In the construction of a levee by compacting soil excavated from a borrow area to dry density of 1.78 g/cc, to make the compaction process more workable, an optimum water content of 15% is necessary. However the natural moisture content and bulk density of the soil were 9% and 1.83 g/cc respectively. Find out the quantity of water to be added for every 100 m3 of finished embankment.

In the construction of a levee by compacting soil excavated from a borrow area to dry density of 1.78 g/cc, to make the compaction process more workable, an optimum water content of 15% is necessary. However the natural moisture content and bulk density of the soil were 9% and 1.83 g/cc respectively. Find out the quantity of water to be added for every 100 m3 of finished embankment.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Embankment is to be built with 15 km length of proposed road with 2 m height of road embankment. The cross sectional area of embankment and distance of borrow pit from embankment are 30 m² and 10 km respectively. Soil is to be compacted to 97 % of the max dry density. Information given as follows: (a) Results from laboratory compaction test: Max dry density-1.80 Mg/m³ Optimum water content=12% (b) Borrow material: Dry density-1.70 Mg/m² Water content-8% Calculate volume of additional water required for the entire volume of the embankment Final answer should be = 27, 486 m³
Data for field density by sand cone method: Weight of bottle + cone + sand before going to the field = 8990.5 g Weight of soil excavated from hole = 7550 g Weight of bottle + cone + sand after use = 2931 g Weight of sand required to fill the cone, Wc = 1578 g Dry unit weight of sand = 1.533 g/cm3 Moisture content = 6% 1- Calculate dry unit weight of compaction in the field.
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