JT/T 798-2019_English: PDF (JT/T798-2019)
| Standard ID | USD | BUY PDF | Lead-Days | Standard Title (Description) | Status |
| JT/T 798-2019 | 239 |
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Crumb rubber asphalt for highway engineering
| Valid |
| JT/T 798-2011 | 599 |
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Asphalt rubber for highway engineering
| Obsolete |
| Standard ID | JT/T 798-2019 (JT/T798-2019) | | Description (Translated English) | Crumb rubber asphalt for highway engineering | | Sector / Industry | Highway & Transportation Industry Standard (Recommended) | | Classification of Chinese Standard | P66 | | Word Count Estimation | 10,147 | | Date of Issue | 2019-12-24 | | Date of Implementation | 2020-03-01 | | Older Standard (superseded by this standard) | JT/T 798-2011 |
JT/T 798-2019
Crumb rubber asphalt for highway engineering
Contents
Foreword Ⅱ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Classification 1
5 Technical requirements 2
6 Test method 3
7 Inspection rules 4
8 Marking, transportation and storage 5
JT/T 798-2019
Foreword
This standard is in accordance with GB/T Draft the rules given in 1-2009.
This standard replaces JT/T 798-2011 "road engineering waste rubber powder rubber asphalt". Compared with JT/T 798-2011, except for editing
Apart from the modifications, the main technical content changes are as follows.
--- Revised the definition of waste rubber tire rubber asphalt (see 3.1, 3.1 of the.2011 edition);
--- Added the definitions of polymer rubber powder composite modified asphalt and modified rubber powder rubber asphalt (see 3.2 and 3.3);
--- Modified the definition of admixture (see 3.4, 3.2 of the.2011 edition);
--- Increased classification (see Chapter 4);
--- Added technical requirements for polymer rubber powder composite modified asphalt and modified rubber powder rubber asphalt (see Tables 2 and 3);
--- Modified the viscosity detection method (see 6.2, 5.2 of the.2011 edition);
--- Deleted rubber asphalt processing method, 180 ° C rotational viscosity measurement method and portable viscometer viscosity measurement method (see.2011)
(Appendix A, Appendix B, and Appendix C).
This standard is proposed and managed by the National Technical Committee for Traffic Engineering Facilities (Highway) Standardization (SAC/TC 223).
This standard was drafted. Highway Research Institute of the Ministry of Transport, Beijing Municipal Road and Bridge Building Materials Group Co., Ltd., Sichuan Jinmoer Environmental
New Materials Co., Ltd., China Road and Bridge Engineering Co., Ltd., Xinjiang Communications Construction Group Co., Ltd., Jiangxi Expressway
Investment Group Co., Ltd., Gansu Road and Bridge Construction Group Co., Ltd., CNOOC Refining & Chemical Co., Ltd., Zengda Highway Maintenance Pipeline in Anhui Province
Management Co., Ltd.
The main drafters of this standard. Wang Xudong, Zhang Lei, Zhou Xingye, Liu Hao, Xiao Qian, Li Zhiqiang, Huang Yong, Xu Bing, Cao Gui, Wang Jinfeng, Shan Lingyan,
Guan Wei, Ju Xiuying, Li Gang, Zhan Zhong, and Qiao Chaozeng.
The previous versions of the standards replaced by this standard are.
--- JT/T 798-2011.
JT/T 798-2019
Asphalt rubber powder for road use
1 Scope
This standard specifies the classification, technical requirements, test methods, inspection rules, and marking, transportation, and storage of waste rubber powder for road use.
Deposit and other requirements.
This standard is applicable to the production, inspection and use of asphalt rubber powder for road use.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 6326 Tire terms and definitions
GB/T 11147 Asphalt sampling method
GB/T 19208 vulcanized rubber powder
JT/T 997 Road tire vulcanized rubber powder
JT G E20 Highway Engineering Asphalt and Asphalt Mixture Test Procedures
JT G F40 Technical specifications for highway asphalt pavement construction
3 Terms and definitions
The terms and definitions defined in GB/T 6326, GB/T 19208 and the following terms apply to this document.
3． 1
Waste tire rubber powder asphalt (asphalt rubber) crumbber asphart (asphalt rubber)
Waste tire rubber powder and asphalt (may also be added with a certain proportion of admixtures) through on-site processing, using special equipment in a certain proportion
And the products that meet the requirements of relevant technical indicators.
3． 2
Polymer rubber powder compound modified asphalt polymer crumble rubber mold asphalt
Waste tire rubber powder and polymer are mixed with asphalt in a certain proportion, supplemented with stabilizer, and compound modified asphalt produced by factory processing technology.
3． 3
Modified rubber powder rubber pitch mode crumbber asphalt
Modified waste tire rubber powder and asphalt (may also be added with a certain proportion of admixtures), mixed with on-site or factory-specific equipment in a certain proportion
And the products that meet the requirements of relevant technical indicators.
3． 4
Admixture agent
A material added in a certain proportion during processing to improve the performance of waste tire rubber powder asphalt.
4 Classification
Road used tire rubber powder rubber asphalt (hereinafter referred to as "rubber asphalt") is divided into.
JT/T 798-2019
a) waste rubber powder rubber asphalt;
b) polymer rubber powder composite modified asphalt;
c) Modified rubber powder rubber asphalt.
5 Technical requirements
5． 1 raw materials
5． 1． 1 Asphalt
Asphalt for the production of rubber asphalt shall be selected from Class A and B road petroleum asphalt or SBS modified asphalt in accordance with JT G F40.
