Sustainability Case Study Review of Using Recycled Aggregate in Road Structure Marlis Foth, P. Eng., LEED® AP, Department of Civil and Geological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, Ph: (306) 966-7007, Fax: (306) 966-5427, [email protected]
• OC (Old Concrete) = concrete particles obtained from demolished concrete structures which can be used as raw material for the production of recycled aggregates. Old concrete is also referred to as original concrete or demolished concrete. • OVA (Original Virgin Aggregate) = initial aggregate used in the manufacture of the original concrete.
AN INTRODUCTION TO RECYCLED AGGREGATE CONCRETE: PRODUCTION AND APPLICATIONS ... depends upon the w/c ratio of the recycled concrete employed. When structures made of concrete are demolished or ...
Strength variation of concrete produced from recycled aggregate is higher than concrete made from natural aggregate. For the recycled aggregate concrete, it would be necessary to add more cement in concrete made with 100% of recycled aggregate in order to achieve the same workability and compression strength as conventional concrete.
Portland-cement concrete produced with natural and coarse recycled aggregates are reported in this paper. The effects of up to 100% coarse recycled concrete aggregate on a range of fresh, engineering and durability properties have been established and assessed its suitability for use in a series of designated applications. 1. Introduction
recycled aggregates. Recycled concrete aggregates: These are the aggregates produced by the crushing of original concrete. These aggregates may be either fine or coarse recycled aggregates. Recycled aggregate concrete : It is the concrete produced by using the recycled (RAC) aggregates or the combination of recycled and natural aggregates.
1.0 Introduction and Background 1.1. his specification provides a mechanism to enable T material providers and users to incorporate inert recycled materials as unbound aggregates in the sub-base and or capping materials of minor highway schemes. A range of schemes is identified in section 3.0 below as an indication only, and may not
11/20/2018 · This method typically involves the use of a redispersible polymer powder to enhance the durability of the resulting recycled aggregate concrete. However, the effects of the amount of polymer on the mechanical and durability properties of recycled ballast aggregate concrete were …
durability. A concrete produced with the combination of PFA and RA i.e. recycled aggregate concrete (RAC) is obviously more sustainable and economical than conventional natural aggregate concrete (NAC). To date, statistics show that a considerable proportion of the world’s RA is used for
inclusion of recycled content, and the introduction of portable, on-site recycling centers. Other options in the recycled aggregate market aside from post-construction concrete or asphalt are constantly being introduced. Post-consumer glass, fiberglass pellets, plastics, even old tires are making a more pronounced presence in the aggregate arena.
and use of recycled aggregate from demolition concrete. Compliance with these criteria is sufficient to ensure that the recycled aggregate may be used as a secondary raw material without the need for waste regulation or control. 1.4. This document indicates how compliance should be demonstrated. 1.5.
aggregate and blended recycled sand are used for concrete kerb and gutter mix in the Lent hall Street project in Sydney. The major advantage is based on the environmental gain. Figure 1.1: Recycled Aggregate 1.2 Historical Background The applications of recycled aggregate in the construction areas are wide and they had been used long time ago ...
AbstractThis Research paper is a live study on the above mentioned title Recycling of Concrete This paper consist the introduction of recycled concrete aggregate with its uses and properties. Various test results on Recycled concrete aggregate also described. It also consist the difference between RCA and natural aggregate.
The information was requested to encompass all engineering aspects highlighted in the previ- ous introduction and background section, primarily in the following categories: (a) aggregate selection process/guidelines for virgin, marginal, nontraditional as well as recycled, and blended aggregate sources; (b) the processes that are followed in ...
1.1 INTRODUCTION An experimental investigation was undertaken to evaluate the performance of a new, composite base course material consisting of the following: (a) recycled crushed concrete aggregate obtained from demolished infrastructure elements, (b) cement and fly ash used as stabilizing
Dec 29, 2017 · This term refers to the center layer of the roadbed. A cross-section of pavement would show dirt, or subgrade, as the lowest of three levels, layered on top by aggregate base course, and finally capped on top by pavement, either concrete or asphalt. This application is widely accepted for recycled concrete by Departments of Transportation.
Construction aggregate, or simply "aggregate", is a broad category of coarse to medium grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world.
