What are concrete aggregates?
Concrete aggregate is an important part of concrete and directly affects the strength, durability and economy of concrete. In recent years, with the rapid development of the construction industry, the selection and application of concrete aggregates have become a hot topic. This article will combine the hot content on the Internet in the past 10 days to introduce the types, characteristics and applications of concrete aggregates in detail, and present relevant content in structured data.
1. Types of concrete aggregates
Concrete aggregates are mainly divided into two categories: coarse aggregate and fine aggregate, and their sources include natural aggregates and artificial aggregates. The following are the specific categories and characteristics:
| Aggregate type | Source | Particle size range | Common materials |
|---|---|---|---|
| coarse aggregate | natural or artificial | Greater than 4.75mm | gravel, pebbles |
| fine aggregate | natural or artificial | Less than 4.75mm | River sand, machine-made sand |
2. Characteristics of concrete aggregate
The characteristics of aggregates directly affect the performance of concrete. The following are the key properties of aggregates and their impact on concrete:
| Features | influence | ideal indicator |
|---|---|---|
| intensity | Determine the compressive resistance of concrete | High compressive strength |
| particle size distribution | Affects concrete density | continuous grading |
| Mud content | Reduce concrete strength | less than 3% |
| water absorption | Affect the workability of concrete | less than 2% |
3. Application of concrete aggregate
Different projects have different requirements for concrete aggregate. The following are application cases of aggregates in popular projects in the past 10 days:
| Project type | Recommended aggregate | Reason |
|---|---|---|
| high-rise building | high strength gravel | Improve the compressive performance of concrete |
| road construction | Wear-resistant pebbles | Enhance pavement durability |
| water conservancy project | Low water absorption machine-made sand | Reduce moisture penetration |
4. Market trends of concrete aggregates
Recently, environmental protection and sustainable development have become hot topics in the construction industry, and the market demand for concrete aggregates is also changing:
1.Environmentally friendly aggregate: The usage rate of recycled aggregates (such as construction waste recycled aggregates) has increased significantly because it can reduce resource waste and environmental pollution.
2.High performance aggregate: With the advancement of construction technology, the requirements for the strength and durability of aggregates are getting higher and higher, and high-performance aggregates have become the new favorite in the market.
3.Manufactured sand instead of river sand: Due to the shortage of river sand resources, the application proportion of manufactured sand is increasing year by year, especially in coastal areas.
5. Summary
The selection of concrete aggregate is crucial to project quality and cost control. By analyzing recent hot topics, it can be seen that high-performance, environmentally friendly aggregates are becoming the mainstream of the industry. In the future, with the advancement of technology and the improvement of environmental protection requirements, the application of concrete aggregates will become more diversified and refined.
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