This paper presents an in-depth study on the effect that composition and properties of recycled coarse aggregates from previous concrete structures, together …
The average flexural strength shown in Fig. 11 increased by increasing the percentages of replacement of coarse aggregates by recycled concrete aggregates …
DOI: 10.14359/51742018. Date: 6/18/2024. It is known that the use of recycled coarse aggregates (RCA) can raise a variety of problems, which are mainly …
Natural coarse aggregate (NCA) was natural gravel, and RCA was recycled concrete coarse aggregate, which was obtained from demolished concrete buildings through crushing, screening, sieving and grading and was purchased from Shaanxi Jianxin Environmental Protection Technology Co. Based on the maximum bulk density of …
Coarse aggregate plays a vital role in concrete construction. Explore its properties, types, and applications. Find out what aggregates mean. ... It is typically made up of various materials such as gravel, crushed stone, and recycled concrete. The size of the coarse aggregate can vary, but it is typically between 3/8 inch and 1.5 inches in ...
The modification method and the replacement rate of recycled coarse aggregate (RCA) have a great influence on the properties of recycled aggregate concrete (RAC). This paper aims to study the properties of RAC changes with the replacement rate and analyze the modification mechanism. Composite impregnation treatment was …
Recycled Aggregate can be used in the following constructions. Can be used for constructing gutters, pavements etc. Large pieces of crushed aggregate can be used for building revetments which in turn is very useful in controlling soil erosion. Recycled concrete rubbles can be used as coarse aggregate in concrete.
Recycled aggregate (RA), including recycled fine aggregate (RFA) and recycled coarse aggregate (RCA), is generated by crushing old concrete from C&D wastes [2], [3]. Recycled aggregate concrete (RAC) uses RA to partly or entirely substitute the natural aggregate (NA). RAC is an environmentally friendly material that decreases …
Six concrete mixes with the same content of coarse aggregate and water-cement ratio were prepared for the research. The first mix contained only natural aggregates, while the second mix was replaced in half by recycled aggregates. In subsequent samples, the recycled aggregate in 5% by volume was successively …
This study investigates the potential of incorporating recycled fine aggregates (RFA) into sustainable concrete. In this research, a conventional compaction technique is utilized to establish the order of compressive strength and, consequently, to assess particle packing density in terms of weight within a specific cylindrical volume …
Introduction. Coarse aggregate is an essential component of concrete and plays a vital role in the construction industry. It consists of granular materials, such as crushed stone, gravel, or recycled concrete, which are larger in size compared to fine aggregates.
In the present investigation, an attempt was made to study the influence of the strength of parent concrete on the properties of recycled aggregates and recycled aggregate concrete. In this study, four grades of normal concrete mixes: M20, M25, M30, and M40 were considered as parent concrete to produce the recycled coarse …
Hebhoub et al. (), using the marble waste in the concrete manufacturing solves this problem environmentally and economically, especially with a 75% replacement value -of any formulation- under constant water to cement ratio.The use of the marble waste as replacement for coarse and fine aggregate separately or together leads to an …
Notable examples include studies on: recycled concrete aggregate properties with amounts of old adhered mortars (Duan and Poon Citation 2014), the current status on the use of recycled aggregates in concrete (De Brito and Silva Citation 2016), a critical review and assessment of recycled aggregate as a sustainable construction …
1.1. Significance of recycled aggregates. Construction industry has seen massive expansion in the 20th and 21st century. The construction sector is the second largest carbon dioxide emitter, accounting for roughly 33% of the total global carbon dioxide emission [7].Globally buildings cause 33% of the total greenhouse gas emission and …
1. Introduction. Managing the waste generated by human activity is a worldwide challenge. According to Eurostat [1], in 2016 around 2535 Mt of waste was generated in the EU as a whole, 36.44% of which (~92.4 Mt) attributable to the construction industry. The enormous impact of such vast amounts of waste has driven the institution …
Four distinctive RAC is delivered formed with 0%, 25%, 50% and of recycled coarse aggregates, separately. In common, the workability of recycled aggregate concrete is influenced with the retention volume of the reused aggregates. Concrete smashed by an effect of impact crusher accomplishes a high rate of recycled …
Du et al. [6] reported that the micro-hardness of recycled coarse aggregate (RCA) was much higher than that of the interfacial transition zones (ITZs) in the RAC, and the micro-hardness of the interface between the RCA and the new mortar matrix was the lowest. Poon et al. [7] investigated the effect of microstructure of ITZ on the compressive …
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701. ACI Middle East Regional Office ... Title: Shear Behavior of Recycled Coarse Aggregate Concrete Beams after Freezing-and-Thawing Cycles. Author(s): Tian Su, Jin Wu, Guixin Yang, Xianhang Jing, …
Fig. 10 shows concrete containing natural coarse aggregate and recycled brick coarse aggregate (Liu et al., 2021). Hence, the RCA's physical, chemical, and …
The use of recycled coarse aggregate (RCA) obtained by crushing, screening, and washing construction and demolition wastes to produce recycled aggregate concrete (RAC) can alleviate the shortage of concrete raw materials and promote waste concrete recycling [1], [2], [3], [4].However, compared with natural coarse aggregate …
The binder, fine, and coarse aggregate mix ratios in the mixes were 1:1.54:2.4, where the binder consisted of OPC and 10% OPC replacement by silica fume. The eight concrete mixes were prepared and subdivided into two groups. Two control mixes were taken considering the two size ranges of coarse aggregate.
1. Introduction1.1. Concrete contained recycled coarse aggregate and nano-silica. Over the past several years during which the total life cycle concept has been put forward in the construction industry, a number of researchers have conducted some investigation about the feasibility of reusing waste concrete ingredients [1].The …
Recycled Coarse Aggregates (RCA) are produced using an impact crusher, which processes damaged concrete sourced from construction and demolition waste into the required sizes. The RCA exhibits passage on a 40 mm sieve and retention on a 4.75 mm sieve, with 92.10% and 0.38% of the material passing through 20 and 10 …
The uniaxial compression behavior of concrete with 0.98 to 3.15 in. (25 to 80 mm) large-size recycled coarse aggregate (LRCA) was numerically studied. ... ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701. ACI Middle East Regional Office
C & D waste aggregates are primarily used in the sub-base layer of road and embankment constructions. The rationale for not employing recycled coarse aggregate (RCA) for structural purposes is that, its properties are inferior to natural aggregate (NA) [10].The main disadvantage of RCA is that it has a lower specific gravity and absorbs …
With the increase in the use of recycled aggregate concrete, the demand on recycled aggregate (RA) is escalating. As such, the behaviour and characteristics of RA need to be clearly understood. ... Strength of recycled concrete made from crushed concrete coarse aggregate. Concrete International: Design and Construction, 5 (1) …
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 …
