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Investigation of Adhered Mortar Content on Recycled

Investigation of Adhered Mortar Content on Recycled

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Further, the actual adhered mortar content was also studied by the heating and cooling method. Then, the effect of recycled aggregate size on the percentage of adhered mortar, and the characteristic of recycled aggregate was explored by IAM. In addition, the type and optimal size of recycled aggregate were also investigated.

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Investigation of Adhered Mortar Content on Recycled ...

Jun 28, 2021  The obtained data indicated that IAM is an accurate and efficient method to measure the proportion of adhered mortar or other phases; the highest content of adhered mortar was found in recycled aggregate with a size of 10.0–16.0 mm, up to 39.39%; the percentage of the recycled aggregates with a particle size between 16.0 and 20.0 mm should be ...

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Effects of Adhered Mortar Content on Quality of Recycled ...

Although the adhered mortar content affects the properties of recycled aggregate concrete, there are few papers describing those effects. This paper presents the results of a series of experimental study on the effects of adhered mortar content on the quality of recycled coarse aggregate of concrete. 5 kinds recycled coarse aggregates made with heating and rubbing method, mechanical crashing ...

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Jul 01, 2009  3.2.. Laboratory Test Method for the Determination of RMC in RCABased on an extensive laboratory investigation program, Abbas et al. proposed a quick laboratory test method for determining the RMC of RCA. The method, which consists in submitting representative samples of the RCA to a few daily cycles of freezing and thawing in a sodium sulphate solution, can be summarized as follows :

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Jun 01, 2014  This paper presents the experimental results of a study on comparing the difference in properties of recycled aggregates (RAs) with varying amounts of old adhered mortar obtained from different sources and evaluating the influence of the different RAs on the mechanical and durability properties of recycled aggregate concrete (RAC).Four concrete mixes (one with natural aggregate

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Jul 07, 2021  This experimental investigation could provide a basis and reference for microwave-assisted concrete recycling for industrial applications. ... Investigation of Adhered Mortar Content on Recycled Aggregate Using Image Analysis Method. Journal of Materials in Civil Engineering June 2021 .

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Effects of Adhered Mortar Content on Quality of Recycled ...

Since the adhered mortar is porous, water absorption of recycled concrete aggregate is considerably higher and can widely range from 3% to 10% as compared to 1-5% for virgin aggregate [15,16].

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Experimental Investigation of Recycle Concrete Aggregate

Experimental Investigation of Recycle Concrete Aggregate ... surface of the recycled aggregate. This attached mortar results in higher porosity, higher water absorption rates, and thus a ... adhered mortar in RA in enhancing the abrasion value is only 15% approximately (45–29%) and

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Methods for Determination of Residual Mortar Content ...

To study the methods for determination of residual mortar content adhered to recycled aggregate, this paper aims at three methods which are apparent density method, quench hot method and sulfate solution freezing-thawing method. These methods were compared by experiments and their basic principles were also respectively stated. The principles of the latter two methods are similar, which are to ...

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(PDF) EXPERIMENTAL INVESTIGATION OF RECYCLED

This is due to the high absorption capacity and rough Aggregates but From table V, the workability of concrete slump value increase 3.23% to 5.88% by PSTSMA, In the first stage the slurry formed fills the adhered mortar pore of recycled aggregate and in the 2 nd stage amount of water provided full fill for the fluidity of concrete, which ...

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FAILURE PROBABILITY OF CONCRETE MADE WITH RECYCLED ...

The paper presents results of an investigation conducted to assess the probability of fatigue failure of concrete in which the Coarse Natural Aggregates (NA) were ... Recycled concrete aggregates offer many technical benefits i.e. processed form of ... lower as the density of adhered mortar is less than the underlying rocks [4]. As reported

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Proposed Method for Determining the Residual Mortar ...

Dec 27, 2007  Volume 5, Issue 1 (January 2008) Proposed Method for Determining the Residual Mortar Content of Recycled Concrete Aggregates (Received 2 March 2007; accepted 27 November 2007)

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Sustainable production of recycled concrete aggregates by ...

