recycled aggregate higher water absorption

Effect of Fly Ash on Recycled Aggregate Concrete - NBM & CW

Cho and Yeo (2004) [3] found that, due to the high water absorption of the recycled aggregate, a higher slump loss was observed when compared to that of natural aggregate concrete. Dhir et al. (1999) [4,5] showed that the compressive strength of concrete prepared with 100% coarse and 50% fine recycled aggregates was ...

Influence of granular fraction and origin of recycled ... - Orbi (ULg)

20 Mar 2017 ... recycled sands offered significantly higher cement paste content (higher bound water content) than coarse recycled aggregates. The fine RCA had therefore a higher water absorption coefficient compared to coarser fractions of RCA. The water absorption of finer fraction of RCA could be extrapolated.

Pre-Saturation Technique of the Recycled Aggregates: Solution to ...

1 Sep 2014 ... This standard limits the maximum value of water absorption for recycled aggregates up to 7%. However, the majority of concrete and mixed or ceramic recycled aggregates exceed this value. Recycled aggregates from crushed concrete have a higher percentage of water absorption than natural aggregates ...

Effects of Elevated Temperature on Concrete with Recycled Coarse ...

by Katz [2], that the total water absorption of concrete made with recycled aggregate was about 6.9-. 7.6%, and greater than absorption of the reference concrete of about 3.8-3.9%. The sources of recycled aggregates will determine its water absorption capacity. Table 1. Density and water absorption capacity of recycled ...

Mechanical Properties of Recycled Aggregate Concrete at Low and ...

12 Oct 2013 ... This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. ... Tests were conducted on aggregate to measure water absorption and crushing values and on both RAC and natural aggregate concrete (NAC) to ...

Recycled aggregate in fresh concrete mixes – iAS

Many studies have shown that the material made with recycled aggregates have mechanical properties quite similar to those made with 'regular' aggregates. Nonetheless the materialistic properties of the aggregates do differ. The recycled aggregates are characterized by a high water absorption capacity which can be ...

Influence of recycled concrete aggregates on concrete durability

Abstract. The use of recycled concrete aggregates on the production of structural concrete may decrease its performance with respect to durability due to the high water absorption of this type of aggregates. A similar situation occurs with the use of lightweight aggregates, but a previous study has shown that the durability of ...

Study of recycled concrete aggregate quality and its relationship ...

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 the bleeding effect), whereas with high water absorption this does not occur and both of the aforementioned correcting methods can be accurately employed.

Water absorption variability of recycled concrete aggregates - Lirias

The programme ValReCon20 has demonstrated the possibility of replacing up to 100% of coarse aggregates with coarse recycled concrete aggregates (CRCA) in concrete of strength class C25/30. Recycled concrete from building demolition is a heterogeneous material, resulting in a higher standard deviation of ...

Influence of granular fraction and origin of recycled concrete ...

Real RCA from recycling plant were also used for comparison. The results showed that recycled sands offered significantly higher cement paste content (higher bound water content) than coarse recycled aggregates. The fine RCA had therefore a higher water absorption coefficient compared to coarser fractions of RCA.

ANNEX 15 Recommendations for using recycled concrete

Code with an absorption of water no greater than 5%. As a first check in a production plant, to estimate the water absorption of recycled aggregates, an absorption test may be carried out after 10 minutes that should be less than. 5.5% for recycled aggregate applications no greater than 20%. In the case of concrete exposed ...

A new method to determine the density and water absorption of fine ...

21 May 2013 ... One of the properties that most distinguishes fine recycled aggregates (FRA) from fine natural aggregates (FNA) is water absorption; this is substantially higher in the former with damaging consequences for the workability, strength and durability of the concrete15-17. Also the fact that FRA have higher ...

Strengths of Recycled Aggregate Concrete Made Using ... - Imcyc

tensile, andfiexural strengths of recycled coarse aggregate concrete and to compare them ... cled aggregate, and the Los Angeles abrasion loss and water absorption of recycled aggregate. These factors also influence the effect of water-cement ... that through proper measures high-quality concrete materials can be pro-.

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

Similar trends were reported even for split tensile strength also [1]. 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 ...

Study on Concrete Containing Recycled Aggregates Immersed in ...

The strength of the concrete for both normal and recycled aggregates has increased after immersed the aggregates in epoxy resin. The percentage of water absorption and the coefficient of water permeability decreased with the increasing of the normal and the recycled aggregates immersed in epoxy resin. Generally the ...

PROPERTIES OF RECYCLED AGGREGATE CONCRETE

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.

Compressive Strength and Capillary Water Absorption of Concrete ...

containing recycled aggregate (RCA) which is obtained from structural waste ... specific gravities of the aggregates were given in Table II. TABLE I. SOME PHYSICAL PROPERTIES OF AGGREGATES. Water. Absorption (%). Abrasion. Ratio (%) .... increased, diameters of capillary voids in concrete have grown large and ...

Experimental Study on the Influence of Water …

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 ...

Experimental Study on CO2 Curing for Enhancement of Recycled ...

process, the physical properties of the recycled aggregate, including water absorption and density were determined. The extent of CO2 curing of the recycled aggregate was quantified by assessing the carbonation percentage of the aggregates. Carbonation resulted in reduction in water absorption values and increase in ...

Durability Indicators in High Absorption Recycled Aggregate Concrete

3 Mar 2015 ... The recycled material was recovered by crushing of concrete rubble and had high absorption values. The results showed that it is possible to achieve good resistance to carbonation and chloride penetration with up to 50% replacement of recycled coarse aggregate for 0.5 water/cement ratio. Finally, new ...

