7.12 : コンクリートの衝撃強度

Consider driving a concrete pile into the ground with impacts or concrete foundations for machinery that endure sudden loads or unintentional impacts on precast concrete elements while handling.

Concrete should have enough strength to withstand these impacts. Evaluating concrete's impact strength involves determining its resistance to repeated impacts and ability to absorb energy.

Specifically, the count of impacts the concrete tolerates before it exhibits no rebound indicates significant damage.

Impact strength increases in mixes using coarse aggregates with more angular shapes and rougher surfaces, indicating its relation to bending strength.

Concrete's impact and compressive strength are related and vary with the aggregate type and their storage conditions; for example, concrete stored in water has a lower impact strength than concrete stored in dry conditions.

Reducing the maximum aggregate size and aggregates with a lower Poisson's ratio and lower modulus of elasticity can enhance the impact strength of concrete.

For adequate impact strength, using a cement content of less than 670 pounds per cubic yard in the concrete mix is beneficial.