The result of sieve analysis carried out as per IS 2386 for different types of crushed recycled concrete aggregate and natural aggregates. It is found that recycled coarse aggregate are reduced to various sizes during the process of crushing and sieving (by a sieve of …
The natural coarse aggregate was crushed limestone with sizes of 5–10 mm and 10–20 mm, which were denoted as NA1# and NA2# respectively. Recycled coarse aggregate was derived from the parent concrete with the 28-days compressive strength of 40–60 MPa and over 4 months curing time at least.
the properties of recycled coarse aggregates and recycled fine aggregates which always contains a much higher proportion of adhered mortar. Therefore, the original concrete, the recycling . process and the size fraction are the three most important issues that should be controlled when producing recycled concrete aggregates.
Shear strength of recycled aggregate concrete is lesser than of normal concrete. This is because the recycled aggregate from field-demolished concrete for example can be relatively weaker than a typical natural aggregate. In general, there is a 10% decrease in strength when recycled coarse aggregates are used. Uses of Crushed Concrete Aggregates
Mar 29, 2013· After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is created after the mortar is separated from the …
4.2. Mechanical properties of recycled aggregate concrete. Concrete made with of recycled coarse aggregates has 20–25% less compression strength than conventional concrete at 28 days, with the same effective w/c ratio (w/c = 0.50) and cement quantity (325 kg of cement/m 3).
Grade 1 recycled aggregate concrete has a maximum specified strength limit of 40 MPa. – Grade 2 recycled aggregate concrete is allowed up to substitution level of Class 1A or Class 1B recycled concrete coarse aggregate. Grade 2 recycled aggregate concrete …
properties of recycled fine aggregate and recycled coarse aggregate & also compares these properties with natural aggregates. Basic changes in all aggregate properties are determined and their effects on concreting work are discussed at length. Similarly the properties of recycled aggregate concrete are also determined. Basic
Properties of recycled aggregate concrete prepared with scattering-filling coarse aggregate process. Cement and Concrete Composites, volume 93 (2018) page 19–29. Go To Cement and Concrete Composites, volume 93 (2018)
In general, the reuse and recycle of construction waste is concentrated in the preparation of recycled aggregate for concrete. By adding a portion of recycled aggregate instead of natural aggregate coarse into the mixture, producing the recycled concrete, which can conserve energy and materials for …
It has been observed that the recycled coarse aggregate is used as normal aggregate. The workability of the concrete is increased by using RCA. Maximum properties of Recycled coarse aggregate have shown good with a little variation. Recycled aggregate materials produce harsh mixes with lower workability than Natural aggregates.
Influence of Amount of Recycled Coarse Aggregates and Production Process on Properties of Recycled Aggregate Concrete. In this study recycled coarse aggregates obtained by crushed concrete were used for concrete production. Four different recycled aggregate concretes were produced; made with 0%, 25%, 50% and of recycled coarse aggregates ...
Recycled Aggregates () — Construction materials are increasingly judged by their ecological characteristics. Concrete recycling gains importance because it protects natural resources and eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or pavement sub-base layers.
May 01, 2007· Read "Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete, Cement and Concrete Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at …
Nov 15, 2014· 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
Apr 10, 2019· Properties of recycled aggregate concrete prepared with scattering-filling coarse aggregate process. Cement and Concrete Composites, volume 93 (2018) page 19–29. Go To Cement and Concrete Composites, volume 93 (2018)
A loading crushing test of recycled mixed coarse aggregates in the same particle diameter range is carried out, and the crushed coarse aggregates are screened, manually sorted, and weighed to study the crushing characteristics of recycled mixed coarse aggregates. The results show that the effect of "reinforcing the strong and discarding the weak” exists between two types of recycled ...
"Recycled Coarse Aggregates" International Journal of Advanced Technology in Civil Engineering, ISSN: 2231 –5721, Volume-2, Issue-1, 2013 29 no 2 below shows the washing process for coarse aggregates by a pressure system. Figure 2 Washing of RCA Figure 3 Drying of RCA 2.4.2 Heating : The RCA were then heated in an oven at
Because recycled aggregate contains mortar from the original concrete, it is more porous and absorptive than many natural aggregates. Recycled aggregate had water absorption of 9.6%. The workability of concrete, as the amount of recycled aggregate was increased, the concrete required more water to maintain adequate
properties of recycled aggregate are much more pro-nounced than as is the case with natural aggregates. Figure 2. Appearance of the recycled aggregate grains  2.1. Aggregate grading Grading of recycled coarse aggregate normally satisfies the standards for natural aggrega-te, while in the case of recycled fine aggregate,
Present investigations deal with the development of green concrete (M 30 grade) using recycled coarse aggregates for sustainable development. Characterization of recycled coarse aggregates showed that physical and mechanical properties are of inferior quality and improvement in properties was observed after washing due to removal of old weak mortar adhered on its surface.
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.
Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete Article in Cement and Concrete Research 37(5):735-742 · May 2007 with 541 Reads
A number of manufactured and recycled aggregates are readily available in certain localities. Air-cooled blast furnace slag (BFS) and manufactured sand are two good examples of concrete coarse and fine aggregates. Comprehensive performance data are available for air-cooled blast furnace slag and work is continuing to obtain performance data and
Aug 23, 2019· Application of Recycled Structural Concrete to Replace of Coarse Aggregate under the Building Control Laws and Construction Standards - written by Punkorn Cheewawutwatanawit, Dr. Waranon Kongsong, Dr. Krisda Bisalyaputra published on 2019/08/23 download full article with reference data and citations
1. In their study, they use recycled coarse aggregates obtained by crushed concrete for concrete production. 2. Four different recycled aggregate concretes were produced; made with 0%, 25%, 50% and of recycled coarse aggregates, respectively. 3. The mix proportions of the four concretes were designed in order to achieve the same
Recycled Coarse Aggregate Process. manufacturing process of coarse aggregate - diyafc. The recycled coarse aggregate originating from precast floor elements could possibly be . Quality test of manufacturing process management for recycling coarse . Get Price And Support Online; 1 Influence of Amount of Recycled Coarse Aggregates .
Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete M. Etxeberria⁎, E. Vázquez, A. Marí, M. Barra Universitat Politécnica de Catalunya (UPC), Department of Construction Engineering, Faculty of Civil Engineering, 08034 Barcelona, Spain