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It covers how moisture condition (dry vs. saturated) and drilling direction (horizontal vs. vertical) affect results. A novice might not know that a dry core is typically 10-15% stronger than a wet one; this guide forces you to standardize the condition. The Caveats (The Bad & Dated) 1. It is a "R-10" (Reaffirmed, not Revised) As of 2025, this is still the 2010 edition. While ACI reaffirmed it (meaning the technical content is still sound), some references to equipment or data logging feel dated. You will not find modern discussion of digital image correlation or non-destructive testing (NDT) integration here.
Rating: ⭐⭐⭐⭐½ (4.5/5)
The chapter on length-to-diameter ratio is critical. It explains precisely how to correct core strength if your core is too squat (e.g., a 4-inch core that is only 3 inches long). Without these corrections, you will overestimate or underestimate strength by 10-20%.
This is not a "5-minute quick guide." If you are a field superintendent looking for a flowchart, you will get lost in the statistical annexes. You need a basic understanding of normal distribution and coefficient of variation to use Appendix A effectively.
High. At roughly $50–$80 (ACI member pricing), it pays for itself the first time it saves you from wrongly rejecting a slab.
ACI 318 (Building Code) and ASTM C42 (Standard Test Method for Obtaining Cores). Pro Tip for PDF users: Make sure you get the official ACI PDF (watermarked). Some third-party scan copies of this particular 2010 edition have illegible figures in Appendix B. The searchable text feature in the official PDF is worth the extra cost.
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