Influence of the incorporation of recycled coarse ...

The mix proportion of RAC was designed with two water-to-binder ratios of 0.33 and 0.39, and the sand ratio was set as 40%. Before mixing, the RCAs due to higher water absorption was preconditioned to reach the saturated surface-dried state and the additional water absorbed by RCAs couldn't be ignored , , .However, this part of additional water was not included in the calculation of the ...

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Reuse of Improved Recycled Concrete Aggregates (RCA) for ...

Treated RCAs have lower water absorption and lower cement mortar adhesion. These RCAs that have been used as aggregates in new concrete, increased the ... autor: AS Alyaseen · ‎2020

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Compressive Strength and Capillary Water Absorption of ...

capillary water absorption, and density tests conducted on concrete containing recycled aggregate (RCA) which is obtained from structural waste generated by the construction industry in Turkey. In the experiments, 0%, 15%, 30%, 45% and 60% of the normal (natural) coarse aggregate was replaced by the recycled aggregate.

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water absorption of recycled concrete aggregate

Water absorption variability of recycled concrete aggregates Article (PDF Available) in Magazine of Concrete Research 67(11):592-597 · June 2015 with 1,182 ...

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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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Estimation of Recycled Concrete Aggregate’s Water ...

During one day of carrying, the water absorption by RCA increased by 2.56% , which is important for the permeability parameters of this material. Recycled aggregates used in earth constructions are usually cheaper than the natural aggregates. Re-use of construction waste is an environmentally friendly solution.

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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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Using fine recycled concrete aggregate for mortar production

8. 10. 2013 — The compressive and flexural strength, water absorption by ... Keywords: concrete waste, recycled aggregates, coating mortars, performance ... autor: C Neno · ‎2014 · ‎Počet citací tohoto článku: 115 · ‎Související články

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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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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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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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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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Evaluation of concrete made with coarse recycled aggregate ...

Recycled concrete aggregate. (RCA) from concrete waste. ▫Some of the problems to use RCA is. ▫ its higher water absorption. ▫ and its lower specific mass.

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Modified pycnometer method to measure the water absorption ...

Jan 27, 2020 · The water absorption of crushed concrete aggregates (CCA) has a major influence on concrete workability. In order to determine the water absorption of CCA, a more porous material than natural aggregates, modifications to the standard pycnometer method are proposed as: (1) Water absorption is measured on a combined fraction CCA consisting of fine and coarse aggregates …

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(PDF) Cement paste content and water absorption of recycled ...

To avoid variation of concrete consistency, several studies proposed to immerse recycled aggregates in water during 10 min to obtain a complete saturation state [35,36], which enables to avoid the ...

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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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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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Recycled aggregate concrete (RAC) – comparative analysis ...

Based on existing norms and specifications that allow the use of recycled aggregates in the production of concrete, a comparison is made of the parameters involved, such as density, water absorption and contaminants ratio within the recycled aggregates and maximum strength allowed for the recycled aggregate concrete, among others.

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Mechanical Properties of Recycled Aggregate Concrete at ...

This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA made ...

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Performance Of Polymer Treated Recycled Concrete ...

aggregate by improving its water absorption by treatment with polymer. Hardened concrete properties of recycled concrete aggregates for M30 and M40 grade ...

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Water absorption limits on aggregates - The Concrete Society

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 of the limits but the following may be of interest.

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Examining the Variability of Recycled Concrete Aggregate ...

Properties included in the experimental work are variability in aggregate size (20 mm and. 10 mm), shape and texture, gradation, specific gravity, water absorption, ... autor: S Yehia · ‎Počet citací tohoto článku: 6 · ‎Související články

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Water absorption variability of recycled concrete aggregates ...

Recycled concrete from building demolition is a heterogeneous material, resulting in a higher standard deviation of many properties of CRCA. One of the important properties of CRCA, needed to design concrete mixes, is water absorption, but the heterogeneous nature of CRCA makes it harder to predict the actual amount of water that will be ...

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Experimental Study on the Influence of Water Absorption of ...

Apr 04, 2015 · In this paper, three recycled coarse aggregates (RCAs) with different 24-h water absorptions (5.67, 3.12, and 1.98 wt%) were used to produce recycled coarse aggregate concretes (RCACs). Different water absorption rates were obtained by modifying the surface of RCAs with low and high concentration of alkaline organosilicone modifier that is ...

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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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Cement paste content and water absorption of recycled ...

Jul 03, 2013 · In this paper, we first show that the amount of residual cement paste in recycled concrete aggregates (RCA) depends on the initial paste content, on the mechanical properties of the initial cement paste and on the mechanical quality of the transition zone at the interface between the initial natural aggregates and cement paste. Our results suggest that water absorption of RCA at 24 h can ...

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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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Measuring the water absorption of recycled aggregates, what ...

1. 10. 2016 — This standard procedure suggests immersing the concrete pieces in water, boiling the material for 5 h, and then cooling them, naturally, for 14 h ...

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Durability of Reinforced Concrete Incorporating Recycled ...

Therefore, replacement of fine aggregates with recycled concrete results in higher water absorption and water-cement ratio of concrete than for natural fine ... autor: R Movassaghi · ‎2006 · ‎Počet citací tohoto článku: 47 · ‎Související články

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Influence of hardened cement paste content on the water ...

(2013). Influence of hardened cement paste content on the water absorption of fine recycled concrete aggregates. Journal of Sustainable Cement-Based Materials: Vol. 2, No. 3-4, pp. 186-203.

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