Which test measures the effect of aggregates on concrete's electrical resistance?

The resistivity test is specifically designed to measure the electrical resistance of concrete, which is influenced by the types and properties of aggregates used within the mix. This test assesses how easily electric current can flow through the concrete, providing valuable insight into its durability and potential performance in terms of corrosion resistance.

Higher resistivity generally indicates a lower permeability of concrete, which can lead to better protection of the reinforcing steel embedded within it. The properties of aggregates, such as their size, shape, and composition, play a crucial role in determining the electrical resistivity of concrete. Therefore, the resistivity test is essential for understanding how the choice of aggregates can impact the overall performance and longevity of the concrete.

In contrast, the tensile strength test, compressive strength test, and modulus of elasticity test evaluate mechanical properties of concrete rather than its electrical properties, making them unsuitable for examining the effects of aggregates on electrical resistance.