Everything You Need to Know About High-rise Concrete Pumping
Over the years, there has been significant growth in concrete pumping solutions, which is one of the most important practices in the contemporary construction industry. Of innumerable innovative ideas being developed, High Rise Concrete Pumping is a notable one.
High rise concrete has become much more prevalent in modern construction, with more and more high-rises being built. Earlier, the construction of high-rise buildings required concrete to be lifted in buckets by cranes. Although successful, this process was tedious, time-consuming, and dangerous. However, on the other hand, high-rise concrete pumping lets concrete pour in locations where the traditional concrete method will not be able to reach. This technology has not only saved sizable amounts of money but also revolutionized the way people perceive concrete.
Working of High-rise Concrete Pumping
In most cases, a boom concrete pump with a robotic arm is attached to the truck. The arm controls the transfer of the concrete and is loaded with giant power to assist the operator to reach the height that builder needs. These arms have varied lengths that can be extended and retracted with a button, specifically made to meet site requirements.
Uses of High-rise Concrete Pumping
The use of high-rise concrete pumping is not only restricted to high-rise buildings. Below are some of the use cases:
- Restricted areas with limited access
- Construction sites with closed quarters
- Commercial construction or civil construction
- Sites where minimum labors are available
- Areas where concrete pouring speed is to be increased
High-rise concrete pumping ensures efficiency and prevents human errors at construction sites while helping save abundance of time and effort. The highest pumping achieved so far was achieved in 2008 to help build Burj Dubai Tower in Dubai itself with a Putzmeister 14000 SHP D super high pressure.
Pumpability of High-rise Concrete Pumping
The ability of concrete to be pumped makes it a viable construction material as huge quantities of materials require to be lifted by cranes. However, specifically in supertall and mega tall, pumping concrete can lead to blockages owing to aggregate plug, hot weather, casting delays, and problematic concrete mixes that can result in delays and expensive affairs.
Hence, to prevent this, careful mix design, sufficient trial mixes, and full-scale pumping tests before construction and proper on-site monitoring of rheology and pipe pressures are significant to minimize the potential blockages. To enhance the pumpability of concrete, the aggregate needs to be highly fine. It improves cohesiveness.
Fine aggregate content that is too high, causing the mix to be excessively cohesive, will require increased pumping pressures due to increased friction between the concrete and the inner lining of the pipeline. The use of CSF at 8- 10% replacement and fine aggregate percentage of 50% for the concrete mix helps to prevent aggregate plug and at the same time did cause the mix to be overly cohesive.
Blockages due to the early setting of the concrete in the pipeline can also be a problem due to the length of time (can be around 30 min required) to pump the concrete to high altitudes. A specifically designed superplastic Ing admixture that provided adequate retardation is necessary to ensure sufficient time for pumping of the concrete before setting commenced.