Among the techniques for converting stacked coal gangue to reusable material, one of the most effective ways is to use coal gangue as a coarse aggregate in green concrete productions. The physical and chemical properties of rock and spontaneous-combustion coal gangue are generally suitable for being used as a coarse …
@article{Etxeberria2007InfluenceOA, title={Influence of Amount of Recycled Coarse Aggregates and Production Process on Properties of Recycled Aggregate Concrete}, author={Miren Etxeberria and Enric V{'a}zquez and Antonio Mar{'i} and M. Barra}, journal={Cement and Concrete Research}, year={2007}, volume={37}, …
The production of aggregate for the infrastructural development of the country has been increasing for the last three decades due to the high urbanization rates in the main cities of the country and …
Construction aggregates are produced from naturally occurring mineral deposits, including solid rock formations such as limestone and granite, and from loose deposits of sand and gravel. The most common structural …
Grading of aggregate: Bulk density is obtained from procedure IS 2386 (PART III)-1963, which is under ASTM C330-99: Table 2, Particle Size Distribution Curves for RPSCA 1:1, RPSCA 1:2, RPRDCA 1: 1, and 1:2 RPRDCA is made for two types of aggregates, The first is a single-size aggregate and the second is a well-graded …
Local mining sand with a maximum size of 4.75 mm and specific gravity of 2.68, was used as fine aggregate.The locally collected materials of OPBC and OPS, as shown in Fig. 1, were used as coarse aggregates.The OPS aggregates were washed with detergent to remove the dust and the oil coating from the surface and dried in the …
During processing, aggregates are distilled down to a level of their most common use. Some aggregates may be crushed to a powder while others may be screened to various diameter chunks. The proper processing of aggregates is important in maintaining their desirable qualities. For …
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%, …
Lightweight aggregate is a type of coarse aggregate that is used in the production of lightweight concrete products such as concrete block, structural concrete, and …
In the manufacturing process, the same method was used for all of the concretes. First, the coarse aggregates are introduced in the mixer. Then, the fine aggregates are introduced with 50% of the total amount of water (by mixing water and the absorption water) for 5 min. Second, the cement is added to the mixer with 50% of the …
Previous research [38] demonstrated that the autoclaving process, in which the steel slag samples were subjected to steam at 2.1 MPa and 216 ℃ for three hours, hydrated nearly all expansive oxides, including f-CaO and periclase, in steel slag. This finding suggests that implementing an autoclave treatment with appropriate heat …
Concrete is a mixture which is composed of materials like cement, fine aggregates (sand) and coarse aggregates mixed with water which hardens with time. Concrete is the main material for 90% of construction works. There are many types of concrete based on the the materials used in the mixture during manufacturing process …
The quantities of coarse aggregate and fine aggre-gate manufactured by this process are shown in Table 3. When approximately 410t of solidified slag was crushed, it was possible to manufacture 351t of coarse aggregate. Thus, the yield ratio was 86%. The particle size distribution of the coarse aggregate is shown in Fig. 6. The developed product ...
An experimental study is made on the utilization of E-waste particles as fine and coarse aggregates in concrete with a percentage replacement ranging from 0%, 20% to 30% i.e. (0%, 10%, 20% and 30%) on the strength criteria of M20 Concrete. Compressive strength, Tensile strength and Flexural strength Concrete with and without E- waste …
2.1. Production of Steel Slag. Slags of various types account for approximately 90% (by mass) of the byproducts discharged from the crude steel smelting process; the others are gas, dust, and sludge [].Figure 2 presents the crude steel smelting process. According to the difference in crude steel smelting processes, steel slag can …
Aggregate crushing is the process of breaking down the large pieces into smaller particles. ... Progression in the production of aggregates has also enabled us to be more sustainable, ensuring full circularity in the construction process. ... Aggregates, both fine and coarse, constitute about 60 -80% of the concrete formula. ...
oxidizing slag in place of coarse aggregate resulted in increases in compressive strength of 11.1%, split tensile strength of 4.9%, and ex- ural strength of 12.2%, respectively [23] .
11.20.1 Process Description1,2. Lightweight aggregate is a type of coarse aggregate that is used in the production of lightweight concrete products such as concrete block, structural concrete, and pavement. The Standard Industrial Classification (SIC) code for lightweight aggregate manufacturing is 3295; there currently is no Source ...
