High-quality coarse aggregate recycling from waste concrete by impact crushing

2020 ◽  
Vol 22 (3) ◽  
pp. 887-896
Author(s):  
Huai-Ying Fang ◽  
Fu-Lin Liu ◽  
Jian-Hong Yang
Keyword(s):  
Coarse Aggregate ◽  
High Quality ◽  
Waste Concrete ◽  
Impact Crushing

The High Quality Technical Research of Road Concrete Recycled Coarse Aggregate

2011 ◽  
Vol 346 ◽  
pp. 47-51 ◽  
Author(s):  
M. Mandula ◽  
Xiao Yu Hu ◽  
Feng Jin Chen ◽  
Wen Long Zhang
Keyword(s):  
Coarse Aggregate ◽  
Chemical Characteristic ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Cement Slurry ◽  
High Quality ◽  
Ordinary Concrete ◽  
Recycled Coarse Aggregate ◽  
Waste Concrete ◽  
Physical And Chemical

This paper studies the recycling of solid waste concrete of the foundational content. Through the experimental research on the use of recycled aggregate and recycled concrete powder, I propose recycled coarse aggregate, recycled powder of various physical and chemical characteristic and the powder mixed with cement slurry mixed with recycled coarse aggregate on the surface of the mechanical properties after treatment. The results show that the coarse aggregate crushing value after surface treatment, strength characteristics of concrete can meet the requirements of ordinary concrete.

Characteristics of Wear Layered Laston Mix Using Waste Concrete Aggregate

2021 ◽  
Vol 3 (3) ◽  
pp. 459-468
Author(s):  
Yanti ◽  
Rais Rachman ◽  
Alpius
Keyword(s):  
Coarse Aggregate ◽  
Mixture Design ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Waste Concrete ◽  
Characteristic Value ◽  
Marshall Test ◽  
Pavement Material

The research objective focuses on testing the characteristics of the Laston Lapis Aus mixture, the aggregate taken later to be studied is the aggregate of Concrete Waste. The method used in this study included testing the properties of coarse aggregate, fine aggregate and filler, after that the Laston Lapis Aus mixture design was carried out after that the marshall test was carried out while the marshalltest was carried out namely the conventional marshall to get the characteristic value. The results showed that the characteristics of the pavement material in the form of aggregates from Concrete Waste tested the 2018 Bina Marga General Specifications as road layers. Through Marshall testing, the characteristics of the Laston Lapis Aus mixture were abtained with asphalt levels of 5,50%, 6,00%, 6,50%, 7,00%, and 7,50%.

scholarly journals Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

2020 ◽  
Vol 10 (3) ◽  
pp. 998 ◽  
Author(s):  
Yuwu Sui ◽  
Chuping Ou ◽  
Shu Liu ◽  
Jinshuai Zhang ◽  
Qingbo Tian
Keyword(s):  
Particle Size ◽  
Thermal Treatment ◽  
Treatment Process ◽  
Activity Index ◽  
Recycled Aggregate ◽  
Thermal Treatments ◽  
High Quality ◽  
Active Elements ◽  
Waste Concrete ◽  
Mechanical Strengths

Waste concrete must be crushed, screened, and ground in order to produce high-quality recycled aggregate. In this treatment process, 15–30% waste concrete powder (<0.125 mm) can be generated. Hydration activity and the reuse of waste concrete powders (WCPs) were studied in this work, and the results illustrated that the particle size changed after a series of thermal treatments at temperatures from 400 ℃ to 800 ℃. The particle size of waste concrete powder decreased by 700 ℃ thermal treatment, and by 600 ℃ thermal treatment, it increased. More active elements appeared in WCP heated by 800 ℃. Nevertheless, the activity index (AI) of WCP, measured by the ratio of mechanical strengths between mortar with a 30% replacement of the cement with WCP and normal mortar without WCP, indicated that the WCP by 700 ℃ thermal treatment had an optimal AI value, which meant WCP treated at 700 ℃ could be used in mortar or concrete as an admixture.

