Investigation of combined effect of mixture variables on mechanical properties of cement treated demolition waste

One of high efficient ways to reuse the recycled construction and demolition waste (CDW) is to consider it as a road base material. The recycled CDW however is mainly a mix of recycled masonry and concrete with a wide variation in composition. This results that the mechanical properties of cement treated demolition waste are not only determined...

Durable and Sustainable Road Constructions for Developing Countries

This paper discusses the possibilities to build durable and sustainable pavement structures in developing countries. Attention will be paid to geometric design aspects which have a significant effect on pavement life. Following this attention will be paid to the importance of controlling wheel loads rather than axle loads. Also the importance of...

Assessment of the contaminants level in recycled aggregates and alternative new technologies for contaminants recognition and removal

One of the main challenging problems associated with the use of Recycled Aggregates (RA) is the level of mixed contaminants. For utilizing RA in high-grade applications, it is essential to monitor and minimise the content of the pollutants. To this extent the C2CA concrete recycling process investigates a combination of smart demolition,...

A survey on the construction and demolition waste in Mongolia

n many developing countries, the rapid growth of town and cities has generated a rising levels of waste and illegal dumps have become a serious issue. The booming construction industry in Mongolia has resulted in the production of massive amounts of CDW which is one of the largest waste streams. In Ulaanbaatar (UB) and other cities in Mongolia,...

Bottom-up policy support: Using a construction materials model to identify and quick scan circular opportunities

Although the need for a more circular economy is supported by diverse people in both politics as well as in the scientific community, implementation of circular principles in reality is rarely occurring. This study shows how quantitative models can help to develop new policies for enhancing circularity in the construction sector. By means of a...

Recycled aggregate in civil works and building construction

The sustainable development policies presently in place, along with the Paris Agreement on climate change, are clear indications that economic growth must be made environmentally sustainable to ensure the transition from a linear to a circular economy. Given the large volumes of construction and demolition waste (C&DW) generated, which account...

Development of an innovative process for the up-cycling of concrete waste

This study investigates the efficiency of electrodynamic fragmentation (EDF) technology for the up-cycling of concrete waste. Tests were performed at a continuous production scale at various operating conditions and showed that high liberation and recovery rates of aggregates were obtained after just one treatment step performed at 1 kWh/t....

Waste audit – securing good quality raw material from construction and demolition waste

Pre-demolition audit or waste audit is the tool to assess the materials to be removed from the building or infrastructure and their potential value by external experts prior to the demolition or renovation activity. Such audits are essential since they enable all stakeholders involved to get information of the composition of waste and make it...

A survey on the construction and demolition waste in Mongolia

In many developing countries, the rapid growth of town and cities has generated a rising levels of waste and illegal dumps have become a serious issue. The booming construction industry in Mongolia has resulted in the production of massive amounts of CDW which is one of the largest waste streams. In Ulaanbaatar (UB) and other cities in Mongolia,...

Construction and demolition waste as a resource for sustainable, very lowenergy buildings

The framework of the research presented in the paper is a project oriented to promote the use of construction and demolition waste (CDW) as a new resource for constructing sustainable and very low-energy buildings. Intensive research activities have been carried out in application of recycled concrete and recycled brick as a replacement of...

Urban mining and buildings: A review of possibilities and limitations

In recent years there has been growing interest in urban mining in buildings from various environmental and economic perspectives. Materials hidden in buildings are attractive alternatives to raw ones and building activities are responsible for a large share of urban waste in many societies. The paper presents an analysis of possibilities for...

Eco-efficiency assessment of technological innovations in high-grade concrete recycling

The increasing volume of Construction and demolition waste (CDW) associated with economic growth is posing challenges to the sustainable management of the built environment. The largest fraction of all the CDW generated in the member states of the European Union (EU) is End-of-life (EOL) concrete. The most widely applied method for EOL concrete...

Innovative technologies for recycling End-of-Life concrete waste in the built environment

Currently, natural resources are consumed at an alarming rate than their production (United Nations Environment Programme, 2014). This imposes unprecedented pressure on the environment. The problem seems to get worse with the present increase in population and demand for infrastructures. To alleviate these and other related problems, a circular...

Comprehensive study on the most sustainable concrete design made of recycled concrete, glass and mineral wool from C&D wastes

This study focuses on formulating the most sustainable concrete by incorporating recycled concrete aggregates and other products retrieved from construction and demolition (C&D) activities. Both recycled coarse aggregates (RCA) and recycled fine aggregates (RFA) are firstly used to fully replace the natural coarse and fine aggregates in...

An overview of the waste hierarchy framework for analyzing the circularity in construction and demolition waste management in Europe

The construction sector is the biggest driver of resource consumption and waste generation in Europe. The European Union (EU) is making efforts to move from its traditional linear resource and waste management system in the construction sector to a level of high circularity. Based on the theory of circular economy, a new paradigm called waste...

Life cycle assessment of material footprint in recycling: A case of concrete recycling

Meeting the current demand for concrete requires not only mining tons of gravel and sand, but also burning large amounts of fossil fuel resources in cement kilning. Consequently, concrete recycling is crucial to achieving a material-efficient society, especially with the application of various categories of concrete and the goal of phasing...