recycled aggregate higher water absorption

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recycled aggregate higher water absorption

Measuring the water absorption of recycled aggregates ...

2016-10-1  The vacuum saturation method gives higher water absorption values than the standard method in both cases, but the difference is not statistically significant in the case of Mills-Beale . Indeed, the difference depends on the different pressure applied by the authors and possibly also on the level of porosity of the aggregates.

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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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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 by the ability of RCA to absorb water. Joseph et al.

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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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Surface modification of recycled coarse aggregate based

Recycled aggregate (RA) is obtained by physical crushing and sieving process from the parent concrete. Utilizing RA to replace natural aggregate (NA) is an effective approach to resources conservation, ... (Fig. 7b), resulting in the higher water absorption rate on the 7th day. Download :

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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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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 by the ability of RCA to absorb water. Joseph et al.

Read More
HIGH PERFORMANCE CONCRETE USING RECYCLED

2020-9-15  The recycled aggregate HPC has shown two times higher water absorption as compared with natural aggregate HPC. The sorptivity coefficient was 3 times higher for natural aggregate HPC than that of recycled aggregate HPC. The recycled aggregate HPC shown better resistance to acid exposure as compared with natural aggregate HPC.

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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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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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(PDF) Properties of Cementitious Materials with Recycled ...

2021-3-17  The RBA has lower apparent density and higher water absorption than natural aggregate, and RBP with an irregular micro-structure contains high

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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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The Environmental Impact of Recycled Concrete

2012-8-14  6.8%, while water absorption in natural aggregates varies from 0.9 to 1.1%. Katz (2003) investigated the compressive strength of concrete which was crushed to serve as a source of aggregate for new concretes. In the investigation it can be noted that as smaller is the crushed aggregate as higher is the water absorption.

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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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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

Read More
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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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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Experimental Investigation of Recycle Concrete Aggregate

2016-9-16  surface of the recycled aggregate. This attached mortar results in higher porosity, higher water absorption rates, and thus a weaker interfacial zone between new cement mortar and aggregates, weakening the strength and mechanical performance of concrete made from recycled aggregate.

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HIGH PERFORMANCE CONCRETE USING RECYCLED

2020-9-15  The recycled aggregate HPC has shown two times higher water absorption as compared with natural aggregate HPC. The sorptivity coefficient was 3 times higher for natural aggregate HPC than that of recycled aggregate HPC. The recycled aggregate HPC shown better resistance to acid exposure as compared with natural aggregate HPC.

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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 AGGREGATES In CONCRETE- A

2021-11-18  Recycled aggregate posses relatively lower bulk density, crushing and impact values and higher water absorption as compared to natural aggregate. The compressive strength of recycled aggregate concrete is relatively lower up to 15%

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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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Utilisation of Recycled Aggregate as Coarse Aggregate in ...

2019-1-20  Recycled aggregate concrete (RAC) is concrete made from recycled aggregate. It was found that the workability of fresh RAC decreases with an increase in recycled aggregate due to water absorption of mortar adhered to recycled aggregate [6].The strength of RAC is reported to be less by about 10% compared to normal concrete [8,9].

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