of a direct flame to the walls of storage tanks or transfer lines. Storage
tanks, transfer lines and weigh buckets shall be thoroughly cleaned before
a different type or grade of bitumen is introduced into the system.
1.5.3
Slurry Grout Sand
Slurry grout sand shall be stored at the grout production site to prevent
contamination with foreign materials and saturation with rain water.
Moisture content of this sand shall be determined just prior to grout
production so that corrections to the job mix formula water content can be
made to compensate for any moisture in the sand.
1.5.4
Cementitious Materials
The temperature of the cementitious materials, as delivered to storage at
the site, shall not exceed 65 degrees C 150 degrees F.
1.6
ACCESS TO PLANT AND EQUIPMENT
The Contracting Officer shall have access at all times to all parts of the
bituminous plant for checking adequacy of any equipment in use; inspecting
operation of the plant; verifying weights, proportions, and character of
materials; and checking temperatures maintained in preparation of the
mixtures.
PART 2
PRODUCTS
2.1
AGGREGATE
Aggregate shall consist of crushed stone, or crushed gravel without sand or
other inert finely divided mineral aggregate. The portion of materials
retained on the 4.75 mm No. 4 sieve shall be known as coarse aggregate, the
portion passing the 4.75 mm No. 4 sieve and retained on the O.075 mm No. 200
sieve as fine aggregate. Sieve analysis of coarse and fine aggregates
shall be conducted in accordance with ASTM C 136.
2.1.1
Coarse Aggregate
Coarse aggregate shall consist of sound, tough, durable particles, free
from adherent films of matter that would prevent thorough coating with the
bituminous material. The percentage of wear shall not be greater than 40
percent when tested in accordance with ASTM C 131. The magnesium sulfate
soundness loss shall not exceed 18 percent, after five cycles, when tested
in accordance with ASTM C 88. Aggregate shall contain at least 75 percent
by weight of crushed pieces having two or more fractured faces. The area
of each fractured face shall be equal to at least 75 percent of the
smallest mid-sectional area of the piece. When two fractured faces are
contiguous, the angle between the planes of fractures shall be at least 30
degrees to count as two fractured faces. Fractured faces shall be obtained
by artificial crushing.
2.1.2
Crushed Aggregates
Particle shape of crushed aggregates shall be essentially cubical.
Quantity of flat (width to thickness ratio greater than 3) and elongated
particles (width to length ratio greater than 3) in any sieve size shall
not exceed 8 percent by weight, when determined in accordance with ASTM D
4791.
SECTION 02746
Page 10
Previous Page
