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MP Sub Engg Official Civil Paper Held on 9th July 2017 - Shift 1

Option 4 : All of the above

CT 1: Building materials

2763

10 Questions
10 Marks
10 Mins

**Explanation:**

**Zero air void line**

A curve representing the **relationship between dry unit weight and water content** of the compacted soil **at zero % of air voids** is called a zero air void line.

**Equation of zero air void line,**

\({γ _{d\max }} = \frac{{G{γ _w}}}{{1 + wG}}\)

where,

γ_{dmax} = Maximum dry unit weight of soil

G = Specific gravity

w = water content

γ_{w} = unit weight of water

From the equation, it is clear that the unit weight of soil at zero voids depends on **Specific gravity, water content, and unit weight of water.**

**100 % saturation line**: A curve representing the**relationship between dry unit weight and water content**of the compacted soil**at 100 % the degree of saturation**is called the 100 % saturation line.- Although 100 % saturation line corresponds to zero air void line
**x % saturation line**in general**does not corresponds to****(100 - x) % air void line.**