110 Utility Sand

This technical note and the following data were developed from tests conducted by Graniterock’s Research Technical Services Group.

A major Bay Area utility company has written specifications concerning trench fill sand for its applications. The specifications establish acceptable limits concerning gradations, organic impurities, sand equivalents, pH, chloride content, sulfate content, and compaction.

110 Utility Sand can be used in a variety of applications including trenches for pipelines, fiber optic and electrical cables, fill behind retaining walls and under concrete slabs. Below you will find a typical utility’s specification as well as Graniterock’s 110 Utility Trench Fill Sand results.

Sand color is a significant issue. The trench fill material must be lighter than normal soil color so that a sudden color change will alert contractors they are working in a utility trench. The goal is to avoid damage to buried utilities.

The correct pH and low level chloride and sulfate concentrations are extremely important to maintain the integrity of critical transmission components. The utility’s goal is to minimize corrosive attack on their equipment to extend service life. Extended service life will reduce operating costs, reduce service interruptions and reduce the possibility of potential leaks.

110 Utility Sand is produced by crushing granite into the proper particle size distribution. To ensure optimum workability and compaction we suggest the contractor add water via water truck during installation.

For additional information, please contact the Aggregate Division Sales Office at 831.768.2380.

SIEVE ANALYSIS

Sieve Typical Utility Specification A.R. Wilson Quarry 110 Utility Sand
½″ 100 100
#4 75-100 100
#8 70-100 86
#16 65-100 62
#30 50-100 47
#50 40-70 35
#100 0-30 26
#200 0-15 17.8

ADDITIONAL CRITERIA

Additional Criteria Typical Utility Specification A.R. Wilson Quarry 110 Utility Sand
Organic Impurities No Darker Than Plate 3 Lighter Than Plate 3
Sand Equivalent ≥ 20 70
pH ≥ 4.5, but <9 7.8
Chloride Content ≤ 500 ppm 2.2
Sulfate Content ≤ 150 ppm 9.6
Compaction 95% 95%