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Recycled Concrete Aggregate an overview ScienceDirect

However, as shown in Chapter 5, there is a greater probability of recycled masonry aggregates (RMAs) showing higher water absorption capacity compared with RCA and thus, for a given replacement level, the former is more likely to produce concrete exhibiting greater permeability and sorptivity than the latter (Soutsos et al., 2011; Gomes and de Brito, 2009; Levy and Helene, 2004, 2007; Poon and

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(PDF) Water absorption variability of recycled concrete

A high water absorption and heterogeneity of recycled aggregate causes difficulties to determine the accurate water from the formulas [32, 33]. Moreover, the water

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Study of Surface Modification of Recycled Aggregate and

Due to most of recycled aggregate (RA) possesses higher water absorption, therefore, the process of mixing recycled aggregate concrete (RAC) is more complex than that of normal aggregate concrete (NAC). In this paper, an organosilicone modifier was used to modify RA to reduce its water absorption. Four mixes of concrete were made up with modified RA at a concentration of 1:1, modified RA at a

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Influence of Water Absorption of the Ceramic Aggregate

2020-11-30  Recy cled aggregate shows higher water absorption and lower density due to the mortar adhered to the recycled aggregate and these ch aracteristics influenced the compressive strength and modulus of elasticity [4]. Due to its pore structure, ceramic aggregate s hows lower water absorption (0.72%) as compared

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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

2015-2-18  2.3. Water absorption Water absorption of recycled aggregate is a characteristic by which this aggregate differs most from the aggregate obtained from natural resources. According to all available research in this area, it has been shown that recycled concrete aggregate has a significantly higher absorption level compared to natural aggregates.

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Study on the Effect of Recycled Coarse Aggregate on the

2021-11-29  The decrease in elastic modulus reduces the constraint of aggregate and increases the shrinkage of green recycled concrete. In addition to this, the higher porosity means that green recycled concrete has a higher water absorption than NAC, which does not help to suppress drying shrinkage.

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Workability study of concretes made with recycled mortar

2013-1-22  Higher water absorption of recycled concrete, in comparison with natural aggregate, is another factor that affects workability. In general, recycled mixtures will show a decrease of the amount of free water [7, 22, 29, 37].

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Internal curing effect of saturated recycled fine

2020-4-1  Recycled fine aggregate (RFA) has larger quantities of hydrated cement paste on its surface than recycled coarse aggregate, and its water absorption is between 6% and 13% [6,7], which is higher than that of natural sand.

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Study of Surface Modification of Recycled Aggregate and

Due to most of recycled aggregate (RA) possesses higher water absorption, therefore, the process of mixing recycled aggregate concrete (RAC) is more complex than that of normal aggregate concrete (NAC). In this paper, an organosilicone modifier was used to modify RA to reduce its water absorption. Four mixes of concrete were made up with modified RA at a

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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

2015-2-18  2.3. Water absorption Water absorption of recycled aggregate is a characteristic by which this aggregate differs most from the aggregate obtained from natural resources. According to all available research in this area, it has been shown that recycled concrete aggregate has a significantly higher absorption level compared to natural aggregates.

get price

Influence of Water Absorption of the Ceramic Aggregate

2020-11-30  Recy cled aggregate shows higher water absorption and lower density due to the mortar adhered to the recycled aggregate and these ch aracteristics influenced the compressive strength and modulus of elasticity [4]. Due to its pore structure, ceramic aggregate s hows lower water absorption (0.72%) as compared

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ASSESSMENT OF RECYCLED CONCRETE AGGREGATE

2019-4-21  manifest higher water absorption compared to NAs. Many researchers concluded that the porous nature of this residual paste is the main reason behind this behavior [18]. The quantity of water available in the concrete mix is influenced

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Strength and durability of recycled aggregate concrete

2012-2-2  most significant difference between recycled aggregate and virgin aggregate is the markedly higher water absorption of the recycled aggregate. Tavakoli and Soroushian [10] found that the water absorption capacity of recycled aggregate reflects on the amount of cement paste adhering to the surface of the aggregate particles.

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Use of Recycled Concrete Aggregate in PCCP: Literature

2019-1-14  Recycled concrete aggregate is angular with rough surfaces, has higher water absorption capacity, lower specific gravity, higher Los Angeles abrasion loss, often fails the sulfate soundness test, but usually passes the magnesium soundness test, and may have higher levels

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Recycled Concrete Aggregates: A Review International

2013-3-29  NA generally has low water absorption due to low porosity, but the adhered mortar on RCA has greater porosity which allows the aggregate to hold more water in its pores than NA. Shayan and Xu ( 2003 ) found water absorption values of 0.5–1 % for NA and 4–4.7 % for RCA in the saturated surface dry condition, up to a 4.2 % difference.

