water absorption of recycled concrete aggregate

Strength and Durability Evaluation of Recycled Aggregate

May 14, 2015 · In general, concrete made with RA showed less durability due to high pore volume which led to high permeability and water absorption. High water absorption is due to cement paste adhered on the aggregate surface. However, this can be countered by achieving saturated surface dry (SSD) conditions before mixing.

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IMPROVEMENT OF THE COMPRESSIVE STRENGTH AND

The performance of Recycled Aggregate Concrete (RAC) containing UBRHA, in the term of compressive strength, water absorption and ultrasonic pulse velocity has been investigated. In this study the recycled aggregate has been used in various percentages such as 0%, 50% and 100%, and UBRHA prop ortions from 0%, 5%, 10%, 15% and 20%.

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Effects of Recycled Coarse Aggregate Reinforcing Treated by

coarse aggregate performed higher porosity, higher water absorption and lower strength [2]. The fluidity and performance of the recycle concrete were much 

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Recycled Concrete Aggregate - an overview | ScienceDirect Topics

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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Effects of Recycled Aggregate on Concrete Mix and Exposure

Concrete mix with 30% recycled aggregate had the lowest chloride penetration after 2 weeks of saturation and performed better than a concrete mix with 100% natural aggregate. Owing to the lower density and higher water absorption of recycled aggregates, chloride ion diffusion increased with increasing recycled aggregate content beyond 2 weeks. 1.

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A STUDY ON RECYCLED CONCRETE AGGREGATES

abr asion value for recycled aggregate was obtained as 47.4% and that for natural aggregate as 29.6%. Water absorption of recycled aggregate (4.2%) was found to be higher when compared to the natural aggregate (0.4%). It was found that compressive strength of concrete made from the recycled aggregate is about 76% of the strength of concrete

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Mechanical Properties Of Recycled Aggregates Concrete

The amount of absorbed water is proportionally increased with increasing recycled aggregate content. Water absorption depends on the porosity of cement matrix in the new concrete and porosity of cement matrix of the recycled concrete: if recycled aggregate is produced from low porosity waste concrete, water absorption of the new concrete

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Review Article ASSESSMENT OF RECYCLED AGGREGATE

that their greater water absorption can jeopardize the final results. The results of several studies presented in the past have caused the existing codes concerning recycled aggregates for concrete production to strongly limit the use of these products [14–16]. CURRENT KNOWLEDGE BASE ON THE USE OF RECYCLED AGGREGATES IN CONCRETE

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PDF Study of recycled concrete aggregate quality and its

and the mixing procedure (pre-soaking or adding extra water) influence the recycled concrete strength of dif-ferent categories (high or low water to cement ratios). When recycled aggregate absorption is low (under 5%), pre-soaking or adding extra water to avoid loss in workability will negatively affect concrete strength (due to

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concrete with recycled aggregates - Técnico Lisboa

such as density, water absorption or the presence of impurities of the recycled ARC (recycled concrete aggregate): recycled aggregate composed of more 

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use of recycled concrete aggregate in concrete - VGTU Journals

undesirable physical properties of RCA, such as high water absorption that increases water demand for a given workability. However, structural grade concrete  autor: M Safiuddin · ‎2013 · ‎Počet citací tohoto článku: 67 · ‎Související články

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Influence of fine recycled concrete aggregates on the ... - ORBi

Accepted 18 February 2015. Keywords: Fine recycled concrete aggregates. Water absorption. Granular class. Mechanical property. Interfacial transition zone. autor: Z Zhao · ‎2015 · ‎Počet citací tohoto článku: 154 · ‎Související články

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Deterioration of recycled concrete aggregate under the

The water absorption remained largely unchanged for RCA exposed at pH 8, but dropped for RCA exposed at pH 4. After the exposure to water drainage the RCA 

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View of Study of recycled concrete aggregate quality and its

Přejít na Water absorption — In this regard, the water absorption of recycled coarse aggregate varies from 1.12 to 8.82%, with an average value of 5.06%,  autor: I González-Taboada · ‎2016 · ‎Počet citací tohoto článku: 56 · ‎Související články

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Recycled Concrete Aggregate - an overview | ScienceDirect

Recycled Concrete Aggregate. Recycled concrete aggregates (RCAs) are expected to result in an increase in the water absorption of concrete, at a rate directly proportional to the RCA content (Dodds et al., 2017; From: Sustainable Construction Materials, 2019. Related terms: Demolition; Carbonation; Compressive Strength; Interfacial Transition Zone

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Crushed Concrete Aggregates - Properties and Uses of

4. Water Absorption . Water absorption of recycled aggregate is greater than of natural aggregate. It is one of the most significant properties that distinguish recycled aggregate from raw aggregates. Water absorption of recycled aggregate influence both fresh and hardened concrete properties.

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Self-healing concrete with recycled aggregates - ScienceDirect

Jan 01, 2020 · This behavior could be explained by the lower water absorption of the biotreated recycled aggregate, so that greater water quantity could be available in the concrete paste to accelerate the formation of cement hydration products, increasing the compressive strength of the concrete sample at early age.

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Durability of recycled aggregate concrete - Lirias - KU Leuven

difference in water absorption of recycled concrete aggregates and the amount of attached mortar are good indicators to measure this quality. This presentation  autor: M Joseph · ‎2014 · ‎Počet citací tohoto článku: 1 · ‎Související články

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Water Absorption of Aggregate – CivilWeb Spreadsheets

The water absorption of aggregate used for concrete has a significant effect on the required water content of the mix in order to produce concrete which is sufficiently workable in its fresh state and sufficiently strong in its hardened state.

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The Environmental Impact of Recycled Concrete

Water absorption of masonry recycled aggregates, concrete recycled aggregates and the mixtures of two ones must be a maximum of 20%, 10% and 3% respectively in mass of aggregates (Rilem, 1994). Sagoe-Crentsil et al (2001) investigated the relation between fine natural aggregates and coarse

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Recycled aggregates: insertion in prefabricated concrete

That the water-cement ratio is not affected. Replacing the fine fraction (sand or gravel) with recycled aggregates is not advisable, as it can lead to problems with water absorption. The maximum established dose of recycled aggregate in a prefabricated concrete product will vary depending on the type of piece to be made and the aggregate to be

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PDF Water absorption variability of recycled concrete aggregates

Water absorption: % 5.40.77 — 0.75 0.1 NBN EN 1097-6:2006 Table 1. Geometrical and physical properties of aggregates 593 Magazine of Concrete Research Volume 67 Issue 11 Water absorption variability of recycled concrete aggregates Joseph, Boehme, Sierens and Vandewalle Offprint provided courtesy of www.icevirtuallibrary.com

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Aggregate Moisture in Concrete - Concrete Construction

May 31, 2013 · The absorption of the aggregate indicates the quantity of water which will be absorbed into the pore structure. Most commonly, aggregates will have a moisture content that is either below or above this absorption limit. When batching, it is of critical importance to account for this water.

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Influence of aggregates water saturation and accelerated ... - Hal

of water initially absorbed by recycled concrete aggregates. porosity of recycled aggregates leads to higher water absorption, especially during the concrete. autor: JC Souche · ‎2017 · ‎Počet citací tohoto článku: 8 · ‎Související články

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Mechanical and Durability Properties of Concrete Produced

that the properties such as density, water absorption, specific gravity, and crushing value have a negative influence on recy-cled aggregate concrete quality. Grabiec et al.9 concluded that the method of bio-deposition of calcium carbonate improved the quality of recycled aggregate. It led to reduc-tion in the water absorption of RCA.

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