During a foundation inspection, you discover that the excavated soil has a high clay content and poor drainage. What is the most appropriate action before proceeding with concrete placement?
Correct Answer
B) Install proper drainage and compact granular backfill material
High clay content with poor drainage can cause foundation settlement and water issues. Installing proper drainage and using granular backfill material addresses the soil conditions before concrete placement.
Why This Is the Correct Answer
Option B is correct because high clay content soil with poor drainage creates unstable foundation conditions that can lead to differential settlement, heaving, and water infiltration problems. Installing proper drainage systems removes excess water from around the foundation, while granular backfill material provides better load distribution and drainage characteristics than clay. This preparation work must be completed before concrete placement to ensure long-term foundation stability and prevent costly structural issues.
Why the Other Options Are Wrong
Option A: Place concrete immediately to prevent further water infiltration
Placing concrete immediately would trap water and create worse conditions, as the clay soil cannot properly support the foundation and will continue to have drainage issues that could cause settlement or heaving after the concrete cures.
Option C: Add more cement to the concrete mix to increase strength
Adding more cement to increase concrete strength does not address the underlying soil problem - even stronger concrete will fail if placed on unstable, poorly-draining clay soil that can shift or settle.
Option D: Reduce the footing width to minimize soil contact
Reducing footing width would actually increase the load per square foot on the already problematic clay soil, making settlement more likely rather than solving the drainage and soil stability issues.
Memory Technique
Think 'DRAIN before you GAIN' - always address drainage and soil issues before placing concrete to gain a stable foundation.
Reference Hint
Florida Building Code Chapter 18 (Soils and Foundations) and ACI 318 Chapter 13 for foundation requirements on problematic soils
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