H

Hardened concrete
Concrete whose preparation time has surpassed the setting time. As consequence, it is in a rigid state.

Headframe
Vertical of reinforced concrete used to join two or more walls and support the slab structure.

Heat of Hydration
Heat evolved upon reactions produced by hardening (complete hydration) of Portland cement and water.

High strength concrete
Concrete with compression resistance to 28 days up to 420 kg/cm2. Its use reduces dimension of structural elements, increasing the service area by levels.

Honeycomb concrete
Appearance of honeycombs of concrete aggregates, as a result of a deficient consolidation.

Hydration
Slow process during which cement reacts with water to generate chemical constitutens for concrete strength.

Hydraulic binder or cementing material
It is the cementing material that after adding water, or mixed with sand or other similar materials, has the property to set air or to set under water and to form a hardened mass.

Hydraulic cement
Any type of cement, capable of setting and hardening due to chemical reaction between water and cement.