Crushed aggregate production from centralized combined and individual waste sources in Hong Kong

نویسندگان

  • Vivian W. Y. Tam
  • C. M. Tam
چکیده

Owing to the comprehensive building redevelopment programmes in Hong Kong, there is a huge volume of concrete waste generated that will soon exhaust all the available landfill areas. As such, recycled aggregate is advocated. However, the use of recycled aggregate has been confined to lower-grade applications until now, such as the lower layers of a pavement structures, e.g. capping and sub-base. The main reason is the variable behaviour of recycled aggregates collected from different sources to be crushed in a centralized recycling plant. This paper applies some international standards to classify recycled aggregates. Aggregates were collected from twelve sources, including ten from demolition sites (Samples 1 to 10), one from Tuen Mun Area 38 centralized recycling plant (Sample 11) and one from ordinary virgin aggregate (Sample 12). From test results, Sample 6, akin to Sample 12 (virgin aggregate), was found to be suitable for all types of construction applications, while Samples 2 and 9 were completely unsuitable as recycled aggregate concrete for any application grades. Sample 11 (Tuen Mun Area 38 centralized recycling plant) was found only suitable for non-structural applications, such as base course, and fill. It is concluded that the different sources of recycled aggregate should preferably be separately crushed and classified rather than processed centrally which will lower their overall quality and limit its application.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Heritage Conservationin Hong kong (Policy and Planning Context Review)

Since the enactment of the Antiquities and Monuments Ordinance in 1971 and the establishment of Antiquities and Monuments Office in 1976, the Hong Kong Government has set up several institutions with particular ordinances and schemes for Heritage Conservation. With the set-up of government initiatives, yet the protection of physical and cultural heritage is still limited due to the ambiguity of...

متن کامل

Prospect of Electronic Road Pricing in Hong kong

To cope with the urban congestion problem resulted from rapid urbanization some cities are successfully using Electronic Road Pricing policy as a demand management measure. In 1982, Hong Kong Governmenttook initiative to experiment electronic road pricing in Hong Kong. Though, the project outcome reveals that Electronic Road Pricing could bring tremendous economic, social and environmental bene...

متن کامل

Educational Values and the English Language Curriculum in Hong Kong Secondary Schools Since 1975

English is an important language in Hong Kong, an international city located on the southern coast of the People’s Republic of China that, for over 150 years to 1997, was a British colony. This paper describes and analyses changes in teaching methodologies in the English language curriculum formally proposed for Hong Kong junior secondary schools from 1975 to the present day, to study how the c...

متن کامل

The Contribution of Ageing to Hospitalisation Days in Hong Kong: A Decomposition Analysis

Background Ageing has become a serious challenge in Hong Kong and globally. It has serious implications for health expenditure, which accounts for nearly 20% of overall government expenditure. Here we assess the contribution of ageing and related factors to hospitalisation days in Hong Kong. We used hospital discharge data from all publicly funded hospitals in Hong Kong between 2001 and 2012.  ...

متن کامل

Techno-Economic Evaluation of Biodiesel Production from Waste Cooking Oil—A Case Study of Hong Kong

Fossil fuel shortage is a major challenge worldwide. Therefore, research is currently underway to investigate potential renewable energy sources. Biodiesel is one of the major renewable energy sources that can be obtained from oils and fats by transesterification. However, biodiesel obtained from vegetable oils as feedstock is expensive. Thus, an alternative and inexpensive feedstock such as wa...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2017