thomas; Lieberwirth, Holger; Hartl, Steffen; Nüsse, Alexander

doi:10.1002/cite.202200065

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…This is well correlated with the results obtained on flakiness and shape indexes' variation. Similar trends have also been described by many authors [22,46,55,56].…”

Section: Hardened Cement Paste Contentsupporting

confidence: 90%

“…The jaw crusher also produces flakier aggregates than the impact crusher. This can be explained by the breakage mechanism involved [11,22]. Composition does not seem to have any significant impact on the flakiness index, since the curves for the different compositions cross each other.…”

Section: Morphologymentioning

confidence: 93%

“…A very low percentage of recycled concrete aggregates (RCA) are used for the production of new concrete products because typical state-of-the-art recycling plants usually yield "lower-grade" RCA, presenting a lower density, higher water absorption [15][16][17][18][19], lower resistance to abrasion and higher sulfate content compared to the natural aggregates (NA) [20][21][22][23][24][25][26][27]. These properties of RCA, including its fine content and shape [28][29][30][31], have been shown to have a negative impact on the workability, strength and durability of recycled concrete prepared using RCA [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Crushing Method on the Properties of Produced Recycled Concrete Aggregates

Hubert,

Zhao,

Michel

et al. 2023

Buildings

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Construction and Demolition Waste (C&DW) is generated around the world and its quantity will increase in the future. Recycling has become the favored method of dealing with concrete waste but, to avoid its downcycling, it is important to develop a recycling process which is able to produce high-grade recycled concrete aggregates (RCA). To that end, studying the influence of the production process on the properties of RCA can prove to be a crucial step toward a more circular construction industry. In this study, the influence of the crushing method is investigated. Samples of five laboratory-made concretes have been crushed using the most common mechanical crushing methods (impact crusher and jaw crusher), and the particle size distribution, morphology, hardened cement paste content and water absorption of the produced RCA have been measured and analyzed. The findings indicate that the use of impact crushers results in the production of RCA possessing more spherical geometric characteristics, albeit with a broader particle size distribution and a relatively higher content of fine particles as compared to those obtained from jaw crushers. Additionally, it is observed that the employed crushing technique seemingly exerts no discernible impact on the hardened cement paste content and the water absorption in the context of the studied concretes.

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“…This is well correlated with the results obtained on flakiness and shape indexes' variation. Similar trends have also been described by many authors [22,46,55,56].…”

Section: Hardened Cement Paste Contentsupporting

confidence: 90%

Section: Morphologymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Crushing Method on the Properties of Produced Recycled Concrete Aggregates

Hubert,

Zhao,

Michel

et al. 2023

Buildings

View full text Add to dashboard Cite

show abstract

“…The labour costs, electricity/fuel demand, and maintenance costs are expected to be the most influencing aspects of the variable recycling costs. A life cycle assessment of pd-AAC recycling [17] and a study on AAC crushing [33] provides data on energy and fuel demand that is used to approximate electricity and fuel costs of 5 €/t. Furthermore, the recycling process is expected to run on a high level of automation.…”

Section: Input Datamentioning

confidence: 99%

Designing a new recycling network for post-demolition autoclaved aerated concrete (AAC) in Europe

Steins

Volk

Stallkamp

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Autoclaved aerated concrete (AAC) is a widely used building material for masonry blocks. Its porous structure and mineral composition lead to low thermal conductivity and fire resistance. European AAC production and usage strongly increased in the 1960s and 1970s. Therefore, assuming limited buildings’ lifetimes, significant post-demolition AAC volumes can be expected in the following decades. However, post-demolition AAC recycling in high-value environmentally friendly applications is still to be established as most post-demolition AAC is currently landfilled. Different recycling options for post-demolition AAC are presently being researched. However, a recycling network to implement these options is neither designed nor established. This contribution focuses on creating a European recycling network, including mathematical modelling, data acquisition, and solving the model. i.e. minimising the total costs. The mathematical modelling uses a capacitated warehouse location problem with multi-sourcing and direct delivery. Results show that recycling plants of smaller capacity (100,000 t input/a) are placed in the recycling networks in 2020 and 2025. With higher waste quantities being expected from 2030 onwards, plants with a larger capacity (200,000 t input/a) are added, especially in Poland, where the highest pd-AAC amount in Europe is expected. The recycling network shows a decentralised structure with numerous recycling plants to keep transport costs low. Most network costs result from variable processing costs, showing the highest cost increases from 2020 to 2050. Fixed costs increase with the higher number of recycling plants and account for the second-largest share of total network costs. Transport costs are comparatively low thanks to the decentralised structure of the network. Overall, waste generation is expected to increase by 226% from 2020 to 2050, while the total costs of the recycling network are expected to rise by 151% only. The results support decision-makers in fostering recycling and implementing a circular economy for post-demolition AAC.

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Zerkleinerung von Porenbeton in konventionellen Zerkleinerungsmaschinen der Bauschuttaufbereitung

Cited by 2 publications

References 15 publications

Effect of Crushing Method on the Properties of Produced Recycled Concrete Aggregates

Effect of Crushing Method on the Properties of Produced Recycled Concrete Aggregates

Designing a new recycling network for post-demolition autoclaved aerated concrete (AAC) in Europe

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