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Home > Science, Technology & Agriculture > Civil engineering, surveying and building > The Use of Recycled Concrete in Construction: (English)
The Use of Recycled Concrete in Construction: (English)

The Use of Recycled Concrete in Construction: (English)

          
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About the Book

This dissertation, "The Use of Recycled Concrete in Construction" by Wing-kun, Fung, 馮永根, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled The Use of Recycled Concrete in Construction submitted by W.K. Fung for the degree of Doctor of Philosophy at the University of Hong Kong January 2005 Large amounts of construction and demolition (C&D) material are being generated in Hong Kong, and disposal outlets are rapidly filling up. Recycling has been identified as a viable solution to these problems for the sustainable development of Hong Kong. There is already considerable experience in Europe and Japan in the recycling of old concrete into aggregates for use in new concrete. Based on the Rilem Specification (1994) and the German Guidelines (1998), the HKSAR Government has developed a specification for the use of recycled aggregates in concrete construction, with a maximum content of recycled coarse aggregates of 20% and the strength grade of concrete capped at C 35. Since the pilot recycling plant at Tuen Mun Area 38 commenced operation in July 2002, it has been producing high quality recycled aggregates with water absorption of between 3 and 7% and particle density between 2300 and 2600 kg/m3. Hence there is a case to revisit the existing specification, originally designed for recycled aggregates of lower quality. This study addresses the two main issues in Hong Kong. It considers whether the content of recycled aggregates can be raised without affecting the properties of the new concrete, and whether the requirement to thoroughly wet the recycled aggregates before use can be waived. While strength tests had been carried out to substantiate existing specifications, the durability aspects of the recycled concrete have not been systematically studied. In this study, concrete specimens containing 0%, 20%, 40% and 60% recycled coarse aggregates were prepared and tested for strength, retention of workability, elastic modulus, shrinkage, resistance to chloride penetration, initial surface absorption and carbonation. It was found that the properties of concretes containing different percentages of recycled aggregates did not differ much from those of the control mixes, provided that the effective water/cement ratio was kept constant. Another series of tests was carried out with recycled aggregates of lower quality. Based on the findings of this study, it is recommended that the maximum content of recycled coarse aggregates be raised to 50% for Grade 30 concrete and below, and to 30% for Grade 35 to Grade 45. Lower replacement levels are suggested for recycled aggregates of lower quality. For workability control, it is recommended that allowance for water absorption should be made in determining the amount of mixing water and that retarders and plasticisers should be used, subject to satisfactory trials. The study also addresses the economic and environmental aspects of recycling. At present, recycled aggregates cannot compete with natural aggregates, but this will change when the disposal charging scheme becomes effective in mid 2005. Confidence in the effectiveness of recycled aggregates remains a problem, however, and will only be overcome by more demonstration projects. (448 words) DOI: 10.5353/th_b3051764 Subjects: Aggregates (Building materials) - China - Hong Kong - Testing Waste products as building materials - China - Hong Kong


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Product Details
  • ISBN-13: 9781374728981
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 282
  • Spine Width: 18 mm
  • Width: 216 mm
  • ISBN-10: 1374728985
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Series Title: English
  • Weight: 943 gr


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