2.1. Mechanical Treatment of Aggregates. The treatment method was based on the mechanical grinding of the adhered mortar from the surface of the RCA. The aggregates were placed inside a 100 L capacity concrete drum mixer along with water, where the rotating motion allowed the aggregates to collide with each other and with the metal walls of the drum.
Dec 08, 2020 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
Apr 24, 2021 Recycle concrete aggregates (RCA) consist of natural aggregates and remnant mortar adhered to their surface. The amount, size, and morphology of the adherent remainder paste influences quality aspects of RCA, such as their bonding potential with new cement matrix in an RCA-based concrete, as well as the concretes overall rheological and performance characteristics.
By changing the molarities of acid solution study was made on the physical and mechanical properties of recycled coarse aggregates. From their investigation found that change in molarities of acid solution enhanced the physical and mechanical properties. Shruti K3 In her investigation on recycled aggregates obtained from pile foundation. Studies on acid treatment made with 2N
Jan 01, 2021 Methods of treatment for recycled aggregate 2.1. Chemical treatment. Aggregate displays that coarse recycled concrete aggregate is washed then dried out at... 2.2. Mechanical grinding treatment or ball milling method (BBM). In this study Ball
Jan 25, 2021 Lime and mechanical treatment of RCA is more effective than mechanical treatment alone. 30% substitution of natural aggregate by RCA is optimal for M40 grade concrete. The dependency of LMRC properties on normality of lime solution is more than on duration of lime treatment.
Nov 08, 2021 Mechanical and durability properties of recycled aggregate concrete effect of recycled aggregate properties and content Journal of Materials in Civil Engineering , 30 ( 2 ) ( 2018 ) , p. 04017275 , 10.1061/(ASCE)MT.1943-5533.0002142
Nov 01, 2019 Furthermore, mechanical rubbing for 5 min was also performed on A-RA using an empty concrete mixer to obtain acetic acid treated and mechanically rubbed recycled aggregates (AR-RA). As the complete removal of old adhered mortar cannot be achieved after the acid immersion, the effect of accelerated carbonation on the remaining old adhered mortar on the surface of A-RA is studied.
Influence of Treatment Methods on Recycled Aggregate Concrete made with Recycled Coarse Aggregate 1Shrinath.H, 2Bharat Kumar, ... By changing the molarities of acid solution study was made on the physical and mechanical properties of recycled coarse aggregates. ... Angeles Abrasion testing machine. The process followed in this method is shown ...
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.
May 05, 2015 The physical and mechanical properties of these aggregates, and their strength and performance of recycled aggregate concrete are determined. The results show that treatment with H 2 SO 4, and heating and scrubbing yield, aggregate with reduced water absorption and other desired properties of natural aggregate. The concrete made out of these ...
May 15, 2016 The recycled aggregates were subjected to various presoaking surface treatment methods and the performance of each treatment methods on physical and mechanical properties were estimated. For presoaking surface treatment, the recycled aggregates were presoaked in three different acidic solutions namely, hydrochloric acid (HCl), nitric acid (HNO ...
Oct 10, 2021 Elastic modulus is one of the most important mechanical properties of concrete (including recycled aggregate concrete), and it has a notable guiding significance for engineering. There is a lack of micromechanical research on the elastic modulus of recycled aggregate concrete. This paper adopts four models based on micromechanics, including the Voigt model, Reuss model, Eshelby method, and ...
Nov 16, 2021 In this study, modification methods of recycled coarse aggregate (RCA), namely spraying colloidal nano silica (NS) and silica fume (SF) on the surface of RCA, were adopted to enhance the performance of recycled aggregate concrete (RAC). In the RCA modification methods, colloidal NS with different particle sizes (12 nm, 54 nm and 106 nm) and colloidal SF with a particle size of 420 nm
Jan 28, 2018 recycled concrete aggregate (RCA) in concrete involves various obstacles and controversial issues in controlling the quality of recycled aggregate concrete (RAC). This study is an effort to improve the quality of RAC containing 100% coarse RCA by using pozzolanic and sodium silicate solution as new treatment solutions.
Nov 17, 2021 Using recycled pavement materials to construct new pavement base is currently an important construction strategy bringing improved sustainability. This study investigates the long-term performance of pavement bases constructed with recycled concrete aggregate (RCA), reclaimed asphalt pavement (RAP), and blends with natural aggregates in a seasonal frost region.
