DETERMINING THE PERCENT OF SOLIDS AND VOIDS IN CONCRETE
AGGREGATE
TXDOT DESIGNATION: TEX-405-A
Test Procedure for
DETERMINING THE PERCENT OF SOLIDS AND
VOIDS IN CONCRETE AGGREGATE
TxDOT Designation: Tex-405-A
Effective Date: August 1999
1.
SCOPE
1.1
This method determines the percentage of solids and voids in coarse and fine concrete
aggregates.
1.1.1
The percent solids and voids are calculated based on absolute volume and are intended
for use in designing Portland cement concrete mixtures.
1.2
The values given in parentheses (if provided) are not standard and may not be exact
mathematical conversions. Use each system of units separately. Combining values from
the two systems may result in nonconformance with the standard.
2.
PROCEDURE
2.1
Obtain a representative sample. Where the coarse aggregate is a combination of different
aggregates (coarse or fine aggregate), obtain a single sample containing both aggregates
in proportion by weight in which they will occur in the mix.
2.2
Determine the SSD specific gravity in accordance with Tex-403-A.
2.3
Determine the unit weight in accordance with Tex-404-A.
3.
CALCULATIONS
3.1
Calculate the percent solids (S) (absolute volume):
S = ( 100 • U ) / ( W • G )
Where:
U = unit weight, kg/m3 (lb./ft.3) of aggregate in SSD condition
G = SSD specific gravity of the aggregate
W = density of water = 1000 kg/m3 (62.5 lb./ft.3).
CONSTRUCTION DIVISION
1–2
LAST REVIEWED: SEPTEMBER 2014
DETERMINING THE PERCENT OF SOLIDS AND VOIDS IN CONCRETE
AGGREGATE
3.2
TXDOT DESIGNATION: TEX-405-A
Calculate the percent voids (V):
V = 100 − S
4.
REPORT
4.1
Report the percent solids and the percent voids to the nearest 0.1%.
CONSTRUCTION DIVISION
2–2
LAST REVIEWED: SEPTEMBER 2014