Material property and quality control specifications for elastomeric concrete used at bridge deck joints : final report - Page 19 |
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12
3 SAMPLE PREPARATION AND TESTING
The test methods selected here focus on the aggregate, cured binder, and finally cured elastomeric
concrete ( EC). The ten methods which were followed during Phase I of the project on the products are
listed as follows:
1. Sieve Analysis ( Aggregate)
2. Tensile Properties of Plastics ( Binder)
3. Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ( Binder)
4. Compressive Properties of Rigid Plastics ( EC)
5. Splitting Tensile Strength ( EC)
6. Rubber Property – Durometer Hardness ( EC)
7. Bond Strength of Epoxy- Resin Systems Used With Concrete By Slant Shear ( EC)
8. Impact Resistance ( EC)
9. Water Absorption of Plastics ( EC)
10. Shrinkage ( EC)
One of the most difficult tasks in fabricating the specimens was finding a way to release the specimen
from the mold without damaging the specimen, especially the binder samples. A release gel made by
Dow Corning was used on the molds in order for the specimens to be removed from the molds without
causing any damage to the specimens. In order for the materials to be tested according to the governing
specifications, various molds and die cutters had to be fabricated and/ or purchased. Once the ( binder and
EC) specimens had cured for a minimum of seven days, testing would take place. The following sections
provide a detailed description of the sample preparation and test procedures followed.
3.1 Product Mixing And Specimen Fabrication
Great effort was made to ensure that all of the products were mixed following the manufacturers’
instructions and under the most optimum laboratory conditions. New mixing buckets and containers were
used for each batch, and the mixing drills and molds were thoroughly cleaned after each use. In order to
be more efficient, and to allow remixing a batch if necessary, the batches were mixed in smaller batches
using the proper weight ratios obtained from each manufacturer.
The preparation of all of the products followed the same general steps:
1. Open binder containers and slowly stir containers separately for approximately 20- 30 seconds to
offset any settling which may have taken place in the container during storage/ shipment
2. Weigh out the exact amount needed from parts A, B and C ( as applicable)
3. Binder Only:
a. Mix binder parts together for a specified time in a clean container
b. Pour mixed binder into mold and let the specimens sit for 24 hrs
4. Binder and Aggregate:
a. Mix binder parts together for specified time in a clean 5 gallon bucket ( 20- 30 sec)
b. Slowly pour in aggregate while continuously mixing for the specified amount of time and
until a uniform mix is reached ( 2- 3 min)
c. Place mixed elastomeric concrete in molds and let the specimens sit for 24 hrs
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| Title | Material property and quality control specifications for elastomeric concrete used at bridge deck joints : final report - Page 19 |
| Full Text | 12 3 SAMPLE PREPARATION AND TESTING The test methods selected here focus on the aggregate, cured binder, and finally cured elastomeric concrete ( EC). The ten methods which were followed during Phase I of the project on the products are listed as follows: 1. Sieve Analysis ( Aggregate) 2. Tensile Properties of Plastics ( Binder) 3. Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ( Binder) 4. Compressive Properties of Rigid Plastics ( EC) 5. Splitting Tensile Strength ( EC) 6. Rubber Property – Durometer Hardness ( EC) 7. Bond Strength of Epoxy- Resin Systems Used With Concrete By Slant Shear ( EC) 8. Impact Resistance ( EC) 9. Water Absorption of Plastics ( EC) 10. Shrinkage ( EC) One of the most difficult tasks in fabricating the specimens was finding a way to release the specimen from the mold without damaging the specimen, especially the binder samples. A release gel made by Dow Corning was used on the molds in order for the specimens to be removed from the molds without causing any damage to the specimens. In order for the materials to be tested according to the governing specifications, various molds and die cutters had to be fabricated and/ or purchased. Once the ( binder and EC) specimens had cured for a minimum of seven days, testing would take place. The following sections provide a detailed description of the sample preparation and test procedures followed. 3.1 Product Mixing And Specimen Fabrication Great effort was made to ensure that all of the products were mixed following the manufacturers’ instructions and under the most optimum laboratory conditions. New mixing buckets and containers were used for each batch, and the mixing drills and molds were thoroughly cleaned after each use. In order to be more efficient, and to allow remixing a batch if necessary, the batches were mixed in smaller batches using the proper weight ratios obtained from each manufacturer. The preparation of all of the products followed the same general steps: 1. Open binder containers and slowly stir containers separately for approximately 20- 30 seconds to offset any settling which may have taken place in the container during storage/ shipment 2. Weigh out the exact amount needed from parts A, B and C ( as applicable) 3. Binder Only: a. Mix binder parts together for a specified time in a clean container b. Pour mixed binder into mold and let the specimens sit for 24 hrs 4. Binder and Aggregate: a. Mix binder parts together for specified time in a clean 5 gallon bucket ( 20- 30 sec) b. Slowly pour in aggregate while continuously mixing for the specified amount of time and until a uniform mix is reached ( 2- 3 min) c. Place mixed elastomeric concrete in molds and let the specimens sit for 24 hrs |
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