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### Concrete Splitting Tensile Strength Test Equations and Calculator

Civil Engineering and Design

Strength of Materials Basics and Equations | Mechanics of Materials

Concrete Splitting Tensile Strength Test Equations and Calculator

The extent and size of cracking in concrete structures are affected to a great extent by the tensile strength of the concrete. The ASTM C496 split cylinder testing procedure is the standard test to determine the tensile strength of concrete. A 6 in"12 in (150 mm"300 mm) cast or drill-core cylinder is placed on its side as in Fig. 1, and the minimum load, P, that causes the cylinder to split in half is used to calculate the splitting tensile strength.

Figure 1, Concrete Splitting Tensile Strength Test

ACI 318 Sec. 5.1.4 suggests that the splitting tensile strength fct can be calculated from correlations with compressive strength, and ACI 318 Sec. 8.6.1 indirectly gives such correlations. The general relationship between splitting tensile strength and compressive strength is

Eq. 1, SI Units

*f _{c} = 0.56 · λ · f '_{c}^{0.5}*

*Eq. 2, U.S.
f _{c} = 6.7 · λ · f '_{c}^{0.5}*

Where:

* f ' _{c}* = compressive strength of concrete, lbf/in

^{2}(MPa)

*λ*= Lightweight Aggregate Factors, see table 1

*f*splitting tensile strength, lbf/in

_{c}=^{2}(MPa)

Lightweight concrete has a lower tensile strength than
normalweight concrete, even if both have the same compressive
strength. The lightweight aggregate factor, *λ*, is
used to account for this lower tensile strength and is
determined from Table 1. For concrete using a blend
of lightweight and normalweight aggregates, ACI 318
Sec. 8.6.1 allows for linear interpolation to determine
the lightweight aggregate factor. ACI 318 also permits
the use of laboratory tests to correlate splitting tensile
strength with compressive strength.

Table 1 Lightweight Aggregate Factors, *λ*

- normal weight concrete = 1.0
- sand-lightweight concrete = 0.85
- all-lightweight concrete = 0.75

Reference

Civil Engineering Reference Manual, Fifteenth Edition, Michael R. Lindeburg, PE

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