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technical paper quality improvement of recycled concrete

technical paper quality improvement of recycled concrete

Technical Paper Quality improvement of recycled concrete ...

Technical Paper. Quality improvement of recycled concrete aggregate by a large-scale tube mill with steel rod. ... recycled concrete aggregate, tube mill, steel rod, revolution count, contacted surface area, mass. ... Test results offer the technical insight regarding the

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Quality Improvement Techniques for Recycled Concrete ...

Scientific paper Quality Improvement Techniques for Recycled Concrete Aggregate: A review Wafaa Mohamed Shaban1, ... in terms of their technical feasibility, efficiency, economic and environmental impacts, are also discussed, in view of facilitating the selection of the most suitable treatment method for RCA. ... Using recycled concrete ...

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Quality Improvement Techniques for Recycled Concrete ...

The purpose of the work reported in this paper is to assess the performance of Recycled Ultra High Durability Concrete (R-UHDC), produced using different fractions of recycled aggregate obtained ...

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Quality Improvement Techniques for Recycled Concrete ...

Quality Improvement Techniques for Recycled Concrete Aggregate: A review. Wafaa Mohamed Shaban, Jian Yang, ... The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. ... in terms of their technical feasibility, efficiency ...

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THE IMPROVEMENT OF RECYCLED CONCRETE AGGREGATE A

This paper reviews the published improvement methods for recycled concrete aggregate, and points out their advantages and disadvantages so as to facilitate the selection and further development of suitable enhancement methods for recycled concrete aggregate. Keywords: recycled concrete aggregate, adhered cement mortar, improvement 1. INTRODUCTION

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Treatment Methods for the Quality Improvement of Recycled ...

for the purpose of providing references for further research and practical application about the quality improvement of RCA, in this paper, various treatment methods were firstly classified into four categories: removing old mortar (OM), strengthening OM, multi-stage mixing methods, and combination methods. Thereafter, the improvement mechanisms and important conclusions of various treatment ...

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(PDF) Influence of the Quality of Recycled Aggregates on ...

Microstructure analysis of hardened recycled aggregate 4 concrete. Mag Concr Res 2006;58:683–90. 5 [9] Limbachiya M, Meddah MS, Ouchagour Y. Use of recycled concrete aggregate in fly-ash 6 concrete. Constr Build Mater 2011;27:439–49. 7 [10] Poon CS, Kou SC. Properties of steam cured recycled aggregate concrete.

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Quality improvement of recycled aggregates using the acid ...

Apr 15, 2016  Ministry of Construction and Transportation (2008) Act on the Quality of Recycled Aggregate, Ministry of Construction and Transportation Announcement 2008-93, pp 19–25. 2. Song H, Shin H-U, Lee J-K, Chu Y-S, Park D-C (2014) Image and phase analysis of low carbon type recycled cement using waste concrete powder.

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Recycled Concrete: The Pros and Cons - Braen Stone

Recycled Concrete Aggregate (RCA) is one of the most commonly used recycled construction materials in NJ and its surrounding areas. The material can be used for a wide range of practical purposes. If you’ve been wondering if recycled concrete could be the right solution for your upcoming project, you likely have questions about the benefits ...

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Construction and Demolition Waste Management and

CDW recycling. 1.1.2 Scope of Technical Assistance Study ... and concerns over the quality assurance of recycled materials. CDW recycling centres have been established in several cities in the PRC, but these ... cities that have made significant improvement in CDW management and recycling

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Sustainability of Concrete Construction Practice ...

May 02, 2008  Sustainable concrete should have a very low inherent energy requirement, be produced with little waste, be made from some of the most plentiful resources on earth, produce durable structures, have a very high thermal mass, and be made with recycled materials. Sustainable constructions have a small impact on the environment.

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Use of RECYCLED AGGREGATES In CONCRETE- A Paradigm Shift

Since the enormous quantity of concrete is available for recycling from demolished concrete structures, field demolished concrete is used in the present study to produce the recycled aggregates. The concrete debris were collected from different (four) sources with the age ranging from 2 to 40 years old and broken into the pieces of ...

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Microstructural analysis of recycled aggregate concrete ...

Jun 01, 2005  Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set-up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate.

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Literature Review on Sustainable Concrete

emissions and a typical cubic yard (0.7643 m3) of concrete contains about 10% by weight of cement. A cubic yard of concrete weighs about 2 tons, CO 2 an emission from 1 ton of concrete varies between 0.05 to 0.13 tons. Approximately 95% of all CO 2-emissions from a cubic yard of concrete are from cement manufacturing. [1]

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Durability Studies on the Recycled Aggregate Concrete in ...

Jul 28, 2019  Since China hosted the Olympic Games in 2008, a mass of construction and demolition (CD) wastes were produced with the rapid urbanization construction. Recycling the CD waste into recycled aggregates (RA) is an effective method for reducing the amount of CD wastes. Many studies on the properties of RA and the durability of recycled aggregate concrete (RAC) were conducted in

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Application of Conventionally Recycled Coarse Aggregate to ...

