Concrete Test Cylinder Calculator

Design checks

Calculation

1. 1Sets required by pour daysACI318 5.6.2
   n_{time} = \text{one set per day of placing}
   n_{time} = 3 \text{ days} \Rightarrow 3
   n_{time}=3
2. 2Sets required by volume placedACI318 5.6.2
   n_{vol} = \left\lceil \frac{V}{V_{set}} \right\rceil
   n_{vol} = \left\lceil \frac{400.0}{150} \right\rceil = 3
   n_{vol}=3
3. 3Sets required by surface areaACI318 5.6.2
   n_{area} = \left\lceil \frac{A}{A_{set}} \right\rceil
   n_{area} = \left\lceil \frac{12000}{5000} \right\rceil = 3
   n_{area}=3

   A thin element can cover a large area on very little concrete, which the volume criterion alone would under-test.

4. 4Governing number of test setsACI318 5.6.2
   n = \max\left(n_{time},\; n_{vol},\; n_{area}\right) \ge n_{min}
   n = \max(3,\,3,\,3) = 3,\quad n_{min} = 5 \Rightarrow 5
   n=5

   The calculated criteria give 3; the ACI 318-08 minimum of 5 governs.

5. 5Cylinders to cast
   N = n \times c
   N = 5 \times 3 = 15
   N=15
6. 6Lower bound on an individual strength testACI318 5.6.3.3(b)
   f_{min} = f'_c - 500\ \text{psi}
   f_{min} = 3500
   f_{min}=3500 psi

Assumptions

• One concrete class and one mix design. A pour with more than one class is tested for each class separately.
• A cylinder entered as zero is treated as not cast, and is left out of that test's average.
• Cylinder strengths are the values reported by the testing laboratory, already corrected for any specimen size or capping requirement.