Concrete pumping logistics: under typical site conditions, concrete transported by pump is commonly limited to what approximate horizontal distance?

Introduction / Context:
Pumping concrete enables placement in high-rise and congested sites. However, pump line length, bends, elevation, and mix rheology limit practical reach. Knowing typical limits helps plan pump placement and pipeline routing.

Given Data / Assumptions:

• Ordinary piston/boom pumps with steel pipelines and standard elbows.
• Good pumpable mix with suitable fines and slump.
• Question asks for a commonly quoted horizontal reach, not an extreme or specialized record.

Concept / Approach:
Rules of thumb: about 300 m horizontal or about 30–40 m vertical are common practical limits for many jobs without extraordinary measures. Longer distances are possible but require special planning (larger pumps, fewer bends, lubrication, high fines content).

Step-by-Step Solution:
Identify typical horizontal range: ≈ 300 m for standard setups.Select 300 m accordingly.

Verification / Alternative check:
Manufacturers and guides often cite 300 m horizontal as a reference limit for standard concrete and lines.

Why Other Options Are Wrong:

• 100/200 m: too conservative for standard boom/line pumps.
• 400 m: achievable in special cases, but not the typical planning value.
• None: incorrect because a common planning figure exists.

Common Pitfalls:
Ignoring equivalent length added by bends/valves; using non-pumpable mixes (gap-graded, harsh) that reduce feasible distance.

Final Answer:
300 m