Nov 02, 2021 Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from CDW, replacing natural aggregates (NAs) in the manufacture of precast
Nov 05, 2021 Hollow concrete masonry blocks made of low strength self-compacting concrete with recycled crushed brick and ground polystyrene as an aggregate (RBC-EP blocks), and their expected structural role as masonry infill in steel frames, has been confirmed in previous research studies, thus the extensive investigation of thermal properties is presented in this paper to fully approve their potential ...
A novel recycled aggregate concrete was prepared by replacing the natural aggregate with recycled lightweight aggregate. Subsequently, the mechanical properties and compressive stress-strain constitutive relation of the recycled lightweight aggregate concrete (RLWAC) were explored. For this purpose, the recycled lightweight aggregate (RLWA) replacement ratio (0x0025, 25x0025,
Apr 15, 2020 Studies have shown that the incorporation of waste tire rubber aggregates reduces the strength, increases permeability and decrease thermal conductivity of concrete. However, only a few studies have investigated the effect of surface-modified rubber aggregates on the properties of concrete. This study investigates the effect of the surface treatment of waste tire rubber as coarse aggregates ...
In this regard, mechanical treatment in the Los Angeles Machine on RCA surface possibly originated an increase in the adherence of asphalt -aggregate within the asphaltic mix, obtaining the ...
Apr 30, 2020 This paper investigated the mechanical properties of recycled aggregate concrete (RAC with recycled clay brick aggregates (RCBA) as the coarse aggregates) modified by nano-particles, i.e. nano-SiO2 (NS), nano-CaCO 3 (NC) and multi-wall carbon nanotubes (MWCNTs). Two experimental phases were carried out.
Jan 24, 2019 3.5. The Mechanical Treatment of Recycled Concrete Aggregate. The last stage of the recycled aggregate quality improvement was mechanical processing. The Los Angeles drum was used for that purpose. The machining time was set at 5 min, 10 min, and 15 min, respectively.
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
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
aggregates in the impact resistance, through a better understanding the behavior of recycled plastic in concrete structures, experimenting fresh and hardened concrete mixtures containing recycled plastic. 1.2 Problem Statement Gaza Strip is a small closed coastal area (365 Km2) and a densely populated
the better quality recycled aggregate by separating the impurities in the recycled aggregate. This treatment method is simple and has certain effect on removing dust from recycled aggregate and enhancing interface adhesion. Jung-mann26 impr ove the production process by washing the broken
Mar 08, 2021 In the construction industry, an approach to alleviate the environmental problem is to apply ecological composite materials to the construction field. In this paper, the authors added the recycled aggregate and the rice husks to the concrete and measured the strengths of rich husk recycled concrete (RHRC) with different factors as well as determined the constitutive model.
recycled aggregate, recycled aggregate treated with HCl and H2SO4, recycled aggregate obtained after scrubbing treatment, and heating and scrubbing treatment. The physical and mechanical properties of these aggregates, and their strength and performance of
mechanical properties of recycled concrete aggregate to be close and comparable to that of natural aggregates. (Junak Sicakova, 2017) demonstrated that surface treatment on medium quality recycled concrete aggregate may reduce its water absorption capability. They modified the surface properties of the recycled concrete aggregate using geo-polymer materials based on fly ash resulting in an ...
Apr 24, 2021 Europe PMC is an archive of life sciences journal literature.
Jun 06, 2021 After 28 days, tests are carried out on the specimens. The results show that the mechanical treatment followed by the SF combination significantly enhances the performance of recycled aggregate concretes (RACs). Satisfactory test results are generally obtained for treated recycled aggregate concrete (tRAC) produced with up to 60% tRA and 10% SF.
Sep 15, 2021 The adherence of mortar on the surface of RCA affects the mechanical and durability properties of the recycled aggregate concrete (RAC) (Abdulla 2014, Dhir and Paine 2007, Xu and Shi 2000, Ho et al. 2013, Otsuki et al. 2003, Katz 2004, Revathi et al. 2014, Saravanakumar and Dhinakaran 2014, Juan De and Gutirrez 2009).Puthussery et al. reported that replacement of RCA beyond 50%
Aug 17, 2021 Concrete made using the impregnated aggregate was tested and the results were compared with those of concrete made using untreated recycled aggregate of the same kind. The results indicate that impregnation of aggregate improves the mechanical properties of concrete in many cases but reduces its resistance to cyclic freezing and thawing.
Recycled Iron and Steel Slag Aggregate 37 effect of using steel slag aggregate on mechanical properties of concrete while Olonade et al. (2015) studied performance of steel slag as fine aggregate in structural concrete however the effects of fine steel slag on flexural strength of