Effect of Recycled Sand Content on Characteristics of Mortars and Concretes

Fuente, Enrique Dapena de la; Alaejos, P.; Lobet, A.; Perez, Daniel J.

doi:10.1061/(asce)mt.1943-5533.0000183

Cited by 101 publications

(49 citation statements)

References 11 publications

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“…8 shows the compressive strength of mortar also of series II with W/C = 0.5 and 0.6. We can first observe that the strength of mortars varies linearly with the replacement ratio of calcareous sand by recycled sand for both water to cement ratios, which confirms results obtained by Dapena et al [24]. The slope of the decrease of the compressive strength for mortars made with W/C = 0.5 is larger than the corresponding mortars realized with W/C = 0.6.…”

Section: Influence Of Replacement Percentage Of Recycled Sandsupporting

confidence: 90%

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Influence of fine recycled concrete aggregates on the properties of mortars

Zhao

Rémond

Damidot

et al. 2015

Construction and Building Materials

239

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h i g h l i g h t sInfluences of saturation state of FRCA on the mortars' properties are studied. Mortars made with dried FRCA present larger slump and better mechanical properties. Compressive strength of mortars decreases quasi linearly with substitution rate. Fraction 0/0.63 mm of FRCA has a worse effect on mechanical properties of mortars. a r t i c l e i n f o b s t r a c tFine recycled concrete aggregates (FRCA) also called recycled sand, having particle sizes smaller than 5 mm, are essentially composed of mortar and hardened cement paste. Therefore they induce a large water demand which makes them hard to recycle into mortar and concrete. In this paper, the properties of mortars containing FRCA have been studied, including fresh properties, mechanical properties and interfacial transition zone (ITZ) microstructure.The influence of saturation state of FRCA (dried or saturated) on the properties of mortars of identical compositions has first been studied. The results showed that the slump of mortars containing dried FRCA is always larger than that of mortars containing saturated FRCA. Indeed, in the case of dried FRCA, the theoretical amount of absorbed water is added at the beginning of mixing leading to a temporary increase of the initial efficient W/C ratio and volume of paste, leading to a better workability before its absorption into FRCA. On the contrary, the absorbed water in saturated FRCA is not readily available and thus cannot contribute to increase the initial efficient W/C ratio. Moreover, the compressive strength of mortars containing dried FRCA is always larger than that of mortars made with saturated FRCA, which is attributed to a thinner interfacial transition zone improving its mechanical properties. The influence of the fraction of recycled sand and of the granular class of recycled sand on the mechanical properties of mortars has then been studied with saturated FRCA. The compressive strength of mortars decreases quasi linearly as the replacement percentage of recycled sand increases. Moreover, it is shown that the finer fraction of recycled sand (0/0.63 mm) has the worse effect on the mechanical properties of mortars.

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Section: Influence Of Replacement Percentage Of Recycled Sandsupporting

confidence: 90%

“…Like concrete, mortar manufactured with FRCA generally present a lower strength and as a consequence a lesser durability than similar mortar composed of natural sand [22][23][24]. Generally, compressive strength of mortar decreases as the content of FRCA increases.…”

Section: Introductionmentioning

confidence: 99%

Influence of fine recycled concrete aggregates on the properties of mortars

Zhao

Rémond

Damidot

et al. 2015

Construction and Building Materials

239

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“…Dapena et al (14) and Vegas et al (15) found no significant differences with replacement ratios below 20% and 25%, respectively. Martínez et al (17) found lower densities in mortars manufactured with RA from CDW.…”

Section: Dry Bulk Density Of 28-day Hardened Mortarmentioning

confidence: 92%

“…Corinaldesi and Moriconi (12) and Corinaldesi (13) concluded that replacement levels up to 100% by weight of natural sand by recycled concrete sand decreases the flexural and compressive strength with respect to the reference mortar, although the masonry assemblages with recycled mortar displayed excellent mechanical behavior. Dapena et al (14) reported that the compressive strength dropped linearly with the percentage of replacement of natural sand by recycled concrete sand. Vegas et al (15) proposed that it is possible to replace, by weight, up to 25% of natural sand with recycled concrete sand without decreasing the mechanical strength, workability and shrinkage in masonry mortar.…”

Section: Introductionmentioning

confidence: 99%

A proposal for the maximum use of recycled concrete sand in masonry mortar design

Ledesma¹,

Jiménez²,

Ayuso³

et al. 2016

Mater. construcc.

