Moisture content calculation

Question 1

How to calculate the moisture content relative to certain conditions?

Answer 1

MC(cond) = [W(stock) - W(cond)]/W(cond) * 100%

Question 2

How to calculate the absorption capacity and effective absorption capacity?

Answer 2

AC = [W(SSD) - W(OD)]/W[OD] * 100%
AC(eff) = [W(SSD) - W(AD)]/W[AD] * 100%

Question 3

Why is moisture content under SSD condition used as reference?

Answer 3

Because it is an equilibrium at which the aggregates will neither absorb water nor give up water to the paste.

Question 4

What is density? What is bulk density?

Answer 4

Density is weight per unit volume
D = W/V(solid)

Bulk density: Volume includes the pores inside a single aggregate
BD = W/[V(solid) + V(pores)]

Question 5

What is specific gravity?

Answer 5

Mass of a given substance divided by unit mass of an equal volume of water
(density ratio of a substance to water)

Question 6

What is absolute specific gravity and bulk specific gravity?

Answer 6

ASG = D/ρ
BSG = BD/ρ