Recycled Aggregate

Highlights. •. Recycled aggregate is a sustainable solution for environmental depletion of construction sector. •. Properties of recycled aggregates can be improved by different …

Recycled Aggregates

This chapter will mainly introduce the crushing and sieving techniques used around the world, the properties of recycled fine aggregate (RFA) and recycled coarse …

Investigation on high-temperature stability of recycled aggregate

However, the presented research mainly employed standard tests, which cannot investigate attached mortar content and the structural characteristics inside the recycled aggregate. Therefore, research on the morphology features of recycled aggregate needs to be further carried out. 1.2. High temperature stability of RAAM

Onstatisticalcharacteristicsofthecompressivestrength of …

of recycled aggregate concrete J. Xiao, J. Li and Ch. Zhang ... It was found that the statistical characteristics of the compressive strength of recycled aggregate concrete do not

Strength and Deformation Characteristics of Recycled Concrete Aggregate

Upon request the closing date may be extended one month. Strength and Deformation Characteristics of Recycled Concrete Aggregate as a Backfill Material Umair Aqil, Research ... Role of chemical and mineral admixtures on physical properties and frost-resistance of recycled aggregate concrete ACI Materials J 1998: (1998) 95 …

Analysis of Shear Characteristics of Recycled Concrete Aggregate …

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 ...

Study on pore characteristics of recycled aggregate …

Section snippets Materials and specimen preparation. This study used ordinary silicate Portland cement P.O. 42.5 with a fineness modulus of 0.63 as the binder, natural medium-sized sand with a fineness modulus of 2.8 as the natural fine aggregate, and natural coarse aggregate and recycled coarse aggregate with a particle size …

Strength characteristics of recycled asphalt pavement aggregate …

G.Masi et al. [11] have researched the part played by RAP as recycled aggregate for concrete. The RAP was collected from five different sites and investigated thoroughly by analysing physical properties, microstructure characteristics, dimensional stability, and durability assessment by freezing-thawing cycles.

Sustainable Materials: A Review of Recycled Concrete …

In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction …

Recycled Concrete Aggregates: A Review | International …

Effects of fine aggregate content on the unsaturated …

Recycled concrete aggregate (RCA) can be used in landfill and slope cover systems, where its unsaturated hydraulic properties play an important role. The hydraulic behavior of RCAs can be potentially controlled through mixing coarse and fine aggregates by a pre-determined proportion, which lacks experimental validation. In this study, water …

Durability Characteristics of Recycled Aggregates for …

Recycled Aggregate in Concrete is a recent development in the use of various types of waste materials in concrete production. ... some characteristics of recycled coarse aggregates obtained by ...

The morphological characteristics of brick-concrete recycled …

Due to the complication of sources and types of CDW, there are great differences in properties among recycled coarse aggregates [6, 7].Most of the demolished buildings in Chinese cities are brick-concrete structures built in the 1960s–1980s, and such recycled aggregates are mainly composed of crushed brick aggregate and crushed …

Characteristics of waste concrete powders from multi-recycled …

The RAC1 was primarily crushed by a laboratory jaw crusher to make recycled materials: recycled fine aggregate (RFA1) smaller than 4.75 mm was subsequently crushed in a Los Angeles ball mill, and RCP1 with a size smaller than 0.15 mm was collected by sieving; recycled coarse aggregate (RCA1) with 4.75–19 mm …

Acoustic emission characteristics of recycled brick-concrete aggregate …

Replacing natural aggregate with construction waste to prepare concrete is an effective way of its resource utilization, which is in line with China 's " carbon peaking and carbon neutrality" strategy and the green development needs of the construction industry.Due to the existing technology is difficult to completely separate waste bricks …

Recycled Concrete Aggregate

Recycled aggregate concrete (RAC) is a new type of concrete produced using crushed, screened, and washed recycled aggregate obtained from waste concrete to replace natural aggregate (NA) partially or completely [1]. ... if the material is not well processed, these characteristics can increase the contamination of the RCA (e.g., brick, tiles ...

A Study on Mechanical and Microstructural Characteristics …

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 replacement levels of 0, 30, 60, and , which can greatly reduce the environmental pollution by incorporating the construction and demolition …

Recycled Concrete Aggregate

Recycled aggregate concrete (RAC) is a new type of concrete produced using crushed, screened, and washed recycled aggregate obtained from waste concrete to replace …

A study on the strength and durability characteristics of …

Recycled aggregate (RA) made from waste concrete is an environmentally friendly alternative to natural aggregate (NA) for concrete manufacturing. However, compared to NA concrete, concrete produced with recycled aggregates has poor characteristics. Supplementary ...

Meso-scale damage characteristics of low carbon concrete with recycled

Low carbon concrete with recycled aggregate (LCCRA) is proposed which has a good compression strength. • The meso-scale damage characteristics of LCCRA is analyzed by gray mean value and gray distribution variance of CT images under uniaxial compression.. The deformation localization of LCCRA is revealed with the combination …

Studies on Strength Characteristic of Recycled Aggregate …

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 …

Evaluation of strength characteristics and identifying the …

The characteristics of recycled coarse aggregate (RCA) and their impact on the strength and durability properties of concrete have been the subject of extensive investigation as studied by Biao Lia et al. [26]. ... Recycled aggregate concrete (RAC), which is made by partially or completely replacing natural aggregates in the concrete …

Strength Characteristics of Recycled Aggregate Concrete …

Fine aggregate was comprised of 60% river sand and 40% recycled aggregate (RA), coarse aggregate used was crushed rock for the development of M50, M60 and M70 grades of concrete.

A sustainable approach of characteristic strength of …

There have been many strength and durability studies taken place to analyze the concrete made with coarse aggregate which has recycled from the old concrete structures and proved high strength compared to the concrete made with new materials. ... "Strength characteristics of ternary blended recycled aggregate concrete. Int. J. Civil …

Compressive Strength and Infiltration Characteristic of …

Construction and Building Material 86 178-188 [4] George Wardeh, Ethan G and Hector G 2014 Mix Design and Properties of Recycled Aggregate Concretes: Applicability of Eurocode 2 International Journal of Concrete Structures and Materials 9(1) 1-20 [5] Cosic K, Korat L, Ducman V and Netinger I 2015 Influence of Aggregate Type and Size on ...

MECHANICAL CHARACTERISTICS OF RECYCLED …

place, is one of. them is to use recycled aggregates for the concrete mix design. Recycled aggregate contains inorganic concrete waste like processed and crush concrete blocks, brick-bats, and recycled steel fiber. Objective of study: We have six main objectives for this study. 1. To study the effect of fumed silica on HPC cube

Characteristics of the carbonation resistance of recycled fine

Under this condition, fresh recycled aggregate concrete (RAC) requires more water than natural aggregate concrete (NAC) for mixing, which probably lead to high porosity in concrete. Otherwise, because of the old cement paste adhered, the interfacial zone between new cement mortar and aggregate in RAC is usually weaker than that in …

Acoustic emission characteristics of recycled brick-concrete aggregate …

Therefore, in this experiment, recycled brick aggregate (RBA) and recycled concrete aggregate (RCA) are mixed in a ratio of 1:1 to form a mixture, and the mixture is replaced with 30% replacement rate to replace natural aggregate to prepare RB-CAC. The preparation process and details are shown in Fig. 2. Table 2 is the mix …

Compaction and shear characteristics of recycled …

Recycling construction and demolition (C&D) wastes into useable aggregates in subgrade applications offers significant sustainability benefits. However, the characteristics of recycled aggregates, including particle morphology, crushing strength, and shear behavior, differ substantially from natural aggregates.This paper presented an …