In concrete production, Portland cement, river sand, 4-32 mm in size crushed stone and crushed tile as coarse aggregates in the replacement ratio of 0, 50 and 100 % were used. Mechanical and ...
WhatsApp: +86 18221755073
These mortars had partial replacements of the natural fine aggregate (NFA) with recycled fine aggregate (RFA) and carbonated recycled fine aggregate (CRFA) in amounts of 0%, 25%, and 50%.
WhatsApp: +86 18221755073
Researchers investigated concretes comprised of recycled rubber and recycled ceramic aggregates (as a replacement of fine aggregates) and witnessed a rise in the shrinkage with the increment in the replacement level of fine aggregate [116, 117]. The concrete in which 40% of fine aggregates substituted with the granite dust had 3% more drying ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
The recycled fine aggregate from production site HCB was compared to the recycled fine aggregate from demolished HCB. Generally, the recycled fine aggregate exhibited relatively lower physical properties than natural river sand. Gradation, silt content, specific gravity, water absorption capacity, moisture content, and bulk density satisfied ...
WhatsApp: +86 18221755073
Fine aggregates showed the highest number of alternatives and replacement level, with the relevant impact on concrete properties; coarse aggregates, however, always reach a complete replacement ...
WhatsApp: +86 18221755073
Admasu [7] (2015) reported that based on the data from Addis Ababa Environmental Protection Authority in 2005 to 2015, the number of aggregate production plants in the capital has increased from 152 to 257. 2.2 Production of fine aggregate type, quality, production, and quarrying trend and method For central and southeastern part of the country ...
WhatsApp: +86 18221755073
Hossain et al. [47] reported that the production of 1 t of natural aggregates (river sand and crushed stone) emits 23–33 kg CO 2-eq, while the production of 1 t of fRCA from C&DW generates 12 kg CO 2-eq. 2. ... The coarse and fine aggregates are the largest component of concrete. Due to rapidly increasing production and utilization of ...
WhatsApp: +86 18221755073
Concrete is the foremost and widely adopted construction material around the globe. Its worldwide production is about 5.3 billion cubic meters per annum, making it the second most utilized material on earth after water [1].Furthermore, the growing population resulting in increased urbanization is raising the demand for infrastructure which in turn is increasing the …
WhatsApp: +86 18221755073
The production of crushed rock aggregate involves the process of mining known as quarrying and it also has some environmental impacts such as noise pollution as a result of explosives and heavy ...
WhatsApp: +86 18221755073
Fine aggregates are essential components of concrete, which is a widely used construction material for buildings, bridges, roads, and various other structures. Comprising primarily cement, fine aggregates, coarse aggregates, …
WhatsApp: +86 18221755073
Aggregate is an important raw material in the infrastructure construction industry. Aggregate is divided into fine aggregate (commonly known as sand, with a particle size between 0.15-4.75mm) and coarse aggregate (commonly known as stone, with a particle size between 4.75-9.0mm).. The aggregate material is loose and granular in shape and is the basic raw material for producing …
WhatsApp: +86 18221755073
The environmental impact of both fine and coarse aggregate production is now hard to ignore especially on the outskirts of the main cities. These impacts are clearly seen on the degradation of ...
WhatsApp: +86 18221755073
This experimental study was based on the utilization of waste plastic as a partial substitute for natural fine aggregates in cement concrete. ... Journal of Cleaner Production 2012; 23(1): 68-74 ...
WhatsApp: +86 18221755073
The soft deposit consisting of sand, silt, and clay is termed as loam. The purpose of the fine aggregate is to fill the voids in the coarse aggregate and to act as a workability agent. Fine aggregate: Size variation: Coarse Sand. 2.0mm – …
WhatsApp: +86 18221755073
For this purpose, four M20 grade concrete mixes were prepared, substituting natural fine aggregates with plastic fine aggregates (PFA) using 0%, 10%, 15%, and 20% replacement levels.
WhatsApp: +86 18221755073
Lightweight aggregate (LWA) is a kind of porous material, including coarse aggregate with a bulk density of less than 1100 kg/m 3 and fine aggregate with a bulk density of less than 1200 kg/m 3 (Ma et al., 2019). LWA is mainly used to reduce the unit mass of concrete and to increase the thermal insulation of buildings.
WhatsApp: +86 18221755073
Fine aggregate plays a pivotal role in the construction industry, especially in the production of concrete and mortar. Its quality, size, and type significantly influence the durability and strength of structures.
WhatsApp: +86 18221755073
The increase in the demand for concrete production for the development of infrastructures in developing countries like Ethiopia leads to the depletion of aggregates and high cement demand, which imposes negative environmental impacts. In sustainable development, there is a need for construction materials to focus on the economy, efficient …
WhatsApp: +86 18221755073
Researches mentioned in this article involve replacing fine aggregates (natural sand) by recycled aggregate or dune sands and finding the effect of clay content on workability of concrete.
WhatsApp: +86 18221755073
Table 1 shows the specific gravity of fine aggregates used in the production of concrete. Natural fine aggregates from two quarries supply recorded a maximum specific gravity with an average value of 2.644, followed by crushed supply with an average value of 2.625. On the other hand, fine aggregates
WhatsApp: +86 18221755073
Fine aggregates are smaller particles. They have a diameter of less than 4.75 millimeters (the size range is typically 0.075 mm to 4.75 mm). For example: sand. They are typically made of crushed stone, natural sand, or …
WhatsApp: +86 18221755073
In concrete, fine aggregates and coarse aggregates make up about 75% of the total concrete materials. It is, therefore, significantly important to acquire the right type and quality of aggregates at the site. The aggregates from the main matrix of the concrete/mortar. The aggregate particles are glued together by the cement & water paste. There…
WhatsApp: +86 18221755073
In concrete production, fine aggregate materials are combined with cement, water, and other ingredients to form a strong, durable material that is used in a …
WhatsApp: +86 18221755073
Coarse Aggregates (CA) Coarse aggregates ranging from 20mm to 4.75mm was procured from a local quarry. As per IS 2386-1988 part-3 [9] properties of coarse aggregates was determined and represented in Table 1. Table 1: Properties of coarse aggregate Features of aggregates Obtained values Fineness Modulus 5.13 Specific gravity 2.65
WhatsApp: +86 18221755073
tion of aggregates; subsequent sections will cover sources and production processes necessary to produce aggregate materials and the sampling tech-niques required to obtain representative results. Origin Many properties of an aggregate derive from its parent rock: physical and mechanical properties such as relative density, strength, stiffness ...
WhatsApp: +86 18221755073
Assessment of natural sand being used as fine aggregate for concrete production in Ibadan and its environs was carried out. Ten sources (F1 – F10) were selected for the study; four (F5, F6, F7 ...
WhatsApp: +86 18221755073
Aggregates, which represent 60 to 75 percent of the aggregate volume of cement, are separated into two unmistakable classifications -fine and coarse. Fine Aggregates for the most part comprise of characteristic sand or smashed stone with most particles going through a 3/8-inch strainer.
WhatsApp: +86 18221755073
Durability is the ability of concrete structures to resist various types of internal or external deterioration and maintain serviceability over the long-term serving [18, [21], [22], [23]].The durability of recycled aggregate concrete is generally inferior to that of natural aggregate concrete because of the adhered porous mortar on the surface of recycled aggregates [24, 25].
WhatsApp: +86 18221755073