# ACI Mix Design Practical Example

Consider the following example: The 28-day compressive

strength should be 7,000 psi. The slump should be

between 3 and 4 in. and the maximum aggregate size

should not exceed ¾ in. The coarse and fine aggregates in

the storage bins are wet.

The properties of the materials are as follows:

Cement : Type I, specific gravity = 3.15

Coarse Aggregate: Bulk specific gravity (SSD) = 2.65; absorption

capacity = 0.5%; dry-rodded unit weight = 100 lb./ft.3

surface moisture = 1%

Fine Aggregate: Bulk specific gravity (SSD) = 2.60; absorption

capacity = 1.1%; fineness modulus = 2.70;

surface moisture = 3.0%

[gview file=”http://www.ce.memphis.edu/1112/notes/project_2/beam/ACI_mix-design_group_problem_2.pdf” profile=”14″]