to 10% when RCA with water absorption limited to 2.5% and an oven-dry specific gravity of over 2500 kg/m3 (156 lb/ft3) is used. Keywords: artificial intelligence; machine learning; modulus of elasticity; neural networks; recycled concrete aggregate; sustainable infrastructure. INTRODUCTION Construction and demolition (C&D) waste accounts for
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Liu et al. [14] investigated the performance of recycled insulated concrete blocks made from construction and demolition waste comprised of waste concrete, waste brick, and marble crushed and milled as fine (0.15–5 mm) and coarse (5–20 mm) aggregates. The recycled aggregates were activated with calcium hydroxide and a sodium sulfate solution.
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This monograph addresses the use of recycled concrete aggregates (RCA) as a replacement for natural aggregates (NA) in concrete applications.
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The shear strength of Recycled Concrete Aggregate (RCA) in concrete structures varies significantly based on the percentage of RCA used and the specific conditions of the concrete mix. Research indicates that while RCA can serve as a sustainable alternative to natural aggregates, its shear strength is generally lower, necessitating careful consideration in …
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This paper uses waste glass fiber in self compacting recycled concrete (SCRC), forming a kind of waste glass fiber reinforced self-compacting recycled concrete (RGF-SCRC). ... RCA has a lower density and a higher water absorption rate (about 5–8 times) than that of natural coarse ... The typical failure modes of the cube compression tests are ...
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Following the CCUS approach, the re-utilization of cement-based concrete waste through a process known as 'mineral carbonation' has become a promising and widely implemented strategy [17, 19].It has been reported that >3 billion tons of recycled aggregates (RAs) from construction and demolition wastes are produced annually [20, 21], with an expected increase …
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The recycling of construction waste into recycled aggregates for concrete production is highly important for saving resources, protecting the environment, reducing carbon dioxide emissions, and achieving sustainable development of the construction industry [6].However, recycled aggregates have problems such as high porosity [7], [8], high water …
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Download scientific diagram | Typical microwave power absorption record for a 20-mm cylindrical concrete sample (S1). from publication: Recycling-Oriented Investigation of Local Porosity Changes ...
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High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with …
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Porosity and water absorption are related aggregate characteristics, also attributed to residual mortar. NA generally has low water absorption due to low porosity, but …
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aggregates. For instance, Barbudo [9] observed a typical ratio of 2 between the Los Angeles' values of RCA and natural aggregates. Zega et al., ... Water absorption (%) Recycled concrete aggregate (RCA) Gonesse (France) 10-14 32 21 2260 5,6 Recycled concrete aggregate (RCA) Gonesse (France) 10-14 35 27 2159 7,0
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A huge number of research works have been conducted on the utilization of RCA in both structural and non-structural concrete production and those studies indicated that RAC can show enough performance and the researchers have recommended the using of recycled aggregates to a certain amount in replacement of aggregates in concrete [11, 12].At …
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High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with recycled coarse aggregate. ... Magazine of Concrete Research Volume 67 Issue 11 Water absorption variability of recycled concrete aggregates Joseph, Boehme ...
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Water Absorption of Recycled Concrete Aggregates. ... Typical absorption values of between 3% and 10% can be expected and this can be measured and allowed for in the mix design to achieve suitable workability. The moisture …
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In general, recycled aggregates (RA) derived from demolished concrete consist of 65–70 % of natural aggregates and 30–35 % of old cement paste by volume [3].The relative residual cement paste content of RA strongly depend on the porosity of the initial cement paste but it is not significantly affected by the crushing process [4]pared to the typical natural …
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The production of construction solid waste has increased with the acceleration of urbanization in various countries around the world. This waste not only occupies land resources but also adversely affects the ecological environment [1, 2].Converting waste concrete into recycled coarse aggregate for secondary utilization is an effective method for the disposal of …
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As a typical quasi-brittle failure material, Concrete exhibits much lower tensile properties than compressive properties, with tensile cracking often being the primary failure mode. ... Recycled Aggregate Concrete (RAC 1) faces further limitations due to defects in recycled aggregates (RA 2), such as large pores, high water absorption, low ...
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To further enhance CO 2 capture and sequestration in concrete waste, this study investigates the interaction of four environmental factors, i.e., temperature, relative humidity (RH), CO 2 concentration and pressure on the accelerated carbonation of recycled concrete aggregates. 29 groups of accelerated carbonation tests are performed based on the Box …
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Upcycling recycled coarse aggregates (RCAs) in concrete is a promising way to decrease the environmental effect of construction and demolition waste and improve concrete sustainability.
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Recycled concrete aggregates (RCA) have received the attention of several researchers over the last few decades to overcome aggregate shortages and to push towards sustainable and environmental-friendly concrete. ... In a typical concrete mixture, aggregates constitute 60% to 75% by volume. ... The reduction in the water absorption by concrete ...
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This monograph addresses the use of recycled concrete aggregates (RCA) as a replacement for natural aggregates (NA) in concrete applications. It aims to provide information and perspectives on ...
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Sieve sizes commonly used for concrete aggregates are detailed in Table 1, and various physical properties of normalweight aggregates, with typical range values, are shown in Table 2.
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The incorporation of a recycled concrete aggregate (RCA) as a replacement of natural aggregates (NA) in road construction has been the subject of recent research. This tendency promotes sustainability, but its use depends …
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Construction and demolition waste (CDW), the wastes generated from the demolition of structures, usually include materials like concrete, ceramics, and masonry etc., and also characterised by various heterogeneous compounds such as gypsum, glass, bricks, and wood (Cristelo et al., 2018).Recycling the CDW is the most promising choice for reducing the …
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1. Introduction. To implement the system of resource utilization, crushing and reusing discarded concrete has become an important approach. However, the presence of old mortar adhered to the surface of recycled concrete aggregates leads to defects such as high water absorption, high crushing index, rough surface, and high porosity in the RCA [1]. ...
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This article discusses the findings of a feasibility study on the partial replacement of natural coarse aggregate with a poor quality recycled aggregate from construction and demolition waste in the manufacture of concrete of 30 MPa strength grade. The mixed recycled aggregate used had a high asphalt and floating material content. Workability, density, compressive and …
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High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with ...
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Recycled Concrete Aggregates are highly porous and may therefore absorb more water than natural aggregates. Several methods allow for the measurement of water …
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High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with...
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Recycled aggregates typically have higher water absorption and lower specific gravity values than aggregates. Furthermore, this study evaluates the feasibility and …
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