water absorption of recycled concrete aggregate

Water absorption variability of recycled concrete aggregates

The high water absorption capacity of RCA should be taken into account as it can lead to shortage of water in the concrete mix, affecting the rheological properties of the freshly mixed concrete ...

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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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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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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

What is the absorption of recycled aggregate?

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Capillary Water Absorption Characteristics of Recycled ...

Abstract. In order to study the capillary water absorption characteristics of recycled concrete (RAC) with different replacement rates of recycled coarse aggregate (0, 20%, 40%, and 60%) in freeze-thaw environment, the standard test method of measuring the water absorption of hydraulic cement concrete (ASTM C1585-13) was adopted, and the influence mechanism of freeze-thaw cycle and replacement ...

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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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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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Saline water absorption behavior and critical saturation ...

Oct 20, 2020 · That was probably attributed to the much higher water absorption performance of recycled coarse aggregate compared with that of natural coarse aggregate. Additionally, much more small air bubbles was introduced into the RAC concrete specimens due to the old porous mortar layer attached on the outer surface of recycled 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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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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PERMEABILITY PROPERTIES OF FINE RECYCLED AGGREGATE CONCRETE

Considering all this, in this paper the permeability results (water absorption by immersion, capillary water absorption, carbonation, chloride penetration and electrical resistivity) of concretes made with increasing rates of FRA are presented and compared with those from a reference concrete made exclu-sively with natural aggregates.

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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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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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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 and frost heaving of recycled aggregates ...

Jun 03, 2013 · The 100% natural aggregate had the lowest water absorption and highest densities ((a)–(c)) whereas the 100% recycled concrete aggregate had the highest water absorption. In contrast to the above findings, the frost heave potential was found to be much less sensitive to the aggregate type and particle size.

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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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THE IMPROVEMENT OF RECYCLED CONCRETE AGGREGATE A REVIEW PAPER

properties of recycled concrete aggregate such as density and water absorption have improved after HCl treatment as compared to untreated recycled concrete aggregate. Water glass treated aggregates considerably reduce the water absorption providing the minimal value compared to the other treatments applied.

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

Jun 25, 2019 · 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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The Use of Recycled Concrete Aggregates (RCA) for Temporary ...

Recycled aggregate had water absorption of 9.6%. The workability of concrete, as the amount of recycled aggregate was increased, the concrete required more water to maintain adequate consistency. This was attributed to the angular shape and possibly the water absorption of the recycled aggregate.

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(PDF) Water absorption variability of recycled concrete ...

Water absorption variability of recycled concrete aggregates

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Estimation of Water Absorption Capacity of Hardened Concrete ...

Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete. The high water absorption capacity (WA) of recycled aggregate has a negative impact of concrete mix workability and influences the water-cement ratio.

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Modified pycnometer method to measure the water absorption of ...

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 ...

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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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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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Water absorption methods for fine recycled concrete aggregates

recycled concrete aggregates (FRCA) as it constitutes 40-60% of the crushed concrete. If the FRCA is to be recycled in concrete and mortar it is necessary to know the properties of the FRCA to guarantee a sufficient performance of the new concrete, and especially the morphology and water absorption are of major importance.

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Recycled Concrete Aggregates: A Review | SpringerLink

Mar 29, 2013 · recycled concrete aggregate water absorption residual mortar aggregate properties concrete material properties structural performance 1 Introduction After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste.

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Structural concrete with incorporation of coarse recycled ...

concerning the properties of concrete with recycled aggregates analyzed in the present article are briefly described. 2.1 Water absorption Santos et al. [4] tested a reference concrete (RC) and two recycled aggregates concrete (RAC), both with-out NCA and with recycled coarse aggregates (RCA) from concrete mixes with different water/cement

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

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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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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(PDF) Determining the water absorption of recycled ...

The water absorption of aggregates is a key parameter in concrete mix design. As the adhered mortar of recycled aggregates present a long time of saturation (>24 h).

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