characteristics of aggregate recycling

The physical-chemical and mechanical characteristics of recycled aggregates play an important role in their correctly chosen applications.

In this experiment, C30 ordinary concrete is used as the strength benchmark for mix design. The secondary mixing method is adopted [30], the water-cement ratio is 0.45, the brick-concrete aggregate replaces 30% of the coarse aggregate by volume, and the ratio of RBA and RCA is 1:1.The specific mix ratio is shown in Table 4.Cubes with a …

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 and …

Air-cooled copper slag has a black colour and glassy appearance. The specific gravity varies with iron content, from a low of 2.8 to as high as 3.8. The unit weight of copper slag is somewhat higher than that of conventional aggregate. The absorption capacity of the material is typically very low (0.13%).

Chemical recycling techniques for concrete that have been developed in recent years are attracting increasing attention. The theories of techniques for recycling and reusing concrete waste by using chemical methods tend to take advantage of the characteristics of concrete waste. Concrete contains ∼70% aggregates and ∼30% …

This paper aims to investigate the influence of the diffusion time and mixing temperature on the fatigue performance of fine-aggregate matrices (FAMs) because more studies at this scale are needed to broaden the knowledge on the diffusion process and to improve the techniques for mixture recycling.

Hanumesh et al., 2018 [51] utilized PPFs in RAC and noticed increases in shear strength and mechanical characteristics with 25% recycled aggregate [52]. ... Similarly, coarse recycling aggregate will help save the natural reserves of limestone and other mineral resources used as aggregates and help preserve the environment. 5.

The physical properties such as grading, size and texture, density, specific gravity, water absorption, flakiness and elongation indices of recycled aggregates are …

The main characteristics of recycled fine aggregate and recycled coarse aggregate are reported in this study, along with a distinction between these characteristics and trademark sums.

The using of recycling coarse aggregate in construction work included an effort in recycling technology. It would reduce the usage of natural coarse aggregate and would reduce the material cost.

The synergetic recycling of MSA and RCA as construction materials to produce the mussel shell-recycled aggregate concrete (MS-RAC) may be a wise option. ... Leem, Effect of oyster shell substituted for fine aggregate on concrete characteristics: Part I. Fundamental properties. Cem. Concr. Res., 35 (11) (2005), pp. 2175-2182.

Recycled concrete aggregate (RCA) has been widely used as a resource in reinforced soil structures, especially as a substitute for natural aggregate. Direct shear tests were conducted using a dynamic direct shear apparatus to study the effects of particle-size gradation (0.06–37.5 mm) on the shear properties of RCA-geogrid interface, in which ...

This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion …

20% fine aggregate for waste glass obtains satisfactory results. ... glass in cement-based materials and the different effects that have been found to investigate the viability of this recycling method. 2. Characteristics of glass and methods of processing crushed glass2.1. Physical and chemical characteristics of glass.

Abstract. Recycled aggregate (RA) is a product of construction and demolition wastes, and RA particle presents low strength and adhesion with asphalt mortar compared with natural aggregate. With the aim of studying fracture characteristics of recycled aggregate asphalt concrete (RAAC), the influence of RA on interfacial zone …

This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, with …

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 ...

The COTE value of concrete made with natural coarse aggregate was 9.91×10-6m/m/°C, that of job-site produced recycled coarse aggregate was 10.45×10-6m/m/°C, and that of recycled aggregate ...

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 has been extensively studied, but its mechanical and durability characteristics fall short of those of natural aggregate …

PDF | In structural concrete, it becomes essential to perform the comprehensive research work for recycled aggregates (RA) in order to check their... | Find, read and cite all the research you...

The objective of this paper is to provide a comprehensive study about the performance of. concrete using mixed coarse recycled aggregate (MCRA) as an alternative for natural aggregate (NA) at ...

3.2.1 Grading, Shape and Surface Texture. Buck reported that the recycled aggregate does not have a high amount of flaky and elongated particles.Frondistou-Yannas reported that good particle size distribution of recycled aggregate can be produced from uncontaminated concrete rubbles.Hasaba et al. ascertained that depending on the …

The number of waste rubber tires (WRT) accumulating every year is soaring at an alarming rate. It is estimated that by 2030, this number will reach about 1.2 billion (Mondal and Biligiri 2018).WRT being generated in large proportions, poses major environmental, economic, and social threats (Azizian et al. 2003; Dong et al. 2013; …

The utilization of processed rubber and construction waste in lieu of soil as a substrate could improve significantly seismic performance, while addressing the pressing environmental issue of how to reutilize and dispose of, i.e., automotive tires and demolition by-products. In this study, a series of laboratory tests explore the influence of recycled …

First, the aggregate fragmentation caused by compaction effort was simulated using the superpave gyratory compactor. In this regard, the influences of aggregate type and RA content were investigated. Second, the indoor experiment scheme was determined using the Taguchi method to obtain compaction data of recycled …

Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, …

For each aggregate size of 12.5mm (Downsize), five concrete mix proportions were used with (0%, 25%, 50%, 75%, and ) replacement of natural coarse aggregate with recycled coarse aggregate.

Use of good quality materials all the time is not a sign of good engineering as it can be costly and energy and natural resources consuming. From this point of view, the idea of recycling of concrete to produce recycled aggregate (RA) is developed. The use of recycled aggregate concrete in this time of modern civilization opens a whole …

It is critical to improve the strength parameters of recycled coarse aggregate concrete to be equal to aggregate concrete. Thus, the research focusses on using different percentages of replacements of ordinary Portland cement with a supplementary cementitious materials (SCMs) to determine the best combination for structural purposes …

In this paper, the stress–strain behaviour, mechanical properties, characteristic stress, and damage evolution of multi-recycled aggregate concrete (Multi-RAC up to 3 recycling cycles) under triaxial compression were investigated, considering the effects of confining pressure and number of recycling cycles.