typical absorption of recycled concrete
The effect of water absorption distribution of recycled …
High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with recycled coarse aggregate. Extensive attention has been paid to the mean value of the water absorption of recycled coarse aggregate, but not …
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Engineering Behavior of Concrete with Recycled Aggregate
The physical properties of RCA mainly determine on water absorption, adhered mortar quality, amount of adhered mortar, contaminant, chemical constituent and the interfacial …
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A comprehensive review on the use of recycled concrete …
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs.
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Mechanical Properties of Concrete Blocks Incorporating Recycled …
As PA aggregate content increased, the water absorption of the PA concrete blocks increased significantly to 6.75, 9.04, 10.60 and 12.18% of the typical concrete blocks when the PET ratio is 10%, 25%, 50% and 75%, respectively. Interestingly, a 5% substitution of natural sand with PA aggregate reduced the water absorption of …
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Strength, Porosity and Permeability Properties of …
Mix design for the control concrete group and the recycled concrete aggregate replaced concrete group were determined per the A.C.I. 522R, 2010 design standard. Cube molds with dimensions of 150 …
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Physical performance, durability, and carbon emissions of …
The first stage capillary absorption stage of recycled cement concrete is faster than that of ordinary concrete, and then it also enters the slow second absorption stage. …
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Water absorption of fine recycled aggregates: effective determination
The high absorption of fine recycled aggregates is indicated as the main difference with respect to fine natural aggregates. This property determines the extra amount of water to be added during mixing to avoid a loss in workability when these aggregates are used for making concrete. Although several methods have been …
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Water absorption variability of recycled …
High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with ...
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The impact of original aggregate and attached mortar types of recycled …
Recycled concrete aggregate (RA) is composed of original aggregate and attached mortar, both of which are essential in determining the durability and mechanical characteristics of recycled concrete. ... Natural river sand, characterized by a fineness modulus of 2.46, an apparent density of 2586 kg/m 3, and a water absorption rate of …
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Water absorption of recycled aggregates: …
Recycled Concrete Aggregates are highly porous and may therefore absorb more water than natural aggregates. Several methods allow for the measurement of water absorption requiring drying at...
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Assessing benefits of pre-soaked recycled concrete aggregate …
Coarse recycled concrete aggregate (RCA) is a variable material, and that variability can often make it less desirable for usage in concrete infrastructure. ... For reference, the Cement Association of Canada states that the typical absorption capacity range for coarse concrete aggregate is 0.2–4%, and 0.2–2.0% for fine concrete …
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Evaluation of recycled concrete aggregate in asphalt mixes
This paper investigates the feasibility of using recycled concrete aggregate (RCA) as a replacement to the natural aggregates (NAs) in hot mix asphalt (HMA). RCA was collected from two different sources (new concrete cubes used for quality control testing during construction, and old demolished building) to investigate the impact of …
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Materials | Free Full-Text | Modification of Recycled Concrete …
The differences in physical properties, chemical properties, and mechanical properties between reclaimed concrete aggregate and natural aggregate are discussed in this paper. In this paper, the commonly used improvement techniques of recycled concrete aggregate are reviewed. Physical modification involves peeling the attached …
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Capillary Water Absorption Performance and Damage …
DOI: 10.2139/ssrn.4184139 Corpus ID: 251486395; Capillary Water Absorption Performance and Damage Constitutive Model of Recycled Concrete Under Freeze-Thaw Action @article{Xiao2022CapillaryWA, title={Capillary Water Absorption Performance and Damage Constitutive Model of Recycled Concrete Under Freeze …
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Cement paste content and water absorption of recycled …
absorption rate and water absorption capacity at 24 h. Keywords Waste management Aggregate Absorption Recycled concrete Workability 1 Introduction Concrete is the most used building material in the construction industry. Its world production is esti-mated to be about 6 billions tons/year [1]. On one hand, this predominant market position
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Studying the usability of recycled aggregate to produce new concrete …
Mixing and specimen preparation. Table 2 displays the quantities of each element, namely cement, fine aggregate, coarse aggregate, and recycled coarse aggregate. Moreover, Table 2 accurately computed the optimal blend ratios for casting each design, using the specified amounts of constituents in cubic meters. The concrete …
