Laboratory evaluation of treated recycled concrete aggregate in asphalt mixtures

Kavussi, Amir; Hassani, Abolfazl; Kazemian, F.; Taghipoor, Mohammad

doi:10.1007/s42947-019-0004-5

Cited by 31 publications

(7 citation statements)

References 28 publications

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“…The treatment's multi-stage procedure may be carried out without the need for large amounts of energy consumption or sophisticated mechanical equipment [28]. He reasoned that this approach would considerably cut down on the quantity of garbage that was thrown away and ended up in landfills.…”

Section: Chemically Modified Slurry Of Calcium Metasilicatementioning

confidence: 99%

A pragmatic review paper on the use of recycled aggregates in concrete

Purohit,

Samaiya,

Babu

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The incorporation of recycled aggregate into concrete may have a number of potential benefits, one of which is the maintenance of the natural environment, which also contributes to the expansion of the economy. In the not too distant future, recycled aggregates are destined to take the lion’s share of the market for construction materials. Recycled aggregate is rapidly being utilised as a kind of construction material in a broad variety of building projects throughout a number of nations in Europe, North America, and Asia. These building projects can be found in a variety of countries. These countries are among those that are taken into account: In an effort to increase the amount of recycled aggregate that is employed in building projects, several nations are relaxing some restrictions that regulate infrastructure. This is being done in an effort to improve the quantity of recycled aggregate that is used. Within the scope of this investigation, we will look at the fundamental characteristics of recycled fine aggregate in addition to recycled coarse aggregate. In addition to that, it investigates these properties by considering natural aggregates as a reference point. In this study, the researchers investigated a wide variety of treatment strategies, such as Cement treatment, mineral additives, modified concrete mixers, and mineral admixtures, warm mix asphalt and hydrated lime, CO2 curing technique, silica gel techniques, waste oil and asphalt emulsion, mechanical grinding or ball milling, thermal treatment, chemical and calcium metasilicate slurry, carbonation and wrapping methods, non materials, and super plasticizability. The researchers found that chemical treatment, mechanical The application of a ball mill, another kind of grinding equipment, or a certain kind of chemical method might be used. The particulars of each therapy approach, as well as the outcomes of employing each treatment strategy, are explained in a way that is simple to comprehend and does not delve into excessive detail.

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Section: Chemically Modified Slurry Of Calcium Metasilicatementioning

confidence: 99%

A pragmatic review paper on the use of recycled aggregates in concrete

Purohit,

Samaiya,

Babu

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The United States [4], Australia [5], China [6], and Thailand [7] produced C&D materials of 584, 19.6, 1130, and 1.1 million tons, respectively. Several researchers have explored the use of recycled concrete aggregate (RCA) in pavement construction [8][9][10][11][12][13][14][15][16][17]. They reported that RCA needs to be improved by a binder (cement, lime, and fly ash) due to low physical properties (high water absorption and porosity) and engineering properties (low strengths) [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers have explored the use of recycled concrete aggregate (RCA) in pavement construction [8][9][10][11][12][13][14][15][16][17]. They reported that RCA needs to be improved by a binder (cement, lime, and fly ash) due to low physical properties (high water absorption and porosity) and engineering properties (low strengths) [11][12][13]. Nonetheless, cement manufacturing emits huge quantities of carbon dioxide (CO 2 ) into the atmosphere [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Recycled Concrete Aggregate Using High Calcium Fly Ash Geopolymer as Pavement Base Material

et al. 2022

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This research investigated high calcium fly ash geopolymer stabilized recycled concrete aggregate (RCA-FAG) as pavement base material. The effect of recycled concrete aggregate (RCA):high calcium fly ash (FA) ratios, sodium silicate (Na2SiO3):sodium hydroxide (NaOH) ratio, and curing time on the unconfined compressive strength (UCS) and scanning electron microscope (SEM) properties of RCA-FAG samples were evaluated. The maximum dry unit weight of the RCA-FAG sample was 20.73 kN/m3 at RCA:FA ratio of 80:20 and Na2SiO3:NaOH ratio of 60:40. The 7-d UCS of RCA-FAG samples increased as the FA content and Na2SiO3:NaOH ratio increased. The 7-d UCS of the RCA-FAG sample was better than that of the RCA with no FA because FA particles filled in RCA particles, resulting in a dense matrix. The 7-d UCS of RCA-FAG samples passed the 7-d UCS requirement for the low-traffic road. All ingredients met the 7-d UCS requirement for the high-traffic road except the sample with RCA:FA of 100:0 and Na2SiO3:NaOH of 50:50 and 60:40. The 7-d SEM images indicated that spherical FA and RCA particles are bonded together, resulting in the dense matrix for all Na2SiO3:NaOH ratios. The proposed equation for predicting the UCS of RCA-FAG offered a good coefficient of correlation, which is useful in designing pavement base material from RCA-FAG material.

