Material property and quality control specifications for elastomeric concrete used at bridge deck joints : final report - Page 74 |
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67 important to note that the 5% deflection resilience minimum requirement is listed for the test methods described in this study. Table 7- 2 shows the current NCDOT minimum requirements in comparison to the newly proposed minimum requirements of a complete elastomeric concrete mix. It is clear from Table 7- 3 that 3 products satisfy the new requirements except the binder ultimate elongation value, which might still be too conservative ( and is related to the splitting tensile strength, for which the proposed new limit is being met by only 4 products). Binder ultimate elongation might not be as relevant to product long- term performance; however, without further durability tests the current minimum value should not be changed. Table 7- 2. Comparison of existing and proposed minimum requirements Testing Method Existing NCDOT Min. Requirements Proposed Min. Requirements Tensile Strength ( psi) 800 1000 Tear Strength ( lb/ in) 90 200 Ultimate Elongation (%) 150 150 Compressive Strength ( psi) 2800 2200 5% Deflection Resilience - 95 Splitting Tensile Strength ( psi) - 625 Bond Strength ( psi) 450 450 Impact Resistance ( ft- lbs) 7 - Durometer Hardness - 50 Table 7- 3. Lab mixed results compliance with proposed NCDOT specifications Product Binder Tensile Binder Ult. El. Binder Tear EC Compr. EC 5% Defl. EC Split T. EC Bond EC Hardness Ply- Krete √ √ √ √ Ply- Krete HT √ √ √ √ √ √ Ply- Krete HS √ √ √ √ √ √ √ Ply- Krete LV √ √ √ √ √ √ √ E- Crete 57 √ √ √ Ceva Crete √ √ √ √ √ √ WaboCrete II √ √ √ √ √ √ ProCrete NH √ √ √ √ √ √ √ ProCrete Plus √ √ √ √ √ DelCrete √ √ Tron- Flex √ √ √
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Title | Material property and quality control specifications for elastomeric concrete used at bridge deck joints : final report - Page 74 |
Full Text | 67 important to note that the 5% deflection resilience minimum requirement is listed for the test methods described in this study. Table 7- 2 shows the current NCDOT minimum requirements in comparison to the newly proposed minimum requirements of a complete elastomeric concrete mix. It is clear from Table 7- 3 that 3 products satisfy the new requirements except the binder ultimate elongation value, which might still be too conservative ( and is related to the splitting tensile strength, for which the proposed new limit is being met by only 4 products). Binder ultimate elongation might not be as relevant to product long- term performance; however, without further durability tests the current minimum value should not be changed. Table 7- 2. Comparison of existing and proposed minimum requirements Testing Method Existing NCDOT Min. Requirements Proposed Min. Requirements Tensile Strength ( psi) 800 1000 Tear Strength ( lb/ in) 90 200 Ultimate Elongation (%) 150 150 Compressive Strength ( psi) 2800 2200 5% Deflection Resilience - 95 Splitting Tensile Strength ( psi) - 625 Bond Strength ( psi) 450 450 Impact Resistance ( ft- lbs) 7 - Durometer Hardness - 50 Table 7- 3. Lab mixed results compliance with proposed NCDOT specifications Product Binder Tensile Binder Ult. El. Binder Tear EC Compr. EC 5% Defl. EC Split T. EC Bond EC Hardness Ply- Krete √ √ √ √ Ply- Krete HT √ √ √ √ √ √ Ply- Krete HS √ √ √ √ √ √ √ Ply- Krete LV √ √ √ √ √ √ √ E- Crete 57 √ √ √ Ceva Crete √ √ √ √ √ √ WaboCrete II √ √ √ √ √ √ ProCrete NH √ √ √ √ √ √ √ ProCrete Plus √ √ √ √ √ DelCrete √ √ Tron- Flex √ √ √ |