Combined Use of Fine and Coarse Recycled Concrete …
This is due to the recycling methods applied, where the use of multiple processing stages increases the amount of paste accumulated in the fine fraction whilst decreasing the attached mortar content in the coarse aggregates . The aggregate quality is generally determined by its SSD and must be considered along with the WA during the …
Production of High-Quality Coarse Recycled …
Production of High-Quality Coarse Recycled Aggregates through a Two-Stage Jigging Process. by. Viviane L. S. Gschwenter. 1, Rejane M. C. Tubino. 1, Weslei …
Experimental assessment of microwave heating assisted aggregate …
Microwave assisted concrete recycling is highlighted by a large number of research groups all over the world due to its potential for significant process benefit. In this paper, systematic experiments are established to study the microwave heating and aggregate recycling of dried and saturated concrete, respectively, investigating the …
Reduction of contaminated concrete waste by recycling aggregate …
Reclaimed coarse aggregate from contaminated concrete could be recycled in concrete [9], because the pulse power technology has proved to produce clean coarse aggregate that completely separated from mortar [10]. ... A method for aggregate recycle process for contaminated concrete is studied to reclaim high quality aggregate. …
Potential use of granite waste sourced from rock
Granite coarse aggregate should be prepared before being used in concrete mixture, and this process may be easier than extracting sand and gravel due to the millions of tonnes of already stored and unused granite waste. ... Permanent deformation behaviour of pavement base and subbase containing recycle concrete …
Properties of recycled aggregate concrete prepared with scattering
The physical properties of different types and sizes coarse aggregate are listed in Table 1, Fig. 2 shows that the surface of recycle aggregate is porous and loose. NA0# and RA0# were mixed gradations with 5–10 mm aggregate of 30% and 10–20 mm aggregate of 70% in mass. The gradations of coarse aggregate are also shown in Fig. 1.
The Process of Manufacturing Aggregate | K&B …
Manufacturing aggregate – the process. Aggregate is essentially a combination of mined materials broken down into numerous sizes for construction implementation. During the process of manufacturing …
Thermomechanical beneficiation of recycled concrete aggregates …
Tuning of beneficiation based on process efficiency and aggregate quality. ... Assessment of recycling process induced damage sensitivity of recycled concrete aggregates. Cem. Concr. ... Separation and Collection of Coarse Aggregate from Waste Concrete by Electric Pulsed Power, in: AIP Conf. Proc., AIP Publishing LLC, 2017: p. …
Recycled Concrete Aggregates: A Review | International …
After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that …
Properties of Recycled Aggregates | SpringerLink
Figure 3.2 shows the grading curves of natural coarse aggregate and recycled coarse aggregates obtained from Source 1 (RCC culvert Medinipur), and it was observed that the recycled coarse aggregates are relatively finer than natural coarse aggregates. Hence, the fineness modulus of recycled coarse aggregate (6.692–6.77) …
Recycled Concrete Aggregate
Recycled concrete aggregates (RCAs) are expected to result in an increase in the water absorption of concrete, at a rate directly proportional to the RCA content (Dodds et al., …
Separation and collection of coarse aggregate from waste …
By using this technique, the quality of the coarse aggregate separated and collected from concrete test specimens is comparable to that of coarse aggregate recycled by heating and grinding methods, thus satisfying the criteria in Japan Industrial Standard (JIS) A 5021 for the oven-dry density and the water absorption of coarse aggregate by ...
Strengths for Recycling as Coarse Aggregate
The coarse aggregates presented in demolished concretes, when correctly liberated by comminution and separated from the remaining material (basically cement paste and sand), may be used as coarse aggregate [11,22] to replace natural aggregates. Some studies of old concrete comminution and recycling are presented in the litera-ture.
Strengths for Recycling as Coarse Aggregate
Coarse Aggregate. Minerals 2021, 11, 803. https://doi/10.3390/ min11080803. Abstract: This paper presents a physical characterization for the recycling into new concretes of …
Impact of Multiple Recycling on the Strength of Coarse …
The chart shows the percentage of ACV for natural aggregate as 22.00% which is increased after every stage of recycling becoming 24.50%, 26.64% and 28.79% for sample 1st, 2ndand 3rdgeneration RCA ...
