Physical–chemical and mineralogical characterization of fine aggregates from construction and demolition waste recycling plants

AbstractNowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.

Download Full-text

Financial and economic evaluation of construction and demolition waste recycling in Hanoi, Vietnam

Waste Management ◽

10.1016/j.wasman.2021.06.014 ◽

2021 ◽

Vol 131 ◽

pp. 294-304

Author(s):

Ngoc Han Hoang ◽

Tomonori Ishigaki ◽

Rieko Kubota ◽

Ton Kien Tong ◽

Trung Thang Nguyen ◽

...

Keyword(s):

Economic Evaluation ◽

Waste Recycling ◽

Construction And Demolition Waste ◽

Demolition Waste

Download Full-text

Environmental assessment of construction and demolition waste recycling in Bolivia: Focus on transportation distances and selective collection rates

Waste Management & Research ◽

10.1177/0734242x211029170 ◽

2021 ◽

pp. 0734242X2110291

Author(s):

Navarro Ferronato ◽

Gabriela Edith Guisbert Lizarazu ◽

Marcelo Antonio Gorritty Portillo ◽

Luca Moresco ◽

Fabio Conti ◽

...

Keyword(s):

Developing Countries ◽

Environmental Impacts ◽

Waste Recycling ◽

Construction And Demolition Waste ◽

Primary Data ◽

Demolition Waste ◽

Collection Rate ◽

Material Recycling ◽

Material Recovery ◽

Selective Collection

Construction and demolition waste (CDW) management in developing countries is a global concern. The analysis of scenarios and the implementation of life cycle assessment (LCA) support decision-makers in introducing integrated CDW management systems. This paper introduces the application of an LCA in La Paz (Bolivia), where CDW is mainly dumped in open areas. The aim of the research is to evaluate the benefits of inert CDW recycling in function of the selective collection rate, defined as the amount of waste (%wt.) sorted at the source in relation to the total waste amount produced, and the distances from the CDW generation to the material recycling facility. The outcomes of the research suggest that increasing the selective collection rates (5% to 99%) spread the importance of transportation distances planning since it affects the magnitude of the environmental impacts (1.05 tCO2-eq to 20.7 tCO2-eq per km traveled). Transportation limits have been found to be lower than about 40 km in order to make recycling beneficial for all environmental impacts and for all selective collection rate, with the eutrophication potential as the limiting indicator. The theoretical analysis suggests implementing LCA with primary data and involving statistics related to the transportation of virgin materials avoided thanks to recycling. The outcomes of the research support the implementation of CDW recycling in developing countries since it has been found that material recovery is always beneficial.

Download Full-text

A model for assessing the economic viability of construction and demolition waste recycling—the case of Ireland

Resources Conservation and Recycling ◽

10.1016/j.resconrec.2005.08.003 ◽

2006 ◽

Vol 46 (3) ◽

pp. 302-320 ◽

Cited By ~ 103

Author(s):

Xavier Duran ◽

Helena Lenihan ◽

Bernadette O’Regan

Keyword(s):

Waste Recycling ◽

Construction And Demolition Waste ◽

Economic Viability ◽

Demolition Waste

Download Full-text

Performance of Precursor Materials and Fired Ceramics for Structural Blocks

Materials Science Forum ◽

10.4028/www.scientific.net/msf.820.13 ◽

2015 ◽

Vol 820 ◽

pp. 13-17

Author(s):

Neila Gondim Azeredo ◽

Euzébio Barnabé Zanelato ◽

Jonas Alexandre ◽

Afonso Rangel Garcez de Azevedo ◽

Gustavo de Castro Xavier ◽

...

Keyword(s):

Building Construction ◽

Structural Ceramic ◽

X Ray Diffraction ◽

Mineralogical Characterization ◽

X Ray ◽

Physical Chemical ◽

Ceramic Blocks ◽

Clay Body ◽

Structural Blocks

The physical, chemical and mineralogical characterization of a precursor clay body before firing is of relevance for understanding the technological performance of the fired clay ceramic. In particular, structural clay ceramic blocks used in building construction need to attend standard properties specified by the norms. In the present work the precursor clay body, typically used to fabricate structural blocks in Campos dos Goytacazes, state of Rio de Janeiro, Brazil, was characterized in terms of particle size distribution, X-ray diffraction, chemical composition and Atterberg limits. In addition, the performance of structural ceramic blocks, fabricated from the extruded clay body and fired at 850oC, was evaluated. The results indicated that the ceramic mechanical strength complies with the Brazilian norm but the water absorption is higher than the maximum specified by the norm. The characteristic of the clay body contribute to justify the structural blocks performance.

Download Full-text

The State of the Art of Material Flow Analysis Research Based on Construction and Demolition Waste Recycling and Disposal

Buildings ◽

10.3390/buildings9100207 ◽

2019 ◽

Vol 9 (10) ◽

pp. 207 ◽

Cited By ~ 2

Author(s):

Dongming Guo ◽

Lizhen Huang

Keyword(s):

Material Flow ◽

State Of The Art ◽

Flow Analysis ◽

Material Flow Analysis ◽

Waste Recycling ◽

Construction And Demolition Waste ◽

Waste Processing ◽

City Development ◽

Demolition Waste ◽

Sustainable City

Construction and demolition waste (C&D waste) are widely recognized as the main form municipal solid waste, and its recycling and reuse are an important issue in sustainable city development. Material flow analysis (MFA) can quantify materials flows and stocks, and is a useful tool for the analysis of construction and demolition waste management. In recent years, material flow analysis has been continually researched in construction and demolition waste processing considering both single waste material and mixed wastes, and at regional, national, and global scales. Moreover, material flow analysis has had some new research extensions and new combined methods that provide dynamic, robust, and multifaceted assessments of construction and demolition waste. In this paper, we summarize and discuss the state of the art of material flow analysis research in the context of construction and demolition waste recycling and disposal. Furthermore, we also identify the current research gaps and future research directions that are expected to promote the development of MFA for construction and demolition waste processing in the field of sustainable city development.

Download Full-text

A Brief Analysis of Domestic Construction and Demolition Waste Recycling Techniques

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.509.1 ◽

2012 ◽

Vol 509 ◽

pp. 1-5

Author(s):

Su Ping Cui ◽

Qi Dong Liu ◽

Jian Hua Yan ◽

Xin Du

Keyword(s):

Natural Disaster ◽

Waste Recycling ◽

Recycled Concrete ◽

Construction And Demolition Waste ◽

Recycled Aggregate ◽

Demolition Waste ◽

Construction Waste ◽

Healthy Development ◽

Industrial Chain ◽

Recycling Techniques

In this paper, the construction and demolition waste (C&D waste) recycling techniques in China is summarized, and proposed the C&D waste recycling suggestions in this foundation. The C&D waste can be divided into construction waste, decorating waste, demolition waste and natural disaster ruin waste. In addition to be buried, domestic C&D waste can be made into landscape material, roadbed material, recycled aggregate, recycled brick, recycled concrete, recycled admixture and so on. The state should establish positive promoting policies, improve the recycling industrial chain, and promote the healthy development of the C&D waste recycling.

Download Full-text