Practical Works report for calculating the density of grains solide.3éme year Genie Civil.module MDS 1

INTRODUCTION

The density is an important physical characteristic of the soil. To determine the forces exerted by soil, we must determine the density of the solid grains. This density is used as a control parameter. 

PURPOSE 

The purpose of this test is to determine the density of a solid ground to characterize the soil grains to predict its behavior.

EQUIPMENT

Ø Vial Gas, one liter capacity, with rubber stopper and glass lid. 

Ø agitator turning, allowing the agitation of the sample. 

Ø Balance, 5kg capacity, with an accuracy of 0.2kg. 

Ø  Thermometer.

TEST METHOD 

o   Sample Selection 

o   Preparation of the vial gas 

o   Weighing  

o   Adding water and agitation

o   Filling the flask with water and introduction of the cover glass

o   Weighing of the flask with the sample water and the lid 

o   weighing vial and water

CALCULATED

 The density of solid grains, Gs, soil particles for each determination is calculated from equation (1). 
m1 = mass of the vial and cap, m2 = weight of the flask and dry ground cover; m3 = mass of the vial, the cover soil and water mass of the vial filled with water, and lid.

G _s= m₂-m₁/(m₄-m₁)-(m₃-m₂)                   (1)

RESULTS 

 The average of the two values ​​is calculated Gs. In our experimental study tests density solid grains, on a type of sand, and the results are shown in the table below.

test	m1(kg)	m2(kg)	m3(kg)	m4(kg)	Gs
1	0.5875	0.9875	1.305	1.9205	0.39
2	0.5835	0.9835	1.450	1.9090	0.47

The density of solid grains of sand is equal to the average of the two values ​​found for the two tests, such as: G_s = (0.39+0.47)/2 = 0.43

CONCLUSION

Based on the results of the density of solids of our sand grains, we can remember that our sand at a lower density than the reference sand which is equal to 2.65 in almost everyone.