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Natural sand mining from rivers and seashores is causing serious environmental problems in many parts of the world, whereas the fine fraction from recycling concrete waste is underutilized as a construction material. The aim of this paper is to determine the maximum replacement level of natural sand by recycled sand in the manufacturing of masonry mortar (M-10). For this purpose, five replacement levels were tested: 0%, 25%, 50%, 75% and 100% by volume. The mixes were made using cement CEM II/BL 32.5 N in a volumetric proportion of cement-to-aggregate of 1:5. A commercial admixture was used at a constant content. The amount of water was variable to achieve a consistency of 175±10 mm. The short-and long-term mortar properties were evaluated. The data were analyzed using a one-way ANOVA. In conclusion, a maximum percentage of 50% recycled concrete sand can be used in an indoor environment. RESUMEN: Propuesta de máximo uso de arena reciclada de hormigón en el diseño de morteros de albañilería.La extracción de arena natural de ríos y costas está provocando graves problemas ambientales en muchas partes del mundo, mientras que la fracción fina de los áridos reciclados de residuos de hormigón está infrautilizada como material de construcción. El objetivo de este artículo es determinar el máximo porcentaje de sustitución de arena natural por arena reciclada en la fabricación de morteros M-10. Cinco niveles de sustitución en volumen fueron ensayados: 0%, 25%, 50%, 75% y 100%. Las mezclas fueron hechas con cemento CEM II/BL 32,5 N en una relación volumétrica cemento-árido de 1:5. Se utilizó un aditivo comercial a dosis constante. El agua se ajustó experimentalmente para conseguir una consistencia de 175±10 mm. Se evaluaron las propiedades de los morteros a corto y largo plazo. Los datos se analizaron mediante una ANOVA-simple. En conclusión, un porcentaje máximo del 50% de arena reciclada de hormigón puede usarse en interiores.

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“…This is caused by higher water absorption of RFA itself compared to NFA observed in this study. The RFA also has higher particle surface area due to adherence of old mortars on it for equal volume of aggregates [10]. High water absorption values also indicate higher porosity of concrete which is caused by the porous recycled aggregate itself as well as porous C-S-H structure due to inadequate free water content.…”

Section: Water Absorptionmentioning

confidence: 99%

Properties of Concrete Containing Recycled Fine Aggregate and Fly Ash

Shaikh¹

2014

j solid waste technol mngmnt

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Synopsis: This paper reports the properties of concrete containing recycled fine aggregate (RFA) and fly ash (FA) obtained from local source in Perth, Western Australia (WA). This study is consisted of two parts. In the first part, the properties of concrete containing 25, 50, 75 and 100% (by wt.) replacement of natural fine aggregate (NFA) with RFA are considered. In the second part, the effect of class F fly ash as partial replacement of cement on the properties of recycled concretes containing 25% and 50% RFA are evaluated. The fly ash is used as 30% and 40% replacement of cement. The properties of concrete evaluated are the compressive strength, indirect tensile strength, flexural strength and water absorption. All properties are measured at 7, 28 and 56 days. The results show that, better compressive, tensile and flexural strength of concrete can be obtained in recycled aggregate concretes containing upto 50% RFA as partial replacement of NFA. However, in the case of recycled aggregate concretes containing 30% and 40% fly ash the compressive strength is increase at 56 days and both compressive strength and tensile strengths are decreased at early ages. The flexural strength is increased in recycled aggregate concrete containing fly ash. It is observed that the water absorption is increased as RFA content increased. It is also observed that the water absorption is decreased significantly in recycled aggregate concretes containing fly ash at 56 days.

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Effect of Recycled Sand Content on Characteristics of Mortars and Concretes

Cited by 101 publications

References 11 publications

Influence of fine recycled concrete aggregates on the properties of mortars

Influence of fine recycled concrete aggregates on the properties of mortars

A proposal for the maximum use of recycled concrete sand in masonry mortar design

Properties of Concrete Containing Recycled Fine Aggregate and Fly Ash

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