Recycled Aggregates: What You Need To Know
Essentially, the term refers to materials that have been previously used in construction. A process of reprocessing which consists of crushing and mixing is then required for the aggregates so ensure they meet legal requirements. Benefits of using recycled aggregates: Cost effective. Another appealing aspect of recycled aggregates is …
Eco-friendly concrete with waste ceramic tile as coarse aggregate
The drive towards circular economy in achieving sustainable concrete cannot be overemphasized. The recycling of waste tiles from the ceramic industry, demolished buildings, or during the construction process could be one way of solving the waste generated from ceramic tiles. This study investigates the use of waste ceramic …
Self-compacting concrete with recycled coarse
To sum up, recycling coarse aggregate is a complicated process and its influence on concrete differs depending on the research. Therefore, percentage of replacement of NA with RCA should be supported by the fulfilment of the assumed concrete strength requirements.
Experimental study on recycled coarse aggregate of concrete
For making recycled coarse aggregate, concrete from a nearby site was used in a testing machine and then by hand with hammers. The broken aggregates are then put through 20 mm, 16 mm, 10 mm, and 4.75 mm sieves, and the aggregates that stay in the 16 mm, 10 mm, and 4.75 mm sieves are used as recycled coarse aggregates that …
(PDF) A review on concrete recycling
A review on concrete recycling. Sara Shomal Zadeh 1,, Navid Joushideh, Behrokh Bahrami 1 and Sahel Niyafard 3. 1 Department of Civil and Environmental Engineering, Lamar University, Beaumont, TX ...
Recycled Aggregate
Recycled aggregates (RAs) for asphalt materials. Abbaas I. Kareem, Hamid Nikraz, in Advances in Construction and Demolition Waste Recycling, 2020 Abstract. Inclusion of recycled aggregates (RAs) in asphalt mixtures can reduce the depletion of natural aggregates (NAs) by providing an alternative material for hot-mix asphalt (HMA). Given …
Guidelines for Selection and Use of Coarse Recycled …
This paper presents guidelines for using recycled-concrete aggregate (RCA) as a full or partial replacement for natural coarse aggregate in new concrete (RCA …
Recycling of Concrete (Recycling Coarse Aggregate)
The Specific gravity of cement was 3.2 and the fineness of cement was 4%. Coarse Aggregate: The Coarse aggregate was used as Recycled coarse aggregate (RCA). The specific gravity of the RCA was 2.30. The Fineness modulus was 3.67 Fine Aggregate: Natural river sand was used as fine aggregate.
Recycled Plastics as Coarse Aggregate for Structural Concrete
A healthy and sustainable reuse of plastics offers a host of advantages. The suitability of recycled plastics as coarse aggregate in concrete and its advantages are discussed here. The initial questions arising of the bond strength and the heat of hydration regarding plastic aggregate were solved. Tests were conducted to determine the ...
Property Improvement of Recycled Coarse Aggregate by …
Recycled aggregate (RA) made from waste concrete has inferior fundamental properties, i.e., apparent density, water absorption, mass variation, carbonation ratio, etc., compared to those of natural aggregate (NA), severely restricting its application in practical projects. However, using CO2 to accelerate RA carbonation can effectively improve …
Recycled plastic (HDPE) coarse aggregate manufacturing …
The cumulative percentage pass of the coarse aggregate used according to ASTM C330/c330M [9] and IS 383-2019 as pictured, in 1.18–20 mm specification. ... This proved that the efficiency of the aggregate preparation process is correct. Aggregate made with plastic sand also has a strong bond between sand particle and HDPE plastic …
Evaluation of Surface-Coated Recycled Coarse Aggregate in …
Concrete is a crucial material in the construction industry, but many countries face scarcity in natural resources. To address this issue, recycling materials is important, and recycled aggregate concrete (RAC) has gained global attention for its environmental benefits [].RAC is made from recycled concrete aggregate (RA), which …
Carbon Footprint of Recycled Aggregate Concrete
Five concrete mixes were produced with a water/cement ratio (w/c) of 0.5 and other five mixes with a w/c of 0.7. Five replacement rates of coarse aggregate by recycled coarse aggregate (%R) were used: 0, 25, 50, 75, and . OPC was used in all mixtures, and its production process was considered independently from the rest of the …
Application of Steel Slag as an Aggregate in Concrete …
The current steel slag recycling process can fix 60–80 million tons of CO 2 gas annually ... coarse SSA and observed a significant increase in elastic modulus at 61.5%. Beaucour et al. compared concrete with coarse aggregate from EAF steel slag, barite, and dolomite, while SSAC has a dynamic modulus of 50.1% higher than barite …
Effect of moisture on concrete damage and aggregate recycling …
Xiao [18, 19] conducted an intensification test on recycled coarse aggregate (RCA) by low-power microwave. Compared with the traditional technique, microwave heating can improve the efficiency of mortar and aggregate debonding. ... systematically discussed the possibility of microwave technology in the concrete recycling process …