scholarly journals Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

2017 ◽  
Vol 7 (10) ◽  
pp. 1090 ◽  
Author(s):  
Patrícia Favaretto ◽  
Gelsa Hidalgo ◽  
Carlos Sampaio ◽  
Rodrigo Silva ◽  
Richard Lermen
Keyword(s):  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Concrete Blocks ◽  
Foamed Concrete ◽  
South Of Brazil

scholarly journals Incorporation of recycled aggregates from construction and demolition waste in paver blocks

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Cinthia Maia Pederneiras ◽  
Maria Del Pilar Durante ◽  
Ênio Fernandes Amorim ◽  
Ruan Landolfo da Silva Ferreira
Keyword(s):  
Natural Resources ◽  
Mechanical Strength ◽  
Reference Sample ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
World Population ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
Concrete Blocks ◽  
Modified Block

ABSTRACT: The consumption of natural resources and energy increased proportionally with the growth of the world population and its economic level. There was an increasing exponential consumption of natural resources, which implied an increase in environmental impacts. The construction sector is responsible for a very significant production of construction and demolition waste (CDW). Thus, there is a concern in search of a more sustainable final disposal. Many studies have been investigated the development of new materials with the incorporation of recycled aggregates from CDW. This paper presents a study of performance evaluation of concrete blocks produced with CDW. For that purpose, an experimental campaign was performed, including a characterization of the aggregates used. The incorporation of 100% of fine and coarse recycled aggregates. The mixtures were designed according to the condition of the aggregate (dry, washed or saturated). The performance of these blocks was evaluated in terms of mechanical strength and water absorption. Some additional tests were also performed to deeper analyze of the microstructure of these blocks. To assess the durability of the concrete blocks, a full-scale road was built. The results were very positive, since there were no significant differences between the modified concrete blocks and the reference sample (0% of the CDW). The modified block with fine aggregate presented the best performance of all the blocks, concerning mechanical strength. In addition, the performance of concrete blocks with washed recycled aggregates had a better performance compared to the others. The results obtained were satisfactory for the application of the blocks in the streets with low movement and low load.

scholarly journals Study case about the production of masonry concrete blocks with CDW and kaolin mining waste

2021 ◽  
Vol 8 (6) ◽  
pp. 990-1004
Author(s):  
Felipe Bastos ◽  
◽  
Adeildo Cabral ◽  
Perboyre Alcântara ◽  
Lino Maia ◽  
...  
Keyword(s):  
Total Solid ◽  
Raw Material ◽  
Construction And Demolition Waste ◽  
Kaolin Clay ◽  
High Grade ◽  
Demolition Waste ◽  
The World ◽  
Concrete Blocks ◽  
Study Case ◽  
Natural Aggregates

<abstract> <p>The worldwide generation of construction and demolition waste is about 30% to 35% of the total solid waste produced annually. In addition, the extraction of minerals leaves a high-grade environmental liability with tailings, such as kaolin clay, Brazil being one of the countries with the largest deposits and production of this mineral in the world. The kaolin clay extraction serves several industries such as ceramics, crockery, and paper, among others. The objective of this work is to insert these two wastes as raw material of construction elements, specifically masonry concrete blocks, thus giving an end to the residues, demonstrating their reutilization potential. Here, blocks were manufactured with replacement of natural aggregates, stone powder, and sand, by construction and demolition waste and of kaolin clay waste. The replacement percentages were up to 34% and 16%, respectively. The blocks made with pneumatic vibration compacting procedure presented strength beyond than what is established by norm, thus giving a favorable perspective of use for these residues as building elements.</p> </abstract>

Production of Concrete Blocks with Residues for Civil Construction

2013 ◽  
Vol 690-693 ◽  
pp. 865-869 ◽  
Author(s):  
Marília Martinês de Camargo ◽  
Rosa Cristina Cecche Lintz ◽  
Luisa Andréia Gachet-Barbosa ◽  
Marta Siviero Guilherme Pires
Keyword(s):  
Value Added ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Structural Function ◽  
Demolition Waste ◽  
Original Product ◽  
Concrete Blocks ◽  
Function Blocks ◽  
Natural Aggregates

