Commonwealth of Pennsylvania PA Test Method No. 633 Department of Transportation October Pages LABORATORY TESTING SECTION. Method of Test for

Size: px

Start display at page:

Download "Commonwealth of Pennsylvania PA Test Method No. 633 Department of Transportation October Pages LABORATORY TESTING SECTION. Method of Test for"

Emmeline Matthews
5 years ago
Views:

1 Commonwealth of Pennsylvania PA Test Method No. 633 Department of Transportation 5 Pages LABORATORY TESTING SECTION Method of Test for MEASURING THE RESISTANCE OF 50 mm x 50 mm (2" X 2") CUBE SPECIMENS OF MORTAR TO SLOW FREEZING AND THAWING IN BRINE 1. SCOPE 1.1 This method of test covers the procedure for determining the resistance of 50 mm x 50 mm (2" x 2") cube specimens of mortar to alternate freezing and thawing while immersed in a brine of 10% by mass calcium chloride (USP or better) in water. It is intended to provide information as to the acceptability of concrete patching materials and grouts. 2. APPARATUS 2.1 Container- A suitable container (NOTE 1) of sufficient size to permit at least 6 specimens to be surrounded on 5 sides by not less than 13 mm (1/2") of the salt solution at all times during freezing and thawing. NOTE 1- A plastic dishpan may be found suitable 2.2 Freezing Apparatus- The freezing apparatus shall consist of a suitable chamber in which the specified container, salt solution, and specimens may be subjected to the specified freezing temperature of -18 ± 3 C (0 ± 5 F). The apparatus shall contain the necessary refrigerating equipment for maintaining this temperature range. 2.3 Thawing Area- The thawing area shall be relatively dust-free and have a temperature range of 24 ± 8 C (75 ± 15 F) to complete the thawing of the test specimens and salt solution within a 7 ± 1 hour period (NOTE 2). NOTE 2- Ordinary room temperature usually is sufficient for this purpose, but a 15 watt infra-red lamp may be used to accelerate the thawing. When one of these lamps is used, it shall be placed at a distance of at least 178 mm (7") from the test specimens and salt solution. The lamp may, however, be used immediately after removing the container from the freezing chamber. 3. TEST SPECIMENS 3.1 The specimens for use in this test usually are 50 mm x 50 mm (2" x 2") cubes made and cured in accordance with the applicable requirements of the Standard Method of Test for Compressive Strength of Hydraulic Cement-Mortars (Using 50 mm (2") Cube Specimens) ASTM Designation: C 109 (NOTE 3).

2 Page 2 NOTE 3- Due to the composition of some materials, (especially premixed aggregatecement compounds), a standard method of sample preparation cannot always be used. In those instances, the manufacturer's recommended procedure shall be used. 3.2 First, two (2) cubes are made using PENNDOT approved Type 1 Cement, Ottawa sand, and air entraining agent. Then (2) cubes are made with the product under consideration. All samples will be tested at the same time in accordance to ASTM Designation C 109. The cubes made with the PENNDOT approved Type 1 Cement shall be used for comparison, and as an aid in determining the acceptability of the product for its resistance to freezing and thawing. 3.3 After the initial 22 ± 2 hour storage in the moist closet, remove the specimens from the molds and individually identify by either number or other marking. Immerse the specimens in clean water in the storage tanks of the moist closet. Unless another age is specified, keep the specimens in the storage tanks for 13 days ± 6 hours to complete the 14 day curing period. 4. PROCEDURE 4.1 At the end of the specified curing period (Section 3.3), the specimen shall be removed from the storage tanks, surface dried with a damp cloth or towel, and weighed with the mass being recorded to the nearest 0.1 g (0.004 ounces). The specimens shall be protected from loss of moisture at all times by completely covering with a damp cloth or towel. 4.2 Place the specimens at random locations within the container and cover with the specified salt solution so that all specimens are surrounded on 5 sides by not less than 13 mm (1/2") of the solution (NOTE 4). NOTE 4- At no time during the test shall the salt solution be less than 64 mm (2½") in depth. 4.3 Place the container inside the freezing chamber for a period of 16 ± 2 hours. Maintain the temperature of the freezing chamber at -18 ± 3 C (0 ± 5 F) for the freezing period. 4.4 After the 16 ± 2 hour freezing period, remove the container and permit the contents to thaw at a temperature of 24 ± 8 C (75 ± 15 F) for a period of 7 ± 1 hours. 4.5 Alternately freeze and thaw the specimens as specified in Sections 4.3 and 4.4. At the end of the thawing phase of each five cycles, remove the specimens, one at a time, rinse with clean water to remove all traces of brine, surface dry with a damp cloth or towel, and weigh. Record the mass to the nearest 0.1 g (0.004 ounces) and return the specimens to random positions in the container. Care shall be taken to prevent loss of moisture during the weighing operation by covering completely the samples with a damp cloth or towel if not returned directly to the container.

3 Page Unless a different number of cycles have been specified, the test specimens shall be subjected to 25 cycles of alternate freezing and thawing (NOTE 5). NOTE 5- Testing shall be terminated if during testing a loss greater than that anticipated or other wise designated is encountered. 5. CALCULATIONS 5.1 Calculations shall he made upon the completion of each 5 cycles to determine the percent loss during those cycles. Determine the total percent loss at the end of the testing period. 5.2 Calculate the percent of loss by using the following formula: Where: L = W X W x 100 L = W = X = Percent Loss Mass of the specimen at 0 cycles Mass of the same specimen after completion of each testing period (5 cycles, then at 10 cycles, etc., up to and including final cycle). 5.3 To be acceptable, the average percent loss of the cubes made with the product being evaluated must be 8% or less, at the end of 25 cycles.

4 Page 4 6. REPORT 6.1 The report shall include the following data for both the standard cubes and the cubes made with the product under consideration: A. Curing Process, (if other. than that specified in Sections 3.1 and 3.3) B. Mass at 0 cycles C. Mass and percent of loss after each 5 cycles D. Source of the cement used in the standard cubes: Plant and Bin Number E. Actual amount of water added to the mass of the material under test to make the mortar cubes.

5 This page left intentionally blank PTM No. 633 Page 5

Curing as a Single Special Process Regulatory Agency Jurisdiction NAME (fill in form)

Single Hazard Special Process HACCP Template for Curing as a Single Special Process Regulatory Agency Jurisdiction NAME (fill in form) Date Submitted Date Approved Valid until A. General Information This