Experimental Research on Main Properties of New Recycled Coarse Aggregate Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 19-23 ◽  
Author(s):  
Da Xing Qian ◽  
Ying Wei Yun ◽  
Ii Young Jang ◽  
Jong Hoe Kim
Keyword(s):  
Concrete Beam ◽  
Coarse Aggregate ◽  
Economic Benefits ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Secondary Process ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Waste Concrete

Recently reutilization of waste concrete becomes one of the hottest issues in civil engineering field throughout the world. However, most of the concerned research focuses on the RCA (recycled coarse aggregate) by simply crushing waste concrete. In this paper shucking technique is developed to secondary process the simply crushing waste concrete for improving the performance of RCA concrete. Test has been done to demonstrate that performances such as strength, elastic modulus et al. of shucking RCA concrete is better than those of common recycled concrete. Simultaneously, beam specimens are made to test the flexural behavior of shucking RCA concrete. Results showed that the deflection of shucking RCA concrete beam is approximately same with that of natural coarse aggregate concrete beam, which solves current problem that recycled aggregate concrete beam has bigger deflection than common concrete beam. The new shucking technique developed in this paper has many advantages to be applied in practical engineering and it has obvious economic benefits and social effect.

Experimental Study on Recycled Concrete Coarse Aggregate Crushed Index

2014 ◽  
Vol 584-586 ◽  
pp. 1750-1755
Author(s):  
Xiao Lei Chang ◽  
Song Gu ◽  
Zhi Zheng
Keyword(s):  
Coarse Aggregate ◽  
Production Quality ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Waste Concrete ◽  
Concrete Materials ◽  
The Stability ◽  
Index Value ◽  
Different Sources

Compared with natural aggregate, recycled aggregate apparent density, bulk density, porosity, water absorption, large crushing index value, which corresponds to aggregate different sources have different indicators, which largely of recycled concrete limits on the application.. In order to more efficiently improve the utilization of recycled aggregate, ensure the stability production quality of recycled concrete, source unknown and difficult to directly measure its intensity of waste concrete materials, at the time of the preparation of recycled aggregate, it is recommended to repeat loading, using different pressures from different standard strength of recycled concrete coarse aggregate crushed curve to use as a criterion to determine the source of their overall strength. Different in different sources of strength recycled aggregate crushing value mainly reflected on the bond strength.

scholarly journals PEMANFAATAN LIMBAH GENTENG BETON PADA PAVING BLOCK

2019 ◽  
Vol 1 (1) ◽  
pp. 36-45
Author(s):  
Pratikto Pratikto ◽  
Ginanjar A
Keyword(s):  
Compressive Strength ◽  
Building Material ◽  
Surface Hardening ◽  
Building Materials ◽  
Coarse Aggregate ◽  
Road Surface ◽  
High Rise ◽  
Waste Concrete ◽  
Constituent Material

Paving block merupakan bahan bangunan yang digunakan sebagai pekerasan permukaan jalan, baik jalan untuk keperluan parkir kendaraan ataupun jalan raya, ataupun untuk keperluan dekoratif pada pembuatan taman. Bahan penyusun paving block adalah semen, pasir dan air dengan atau tanpa bahan tambah lainnya. Bahan tambah yang digunakan dapat berupa limbah atau sisa bahan bangunan yang tidak terpakai. Penggunaan limbah bertujuan untuk mendapatkan mutu paving block sesuai standard dan memanfaatkan limbah secara optimal. Limbah genteng beton banyak ditemukan di sekitar bangunan bertingkat yang sudah lama dan khususnya kampus Politeknik Negeri Jakarta.Limbah ini dapat digunakan sebagai bahan pembentuk paving block sebagai substitusi agregat kasar. Dalam penelitian ini digunakan perbandingan semen dan pasir adalah 1 : 3 dengan presentase limbah genteng beton sebesar 0%, 10%, 20%, 30%, dan 40%. Nilai fas yang digunakan adalah 0,35. Hasil pengujian nilai kuat tekan yang ditinjau pada hari ke 7 pada presentase 0% sebesar 52,59 Mpa, presentase 10% sebesar 44,949 Mpa, presentase 20% sebesar 40,942 Mpa, presentase 30% sebesar 40,685 Mpa dikategorikan mutu A, sedangkan presentase 40% sebesar 26 MPa dikategorikan mutu B.Kata kunci: paving block, Limbah genteng beton, agregat kasar Paving block is a material that is used as a road surface hardening, either for vehicle parking , highways, or for decorative purposes in gardening. The constituent material of paving blocks are cement, sand and water with or without other added material. The added material used can be in the form of waste or residual unused building materials. The use of waste building material of concrete tile aims to get the quality of paving blocks according to standards and utilize waste optimally. Waste concrete roof tiles can be found around many high-rise building constructions and especially Jakarta State Polytechnic campus.This waste can be used as a paving block as a rough aggregate substitute. In this study the ratio of cement and sand was 1: 3 with a percentage of concrete tile waste of 0%, 10%, 20%, 30%, and 40%. The fas value used is 0.35. The testing results of compressive strength which is reviewed on day 7 at a percentage of 0% of 52.59 MPa, 10% of 44.949 MPa, 20% of 40.942 MPa, 30% of 40.658 MPa are categorized as grade A, while at a percentage of 40% the compressive strength is 26 MPa which is categorized as grade B.Keywords: paving block , waste concrete tile, coarse aggregate