5． 1． ２ Waste tire rubber powder and its content
5． 1． 2． 1 Waste rubber powder shall meet the requirements of JT/T 797.
5． 1． 2． 2 The rubber powder content of waste tire rubber powder rubber asphalt shall generally not be less than 20% of the asphalt quality (external admixture). For the calculation of the admixture ratio, see
Equation (1).
A =
mf
ml
× 100% (1)
Where. mf --- mass of waste tire rubber powder, unit is gram (g);
ml --- mass of base asphalt, unit is gram (g);
A --- admixture ratio.
5． 1． 2． 3 The rubber powder content of modified rubber powder rubber asphalt should generally not be less than 25% of the asphalt quality (external blending). For the calculation of the admixture ratio, see
Equation (1).
5． 1． 3 admixture
The admixture should meet the technical standards of the corresponding materials.
5． Physicochemical properties of rubber asphalt
5． 2． 1. Rubber asphalt can be produced in batch or continuous mode, which is suitable for on-site processing and can also be factory-integrated.
5． 2． 2 Technical specifications of waste rubber powder rubber asphalt shall meet the requirements of Table 1.
Table 1 Technical requirements for waste rubber powder rubber asphalt
Project Unit
skills requirement
Steel Deck Pavement in Cold and Hot Zones
Rotational viscosity at 180 ° C Pa · s 5 to 3. 0 2. 5 to 3. 5 3. 0 to 4 0 3. 0 to 4 Five
Penetration at 25 ° C (0.1mm, 100g, 5s) 60 ～ 80 50 ～ 70 40 ～ 60 40 ～ 60
Softening point ℃ ＞ 50 ＞ 58 ＞ 65 ＞ 65
Elastic recovery (25 ° C)% ＞ 50 ＞ 55 ＞ 60 ＞ 75
Ductility (5 ° C, 1cm/min) cm ＞ 10 ＞ 10 ＞ 5 ＞ 20
Note. Refer to JT G F40-2004 Appendix A for climatic zoning.
5． 2． 3 Technical specifications of polymer rubber powder composite modified asphalt shall meet the requirements of Table 2.
JT/T 798-2019
Table 2 Technical requirements of polymer rubber powder composite modified asphalt
Project unit technical requirements
Rotating viscosity Pa · s at 135 ℃ 2. 0 to 3. Five
Penetration at 25 ° C (0.1mm, 100g, 5s) 40 to 60
Softening point ℃ ＞ 65
Elastic recovery (25 ° C)% ＞ 80
Ductility (5 ° C, 5cm/min) cm> 20
Separation softening point ℃ ＜ 3
5． 2． 4 The technical index of modified rubber powder asphalt shall meet the requirements in Table 3.
Table 3 Technical requirements of modified rubber powder asphalt
Project unit technical requirements
Rotational viscosity at 180 ° C Pa · s 0 to 3. 0
Penetration at 25 ° C (0.1mm, 100g, 5s) 50 to 70
Softening point ℃ ＞ 60
Elastic recovery (25 ° C)% ＞ 60
Ductility (5 ° C, 5cm/min) cm> 20
6 Test method
6. 1 Sampling
According to GB/T 11147.
6. 2 Viscosity
6. 2． 1 Rubber asphalt testing is divided into indoor testing and on-site testing.
6. 2． 2 The indoor test is carried out according to the method T 0625 of JT G E20. A rotary viscometer is used, equipped with different types of rotors to measure different revolutions.
Viscosity of rubber asphalt at a low speed, and return to the relationship curve between the viscosity of rubber asphalt and the viscosity meter torque, take the viscosity of 50% torque as
Representative value of the viscosity of rubber asphalt.
6. 2． 3 The on-site viscosity test should be carried out by using a portable viscometer, and a rotary viscometer should be used to calibrate the portable viscometer indoors.
The temperature shall be controlled at 180 ° C ± 1 ° C. Within 20 minutes from sampling to the end of the test, the test time shall be recorded.
6. 3 Penetration
It is carried out according to T 0604 of JT G E20.
6. 4 softening point
It is carried out according to the method T 0606 of JT G E20.
6. 5 elastic recovery
It is carried out according to the method T 0662 of JT G E20.
JT/T 798-2019
6. 6 Ductility
It was carried out according to the T 0605 method of JT G E20, in which the stretch rate of waste rubber powder rubber asphalt was 1 cm/min.
6. 7 Isolated softening point
It is carried out according to the method T061 of JT G E20.
7 Inspection rules
7. 1 Inspection classification and inspection items
7. 1． 1. Waste rubber powder rubber asphalt and modified rubber powder rubber asphalt are divided into type inspection and factory inspection.
Table 4 Inspection items of waste rubber powder rubber asphalt and modified rubber powder rubber asphalt
Technical requirements for test items Test methods Type inspection Factory inspection
1 Rotary viscosity at 180 ° C 5. 2． 2. 5. 2． 4 6.6. 2 ＋ ＋
2 Needle penetration at 25 ° C 5. 2． 2,5. 2． 4 6.6. 3 +-
3 Softening point 5. 2． 2,5. 2． 4 6.6. 4 ＋-
4 Elastic recovery 2． 2,5. 2． 4 6.6. 5 +-
5 ductility 2． 2,5. 2． 4 6.6. 6 ＋-
Note. "+" indicates mandatory items; "-" indicates non-mandatory items.
7. 1． 2 Polymer rubber powder composite modified asphalt is divided into type inspection and factory inspection.
Table 5 Inspection items of polymer rubber powder composite modified asphalt
Techni......
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