Environmental performance of construction and demolition waste management strategies for valorization of recycled coarse aggregate

When recycled aggregates are used appropriately, it is possible to obtain good quality, economic and environmentally friendly building materials. The emergence in recent years of the use of recycled materials in the construction industry, specifically in the production of concrete, has met with varying degrees of success due to the barriers that the market for recycled products has still to overcome. Scientific studies have focused on the good properties presented by the coarse fraction of construction and demolition waste (CDW), leading to the formulation of various international recommendations which, although still insufficient, provide a stimulus to the use of recycled aggregates in concrete.

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Evaluating the Effectiveness of Construction and Demolition Waste Management Strategies

Proceedings of the 18th International Symposium on Advancement of Construction Management and Real Estate ◽

10.1007/978-3-642-44916-1_51 ◽

2014 ◽

pp. 531-538 ◽

Cited By ~ 1

Author(s):

Zezhou Wu ◽

Ann T. W. Yu

Keyword(s):

Waste Management ◽

Management Strategies ◽

Construction And Demolition Waste ◽

Demolition Waste

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Concrete performance evaluation of coarse aggregate replacement by civil construction waste

Revista Eletrônica em Gestão Educação e Tecnologia Ambiental ◽

10.5902/2236117043603 ◽

2020 ◽

Vol 24 ◽

pp. e52

Author(s):

Juliane Patricia Oliveira ◽

Carlos Henrique Dos Santos ◽

Maria Lúcia Okumura ◽

Natália Ueda Yamaguchi

Keyword(s):

Natural Resources ◽

Coarse Aggregate ◽

Construction And Demolition Waste ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Construction Sector ◽

Waste Generation ◽

Demolition Waste ◽

The Sustainable Development ◽

Recycled Coarse Aggregate

The construction sector is considered a major generator of environmental impacts due to the high consumption of natural resources and waste generation. Thus, this article aims to evaluate the performance of a concrete produced by the partial and total replacement of natural coarse aggregate by recycled coarse aggregate, derived from the concrete residue of buildings and demolitions. The study was made by comparing the compressive strength and absorption of three different concrete traces, keeping the water/cement factor of 0.60 and changing only the proportions of recycled coarse aggregate between 0%, 50% and 100%. The results showed that the higher the percentage of substitution, the greater the water absorption and the lower the resistance results concrete compression. This result was obtained due to the lighter characteristic of the recycled aggregate compared to the natural aggregate. It was concluded that the concrete produced with recycled aggregates could be used in nonstructural functions, giving an adequate destination to the construction and demolition waste and consequently reducing the extraction and consumption of natural resources and contributing for the sustainable development.

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Performance of Self Compacting Concrete with Partial Replacement of Coarse Aggregate with Recycled Coarse Aggregate

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.i8265.078919 ◽

2019 ◽

Vol 8 (9) ◽

pp. 1773-1777

Keyword(s):

Coarse Aggregate ◽

Cement Mortar ◽

Construction And Demolition Waste ◽

Partial Replacement ◽

Concrete Technology ◽

Demolition Waste ◽

Recycled Coarse Aggregate ◽

Slump Flow ◽

Mix Proportion ◽

Fresh State

Self Compacted Concrete (SCC) is an advanced approach for the purpose of placing of concrete.It is a concrete which does not require any external force,vibration or compaction and which is highly flowable, formwork is filled without any compaction and resistance to segregation. Workability tests for SCCin fresh state are Slump-flow, L-Box, JBox,V-Box are carried out.By using recommended EFNARC guidelines the mix proportion of concrete was prepared for M40 grade concrete is 1:1.75:1.87.Water cement ratio of 0.35 is constant.In this paper Natural Coarse Aggregate(NCA) is partially replaced upto 50% with 10% interval by Recycled Coarse Aggregate(RCA).RCA is prepared by crushing of cubes which are taken from concrete technology lab. Construction and Demolition waste is also used as RCA. RCA is submerged in water for 24 hours before using for the concrete mix,this is because RCA absorbs more waterdue to adhered cement mortar to aggregate. The various tests and their results are shown in this paper.

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