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Cement paste content and water absorption of recycled …
Our results suggest that water absorption of RCA at 24 h can be seen as the simple sum of the capillary absorption of both residual cement paste and initial natural …
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Recycled Concrete Aggregate
Learn about recycled concrete aggregate (RCA), a new type of concrete produced using crushed, screened, and washed recycled aggregate from waste concrete. Find …
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Evaluation of the physical and mechanical properties of concrete …
Within the methodology employed, five types of samples with recycled concrete at proportions of 10%, 20%, 30%, and 40% by weight of coarse aggregate were prepared, and physical and mechanical properties were evaluated at 7, 14, and 28 days. ... This decrease is due to the fact that the absorption capacity of RCA decreases the …
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Performance of concrete made with commercially produced coarse recycled
As widely reported [2], [7], typical reductions of the order of 10% in compressive strength and up to a 70% increase in drying shrinkage are not uncommon. ... Water absorption rates of recycled concrete and reference normal concrete. Reference to Fig. 7 shows that under the curing regime employed, the lower porosity of the basalt …
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Recycled Aggregates for Concrete Production: State-of …
Only the chipping of concrete according to type 1 and type 2 (as defined in the above standard) can be used for concrete production. Type 1 RA can be associated to a RCA: it contains at least 90 % of concrete and natural aggregates, not more than 10 % of clinker, non-pored bricks, sand-lime bricks, less than 2 % of other mineral materials and …
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Saline water absorption behavior and critical saturation degree …
The investigation results indicated that the compressive strength of RAC decreased as the replacement level of recycled aggregate increased, and concrete with different RCA replacement levels performed well in freeze-thaw test [11].The ultrasonic pulse velocity, water absorption and freeze-thaw resistance of concrete with its …
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Engineering Behavior of Concrete with Recycled …
waste remarkably claim environmental threat. In this paper, the engineering behavior, durability, and concrete microstructure of recycled concrete aggregates (RCA) on short-term concrete properties were investigated. The studied concrete at design mix proportion of 1:0.55:2.14:2.61 (weight of cement :coarse aggregates :sand :water) used to obtain
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Prediction of properties of recycled aggregate concrete …
Recycled aggregates include coarse recycled aggregates (CRA) with a typical particle size range of 4.75–31.5 mm and fine recycled aggregates (FRA) between 0.16 and 4.75 mm [27]. Since RA obtained from CDW contains hardened cement paste or mortar and the surface of RA is rough, many micro-cracks will be generated during the …
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Performance of pervious concrete influenced by typical …
This work investigated the effects of the crushing index and water absorption of recycled concrete aggregate (RCA) on performance of recycled aggregate pervious concrete (RAPC). It was found that the large RCA water absorption can reduce the cohesiveness between aggregates thereby leading to poor castability of fresh RAPC …
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Mechanical behavior and constitutive relationship of the …
To investigate the effect of classification of recycled coarse aggregate on the mechanical behaviors of recycled aggregate concrete (RAC), a total of 150 RAC testing blocks were designed based on the Chinese standard GB/T 25177-2010, taking recycled coarse aggregate and substitution ratio as factors in a series of tests, including …
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Comparative Study on Natural and Recycled Concrete …
Fresh properties of concrete include workability of concrete mix. It is greatly influenced by a number of parameters, aggregate size, moisture content, water absorption, and aggregate shape and texture [19, 20].Due to the porous nature of RCA, it attains low workability than the natural aggregate.
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New approach in measuring water absorption of recycled …
With the increase in the use of recycled aggregate concrete, the demand on recycled aggregate (RA) is escalating. ... more than 50% of waste deposited in a typical landfill comes from ... develop an alternative methodology to examine water absorption of recycled aggregate named real-time assessment of water absorption (RAWA) in giving …
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Properties and composition of recycled aggregates from construction and
Arising from a systematic, as opposed to narrative, literature review of 236 publications published over a period of 38 years from 1977 to 2014, the paper examines the factors affecting the physical, chemical, mechanical, permeation and compositional properties of recycled aggregates sourced from construction and demolition waste, …
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Water absorption variability of recycled concrete aggregates …
High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with recycled coarse aggregate. ... Magazine of Concrete Research Volume 67 Issue 11 Water absorption variability of recycled concrete aggregates Joseph, …
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