The Construction is recognized as one of the most important activities for the economic and social development, and on the other hand, behaves also as a major generator of environmental impacts, either by consumption of natural resources, the modification of the landscape or the generation of construction and demolition waste (CDW). Investing in an implementation of managed clean and healthy in the area of CDW is essential for the environment and for the economy of the cities, who are spending less resources on the collection, cleaning of drains and treatment of diseases. Nowadays, the amount of waste generated is considered large, occupying much space in landfills, and its transportation, depending on the volume and weight, is quite expensive. Recycling and reuse of these wastes are extremely important to control and mitigate environmental problems, as well as produce various materials value-added. Over 90% of waste can be recycled, reused and transformed into aggregates with characteristics very similar to the original product, thus creating environmentally friendly products such as sand, gravel, pebbles. This research concerns the study of the properties of concrete containing CDW, aiming its use in the manufacture of concrete blocks to seal without structural function. Blocks have been molded with partial replacement of natural aggregates by recycled aggregates and later were performed tests of compressive strength in accordance with the standards to prove the technical feasibility of the material for the trait studied.

scholarly journals Recycled Aggregates from Construction and Demolition Waste in the Production of Concrete Blocks

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Juan A. Ferriz-Papi ◽  
◽  
Simon Thomas ◽  
◽  
Keyword(s):  
Reference Sample ◽  
Substantial Reduction ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
The European Union ◽  
Demolition Waste ◽  
Two Samples ◽  
Concrete Blocks ◽  
The Uk

The construction industry generates large amounts of waste, usually mixed, which can be composed of different origin materials, most of them catalogued as non-hazardous. The European Union targets for this waste for 2020 have been already achieved by the UK, but it is mainly developed in downcycling processes (backfilling) whereas upcycling (such as recycle in new concrete batches) still keeps at a low percentage. The aim of this paper is to explore further in the use of recycled aggregates from construction and demolition waste (CDW) in concrete mixes so as to improve upcycling. A review of most recent research and legislation applied in the UK is developed regarding the production of concrete blocks. As a case study, initial tests were developed with a CDW recycled aggregate sample from a CDW plant in Swansea. Composition by visual inspection and sieving tests of two samples were developed and compared to original aggregates. More than 70% was formed by soil waste from excavation, and the rest was a mix of waste from mortar, concrete, and ceramics with small traces of plaster, glass and organic matter. Two concrete mixes were made with 80% replacement of recycled aggregates and different water/cement ratio. Tests were carried out for slump, absorption, density and compression strength. The results were compared to a reference sample and showed a substantial reduction of quality in both mixes. Despite that, the discussion brings to identify different aspects to solve, such as heterogeneity or composition, and analyze them for the successful use of these recycled aggregates in the production of concrete blocks. The conclusions obtained can help increase upcycling processes ratio with mixed CDW as recycled aggregates in concrete mixes.

Sound insulation of a hollow concrete blocks wall made with construction and demolition waste and wood-based panels as linings

2021 ◽  
pp. 1351010X2199364
Author(s):  
Rodrigo Scoczynski Ribeiro ◽  
Raylton Pereira de Sousa ◽  
Rosemara Santos Deniz Amarilla ◽  
Luis Henrique Sant’Ana ◽  
Márcio Avelar ◽  
...  
Keyword(s):  
Masonry Wall ◽  
Construction And Demolition Waste ◽  
Index Formula ◽  
Sound Insulation ◽  
Demolition Waste ◽  
Hygroscopic Properties ◽  
Construction Techniques ◽  
Concrete Blocks ◽  
Sound Reduction ◽  
Reduction Index

It is a well-discussed topic that Construction and Demolition Waste (CDW) can be recycled and used as aggregate in the construction sector. Generally, Brazilian construction techniques are based on hollow blocks or bricks and mortars as coating systems. This paper describes the sound insulation of a masonry wall built with hollow concrete blocks and CDW as aggregates. The measurements were performed according to the reverberant chamber method. Keeping sustainability in mind instead of applying cement mortar as coating system, Oriented Strand Boards (OSB) and Wood-Wool Cement Boards (WWCB) were used and also tested as acoustical linings. The panels were directly attached on the wall with nails in the receiving room. All types of panels increased the weighted sound reduction index ([Formula: see text]). Wood-based composites can also improve the air quality because of their hygroscopic properties. In summary, sustainable wall systems were characterized according to their sound insulation properties, presented as possible substitutes for traditional masonry walls.