• alternative coarse and fine aggregate in place of virgin aggregate in concrete. Through the introduction of templates and a reference case for SCM use, the revised Concrete credit has been streamlined in comparison to the previous approach. INTRODUCTION Background and Outcomes/ Green Star Concrete Credit review /Date Issued: November 2010-- 2
recycled aggregate from concrete waste for higher grades of concrete construction tam wing yan vivian doctor of philosophy city university of hong kong
demolished concrete pavements for use as aggregates in the new concrete pavements. The use of recycled concrete as aggregates (RCA) would help to alleviate several of the concerns presented by the replacement of so many miles of highway. Pavements being demolished could be processed and then used as aggregate in constructing new concrete roadways.
Experimental Study of Compressive Strength of Recycled Aggregate Concrete - written by Yati R. Tank, Jigar P. Parmar, Darpan H. Gadhiya published on 2014/04/25 download full article with reference data and citations
5/15/2015 · Read "Tensile strength behaviour of recycled aggregate concrete, Construction and Building Materials" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
consists of every 20% increment of recycled aggregate replacement from 0% to 100%. Moreover, 100% of recycled aggregate mix batches included fly ash, water/cement ratio of 0.36 and 0.43. The workability of concrete considerably reduced as the amount of recycled aggregate increased. This was evaluated through standard slump test and
INTRODUCTION 1.1 BACKGROUND (a) Recycled aggregate Concrete has been proved to be a leading construction material for more than a century. It is estimated that the global production of concrete is at an annual rate of 1 m3 (approximately 2.5 tonnes) per capita (Neville 2003). The global consumption of
Conventional concrete is a conglomerate of hydraulic (Portland) cement, sand, stone, and water. It was developed approximately 150 years ago to imitate natural stone while providing less labor-intensive methods of shaping the material (i.e., casting rather than hewing and carving).
Jan 10, 2014 · Recyled aggregates (Concrete Technology and Building Materials) 1. RECYCLED AGGREGATES 2. Contents : Introduction Need to Recycle Aggregates Properties Applications Advantages and Disadvantages Recycling Techniques - Two-stage Mixing Approach - Mechanical Scrubbing -Heated Scrubbing Bibliography
Batching Effects on Properties of Recycled Aggregate Concretes for Airfield Rigid Pavements Dr. Andres Salas Prof. David Lange Prof. Jeff Roesler – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3bc2b4-OGYxM
Introduction Method of Test for SIEVE ANALYSIS OF FINE AND COARSE AGGREGATE DOTD Designation: TR 113-11 INTRODUCTION These methods of test are designed to determine the particle size distribution of fine and coarse aggregates. The mix of coarse and fine particles within the material being tested, in conjunction
Mar 22, 2019 · Recycled aggregate concrete is a material, which is eco-friendly and sustainable. Where can recycled aggregate concrete be used: The applications of aggregate concrete without processing include: Its used for many types of general bulk fills. Filling drainage structures. Noise barriers and embankments. Road constructions
recycle this material and can require the use of recycled material in construction. Users of recycled concrete aggregate should take customary precautions to ensure that the material is suitable for the intended application. Usage History and Experience Recycled concrete aggregate has been used in various King County projects over the past twelve
Recycled brick masonry aggregate (RBMA) can be used as a 100% replacement for conventional coarse aggregate in concrete that exhibits acceptable mechanical properties for use in structural and pavement elements. Recycled brick masonry aggregate concrete (RBMAC) is currently not used in any type of construction in the United States.
The states that do use recycled concrete as an aggregate source for new concrete report that concrete with RCA has performed as well as concrete with virgin aggregates. Additionally, the quality of concrete with RCA depends on the quality of the recycled material used.
The concrete aggregate that contains 95% of crushed concrete is called as recycled concrete aggregates. And if the aggregate used in the concrete is 100% crushed, it is called as recycled aggregates. The construction and demolition waste in its original state consists of wood, gypsum, plastics and many contaminating materials, that have to be ...
agencies, have found that the use of recycled aggregate will produce strong durable concrete suitable for PCC pavements in all areas of the United States. According to these studies the mixture produced by utilizing coarse aggregate has no significant effect on mixture proportions or workability when
The goals of this study were to investigate the effects of substituting recycled concrete aggregate (RCA) for natural aggregate (NA) in concrete intended for new portland cement concrete pavements (PCCP), and to investigate the effects of substituting fly ash for portland cement while simultaneously substituting RCA for NA.