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“…Los tratamientos térmicos tienen como objetivo someter el rca a elevadas temperaturas (superiores a 500ºC) e inmediatamente sumergirlo en agua fría con el fin de generar agrietamiento térmico superficial y generar posteriormente el desprendimiento del mortero de recubrimiento [19]. Algunos autores recomiendan el uso de aditivos químicos, emulsiones asfálticas y residuos de aceites de cocina, entre otros para tratar la superficie de los agregados reciclados y reducir la absorción [23], [24], [25], [26], [27]. La utilización de estos tratamientos químicos superficiales han mejorado el comportamiento mecánico de las mezclas asfálticas evaluadas [26], [25], [27].…”

Section: Introductionunclassified

“…Algunos autores recomiendan el uso de aditivos químicos, emulsiones asfálticas y residuos de aceites de cocina, entre otros para tratar la superficie de los agregados reciclados y reducir la absorción [23], [24], [25], [26], [27]. La utilización de estos tratamientos químicos superficiales han mejorado el comportamiento mecánico de las mezclas asfálticas evaluadas [26], [25], [27]. Sin embargo, existen limitaciones por los altos costos económicos, las condiciones ambientales particulares de uso y la falta de homogeneización del material alternativo (rca) tratado en campo [23].…”

Section: Introductionunclassified

Evaluación de una mezcla asfáltica con incorporación de agregados reciclados de concreto tratados superficialmente con una solución química de sulfato de magnesio

Morales

Losada

Quintana

2022

Cien.Ing.Neogranadina

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El presente artículo analizó en laboratorio el uso de Agregados Reciclados de Concreto (RCA) cuando son incorporados como agregados gruesos en una mezcla asfáltica densa en caliente mdc-19. El principal problema de la utilización del RCA en mdcs es su elevada absorción originada por el mortero que recubre las partículas, lo cual origina un incremento del contenido óptimo de asfalto y, consecuentemente, altos costos de producción. Para solucionar tal problema, se realizaron tratamientos químicos sobre la superficie del agregado RCA utilizando 1, 3 y 5 ciclos de inmersión en una solución de sulfato de magnesio, conforme al ensayo de durabilidad de agregados especificado por AASHTO T 104-99. Sobre las mezclas que incorporaron RCA (con y sin el tratamiento químico), fueron ejecutados ensayos de resistencia bajo carga monotónica (Marshall y resistencia a la tracción indirecta) y resistencia al desgaste a la abrasión Cántabro. Los resultados evidencian que la utilización del RCA tratado químicamente en la fabricación de mezclas asfálticas aumenta la resistencia bajo carga monotónica (ensayo Marshall y resistencia a la tracción indirecta en condiciones secas), proporcionando mayor cohesión y un leve aumento en la adherencia con referencia a la mezcla de control. Adicionalmente, se evidenció que el agregado RCA sometido a 5 ciclos proporciona similar resistencia en la mezcla asfáltica a la tracción indirecta bajo condición húmeda y desgaste Cántabro que la muestra de control.

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Laboratory evaluation of treated recycled concrete aggregate in asphalt mixtures

Cited by 31 publications

References 28 publications

A pragmatic review paper on the use of recycled aggregates in concrete

A pragmatic review paper on the use of recycled aggregates in concrete

Stabilization of Recycled Concrete Aggregate Using High Calcium Fly Ash Geopolymer as Pavement Base Material

Evaluación de una mezcla asfáltica con incorporación de agregados reciclados de concreto tratados superficialmente con una solución química de sulfato de magnesio

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