Question

Typically, increase the fineness of portland cement will _________ the rate of hydration process.
A. increase             B. decrease             C. not affect

In what case the concrete can benefit from the high heat generated during hydration process? And what case the high heat will have negative effect on the concrete?

Define the following terminologies and identify their differences: density, relative density, bulk density, specific gravity and unit weight.

Answer 1

3. Define the following terminologies and identify their differences: density, relative density, bulk density, specific gravity and unit weight.

1. Density:
   Density of a material is defined as the ratio of mass of material to the Unit volume of the material.

                                                  

2. Bulk density:

Bulk density is defined as the ratio of mass of particles to the volume occupied by those particles.

3. Relative density or Specific gravity:

Relative density or specific gravity is defined as the ratio of density of material to the density of reference material.

Specific gravity is usually ratio of density of material to the density of water.

4. Unit weight:

The specific weight or unit weight is defined as the weight of the material per unit volume of a material.

Sometimes, the terms specific gravity, and less often specific weight, are also used for relative density.