Concrete containing recycled aggregates have different properties from concrete containing natural aggregates. This work investigates, firstly, the possibility of using recycled refractory bricks (RBA) as coarse aggregate for concrete, and secondly, finds the ideal replacement percentage of natural coarse aggregate (NCA) by RBA. For this, an experimental study was carried out to assess the ...

This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA …

Verma A, Babu VS, Arunachalam S (2021) Characterization of recycled aggregate by the combined method: acid soaking and mechanical grinding technique. Mater Today Proc. 13. Nagataki S, Gokce A, Saeki T, Hisada M (2004) Assessment of recycling process induced damage sensitivity of recycled concrete aggregates. Cem Concr Res 34(6):965–971

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete ... The treatment method was based on the mechanical grinding of the adhered mortar from the surface of the RCA. ... Zadeh A.H., Mamirov M., Kim S., Hu J. CO2-treatment of recycled concrete aggregates to improve mechanical and environmental ...

12%Recycled tyres are granulated at a nominal ambient room temperature condition by shredding and grinding, sourced from vehicle passenger car tyre and bagged in 25 kg packs. Rubber used for this investigation is classified as crumb rubber, which is in the particle range size of fine aggregates (0.075–4.75 mm), and is substitute with a portion ...

By treating the recycled aggregate with all treatment processes the physical, mechanical, and durability properties are improved when compared to untreated recycled coarse aggregate concrete.

situ recycling of the aggregate is one of the primary goals of the C2CA. In the C2CA process, after crushing of EOL concrete, autogenous milling is used to remove the loose mortar from the surface of the aggregates. The removal of the loose mortar is important to improve the mechanical strength of the recycled aggregate [7]. After

Strength and Durability Properties of Treated Recycled Aggregate Concrete by Soaking and Mechanical Grinding Method: Influence of Processing Technique Jul 30, 2021 AbstractThe use of recycled aggregate (RA) generated from construction and demolition (C&D) waste to produce new concrete would minimize the…

Development of a Sustainable Concrete Waste Recycling... - J-act Hashida 2005)", "Mechanical grinding (Takeshita et al. 2002; Yanagibashi et al. ... refining methods consists of recycled coarse aggregate of about 35% and recycled... concrete, a wet grinding treatment process is added for improved quality.

A STUDY ON RECYCLED CONCRETE AGGREGATES PAVAN P S 1, BABITHA RANI H,DEEPIKA GIRISH, RAGHAVENDRA K M 2, VINOD P N 1,DUSHYANTH.V.BABU.R,SHAIK NUMAN1 1Assistant Professor, Department of Civil Engineering, SET, Jain University. 2Student, Department of Civil Engineering, SET, Jain University. Abstract The amount of construction waste has been dramatically …

A novel treatment method for recycled aggregate and the mechanical properties of recycled aggregate concrete. ... The main mechanical methods include mechanical grinding, ... the results suggested that CA treatment can be applied as a simple method to improve the quality RCAs, which can then be used to prepare RAC. 3.2.3.

To address this issue, some aggregate refining methods such as "freeze-thaw," "thermal expansion," and "mechanical grinding" [10–12] have been proposed to refine the quality of recycled aggregates by eliminating the adhered mortar but keeping the integrity of natural coarse aggregate. However, these techniques involve complicated ...

This paper presents the results of a study that investigated the improvement of the mechanical properties of recycled concrete aggregate (RCA) produced by adding chopped basalt fibers (BF) with contents of 0.1%, 0.3%, 0.5%, 1%, and 1.5% by total volume of the mix to treated and untreated recycled aggregates.

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete ... The treatment method was based on the mechanical grinding of the adhered mortar from the surface of the RCA. ... Zadeh A.H., Mamirov M., Kim S., Hu J. CO2-treatment of recycled concrete aggregates to improve mechanical and environmental ...

