Chemical–mineralogical characterisation of coarse recycled concrete aggregate

Limbachiya, Mukesh; Marrocchino, Elena; Koulouris, Angelos

doi:10.1016/j.wasman.2006.01.005

Cited by 100 publications

(76 citation statements)

References 7 publications

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“…RA-1 presents high content of Al 2 O 3 , that can be explained by the higher quantities of clay and ceramics and the higher proportions of chert (11).…”

Section: Characterization Of Recycled Aggregatesmentioning

confidence: 99%

Characterization and influence of fine recycled aggregates on masonry mortars properties

Saiz-Martínez¹,

González-Cortina²,

Fernández-Martínez³

2015

Mater. construcc.

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This research aims to study mechanical behaviour and relevant properties of masonry mortars fabricated using fine recycled aggregate in different mixture proportions. Fine recycled aggregates samples originated from the ceramic and concrete recycling process and coming from two recycling plants of Madrid region have been used. Tests were performed using 1:3:0.5 volumetric cement-to-aggregate-to-water ratio. Standardized sand with fine recycled aggregate replacement percentages were: 10%, 15%, 25%, 35% and 45%.A continuous size distribution curve can be observed and the main crystalline phases determined have been quartz, calcite and gypsum. Compressive strength, shrinkage and bond strength tests revealed poorer performance of recycled mortars compared to the conventional mortars; however, specific values are within the limits established by the manufacturers and standards. This study shows that cement-based mortars prepared with volumetric ratio 1:3:0.5 may contain up to 45% of fine recycled aggregates, without their properties being affected and without presenting significant losses. RESUMEN: Caracterización e influencia del arido reciclado fino en las propiedades de los morteros de albañilería.Esta investigación estudia el comportamiento mecánico y las propiedades más relevantes de los morteros de albañilería fabricados usando arenas recicladas en diferentes proporciones. Muestras pertenecientes a la línea de reciclaje cerámica y de hormigón proceden de dos centrales de reciclaje de la Comunidad de Madrid. Los ensayos se realizaron con una dosificación 1:3:0,5. Los porcentajes de arena reciclada fueron: 10%, 15%, 25%, 35% y 45%.Se observa una línea granulométrica continua y las principales fases cristalinas encontradas son cuarzo, calcita y yeso. Los ensayos de resistencia a compresión, retracción y adherencia muestran un peor comportamiento en los morteros reciclados frente a los morteros elaborados con arena normalizada, aunque dentro de los límites establecidos por normativas y fabricantes. Se deduce que, los morteros de albañilería base cemento, pueden incorporar un 45% de arena reciclada con una dosificación 1:3:0,5 sin que las propiedades ensayadas se vean afectadas con pérdidas significativas de prestaciones.

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“…RA-1 presents high content of Al 2 O 3 , that can be explained by the higher quantities of clay and ceramics and the higher proportions of chert (11).…”

Section: Characterization Of Recycled Aggregatesmentioning

confidence: 99%

Characterization and influence of fine recycled aggregates on masonry mortars properties

Saiz-Martínez¹,

González-Cortina²,

Fernández-Martínez³

2015

Mater. construcc.

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“…Particularly, there is no Muscovite in any samples of RAP as illustrated in Table 2 Quartz was the largest proportion in both RCA and RAP. This could be explained by a considerable amount of sand content that was derived from the establishment of original concrete and road surface [23]. Interestingly, Muscovite was only found in RCA due to such mineral is relation to the presence of brick and rock in construction waste.…”

Section: B Mineralogymentioning

confidence: 99%

Investigating Potential Environmental Issues of using Recycled Materials in Road Construction

2017

Aug. 8-9, 2017 Singapore Back RTET-17, CFBHS-17, IECMAE-17, AESTWM-17, LHHSS-17 &Amp; LEBCSR-17

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-Recycling of concrete and asphalt pavements has become the accepted approach to manage construction waste due to its economic and social benefits. Application of these products is mostly for road construction and low grade concrete due to the suitability of physical properties as an alternative product to replace the limited available quarry products. However, both the potential risk on human health and the environmental issues relating to use of recycled concrete aggregate (RCA) and reclaimed asphalt pavement (RAP) are a matter of concern. This paper provides a specific aspect of potential metals leaching in comparison with the ANZECC guidelines of water quality management. Also, this investigation comes up with a weak relationship between mineralogical compositions and leaching regime of metals, whereas availability of particle size distribution increases the ability of RCA and RAP to release metals.

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“…But, some authors reported that mortar content increased as the grain sizes increased, which was contradictory to other studies (Yagishita, Sano, & Yamada, 1994). Some authors pointed out that the properties of RCA depended on that of the original concrete (Padmini, Ramamurthy, & Mathews, 2009;Tam, Wang, & Tam, 2008), whereas some authors concluded that there was no or little effect of the original concrete (Limbachiya, Marrocchino, & Koulouris, 2007). However, as most of the research programmes were carried out on laboratory-produced original concrete ("labcrete"), only a few researches were based on the industrial produced original concrete ("realcrete").…”

Section: Introductionmentioning

confidence: 99%

Influence of granular fraction and origin of recycled concrete aggregates on their properties

Zhao

Courard

Michel

et al. 2017

European Journal of Environmental and Civil Engineering

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Large quantities of construction and demolition wastes are produced each year. In order to make good use of recycled concrete aggregates (RCA) in concrete, it is very important to study the influence of the granular fraction and the origin of RCA on their properties. In this study, RCA from industrial produced blocks (RCA_Blocks) and slabs (RCA_Slabs) were crushed and then separated into four granular fractions (0/2, 2/6.3, 6.3/14, 14/20 mm). Each granular fraction of RCA was physically characterised. Real RCA from recycling plant were also used for comparison. The results showed that recycled sands offered significantly higher cement paste content (higher bound water content) than coarse recycled aggregates. The fine RCA had therefore a higher water absorption coefficient compared to coarser fractions of RCA. The water absorption of finer fraction of RCA could be extrapolated precisely from the relationship between water absorption and cement paste content (or bound water content) of three coarse fractions of RCA. The values of hardened cement paste content obtained for the RCA_Blocks were lower than those measured on the RCA_Slabs, which was due to a smaller amount of initial cement paste content in blocks. The results showed that RCA_Slabs were more angular than RCA_Blocks.

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Chemical–mineralogical characterisation of coarse recycled concrete aggregate

Cited by 100 publications

References 7 publications

Characterization and influence of fine recycled aggregates on masonry mortars properties

Characterization and influence of fine recycled aggregates on masonry mortars properties

Investigating Potential Environmental Issues of using Recycled Materials in Road Construction

Influence of granular fraction and origin of recycled concrete aggregates on their properties

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