In this paper, material tests were conducted on recycled aggregates with low quality and middle quality. In the test, two types of surface improving agent, an oil-type improving agent and a silane ...

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Recycling of concrete in new structural concrete

Concrete waste as crushed concrete aggregates (CCA) in structural concrete gives a new purpose and prolongs the technical life of the reference concrete accomplishing closed loop recycling. This research investigates CCA as aggregate replacement in an industrial reference concrete recipe as fine aggregate fractions and overall aggregate ...

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Evaluation of the Influence of Specific Surface Treatments ...

High water absorption of recycled brick aggregate (RBA) is one of the most discussed parameters in terms of its application in the production of concrete-its influence on the amount of mixing water and, hence, the quality of the concrete, is usually considered negative. In this paper, different meth

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Technical Assignment 1: Construction Project Management

Technical Assignment 1 summarizes the existing conditions and construction management methods utilized on The Salamander Resort and Spa. ... Construction Recycling: All recycling is collected on site and removed by a third party company to a local recycling plant. ... XCast in place concrete Crane and bucket placement.

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Waste Materials in Concrete Technology: Sustainability and ...

Technical improvement . When concrete shows high fluidity, in addition to good cohesiveness, it is said to be self-compacting. This recent achievement of concrete technology, which has lead to several advantages, is in fact a development of the well-known rheo-plastic concrete

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Studies on thermo-chemical treatment of recycled concrete ...

Apr 05, 2017  The presence of cement paste is the most important factor affecting the quality of recycled concrete fine aggregates. This study aims to develop the thermo-chemical treatment for the purpose of removal of the cement paste adhering to recycled concrete fine aggregates. This study involves assessing the effectiveness of thermo-chemical treatment and comparing its efficiency with

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Recycling of concrete in new structural concrete

Concrete waste as crushed concrete aggregates (CCA) in structural concrete gives a new purpose and prolongs the technical life of the reference concrete accomplishing closed loop recycling. This research investigates CCA as aggregate replacement in an industrial reference concrete recipe as fine aggregate fractions and overall aggregate ...

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Journal of Advanced Concrete Technology

Quality Improvement Techniques for Recycled Concrete Aggregate: A review ... and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). ... This early state of concrete affects the long-term concrete performance. In the present paper the displacement distribution of fresh cementitious material from plastic ...

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Construction and Demolition Waste Management and

CDW recycling. 1.1.2 Scope of Technical Assistance Study ... and concerns over the quality assurance of recycled materials. CDW recycling centres have been established in several cities in the PRC, but these ... cities that have made significant improvement in CDW management and recycling

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Recycled Aggregates - Portland Cement Association

The quality of concrete with RCA is very dependent on the quality of the recycled material used. Reinforcing steel and other embedded items, if any, must be removed, and care must be taken to prevent contamination by other materials that can be troublesome, such as asphalt, soil and clay balls, chlorides, glass, gypsum board, sealants, paper ...

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Recycled Concrete: The Advantages It Offers Your Project

Recycled concrete is a newly popular material for contractors. If you have ever wondered what happens to all of the leftover concrete after a building is torn down, recycled concrete is your answer. In the past, the waste from this type of demolition would end up in a

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Technical Assignment 1: Construction Project Management

Technical Assignment 1 summarizes the existing conditions and construction management methods utilized on The Salamander Resort and Spa. ... Construction Recycling: All recycling is collected on site and removed by a third party company to a local recycling plant. ... XCast in place concrete Crane and bucket placement.

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Literature Review on Sustainable Concrete

emissions and a typical cubic yard (0.7643 m3) of concrete contains about 10% by weight of cement. A cubic yard of concrete weighs about 2 tons, CO 2 an emission from 1 ton of concrete varies between 0.05 to 0.13 tons. Approximately 95% of all CO 2-emissions from a cubic yard of concrete are from cement manufacturing. [1]

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(PDF) Recycling and Reuse of Construction and Demolition ...

found that there is a improvement ... plastics, metals), produce average to high-quality recycled concrete aggregates. ... companies, and technologies and the technical trends were discussed in ...

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Suitability Investigation of Recycled Concrete Aggregates ...

Sep 30, 2018  In developing countries, construction and demolition waste (CDW) is disposed to landfill, causing social, environmental, and economic crises. In these nations, CDW exponentially increase due to their rapid economic growth, industrialization, and urbanization. This paper aims to examine the possibility of recycling concrete waste for production of new concrete in Ethiopia.

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CONCRETE BASICS A Guide to Concrete Practice

Despite the common usage of concrete, few people are aware of the considerations involved in designing strong, durable, high quality concrete. Concrete Basicsaims to provide a clear, concise explanation of all aspects of making quality concrete; from the Materials and Properties involved through Planning, Preparation, Finishing and Curing.

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American Concrete Institute

The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.

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Study on Frost Resistance of Recycled Aggregate Concrete ...

Oct 14, 2020  Find my institution. Log in / Register. 0 Cart

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