-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
With the increasing demand for sustainability and the ecological environment, recycled wastes have been increasingly used in concrete production. Fly ash (FA) and recycled coarse aggregate (RCA) are two common types of waste widely used to replace ordinary Portland cement (OPC) and natural coarse aggregate (NCA), respectively.
به خواندن ادامه دهید
However, using a recycled aggregate of more than 65% can impact the mix's durability significantly, reducing its physical properties tenfold. The optimum amount blended in with the concrete should be 35%. Some experiments have shown that the recycled aggregate is durable, no doubt, but not as sturdy as natural coarse aggregate.
به خواندن ادامه دهید
The states that do use recycled concrete aggregate (RCA) in new concrete report that concrete with RCA performs equal to concrete with natural aggregates. Most agencies specify using the material directly in the project that is being reconstructed. Recycling of concrete is a relatively simple process.
به خواندن ادامه دهید
The use of recycled concrete aggregate (RCA) in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for ...
به خواندن ادامه دهید
Recycled Tires as Coarse Aggregate in Concrete Pavement Mixtures Final Report Submitted by Rui Liu, Ph.D., P.E. University of Colorado Denver Department of Civil Engineering College of Engineering and Applied Science Campus Box 113, P.O. Box 173364 Denver, CO. 80217-3364 Telephone: (303) 556-5270 Fax: (303) 556-2368
به خواندن ادامه دهید
In this research, recycled concrete aggregates (RCA) from site-tested concrete specimens were used. These consist of 28-days concrete cubes after compression test obtained from a local construction site. These concrete cubes are crushed to suitable size and reused as recycled coarse aggregate. The amount of recycled concrete aggregate used in this research is approximately 200 kg.
به خواندن ادامه دهید
4.3.6 Coarse recycled aggregate (RA) Where coarse RA is specified, its use in concrete shall be assessed on a case-by-case basis taking into account its specific composition. The minimum requirements of coarse RA in accordance with BS EN 12620 shall be as given in Table 4.
به خواندن ادامه دهید
cement concrete produced with natural and coarse recycled aggregates; it presents the suitability for use in a series of designated applications based on the effects of recycled concrete aggregate replacement (up to ) on physical and engineering properties [3]. Another study focusing on the strength of recycled concrete as
به خواندن ادامه دهید
The use of recycled aggregate does not gravely affect the compressive strength of the concrete. Using 60 % of recycled coarse aggregate in concrete mixes shows comparatively better compressive strength than conventional aggregate concrete in M30 mix and also shows appreciable results in M20 mix with same percentage replacement.The behavior of ...
به خواندن ادامه دهید
The use of recycled aggregate in replacing the normal coarse aggregates in concrete construction has become popular among researchers (Abdul Rahman et al., 2009), recycled concrete aggregate ...
به خواندن ادامه دهید
Reusing these concrete wastes will help in saving landfill spaces in addition to more sustainability in natural resources. The objective of this study is to investigate the possibility of using old recycled concrete as coarse aggregate to make new concrete mixes, and its effect on the evolution of the compressive strength of the new concrete mixes.
به خواندن ادامه دهید
The produced coarse recycled concrete aggregate is sent to a rotary kiln for calcination, which can burn the combustible impurities into ashes. The calcined aggregate is then ground into powder by ball mills and Raymond mills. The calcination treatment method removes the combustibles in the recycled concrete aggregate and reduces the moisture ...
به خواندن ادامه دهید
Recycling of concrete is a simple process. It involves breaking, removing, and crushing existing concrete into a material with a specified size and quality. As per study about 75 to 80% of total construction material consist coarse aggregate portion. When the structure is demolished, the waste concrete in a large quantity is produced.
به خواندن ادامه دهید
after compression test obtained from a local construction site. These concrete cubes are crushed to suitable size and reused as recycled coarse aggregate. The amount of recycled concrete aggregate used in this research is approximately 200 kg. Many researchers state that recycled aggregates are only suitable for non-structural concrete application.
به خواندن ادامه دهید
The use of recycled concrete aggregate (RCA) in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for ...
به خواندن ادامه دهید
It is called recycled aggregate which can be produced by concrete crusher. The aggregates are categorized by size as coarse and fine aggregate. The characteristic of recycled aggregates could be different by its parent concrete because the parent concrete was designed for its purposes such as permeable, durable and high strength concrete
به خواندن ادامه دهید
By using this technique, the quality of the coarse aggregate separated and collected from concrete test specimens is comparable to that of coarse aggregate recycled by heating and grinding methods, thus satisfying the criteria in Japan Industrial Standard (JIS) A 5021 for the oven-dry density and the water absorption of coarse aggregate by ...
