The Way Concrete Recycling Should Be

Tomosawa, Fuminori; Noguchi, Takafumi; Takao, Masaki

doi:10.3151/jact.3.3

Cited by 36 publications

(24 citation statements)

References 2 publications

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“…Comminution by different stages of crushers partially removes the old adhered cement paste from the natural aggregates and thus reduces the porosity of RCA (Kasai, 2006;Nagataki et al, 2004;Pedro et al, 2014;Pepe et al, 2014;Shima et al, 2005;Sui and Mueller, 2012;Tomosawa et al, 2005;Ulsen et al, 2013). Nagataki et al (2004) showed that using three stages of comminution led to a reduction of the water absorption of coarse RCA of 35-50% when comparing the first and third stages of crushing concrete with different strengths.…”

Section: Introductionmentioning

confidence: 97%

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Comminution and sizing processes of concrete block waste as recycled aggregates

et al. 2015

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Section: Introductionmentioning

confidence: 97%

“…Other techniques, such as heat treatment before comminution (milling in this case), were also used in processing to remove the cement paste (Shima et al, 2005;Tomosawa et al, 2005), but the energy consumption and generated CO 2 emissions could not be justified with the recycled aggregate improvement (Quattrone et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comminution and sizing processes of concrete block waste as recycled aggregates

et al. 2015

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“…The literature relating to studies on the durability characteristics of concrete made with RA is discussed in the following paragraphs. Tomosawa et al (2005) reviewed the background of concrete recycling and highlighted the importance of exact recycling processes. The authors discussed the methods of producing recycled concrete and stressed the importance of quality control during recycling of demolished concrete.…”

Section: Introductionmentioning

confidence: 99%

Durability aspects of HVFA-based recycled aggregate concrete

Saravanakumar¹,

Dhinakaran²

2014

Magazine of Concrete Research

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The utilisation of recycled coarse aggregate obtained from demolished concrete has gained momentum in recent years due to its contribution towards sustainability by minimising the use of artificially produced materials and eliminating environmental problems due to dumped waste materials. The present research exploited the possibility of producing high-volume fly ash (HVFA)-based recycled aggregate (RA) high-strength concrete. It was found that 50% of desired strength could be achieved even with 50% replacement of cement with fly ash and 50% of natural aggregate (NA) with RA. An attempt was thus made to study the effects of RA and HVFA on durability characteristics. The parameters considered were resistance to chloride ion penetration, acid attack, sulfate attack and sorption. It was found that replacement of NA with RA and cement with fly ash in higher volumes showed a way of considering economy and environmental effects as criteria, given a little bit of compromise towards strength and durability criteria but still falling well within an acceptable limit.

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“…Most of these advanced recycling technologies are developed in Japan (Shima et al 2005;Tomosawa et al 2005). They are based on grinding or rubbing of the concrete lumps crushed to a smaller size of 40-50 mm and heated to a temperature of 300°C.…”

Section: Production Technologies and Properties Of Recycledmentioning

confidence: 99%

Recycled Aggregate Concrete for Structural Use – An Overview of Technologies, Properties and Applications

Marinković

Ignjatović

Радоњанин

et al. 2011

Innovative Materials and Techniques in Concrete Construction

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By the end of the twentieth century generation of huge amounts of waste became one of the biggest environmental problems in the majority of the world. Construction and demolition waste (C&D) makes almost half of the total industrial waste. On the other hand, consumption of natural aggregate as the largest concrete component is constantly and rapidly increasing with the increase in the production and utilization of concrete. Recycling represents one way to convert a waste product into a resource. It has the potential to reduce the amount of waste disposed of in landfills and preserve natural resources while limiting environmental disturbance. This paper presents a review of traditional and advanced production technologies that make recycling of concrete in a completely closed loop technically feasible. The specific features of recycled aggregate concrete (RAC) mix proportioning methods affected by the recycled aggregate (RA) properties are presented. The mechanical, rheological and durability properties of RAC based on up-to-date research are discussed from the point of the potential of its utilization in structural concrete. The current state of technical rules and standards in this area is briefly presented. The future research and necessary actions in facilitating the more extensive use of RAC in concrete structures are also pointed out.

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The Way Concrete Recycling Should Be

Cited by 36 publications

References 2 publications

Comminution and sizing processes of concrete block waste as recycled aggregates

Comminution and sizing processes of concrete block waste as recycled aggregates

Durability aspects of HVFA-based recycled aggregate concrete

Recycled Aggregate Concrete for Structural Use – An Overview of Technologies, Properties and Applications

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