Question

An aggregate blend is composed of 55% aggregate A (Sp. Gr. 2.631), 25% aggregate B (Sp. Gr. 2.331) and 20% sand (Sp. Gr. 2.609). The Sp. Gr. of the blend aggregate is most nearly:_______

a. 2.732
b. 2.545
c. 2.581
d. 2.614

Answer 1

The right choice would be Option b (2.545).

Step-by-step explanation:

The given values are:

The aggregate blend will be:

`W_A` = 55%

`G_ A` = 2.631

`W_ B` = 25%

`G_B` = 2.331

`W_C` = 20%

`G_C` = 2.609

Now,

On applying the formula, we get

⇒
`G_(BA)=(W_A+W_B+W_C)/((W_A)/(G_A) +(W_B)/(G_B) +(W_C)/(G_C))`

On substituting the values, we get

⇒
`=(55+25+20)/((55)/(2.631) +(25)/(2.331) +(20)/(2.609))`

⇒
`= (100)/((55)/(2.631) +(25)/(2.331) +(20)/(2.609))`

⇒
`=2.545`