recycled aggregate higher water absorption

Recycled Aggregate Higher Water Absorption

Recycled Aggregate - an overview | ScienceDirect Topics

As the recycled aggregates present have a higher water absorption capacity, a higher content of fine materials, and a rougher surface (larger surface area), the water content of the mixture needs to be modified in order to obtain matrices with the same consistencies of those determined when using natural aggregates 78,79.

Recycled Concrete Aggregate - an overview | ScienceDirect ...

However, the use of fine RCA below 2 mm is uncommon in recycled aggregate concrete because of the high water demand of the fine material smaller than 150 μm, which lowers the strength and increases the concrete shrinkage significantly. This high water absorption and high cohesion of fine RCA also makes concrete quality control very difficult.

Use of RECYCLED AGGREGATES In CONCRETE- A Paradigm Shift

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% than natural aggregate concrete. The variation also depends on the original concrete from which the aggregates ...

Water absorption variability of recycled concrete aggregates

density is 30 kg/m3 below the theoretical value for higher water adsorption values. Comparing the fresh density curves with the theoretical data shows an intersection near x ¼ 5.4%, the average water absorption of the aggregates used in mixture M3. This means 2 Magazine of Concrete Research Water absorption variability of recycled concrete ...

Water absorption limits on aggregates

Water absorption limits on aggregates. Limits on aggregate water absorption are rare though they may be useful to link to an undesirable concrete property, such as freeze-thaw susceptibility, as water absorption is easily determined. Historically it is not known the source …

Water Absorption Study in Recycled Aggregates for Use as ...

Stone had the higher densities than other mixes and water absorption value of 100% RCA was about 40% higher than 50% RCA + 50% RAP in 31.5 mm - 4 mm fraction. Keywords Water Absorption, Recycled Aggregate, Reclaimed Asphalt Pavement, Density, Subbase Subject Areas: Civil Engineering, Environmental Sciences *.Corresponding author

Crushed Concrete Aggregates - Properties and Uses of ...

Water absorption of recycled aggregate influence both fresh and hardened concrete properties. Recycled sand will be avoided, due to its absorption capacity, which would no doubt produce a shrinkage effect. Workability of recycled aggregate concretes is affected by the absorption capacity of …

Permeability properties of fine recycled aggregate concrete

Permeability properties of fine recycled aggregate concrete Luís Evangelista1,3, Jorge de Brito1,4 ... • The higher porosity and the higher w/c ratio are the main causes for this. 10.00 11.00 12.00 13.00 14.00 15.00 ... - Water absorption by capillarity is influenced by the presence of FRA and by the

Influence of Water Absorption of the Ceramic Aggregate on ...

Reduction of slump was 5.3% when recycled ceramic aggregate was used at a replacement level of 25% and its water absorption was 0.55%, which was higher than that of natural aggregate at 0.23% [2]. Compressive strength of concrete made with ceramic insulator and glass concrete was 16% and 26.34% lower as compared to the conventional concrete [3].

Water absorption variability of recycled concrete aggregates

Water absorption variability of recycled concrete aggregates Article (PDF Available) in Magazine of Concrete Research 67(11):592-597 · June 2015 with 1,145 Reads How we measure reads

New approach in measuring water absorption of recycled ...

To control the high absorption of recycled aggregate, three different mixing methods are also used in each studied concrete: M1 (dry aggregate and extra water), M2 (pre-soaked aggregate) and M3 ...

Strength and Durability Evaluation of Recycled Aggregate ...

May 14, 2015 · More water is needed to achieve similar workability to that of NAC due to higher absorption capacity of recycled aggregate which can be attributed to the presence of impurities and attached cement hydrates.

Prediction Adequacy of Creep of Recycled Concrete ...

A recycled concrete aggregate (RCA) has much higher water absorption content compared to a natural aggregate and could significantly influence the creep properties and durability of concrete. This article investigates the influence of RCA and its water absorption content on the creep properties of concrete and develops a model to predict the ...

Mechanical and Physical Properties of Polyester Polymer ...

Aug 27, 2014 · A better mechanical behavior of RBA aggregate was reported, even though it had higher water absorption, compared with RLA aggregate. The effect of adding higher amounts of unsaturated polyester resin, to the PC made with recycled basaltic aggregates, caused a general increase of the mechanical strengths and stiffening.

Strength and durability of recycled aggregate concrete ...

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.

Water Absorption Study in Recycled Aggregates for Use as ...

Water absorption properties of recycled materials play an important role in pavement performance. The performance of aggregates changes after absorbing water, then it affects highways layers such as base, subbase, capping. This is why these materials must comply requirements of codes and standards. With regard to the increasing trend of application of recycled aggregates in highways layers ...

Recycled Aggregate Higher Water Absorption

recycled aggregate higher water absorption - torencfan.nl. Recycled concrete aggregate is angular with rough surfaces, has higher water absorption capacity, lower specific gravity, higher Los Angeles abrasion loss, often ... recycled aggregate higher water absorption - bgcatering.nl

Effect of Geopolymer Aggregate on Strength and ...

The lower quality of recycled aggregate concrete, due to higher water absorption, higher porosity, and a weaker ITZ hinders the application of this concrete in higher-grade concrete.11 Other alternatives include lightweight fly ash aggregate which can be manufactured12,13; however, this consumes large amounts of energy in the production stage.

Effects of Recycled Aggregate on Concrete Mix and Exposure ...

(2) Bulk densities of recycled aggregate are lower than natural aggregate, while the moisture content and water absorption of recycled aggregate mixes are higher than those of natural aggregate. (3) The workability of concrete, expressed in terms of slump, varied within the range from 60 to 92 mm, which is acceptable for new concrete.

A New Method to Determine the Density and Water …

A New Method to Determine the Density and Water Absorption of Fine Recycled Aggregates • It is not possible to know how the absorption increases over time since the test only provides the overall/potential water absorption. The amount of water absorbed at the beginning of the test, which is important for the correct dosage of the concrete

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