Jan 25, 2021  In this investigation, when MRCA was immersed in lime (quicklime) solution, the heat generated due to an exothermic reaction between quicklime and water puffed up the MRCA resulting in the removal of a portion of adhered mortar. The higher the concentration of lime solution was, more was the removal of old mortar.

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Experimental assessment of microwave heating assisted ...

Jun 30, 2021  Acid pre-soaking method was employed to test the adhered mortar percentage of the recycled aggregate. After soaking in acid for 48 h, coarse aggregates were collected by washing the samples. ... where M c is the mortar content, ... Investigation of microwave-assisted concrete recycling using single-particle testing. Miner Eng 31:71–81.

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Green Concrete from Sustainable Recycled Coarse Aggregates ...

Feb 02, 2015  Present investigations deal with the development of green concrete (M 30 grade) using recycled coarse aggregates for sustainable development. Characterization of recycled coarse aggregates showed that physical and mechanical properties are of inferior quality and improvement in properties was observed after washing due to removal of old weak mortar adhered on its surface.

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Simulation of cracking susceptibility in recycled concrete ...

Due to the limited experimental data on the performance of Recycled concrete Aggregate Concrete (RAC) in both compression and tension, a series of finite element simulations were performed on a RAC systems with a range of adhered mortar contents for a regular 100 mm RAC cube.

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International Journal of ChemTech Research

adherence of mortar particles to stone particles. A weak porous and crack layer is formed due to the adhered mortar particles which have a substantial effect on the strength property of recycled aggregate concrete. Some researchers have made investigations on the workability of concrete and reported that the required workability

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Crystals Free Full-Text Use of Recycled Concrete ...

The researchers set the sulfate content of 0.032 g/L and 0.0250 g/L for RCA and NCA, respectively. The sulfate content of RCA depends on the amount of adhered mortar/cement paste. Higher sulfate content in RCA indicates that higher amounts of mortar will attach to RCA.

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Technical Paper Strength, shrinkage and creep of concrete ...

gregate: i.e. strengthen the adhered mortar or remove the adhered mortar. One of the strengthening ap-proach of the adhered mortar is accelerated carbona-tion [8-12]. There have been many studies on the long-term behaviour of recycled aggregate concrete, but very few on the shrinkage and creep behaviour of recycled

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The influences of granite industry waste on concrete ...

The gradation of granite waste (GW) particles replacing fine aggregates is shown in Fig. 1(b). As seen in Fig. 1, grading of coarse aggregate and fine aggregates with 20 % and 30 % GW follows an ASTM C33 standard [] while the 50 % GW sand mostly satisfied the grading limits of ASTM C33, except that the percentage passing from 2.36 mm (No. 8 ASTM).). Since this study aims for the high amount of ...

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Optimal Allowable Residual Mortar Content in Recycled ...

detecting the acceptable amount of adhered mortar on the recycled aggregates without significantly affecting concrete properties. The ultrasonic pulse velocity has been implemented as an indication of concrete quality. The results showed that the type and the amount of the old residual mortar content (RMC) have significant effect on the

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EXPERIMENTAL STUDY ON EFFECTS OF ADHERED MORTAR CONTENT

【Abstract】 Although the adhered mortar conternt affects the properties of recycled aggregate concrete, there are few papers describing those effects.This paper presents the results of a series of experimental study on the effects of adhered mortar content on the quality of recycled coarse aggregates and strengths and durability of concrete.5 kinds of recycled coarse aggregates made ...

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Investigation of Strength and Durability of Steam Curing ...

adhered mortar on RA are not cost effective and of low efficiency to enlarge its practical application in concrete production. Recently, related specification (JIS A5022) on the coarse aggregate has been modified in which L-grade or the lowest grade RA can be used mixing with natural coarse aggregate for recycled aggregate concrete (RAC).