On Properties of Recycled Coarse Aggregate from Repeatedly Recycling Waste Concrete

2011 ◽  
Vol 368-373 ◽  
pp. 2185-2188
Author(s):  
Ping Hua Zhu ◽  
Xin Jie Wang ◽  
Jin Cai Feng
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined. In this study, five series of concrete mixtures using coarse and fine natural aggregates were prepared, which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These five concretes were crushed, sieved, washed with water, hot treatmented at 300°C before they were used as recycled aggregates. After that, recycled aggregate concrete (RAC) was produced with an objectively compressive strength of 30MPa, in which the recycled coarse aggregate was used as 30%, 70% and 90% replacements of natural coarse aggregate and recycled fine aggregate as 10%, 20%, and 30% replacements of natural fine aggregate. After that, these recycled concretes were used as second recycled aggregates to produce RAC with the same objectively compressive strength of 30MPa. The physical properties of coarse aggregates including apparent density, water absorption, attached mortar content and crushing value were tested and their mineral characteristics were analyzed. The results showed that the quality of recycled coarse aggregates from twicely recycling waste concrete reached the requirements from structural concrete.

Evaluation of High Grade Recycled Coarse Aggregate Concrete Quality Using Non-Destructive Testing Technique

2015 ◽  
Vol 776 ◽  
pp. 53-58 ◽  
Author(s):  
Ni Nyoman Kencanawati ◽  
Jauhar Fajrin ◽  
Buan Anshari ◽  
Akmaluddin ◽  
Mitsuhiro Shigeishi
Keyword(s):  
Ultrasonic Wave ◽  
Coarse Aggregate ◽  
Surface Hardness ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
High Grade ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Waste Concrete ◽  
Non Destructive

A large amount of waste concrete generates an environmental problem due to demolition of old concrete structures. To solve this problem, it is necessary to collect recycled aggregate from waste concrete. The conventional recycling technique of recycled aggregate from waste concrete does not indicate a significant quality to be re-used for making a new concrete. We proposed new techniques to produce high grade recycled aggregate by heating-grinding (H-G) method and heating-grinding-acid (H-G-A) method. To ensure the quality of the concrete made from recycled coarse aggregate concrete, the non-destructive evaluation was conducted in this research. High grade recycled aggregate concrete were prepared in advanced using two methods mentioned earlier. Then, new concrete specimens were produced using those types of recycled aggregate concrete. After 28 days curing time, rebound hammer test and ultrasonic pulse velocity test were performed on recycled coarse aggregate concrete to examine the surface hardness and ultrasonic wave velocity of the concrete. Almost similar quality to natural coarse aggregate in terms of density, water absorption, sieve analysis achieved by both H-G recycled coarse aggregate and H-G-A recycled coarse aggregate. However, the surface hardness and ultrasonic wave velocity of H-G-A recycled coarse aggregate concrete is better than those of H-G recycled coarse aggregate concrete. That acid solvent enables to dismantle the cement paste from aggregate surface more effectively, so this types of recycled aggregate shows a better performance than the other one. Continued delamination reduces pores in the interfacial transition zone resulting better bonding mechanism between new cement paste and recycled aggregate surface.

scholarly journals Untitled ItemProperties of Concrete Containing Recycled Concrete Aggregate of Preserved Quality

2021 ◽  
Author(s):  
Medhat Shehata ◽  
Jonathan Andal ◽  
Philip Zacarias
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Drying Shrinkage ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
High Quality ◽  
Salt Scaling ◽  
Comparable Quality ◽  
Scaling Resistance

<p>This study focuses on evaluating recycled concrete aggregate (RCA) of high quality produced through a protocol that preserves the original properties of the concrete to be recycled. Concrete with RCA of preserved quality was compared to concrete with commercially available RCA. A total of 29 mixes were tested with RCA replacement ranging from 30% to 100% of the coarse aggregate. Results showed that concrete with RCA of preserved quality performed significantly better in compressive strength, drying shrinkage, and salt scaling resistance. Furthermore, the use of 30% RCA with preserved quality produced concrete of comparable quality to that of concrete with natural aggregate.</p>

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