1731 – GROUT USED IN POST-TENSIONING 1700-48
1731.1 Description
This specification covers grouts to be used to protect post-tensioning steel in haunched slab bridges.
1731.2 Materials
a. Provide material that does not contain aluminum or other components which produce hydrogen, carbon dioxide or oxygen gas. b. Provide material complying with the requirements listed in TABLE 1731-1. Conduct all tests with material mixed to produce the minimum time of efflux. Establish the water content to produce the minimum and maximum time of efflux. TABLE 1731-1: GROUT USED IN POST-TENSIONING Property Test Method Requirement Total Chloride Ions, max. ASTM C 1152 0.08% by weight Hardened Height Change ASTM C 1090 a 0.0% to +0.2% Expansion ASTM C 940 Max. 2.0% for up to 3 hours Wet Density ASTM C 188 Max. and min. obtained test value, lb/ft 3 Compressive Strength ASTM C 942 Min. 7,000 psi Initial Set Time, min. ASTM C 953 3 hours Initial Set Time, max. ASTM C 953 12 hours Time of efflux, immediately after mixing b ASTM C 939 Min. 20 seconds Max. 30 seconds ASTM C 939c Min. 9 seconds Max. 20 seconds Time of efflux, 30 minutes after mixing with remixing for 30 seconds b ASTM C 939 Max. 30 seconds ASTM C 939c Max. 30 seconds Permeability @ 28 days ASTM C 1202 Max. 2,500 coulombs a Modify ASTM C 1090 to include verification at both 24 hours and 28 days. b Must meet one of the two sets of requirements shown. c Modify the ASTM C 939 test by filling the cone to the top instead of to the standard level.
1731.3 Test Methods
Test in accordance with the requirements stated in subsection 1731.2.
1731.4 Prequalification
a. Each grout intended for use under this specification must be prequalified before use. Submit a written request to be evaluated for prequalific ation to the Chief of Materials and Research. Provide the following for the material to be evaluated:
1.Name, address and telephone number of the manufact urer. Include the name of the preferred contact person.
2.Brand name of the grout.
3.A complete description, literature, and set of instructions.
4.Material Safety Data Sheets.
5.A copy of test results performed as outlined in subsection 1731.2b from a recognized laboratory. Include evidence that the laboratory is regularly inspected regularly. A recognized labo ratory is one operated by any State Transportation Agency, the Federal Highway Administration, or other cement and concrete laboratory regularly 1731 – GROUT USED IN POST-TENSIONING 1700-49 inspected by the Cement & Concrete Reference Laborato ry (CCRL) of the National Institute of Standards and Technology. Test results are to be no more than 24 months out of date.
6.An infra-red spectrum of the grout which was used in the laboratory tests. b. Forward a one gallon sample from production of each grout being submitted for prequalification to the Engineer of Tests. c. The information, test reports and test results obtained at the Materials and Research Center on samples submitted, will be reviewed by the Chief of Materials and Research. The manufacturer will be advised of the results. d. The Bureau of Materials and Research will maintain a list of prequalified products. Products that have been prequalified will remain prequalified as long as the formulation and manufacturing processes remain unchanged, and field experience indicates that the grout functions appropriately. Changes in formulation or manufacturing processes will require new prequalification testing. Failure of the material to function appropriately in the field will be cause for removal of the product from prequalified status. Products removed from prequalified status will be considered for requalification if the manufacturer can provide evidence that the cause of failure has been positively identified, and necessary formulation changes and/or quality control measures have been implemented to eliminate that cause. Complete prequalification testing may be required for products that have been removed from prequalified status.
1731.5 Basis of Acceptance
Prequalification as specified in subsection 1731.4. Receipt and approval of a Type C certification as specified in DIVISION 2600.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 838–839 of 978. View official source ↗