12%To improve the efficiency of abrasion, various forms of abrasion media may be combined to apply higher energy to the ground item and enhance the grinding efficiency [2, 10, 11].In case of using sulfuric acid solution as the washing fluid, there is a reaction involving calcium hydroxide present in high amounts in sulfuric acid and recycled aggregates and finally the reaction …

The properties of recycled coarse aggregate and the slump, the physical and mechanical properties and durability of recycled aggregate concrete were studied through tests. The results indicate that the slump, compressive strength and durability of concrete with recycled aggregate are lower than that of concrete with natural aggregate when recycled coarse aggregate fully absorbs water.

Production technology of recycled aggregate (mechanical grinding method) aggregate producing - aggregate processing plant . 2/24/2004 · A method of producing an improved aggregate product from in ... improved mechanical grinding method for recycled aggregate 9.4 …

The mechanical forces are usually applied in the form of centrifugal action caused by an eccentric shaft rotor or by grinding the aggregate in a revolving drum with iron balls.

For the removal method, mechanical grinding [5], heating and rubbing [6] as well as acid soaking [7] are commonly used. Mechanical grinding aims to pulverize the adhered mortar by mechanical ...

2.1.2. RAI. The RAI used in this study are selected from the recycled material of the base course of Linxia section of the provincial pavement in Linfen City, Shanxi Province. 56.2% of the coarse aggregate and the measured crushing value of 10–15 mm reach 25.8%, and the sand equivalent of the fine aggregate of the RAI reaches 75%, with a great degree of cleanliness, which is conducive to the ...

By treating the recycled aggregate with all treatment processes the physical, mechanical, and durability properties are improved when compared to untreated recycled coarse aggregate concrete.

improved by the mechanical grinding treatment, but when those of less th,an O.6mm were replaced, the mechanical grinding treatment had little effect. For this reason, the particles ofless than 0.6mm in recycled fine aggregate have been found to significant influence the properties ofthe mortar. Therefore, attentions must be paid the particles ...

to managing recycling are (1) standard mechanical recycling, which aims to recover plastic via mechanical processes (sorting, grinding, cleaning, drying, re-granulating, etc.) and produces recyclates that can be transformed into new plastic products, and (2) recycling in the form of repurposing the waste plastic without fully breaking it down [6].

3. Removal of adhered mortar. Mechanical grinding, pre-soaking in water/acid are the common methods to remove the adhered mortar. Mechanical grinding is a popular treatment because of the simple procedure to produce high quality RCA (Sun and Xiao, 2004).However, mechanical grinding could easily damage RCA due to collision and grinding by introducing micro-cracks.

treating recycled aggregate by mechanical machine. potential use of recycled coarse aggregates in concrete. was fragmented manually further, and then 10 kg of c d waste was placed in los angeles aggregates testing machine with constant charge and the apparatus was run for 5 minutes. hisham qasrawi (2014), the use of steel slag aggregate to enhance the mechanical properties of …

grinding operation. Grinding RCA at the Rev of 250 counts is sufficient to improve its quality for this tube mill. The grinding efficiency increased while grinding using the steel rods having higher S a or smaller rod sizes. Keywords: recycled concrete aggregate, tube mill, steel rod, revolution count, contacted surface area, mass. 1. Introduction

Concrete Additives for Recycled Aggregate Concrete In addition to the production and use of cement-based products, the recycling and effective use of demolished concrete aggregate represents an opportunity for further environmental benefits to the construction industry. In the UK alone more than 50 million tonnes of concrete

This paper presents an overview of the different techniques which the construction industry can use to improve the performance of recycled aggregate concrete (RAC). ... mechanical grinding method ...

This is the general method of obtaining recycled aggregates. 8 Methods of producing High-Quality RA: Improved mechanical grinding method Air-heating and grinding method. 9 Improved mechanical grinding method: Concrete rubble is crushed to 50mm or less in size.

The paste/mortar attached to the recycled aggregate decreases the quality of the aggregate and needs to be stripped. The stripped paste/mortar is roughly 20% to 50% in waste concrete, but relevant research is very limited. In this paper, the effects of ground waste concrete (GWC) powder, coming from the attached paste/mortar, on water demand for normal consistency, setting time, fluidity, …