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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Design and quality assurance for solid recovered fuel.

Karl E Lorber1, Renato Sarc, Alexia Aldrian

  • 1Montanuniversitaet Leoben, Institute for Sustainable Waste Management and Technology-IAE, Leoben, Austria. iae@unileoben.ac.at

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
|April 17, 2012
PubMed
Summary
This summary is machine-generated.

Efficient processing and quality assurance of solid recovered fuel (SRF) are crucial for co-incineration plants. This study details waste-to-fuel preparation, emphasizing effective removal of contaminants for high-quality SRF production.

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Area of Science:

  • Waste Management
  • Material Science
  • Environmental Engineering

Background:

  • Solid Recovered Fuel (SRF) is increasingly utilized in co-incineration plants.
  • Effective processing and quality assurance are vital for SRF's successful application.
  • SRF derived from municipal, commercial, and industrial wastes offers a sustainable energy alternative.

Purpose of the Study:

  • To describe the processing and quality assurance of Solid Recovered Fuel (SRF).
  • To present a multi-stage processing scheme for SRF production from various waste streams.
  • To evaluate the efficiency of contaminant removal and the quality of the final SRF product.

Main Methods:

  • Disintegration of the waste matrix through crushing and separation steps.
  • Removal of metals and inert materials (stones, glass, concrete).
  • Application of CEN/TS-guidelines and national norms (ÖNORM) for sampling and sample preparation.
  • Utilizing innovative laboratory equipment, including cutting mills with cyclones and mobile XRF instruments.

Main Results:

  • Efficient removal of metals and inert materials is achievable through multi-stage processing.
  • The study demonstrates successful preparation of SRF for specific applications like cement industry fuel.
  • Quality assurance protocols were developed and tested for heterogeneous waste fuel streams.

Conclusions:

  • A robust multi-stage processing scheme ensures efficient SRF production and contaminant removal.
  • Quality assurance based on established guidelines is essential for reliable SRF utilization.
  • Advanced laboratory equipment aids in effective quality assessment and material identification.