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Recycled Concrete Aggregates Its Uses, Properties

2020-8-18  The recycled concrete aggregate generally meets all the standard requirements of aggregate used in concrete. Water Absorption. Water absorption of recycled concrete aggregate is greater than of natural aggregate. It is one of the most significant properties that distinguish recycled concrete aggregate from raw aggregates.

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Modification of recycled aggregate by spraying colloidal

2021-11-16  In this study, modification methods of recycled coarse aggregate (RCA), namely spraying colloidal nano silica (NS) and silica fume (SF) on the surface of RCA, were adopted to enhance the performance of recycled aggregate concrete (RAC). In the RCA modification methods, colloidal NS with different particle sizes (12 nm, 54 nm and 106 nm) and colloidal SF

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Influence of silica fume on mechanical and physical

2020-4-10  Recycled aggregate is more absorptive than natural aggre-gate and one of the marked physical differences between recy-cled and natural aggregate is higher water absorption rate. The higher water absorption of the recycled aggregate results from the higher absorption rate of cement mortar attached to the aggregate particles.

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Study of Surface Modification of Recycled Aggregate and

Due to most of recycled aggregate (RA) possesses higher water absorption, therefore, the process of mixing recycled aggregate concrete (RAC) is more complex than that of normal aggregate concrete (NAC). In this paper, an organosilicone modifier was used to modify RA to reduce its water absorption. Four mixes of concrete were made up with modified RA at a

get price

Influence of Water Absorption of the Ceramic Aggregate

2020-11-30  Recy cled aggregate shows higher water absorption and lower density due to the mortar adhered to the recycled aggregate and these ch aracteristics influenced the compressive strength and modulus of elasticity [4]. Due to its pore structure, ceramic aggregate s hows lower water absorption (0.72%) as compared

get price

ASSESSMENT OF RECYCLED CONCRETE AGGREGATE

2019-4-21  manifest higher water absorption compared to NAs. Many researchers concluded that the porous nature of this residual paste is the main reason behind this behavior [18]. The quantity of water available in the concrete mix is influenced

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Assessment of Recycled Aggregate Concrete

2018-12-14  water absorption percentage for the three sizes of RA is below 5%, this shows that RA can be used in any construction application. This is complying with BS 882:1992, which states a 10% maximum value of water absorption for coarse aggregate. Aggregate with water absorption this value can use for the application in structural element, non structural

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PROCESSING AND PROPERTIES OF RECYCLED

properties are well-known factors of recycled aggregate concrete(RAC): a lower density, elastic modulus, strength and a higher water absorption capacity. Due to the fact that recycled aggregate has a proportional mortar which attached to aggregate, it gives a higher porosity and a lower strength to RAC than the normal concrete.

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Surface Absorption Modifier and Application Technology

2016-1-18  • Recycled aggregate from the demolished waste has been proposed for concrete production. However, the quality of concrete make from the recycled aggregate is difficult to control. Two key drawbacks are (a) the higher water absorption of the recycled aggregate than the norma l aggregate (b) the inconsistence of water absorption between

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Effects of Using Recycled Concrete as Aggregate on

2017-5-18  higher water absorption and higher Los Angeles abrasion percentage. In this study, Los Angeles abrasion loss value was found as 22.4 % for recycled aggregates (16-32 mm) obtained from high strength standard concrete, while this value was found as 41.4 % for recycled aggregates (4-8 mm) obtained from low strength standard concrete [3].

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Use of Recycled Concrete Aggregate in PCCP: Literature

2019-1-14  Recycled concrete aggregate is angular with rough surfaces, has higher water absorption capacity, lower specific gravity, higher Los Angeles abrasion loss, often fails the sulfate soundness test, but usually passes the magnesium soundness test, and may have higher levels

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A STUDY ON THE PARTIAL REPLACEMENT OF RECYCLED

2020-12-31  recycled concrete debris, the increased porosity of aggregates generally results in a considerably higher water absorption which affects the „„free‟‟ water i.e., the water available for the chemical reactions and, consequently, the actual water– cement ratio. Therefore, this higher porosity plays a key role on the

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Influence of silica fume on mechanical and physical

2020-4-10  Recycled aggregate is more absorptive than natural aggre-gate and one of the marked physical differences between recy-cled and natural aggregate is higher water absorption rate. The higher water absorption of the recycled aggregate results from the higher absorption rate of cement mortar attached to the aggregate particles.

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