Everything You Need to Know About High-rise Concrete Pumping
Concrete pumping has become a crucial practice in the modern construction industry, with significant technological advancement over the years. Among the many innovative ideas emerging, High Rise Concrete Pumping stands out as a notable one.
With concrete used for many high-rise residential or commercial projects, the conventional method of lifting it in buckets via cranes has become cumbersome. Although it gets the work done, this process is tedious, time-consuming, and dangerous. However, with the help of high-rise concrete pumping, it is possible to access and pour concrete in nooks and corners that were not reachable earlier. A brilliant innovation in the construction industry, it revolutionized how people perceive concrete.
Working of High-Rise Concrete Pumps
Usually, 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 the builder needs. These arms have a variable length that can be extended or retracted with a button, specifically to meet site requirements.
Uses of High-Rise Concrete Pumps
Below are some use cases where high-rise concrete pumps can be utilised:
- Restricted areas with limited access
- Construction sites with closed quarters
- Commercial construction or civil construction
- Construction sites where minimum labour is available
- Areas that need faster concrete pouring speed
High-rise concrete pumping ensures efficiency and prevents human errors at construction sites while helping save 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 Pumps
The ability of concrete to be pumped makes it a viable construction material, as a large quantity of material is required to be lifted by cranes. However, specifically in supertall and mega-tall structures, pumping concrete can lead to blockages owing to aggregate plug, hot weather, casting delays, and problematic concrete mixes that can result in delays and hence, can become expensive.
We can minimize potential blockages with the help of careful mix design, trial mixes, full-scale pumping tests before construction, proper on-site monitoring of rheology and pipe pressures. To enhance the pumpability of concrete, fine aggregates must be used as it improves cohesiveness.
However, extremely fine aggregates cannot be used as they can make the mix excessively cohesive. It will require increased pumping pressures due to increased friction between the concrete and the inner lining of the pipeline. Using Condensed Silica Fume (CSF) at 8- 10% replacement and fine aggregate percentage of 50% for the concrete mix helps prevent aggregate plug and the mixture from becoming overly cohesive.