In the manufacturing of coarse aggregates, the edges and corners of each coarse aggregate particle produced by mechanical crushing vary a lot. ... Meanwhile the high-efficiency manufacturing process is designed to realize large-scale industrial production through direct additive preparation or indirect casting. 2.4. Preparation of 3D …
Now, suppose a site is using a concrete where the unit content of water, cement, sand and coarse aggregate are 180kg/m 3, 360kg/m 3, 700kg/m 3, 1210kg/m 3 respectively for a portion of work the engineer permits volume batching and rectangular box is measuring 35x45cm 2 have to be fabricated to measure the coarse aggregate. …
Often the coarse aggregates are replaced with LWA and the fine aggregates will be the same normal density aggregates. This lightweight concrete is not only reduced weight but have better insulation properties against heat and sound. ... (<15%) level for the production of expanded clay aggregates. A flowchart of the …
"Information in a nutshell and Fig. 3 (a)–(d) shows a microstructural study of aggregate mixture samples made with 1:1,1:2,1:1,1;2 plastic sand and rock dust aggregate using SEM imaging". In the case of rock dust, the recycled plastic is strongly bonded due to the small size of the particles, indicating that rock dust In comparison to other materials, …
Five concrete mixes were produced with a water/cement ratio (w/c) of 0.5 and other five mixes with a w/c of 0.7. Five replacement rates of coarse aggregate by recycled coarse aggregate (%R) were used: 0, 25, 50, 75, and . OPC was used in all mixtures, and its production process was considered independently from the rest of …
Production of High-Quality Coarse Recycled Aggregates through a Two-Stage Jigging Process. Viviane L. S. Gschwenter 1, Rejane M. C. Tubino 1, Weslei M. Ambrós 2, Gerson L. Miltzarek 2, Carlos Hoffmann Sampaio 3,*, Josep Oliva Moncunill 3, Bogdan Grigore Cazacliu 4 and Denise C. C. Dal Molin 5.
Cement and Concrete Research 37 (2007) 735 – 742 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, …
2.2 Mix Proportions. For the production of lightweight concrete, the traditional coarse aggregate was partially replaced with LDA (pellets) and fly ash aggregates at 10, 20, 30, 40, and 50%. The 7th and 28th-day compressive strength of the cubes cast with this concrete was found out for different replacement percentage as …
This rigorous experimentation not only refines the manufacturing process but also contributes significantly to the overall efficacy and reliability of recycled coarse aggregates in construction projects. ... A Study on Recycled Coarse Aggregate as a Full or Partial Replacement of Coarse Aggregate in Concrete Production using high FM …
This chapter aims to review various production processes of artificial lightweight aggregates and the influence of the processing condition on the properties …
Besides Ni slag, the use of Cu slags as a replacement for coarse aggregate, fine aggregate and sand have also been well-researched ... It also presents additional results showing the effects of the sintering treatment involved in the aggregate manufacturing process compared to the original milled MIBA (Cheeseman et al., 2005).
Recycled aggregates and particularly, recycled concrete aggregate substantially affect the properties and mix design of concrete both at. fresh and hardened states since it is known by high ...
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 ...
19.2.1 Recycled concrete aggregate (RCA) Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006). In designated concrete RC20/25 to RC40/50, RCA can automatically ...
Holcim aggregates for urban drainage systems are designed to control water flow in public roads, sidewalks and driveways for enhanced road safety. Environmentally friendly, these solutions allow for rainwater management and aid the collection, cleaning and reuse of rainwater. Discover Holcim's aggregates and solutions — a full range of ...
Aggregates' size classification, (a) fine aggregates and (b) coarse aggregates. Manufacturing process of the normal aggregates include the following steps: Step 1: …
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 ...
Manufactured aggregate: Manufactured coarse and fine aggregates are produced by crushing sound parent rocks by stone crushing machines. Manufactured aggregates …
The shape of coarse aggregate is an important factor determining the performance of concrete, and it also affects the whole mixing process. This article selected four typical coarse aggregates and simulated the motion behavior of the coarse aggregate and mortar in a dual horizontal axis mixer using discrete element software, …