scholarly journals Assessment of construction waste management practice: a case study in Costa Rica

2007 ◽  
pp. 85-95
Author(s):  
Lilliana Abarca ◽  
Ir. F.M. Scheublin ◽  
Hijmen Van Twillert
Keyword(s):  
Costa Rica ◽  
Management Practice ◽  
Developed Countries ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Construction Waste ◽  
A Value ◽  
Soil Piping ◽  
Concrete Blocks

The construction industry deals with the provision of shelter and infrastructure for acontinuing growing population and urbanization, especially in developing countries, Thissector is well known as a huge consumer of natural resources; which produces a significantquantity of construction and demolition waste, Data about the situation of construction wastegeneration in Costa Rica is scarce and the objectives of the study were to develop a baselinestudy to determine quantities and composition of the waste, as well as, motivators and barriersfor achieving a more sustainable activity, This paper draws the findings of the surveyundertaken by means of questionnaires, interviews and site visits, The composition basicallyis wood, soil, piping materials, corrugated roof sheets, wires, packaging materials (paper,plastic and cardboard), cement, concrete, blocks, paints and debris, The amounts (either byvolume or by weight) of these streams are unknown since the majority of the companies don'tkeep track of these data, It is suggested a value of I 00 kg/m2 as an educated guess of theamount of construction waste produced, This high amount, compared to lower values found inliterature for developed countries, could be explained by the general lack of awareness andinformation on environmental issues as well as lack of technologies, governmentalenforcement and market incentives to improve the environmental footprint of the sector,

scholarly journals Thermal resistance and conductivity of recycled construction and demolition waste (RCDW) concrete blocks

2017 ◽  
Vol 70 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Ivan Julio Apolonio Callejas ◽  
Luciane Cleonice Durante ◽  
Angela Santana de Oliveira
Keyword(s):  
Thermal Resistance ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Concrete Blocks

scholarly journals Eco-House Prototype Constructed with Alkali-Activated Blocks: Material Production, Characterization, Design, Construction, and Environmental Impact

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1275
Author(s):  
Rafael A. Robayo-Salazar ◽  
William Valencia-Saavedra ◽  
Sandra Ramírez-Benavides ◽  
Ruby Mejía de Gutiérrez ◽  
Armando Orobio
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Construction And Demolition Waste ◽  
Sustainable Construction ◽  
Alkali Activation ◽  
Demolition Waste ◽  
Earthquake Resistant ◽  
Concrete Blocks ◽  
Alkali Activated ◽  
Design And Construction

The interest of the construction industry in alkali-activated materials has increased to the extent that these materials are recognized as alternatives to ordinary Portland cement-based materials in the quest for sustainable construction. This article presents the design and construction of a prototype of an eco-friendly house built from concrete blocks produced using alkali activation technology or geopolymerization. The prototype meets the requirements of the current Colombian Regulations for Earthquake Resistant Buildings (NSR-10) and includes standards related to the performance of the materials, design, and construction method for earthquake-resistant confined masonry of one- or two-story buildings. The alkali-activated blocks were obtained from different precursors (aluminosilicates), including a natural volcanic pozzolan, ground granulated blast furnace slag, fly ash, construction and demolition waste (concrete, ceramic, brick, and mortar), and red clay brick waste. The physical-mechanical characterization of the alkali-activated blocks allowed their classification according to the structural specifications of the Colombian Technical Standard NTC 4026 (equivalent to ASTM C90). The global warming potential (GWP) or “carbon footprint” attributed to the raw materials of alkali-activated blocks was lower (25.4–54.7%) than that of the reference blocks (ordinary Portland cement concrete blocks). These results demonstrate the potential of alkali-activated materials for application in the construction of eco-friendly houses.

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