به خواندن ادامه دهید
This paper presents guidelines for using recycled-concrete aggregate (RCA) as a full or partial replacement for natural coarse aggregate in new concrete (RCA concrete). Several international standards and guidelines for the use of RCA in concrete are reviewed and contrasted to identify areas in which further development is required.
به خواندن ادامه دهید
Utilization of recycled concrete aggregates as a total replacement of granite aggregate in porous asphalt mixtures was investigated by Chen and Wong . In this research, Draindown, Cantabro, Marshal, permeability, and ageing tests were carried out to evaluate the performance of the porous asphalt mixtures.
به خواندن ادامه دهید
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): ABSTRACT: Utilization of Recycled Aggregate in concrete has been employed due to awareness of society in natural resources protection. The application of Recycled Aggregate (RA) as coarse aggregate in concrete mixes has been iniated as to make use effectively the waste materials.
به خواندن ادامه دهید
Synopsis. The effects of using crushed concrete as coarse and fine aggregates upon strength and deformation of concrete are reported. The properties of recycled aggregates differ from those of natural aggregates due to the presence of a considerable proportion of mortar attached natural aggregate …
به خواندن ادامه دهید
the two. Later, recycled aggregates were introduced in concrete mixes. In these mixes, natural coarse aggregate was partly or totally replaced by recycled aggregates. Results showed that the use of recycled aggregates has an adverse effect on the workability of concrete. Such an effect can be easily retained by using plasticizers.
به خواندن ادامه دهید
The use of recycled coarse aggregates in printable concrete formulations can provide opportunities for a circular economy and help in improving the sustainability of 3D printable mixtures [24,30,31]. In the current study, we examine the influence of natural and recycled coarse aggregates on the fresh and hardened properties of 3D printable ...
به خواندن ادامه دهید
Beneficial Utilization of Recycled Asphaltic Concrete Aggregate in High Calcium Fly Ash Geopolymer Concrete. In this paper, the utilization of recycled asphaltic concrete aggregate (RACA) in high calcium fly ash geopolymer concrete (HFGC) was explored. Coarse limestone aggregate was replaced with RACA at 0, 20, and 40 %by weight of the aggregate.
به خواندن ادامه دهید
This experimental study deals with utilization of Coarse Recycled Concrete Aggregate (CRCA) and Fine Recycled Concrete Aggregates (FRCA) in Self compacting concrete (SCC) mixes. The concrete mix is designed for target strength of 40 MPa as per "Modified Nan-su Method", with Fly Ash as mineral admixture. Four mixes are considered in the ...
به خواندن ادامه دهید
recycled aggregate concrete is lower than that of the natural aggregate concrete, it still lies within the usable range and hence can be used in structural concrete. Keywords— Recycled Aggregates, Recycled Aggregate Concrete (RAC), Natural Aggregate Concrete (NAC), Compressive Strength, etc… I. INTRODUCTION
به خواندن ادامه دهید
This study evaluated the use of recycled concrete as coarse aggregate in new concrete pavements. Recycled concrete aggregate (RCA) produced from demolished pavements in three geographically-dispersed locations in Washington state were used to perform testson aggregate characte ristics, fresh concrete propertiesand hardened concrete properties.
به خواندن ادامه دهید
The use of recycled concrete aggregate (RCA) in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for aggregate.
به خواندن ادامه دهید
Therefore, the use of superplasticizers in high-quality recycled aggregates concrete is highly recommended, leading to excellent performances. The coarse recycled aggregates generated from precast elements and the use of superplasticizers open new perspectives for recycled aggregates concrete, enabling the production of high-performance concrete.
به خواندن ادامه دهید
concrete can be useful for environment protection. Recycled aggregates are the materials for the future. Many countries are giving infrastructural laws relaxation for increasing the use of recycled aggregate. The use of marble chips as coarse aggregate in concrete reduces the amount of natural aggregate required.
به خواندن ادامه دهید
strength of conventional concrete and crushed stone aggregate concrete. The strength of the concrete with different coarse aggregates is given in Table 3. The compressive strength of concrete cubes made with ceramic insulator and glass concrete were found to be 16% and 26.34 % lesser respectively than that of conventional concrete.
به خواندن ادامه دهید
recycled aggregate concrete (RCA) as a substitute for coarse aggregate in the compressive strength of `plain concrete and concluded the use of recycled concrete aggregates (RCA) as alternative to natural or aggregate in structural concrete reduces the strength development of the concrete.
به خواندن ادامه دهید