Lightweight Concrete - Construction Industry Council

10 Dec 2010 ... 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 ...

Deterioration of recycled concrete aggregate under the influence of ...

strength, particle density and water absorption set in the Norwegian Guidelines for Road. Construction for use ... 0,04-0,25 % (water soluble). Concerning deterioration from water, no requirements are set or formulated for recycled concrete aggregate. One is advised to keep the applications above ground water table, mostly.

Influence of parent concrete on the properties of recycled aggregate ...

The relatively higher water absorption characteristics of recycled aggregate necessitate careful adjustment in water content in order to obtain the desired workability of RAC and to eliminate variation in water–cement ratio in different mixes. Hence, trial workability tests were conducted on RAC by varying the quantity of ...

Evaluation of concrete made with coarse recycled aggregate from ...

GRADUATE PROGRAM. CIVIL ENGINEERING. Recycled concrete aggregate. (RCA) from concrete waste. ▫Some of the problems to use RCA is. ▫ its higher water absorption. ▫ and its lower specific mass. Concrete waste has a high potential for use as recycled aggregate in structural concrete. 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0. 10.

basis technical properties of recycled aggregate concrete

water absorption was higher compared to NAC because of remains of mortar on its rough surface. Keywords: waste, recycled aggregate concrete (RAC), natural aggregate concrete (NAC), compressive strength, water absorption, freezing and thawing resistance. 1. Introduction. Problem of reuse of rubble from demolition or.

Effect of fine ceramic recycled aggregate (RA) and ... - UPCommons

The results showed that an increase in the percentages of FRA used in the concrete production led to a decrease in density and an increase in water absorption. The mechanical and durability properties of all the concretes produced with fine ceramic recycled aggregates were similar to those of conventional concrete at 28 ...

Residue strength, water absorption and pore size distributions of ...

In this paper, the effects of high temperature exposure of recycled aggregate concretes in terms of residual strengths, capillary water absorption capacity and pore size distribution are discussed. Two mineral admixtures, fly ash (FA) and ground granulated blast furnace (GGBS) were used in the experiment to partially ...

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

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 ...

Strength and Durability Evaluation of Recycled Aggregate Concrete ...

This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength ...

experimental investigations of coarse aggregate recycled concrete

using RCA. Based on the results of the experimental investigation, the RCA can be recommended as structural concrete in limited applications due to its high percentage of water absorption property of RCA. KEY WORDS: concrete, strength, recycled coarse aggregate, compressive strength, modulus of elasticity and.

Performance of Continuously Reinforced Concrete Pavement ...

good pavement performance. The properties of recycled aggregate measured in this study compared with aggregate are consistent with those reported elsewhere: low specific gravity, higher water absorption, sulfate soundness loss, LA abrasion loss, and thermal coefficient. Little variation was observed in the paving ...

concrete made from recycled aggregate - Solaripedia

water absorbing recycled aggregate. The goal of this production method is to reduce the standard deviation of compressive strength by maintaining a constant initial consistency for each concrete mixture while simultaneously controlling the development of rigidity, which can be higher due to the water absorption of the ...

Durability Study for Normal Grade Concrete with Recycle Aggregates

recycled aggregate less than 20% replacement of the natural aggregate in concrete, the effect on the properties of concrete is little. However, when higher level of replacement, the effect becomes noticeable. One obvious effect is high water absorption of recycled aggregates which will affect the control of the free water.

Analysis of the properties of masonry mortars made with recycled ...

was stated that the substitution of 25% of natural sand for recycled fine aggregate would not significantly affect the properties of the mortars. It was also stated that the properties that limit its percentage of utilization are the recycled aggregates' high capacity of water absorption and the high sulphate content (Vegas et al., ...

Recycled aggregate concrete (RAC) methodology for ... - NOPR

In this paper, a methodology for prediction of long-term properties of recycled aggregate concrete is presented, based ... (density and water absorption), primary and recycled, coarse and fine, and alternatively the 7-day compressive strength of concrete made with .... also an increase in water absorption between concrete.

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

The relationship between density, grading and water absorption and its comparison for mixes would be indicating the changes in behaviour of aggregates and future performance of subbase. Laboratory testing showed that 100% Lime Stone had the higher densities than other mixes and water absorption value of 100% ...

Assessment of Recycled Aggregate Concrete

10. Modern Applied Science. 48 reasons for these are because of factors like smooth texture and rounder shape of RA, higher percentage of fine particles and high water absorption (Olorusongo, F.T., 1999). Only one researcher found recycled aggregate concrete has higher compressive strength. He claimed that recycled.

Workability and Compressive Strength of Recycled Concrete Waste ...

Advanced Materials Engineering and Technology III: Workability and Compressive Strength of Recycled Concrete Waste Aggregate Concrete. ... Results show that the workability of RCWA concrete reduce as the content of RCWA increase in the mix as the water absorption of RCWA is higher than the NA. The compressive ...

Experimental Studies on High Strength Concrete by using Recycled ...

resistance test, test for saturated water absorption and porosity. The tests were conducted by replacing the coarse aggregates in high strength concrete mixes by 0, 10, 20, 30, 40 and 50% of recycled coarse aggregates. A 50% replaced mix with reduced w/c ratio was also tested. From the experimental investigation it was ...

Cement paste content and water absorption of recycled concrete ...

Full-text (PDF) | In this paper, we first show that the amount of residual cement paste in recycled concrete aggregates (RCA) depends on the initial paste conte... ... Cement paste content and water absorption of recycled concrete coarse aggregates. Article · September .... detrimental influence of the high water absorption of.

Water absorption limits on aggregates - Concrete Society

According to BS 8007, aggregates should comply with either BS 882 or BS 1047 and have an absorption, as measured in accordance with BS 812-2, generally not greater than 3%. A paper by Anchor et al discusses the then new BS 8007. Regarding aggregate absorption it says “Water absorption of aggregates is retained ...
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