An Overview of High-Strength Concrete and Pumping Technology

This report discusses the use of high-strength concrete (HSC) in modern construction, particularly in tall structures, where it is essential for load-bearing capabilities. It highlights the importance of high-quality aggregates and low water-to-binder ratios in achieving the required strength and reduced porosity. The report also addresses the challenges and considerations involved in pumping concrete, such as potential blockages due to aggregate fitting, hot weather, and unsuitable mix designs, emphasizing the need for careful mix design, thorough testing, and systematic monitoring of rheology and pipe pressures. Furthermore, it touches on the impact of aggregate abrasiveness and size on pumping efficiency and pipeline lifespan, referencing a case study involving the use of dolomitic limestone for a concrete oil platform in Dubai. The document concludes by underscoring the critical role of pumping in making concrete a viable construction material, especially in large-scale projects.

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The considerable tallness to which present-day elevated structures are developed instinctively
brings about high loads which must be conveyed by vertical load-bearing auxiliary individuals,
for example, segments, center dividers and heaps. Keeping in mind the end goal to convey these
heaps, without having segments and heaps of unnecessarily vast cross-areas, high-quality
concrete (HSC) must be utilized alongside vigorously fortified steel confines. This is apparent
from the high qualities required for HSC concrete, the expanded pressing thickness
accomplished due to a lower w/b proportion and the utilization of super plasterers combined with
high fineness extenders (FA and CSF) brings about the lessened porosity of the bond glue and
interfacial progress zone (ITZ). This microstructure refinement gives the higher compressive
quality yet, renders the total as the powerless connection as far as compressive quality with the
disappointment plane in pressure for the most part through the totals. Since the total turns into
the basic part, high caliber and high-quality totals ought to be utilized (Neville, 2015).
Also, to accomplish an adequately low w/b proportion a total with a low water necessity ought to
be utilized. The appropriateness of the total for pumping ought to likewise be considered while
picking a total to guarantee conservative pumping. The utilization of pulverized nearby dolomitic
limestone for the high concrete oil platform gave adequate quality, had a low water necessity and
turned out to be conservative for pumping. Hence leading to the use of the high-performance
concretes strength of 80MPa in 70,000m3 (Orchard, 2016).
PUMPING
Without the capacity of cement to be pumped, it would not be a suitable development material as
substantial amounts of material should be lifted by cranes bringing about profoundly wasteful
development due to impeded throwing rates. Pumping concrete, particularly in super tall what's

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more, mega tall, can bring about directing blockages because of total fitting, sweltering climate,
throwing delays and hazardous cement blends which can cause postponements and end up being
expensive. Thus, cautious blend outline, adequate trial blends and full-scale directing tests earlier
to the development and orderly on location observing of rheology and pipe weights are
significant to limit the potential for blockages (Sheety, 2013).
Blockages because of the early setting of the solid in the pipeline can likewise be an issue
because of the time span (can associate with 30 min [3]) required to draw the solid to high
elevations. On account of the precast manufacturing yard on-shore, this was exacerbated by the
sweltering summer climate experienced in the Dubai where temperatures can once in a while
reach 50°C thus a particularly outlined super plastering and mixture which given satisfactory
impediment was important to guarantee adequate time for pumping of the solid before setting
initiated. The measurements of the admixture must fluctuate for the extraordinary periods of the
year as Dubai encounters generally cool winters. The decision of course total for the solid blend
can have a noteworthy effect on the cost of pumping. Two essential properties of course totals
that must be thought about when choosing a course total are the abrasiveness and most extreme
size. A rough total can cause unreasonable wear on the coating of the pipeline, particularly at
high pumping weights required for super tall and mega tall structures, to such an extent that the
life expectancy of the pipeline can be diminished to around 10 000 m3. For the precast
manufacturing yard on-shore, a pipeline life expectancy of roughly 40 000m3 was accomplished
by utilizing a less rough dolomitic limestone. The most extreme total size influences the extent of
the pipeline. For the most part, the pipe distance across ought to be no less than four times the
most extreme total size to decrease the potential for blockages. Notwithstanding, a bigger pipe
distance across requires a more noteworthy weight head. A 150 mm breadth pipeline was utilized
for the precast manufacturing yard on-shore for the 20 mm total up to around a stature of 350 m.
At heights higher than this the total measure was decreased, and in addition, the pipe breadth, to
lessen pumping weight (Mehta, 2011).

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REFERENCES
Mehta, P.K., 2011. Concrete. Structure, properties and materials.
Sheety, M.S., 2013. Concrete technology. published by S. Chand & Company Ltd., New Delhi-
2011.
Orchard, D.F., Curran, A. and Hearne, R., 2016. CONCRETE TECHNOLOGY-VOLUME 1-
PROPERTIES OF MATERIALS (No. Monograph).
Neville, A.M. and Brooks, J.J., 2015. Concrete technology.