PDF First Graphene Ltd. Technical Article GRAPHENE ENHANCED

to prepare a cement mortar and then RAC concrete prepared. An enhancement in RAC performance was achieved by washing the recycled aggregate and doping the cement mortar with 0.01%w/w of PureGRAPH® graphene additives. The compressive and tensile strengths of the resulting RAC were enhanced by 43.9% and 24.1% respectively to reach values of

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PDF Recycled Aggregates for Green Concrete

conditions, natural aggregates (C1) as the control sample, High Strength Recycled Aggregates (C2) and Low Strength Recycled Aggregates (C3). The PPO methods based on Fuller and Thompson equation and gradation curveswere applied to 100% Recycled Coarse Concrete Aggregates. A total of 96 samples were analyzed and tested at 7, 14 and 28

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A novel treatment method for recycled aggregate and the

Jan 01,  · Establishing an effective method to enhance the adhesion of mort recycled concrete aggregate (RCA) is key to the utilization of RCA. In this paper, a novel and simple approach for strengthening the mortar layer of RCA by treatment with a crystallizing agent (CA) was proposed, and the effects of different treatment regime on the density, water absorption, mineral composition, and

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RECYCLED AGGREGATE CONCRETE (RAC) - Civil Abhyaas

May 28,  · Recycled aggregate concrete is the name given to the concrete having coarse aggregates taken from “old concrete” i.e. which obtained from demolition work and that from laboratory waste. It involves number of operations in manufacturing of recycled aggregates. The basic operations are separation, crushing, separation of ferrous elements, screening, decontamination

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Frequency-Dependent Damping Properties of Recycled

The damping of RAC is more frequency-sensitive than that of natural aggregate concrete (NAC). A linear relation among the damping parameters and the mortar content of RAC is established. With the increasing RCA replacement from 0% to 100%, the loss factor and hysteretic energy of RAC increase, and the loss modulus firstly increases and then

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EFFECT OF TEMPERATURE ON RECYCLED AGGREGATE

concrete made with natural aggregates at the same water to cement ratio”. Sagoe, Brown and Taylor [8], explained that the differences between the characteristics of fresh and hardened recycled aggregate concrete and natural aggregate concretes are relatively narrower than reported for laboratory crushed recycle aggregate concrete mixes.

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PDF) Assessment of the surface permeation properties of

According to the criteria existing for ordinary concrete made with natural aggregate, RAC could be classified as being of moderate quality rather than poor quality. The testing methodology shows that some of the techniques used to measure the permeability of RAC need to be modified in order with the distinctive characteristics of this material

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Materials | Free Full-Text | The Simple Mix Design Method

For the environment protection and sustainable development in building construction, waste concrete can be processed into recycled aggregate to mix the recycled aggregate concrete (RAC). However, the existing mix design methods of RAC were complex, and the mechanical properties of RAC were more weakened than ordinary concrete. This paper presents a simple mix design method for RAC, including

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A review on recycled concrete aggregates (RCA

Jul 19,  · This article also documents the microstructure and properties of recycled aggregate concrete (RAC) and methods to improve its performance. Keywords: Construction and demolition waste detrimental effects natural aggregates recycled concrete aggregates recycled aggregate concrete sustainable construction.

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Concrete Infrastructure Research Database | National

Recycled concrete aggregate (RCA) is a high-quality substitute for aggregate as base or subgrade material in pavement construction. However, heavy metal leaching and/or production of high pH leachate are environmental risks commonly associated with the use of RCA. and recommendations on acceptable methods for handling concrete

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Behaviour of recycled aggregate concrete under combined

aggregate replacement methods are direct weight replacement, direct volume replacement (DVR) and equivalent mortar volume (EMV) replace-ment (23-24). However, RAC mixtures made using the EMV method exhibit poor workability, segre-gation, and honeycom (25). In this paper, the DVR method was used to prepare RAC. To control

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Materials | Special Issue : Recycled Concrete with Waste

Mar 31,  · Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources.

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Base Datos | PDF | Word Press | Internet - Scribd

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Review on Recycled Aggregate Concrete in the Past 15 Years

adsorption of waste concrete aggregates should be considered and the water should be added together with water content calculated according to the approach for conventional concrete. RAC using this method can meet the requirement of national code on workability and strength. Shi (2001) proposed an approach for the mix design of RAC based on free

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The Biaxial Compressive Mechanical Properties and Strength

In this paper, the tests under biaxial compression were conducted on five kinds of recycled aggregate concrete (RAC) by stress ratios (0:−1, −0.1:−1, −0.25:−1, −0.5:−1, −0.75:−1, and −1:−1) at the strain rates of 10-5/s, 10-4/s, 10-3/s, and 10-2/s. This study was accomplished in the servo-hydraulic multi-axial testing system, which was carried at Dalian University

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Reclamation chain of waste concrete: A case study of

Reclaiming the waste concrete to produce recycled aggregate (RA) and recycled aggregate concrete (RAC) is an effective method to reduce the C&D waste. This paper develops a reclamation chain of waste concrete based on the researches and practices in Shanghai.

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