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International Journal of ChemTech Research

increase the weight of the aggregate. Finally the continued expansion of adhered mortar leads to peeling off of the surface layer of adhered mortar. The experimental results clearly indicated that considerable amount of mortar content was removed by the acid soaking treatment and the properties of recycled aggregates were improved after treatment.

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Technical Paper Strength, shrinkage and creep of concrete ...

gregate: i.e. strengthen the adhered mortar or remove the adhered mortar. One of the strengthening ap-proach of the adhered mortar is accelerated carbona-tion [8-12]. There have been many studies on the long-term behaviour of recycled aggregate concrete, but very few on the shrinkage and creep behaviour of recycled

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Improving Recycled Aggregate Quality by Mechanical Pre ...

Sep 29, 2020  CCA for 10 and 15 min respectively. Results show, adhered mortar content and CCA water absorption reduces as pre-processing duration increases. Pre-processing influences CCA particle grading, flakiness index, shape index, void-content, unit-weight and density, jointly seen as packing density, which increases with pre-processing duration.

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Fresh and hardened properties of self-compacting concrete ...

In this paper, an experimental study was undertaken to improve the fresh and hardened characteristics of normal (NS) and high strength (HS) self-compacting concrete (SCC) mixes made with recycled aggregate (RA). An easy-to-perform treatment method was proposed to enhance RA properties: in this method, RA was first subjected to partial removal of adhered mortar, then treated with polyvinyl ...

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INFLUENCE OF ACID TREATMENT AND IVA DESPOTOVIĆ

coefficient and fine particles content [7]. The strength of the original concrete, the crushing process and the particle size of RCA have a significant impact on the quantity of old adhered mortar, which may reach 20– -70% by weight of RCA [8,9]. This is important, since the quality and the amount of adhered mortar

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Microstructure of Recycled Aggregate Concrete SpringerLink

Jun 17, 2018  Particularly, this is very important in RAC, as the recycled aggregate concrete has more interfaces than normal concrete, i.e., the interfacial transition zone between the original aggregate and the adhered mortar (old ITZ), and another interface between the adhered mortar and new mortar matrix (new ITZ) in recycled aggregate concrete.

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Influence of acid treatment and carbonation on the ...

Recycled concrete aggregate (RCA), obtained by crushing of original (old) concrete, consists of natural aggregate grains and a cement mortar matrix. The presence of old adhered cement mortar, which has higher porosity than natural aggregate, causes unfavourable properties of RCA.

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(PDF) Evaluating the Carbonation Resistance of Self ...

The old or adhered mortar/aggregate is attached to new mortar/aggregate through boundary which is known as Interfacial Transition Zone (ITZ). The RCA comprises of two ITZs i.e. one between the RCA and new mortar, and the other between the RCA and the old mortar attached to it (old ITZ).

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Crystals Free Full-Text Use of Recycled Concrete ...

The researchers set the sulfate content of 0.032 g/L and 0.0250 g/L for RCA and NCA, respectively. The sulfate content of RCA depends on the amount of adhered mortar/cement paste. Higher sulfate content in RCA indicates that higher amounts of mortar will attach to RCA.

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Understanding variability in recycled aggregate concrete ...

Abstract This paper investigates the effects of adhered mortar content on the mechanical properties of recycled aggregate concrete (RAC) systems using two-dimensional finite element analysis of RAC specimens subjected to uniaxial compression. Sensitivity and statistical analyses of RAC systems were conducted to explore how individual material stiffnesses (aggregate, mortar matrix, adhered ...

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Rutting Resistance of Hot Mix Asphalt Containing Coarse ...

Jun 22, 2021  The use of recycled concrete aggregate (RCA) as a part of coarse aggregates in asphalt pavements confers economic and environmental benefits. Coarse RCA (CRCA) has inferior mechanical and physical properties compared to natural aggregates due to very porous and weakly adhered cement mortar. In this study, CRCA surfaces were coated with waste plastic bottles (WPB) and used at

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