Epoxy-resin grout shall be a two-component material, 100 percent solids by
weight, formulated to meet the requirements of ASTM C 881/C 881M, Type I or
II. Type I material shall be used when materials or atmospheric
temperatures are 20 degrees C 70 degrees F or above. Type II material
shall be used when materials or atmospheric temperatures are below 20
degrees C 70 degrees F. Epoxy-resin grout shall have the ability to
structurally rebond cracks, delaminations, and hollow plane conditions in
concrete; shall be insensitive to the presence of water; and shall have the
capability to penetrate cracks down to 0.12 mm 5 mils in width. Materials
shall have been used in similar conditions for a period of at least five
years.
2.1.16
Epoxy Injection Ports
Injection ports for epoxy-resin grout shall be designed for the intended
use as detailed in this section and shall be made according to the
recommendation of the epoxy manufacturer.
PART 3
EXECUTION
3.1
EVALUATION AND ANALYSIS
Evaluation and analysis shall conform to the requirements specified herein,
and the requirements specified in Section 01451A CONTRACTOR QUALITY CONTROL.
3.1.1
Existing Concrete
Concrete renovation shall be undertaken only after a complete evaluation
and analysis of the areas to be repaired is completed. This shall include
sampling and testing of the existing concrete to determine its composition
and qualities. A condition survey of the area to be repaired shall conform
to ACI 201.1R and ACI 364.1R. Strength evaluation shall be per ACI 437R.
Cracks shall be evaluated per ACI 224.1R. Examination and sampling
procedures shall conform to ASTM C 823.
3.1.2
Evaluation and Acceptance of New Concrete
3.1.2.1
Frequency of Testing
Samples for strength, slump, air content, and shrinkage tests of each
concrete mixture placed each day shall be taken not less than once a day,
and at least once for each 0.33 cubic meters 10 cubic feet of concrete; nor
less than once for each 50 square meters 500 square feet of surface area
for slabs or walls. Samples for strength, slump, air content, and
shrinkage tests of each mortar mixture placed each day shall be taken not
less than once a day, and at least for each 0.25 cubic meters 9 cubic feet
of mortar. If this sampling frequency results in less than 3 strength
tests for a given class of concrete or individual mixture design, tests
shall be made from at least 3 randomly selected trucks (or batches) or from
each truck (or batch) if fewer than 3 truck loads (or batches) are used.
Field cured specimens for determining form-removal time or when a structure
may be put in service shall be made in numbers directed to check the
adequacy of curing and protection of concrete in the structure. The
specimens shall be removed from the molds at the age of 24 hours and shall
be cured and protected, insofar as practicable, in the same manner as that
given to the portion of the structure the samples represent.
SECTION 03900
Page 19
Previous Page
