1.6.4
Repair Material Mixture Proportioning
Submit, at least 15 days before work commences, a repair material mixture
proportioning for each use of [polymer-modified mortar] [polymer-modified
concrete] [dry-pack mortar]. Test reports shall accompany the mixture
proportions. Identify the proposed source of the materials and state the
proportions of each constituent. When determining the mixture design, use
samples of materials to be used on the job.
a. Trial batches: Trial batches and testing requirements for various
repair materials specified shall be the responsibility of the
Contractor. The laboratory performing the tests shall be on site and
shall conform to ASTM C 1077. Samples of aggregates shall be obtained
in accordance with the requirements of ASTM D 75. Samples of materials
other than aggregate shall be representative of those proposed for the
project and shall be accompanied by the manufacturer's test reports
indicating compliance with applicable specified requirements. Trial
mixtures having proportions, consistencies, and air content suitable
for the work shall be made based on methodology described in ACI 211.1,
which will produce a range of strength encompassing those required for
the work. The maximum water-cementitious materials ratios required in
Section [03300A CAST-IN-PLACE STRUCTURAL CONCRETE][03301A CAST-IN-PLACE
STRUCTURAL CONCRETE FOR CIVIL WORKS][03307 CONCRETE FOR MINOR
STRUCTURES], paragraph MAXIMUM WATER-CEMENTITIOUS MATERIALS RATIO will
be converted to a weight ratio of water to cementitious materials.
b. Supporting criteria:
Include in the submittal the following data
for each trial batch:
(1)
Proportions by weight
(2)
Unit weights and specific gravities of constituents
(3)
Batch weights
(4)
Compressive strengths in accordance with the following:
Material
Specimen Size
Test
Concrete
150 by 300 mm (6 by 12 inch) 6 by 12 inch cylinders
ASTM C 39/C 39M
Mortar
75 by 150 mm (2 by 6 inch) 3 by 6 inch cylinders
ASTM C 39/C 39M
Grout
50 mm (2 inch)2 inch cube
ASTM C
109/C 109M
(5)
Curing time
(6)
Working time (polymer-modified materials)
(7)
Slump
(8)
Air content
SECTION 03931
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