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 …

This literature mainly introduces compressive properties of recycling polypropylene (PP) fiber recycled coarse aggregate concrete. • The effects of waste PP fiber volume fraction, length-diameter ratio and substitution ratio of recycled aggregate(RA) on the axial compressive properties of waste PP fiber recycled 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 …

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 …

This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and …

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 …

This paper presents guidelines for using recycled-concrete aggregate (RCA) as a full or partial replacement for natural coarse aggregate in new concrete (RCA concrete). Several international standards and guidelines for the use of RCA in concrete are reviewed and contrasted to identify areas in which further development is required.

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 …

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 …

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 ...

Download PDF. Huai-Ying Fang, Fu-Lin Liu & Jian-Hong Yang. 424 Accesses. 12 Citations. Explore all metrics. Abstract. This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits. See more

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 …

CDW recycling process transforms demolished materials into a smaller-sized fraction in mobile or fixed recycling plants [13]. The number of recycling stages and different types of crushing influences recycled aggregates characteristics. ... The shape of the coarse aggregate grains directly influences the quality of the concrete as it changes ...

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.

Preparation of Recycled and Multi-Recycled Coarse Aggregates Concrete with the Vibration Mixing Process. by. Fa Yang. 1, Yunshi Yao. 1,2,*, Xinxin Wang. 1, Jin Wei. 1 and. Zhongxu Feng. 1,2.

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 …

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 …

Microwave-assisted concrete coarse aggregate recycling technology has been proved to have the characteristics of low energy consumption [30], [31]. Concrete made from coarse aggregate treated at low microwave power level (2 kW ∼ 3 kW) has the similar strength and elastic modulus as natural coarse aggregate concrete [32].

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 …

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. …

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 …

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 current research project sought to evaluate the effect of powders that have been generated from a repeated recycling process of coarse aggregate concrete. To do so, various analytical techniques have been adopted to examine the chemical, microstructural, thermal, and morphological aspects of RCPs In addition, the influences …

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.

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 …

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 ...

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 …

Recycling of concrete is a relatively simple process. It involves breaking, removing, and crushing existing concrete into a material with a specified size and quality. See ACI 555 (2001) for more information on …

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 …

Abstract. In this paper, a novel extrusion-based 3D printed material was obtained by preparing 3D printed recycled coarse aggregate concrete (3DPRAC) using recycled coarse aggregate (RCA), and the compressive and flexural properties were investigated at different RCA replacement ratios, ages, and construction forms.