Call us today Prefer a callback? Why Are Aggregates Used in Concrete? Posted on 21st December by Hintons As one of the main ingredients in concrete, the aggregates you use will influence the overall properties of the mix — from consistency and workability to strength and durability. Workability Workability of concrete mix refers to how easy it is to mix, transport, lay and compact. Finding the right balance While reducing the cost of concrete sounds appealing, the right balance needs to be met otherwise the mix will not match your requirements.
Aggregates are important Thinking of aggregates as filler material will sabotage your concrete mix. All deliveries follow the government guidelines.
Call us on Read More. This website uses cookies to enhance your browsing experience More information I understand. Aggregate materials help to make concrete mixes more compact. They also decrease the consumption of cement and water and contribute to the mechanical strength of the concrete, making them an indispensable ingredient in the construction and maintenance of rigid structures. Our CEMEX Aggregate plants have both the technology as well as the operational and technical capacity to develop products that meet the requirements and specifications of our clients.
Many types of construction materials, including concrete, asphalt and mortar, utilize aggregates as key ingredients. Using aggregate materials for concrete reduces production costs and increases the resistance of concrete mixes. These crushed aggregates significantly affect the properties of freshly-mixed and hardened concrete — making it more compact, decreasing its permeability which makes it more water-resistant , and modifying its heat retention values.
These characteristics make aggregate materials an indispensable ingredient when it comes to building and maintaining roads, sidewalks, parking lots, airport runways, railway tracks, and a range of buildings and roadways. In fact, the design phase of most construction projects generally requires a careful analysis of the source of the aggregates, including their type and size, as well as the material properties of the aggregates needed at various stages of the construction process.
In addition to construction projects, aggregates can also be used in drainage, water filtration and erosion control. They can also be used as a fill material in site preparation and embankment projects.
Aggregate may be natural, manufactured or recycled. They provide compressive strength and bulk to concrete. The usual range employed is between 9. A larger size, 40mm, is more common in mass concrete. Gravel is formed of rocks that are unconnected to each other.
Sand occurs naturally and is composed of fine rock material and mineral particles. Its composition is variable depending on the source.
It is defined by size, being finer than gravel and coarser than silt. Glass aggregate. Coarse aggregates are any particles greater than 0. Gravels constitute the majority of coarse aggregate used in concrete with crushed stone making up most of the remainder. Although some variation in aggregate properties is expected, characteristics that are considered include: grading durability particle shape and surface texture abrasion and skid resistance unit weights and voids absorption and surface moisture Grading refers to the determination of the particle-size distribution for aggregate.
Shape and Size Matter Particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.
Consequently, the cement content must also be increased to maintain the water-cement ratio. Generally, flat and elongated particles are avoided or are limited to about 15 percent by weight of the total aggregate.
Unit-weight measures the volume that graded aggregate and the voids between them will occupy in concrete. The void content between particles affects the amount of cement paste required for the mix.
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