JT/T 797-2019 English PDFUS$289.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. JT/T 797-2019: Ground vulcanized rubber of scrap tires for highway engineering Status: Valid JT/T 797: Historical versions
Basic dataStandard ID: JT/T 797-2019 (JT/T797-2019)Description (Translated English): Ground vulcanized rubber of scrap tires for highway engineering Sector / Industry: Highway & Transportation Industry Standard (Recommended) Classification of Chinese Standard: P66 Word Count Estimation: 12,134 Date of Issue: 2019-12-24 Date of Implementation: 2020-03-01 Older Standard (superseded by this standard): JT/T 797-2011 Issuing agency(ies): Ministry of Transport JT/T 797-2019: Ground vulcanized rubber of scrap tires for highway engineering---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.b) Flatten the rubber powder with a glass rod, cover the magnet with a smooth surface paper, move the magnet evenly on the surface of the sample, and stay there. Less than 15s; c) Remove the magnet from the paving area of the waste tire rubber powder, tap the magnet lightly, and shake off the adhered waste tire rubber powder; d) Move the magnet over the designated container, remove the magnet, put the adsorbed metal substance into the container, the waste tire rubber powder sample should not be Contains visually visible wires; e) Repeat the process from a) to d) 3 to 4 times until the rubber powder adhered on the magnet surface is scattered after tapping, and the total weight is weighed. Metal weight G4. 6. 5． 3 Result calculation The iron content is calculated according to formula (4). B = G4 G3 × 100 (4) In the formula. B --- metal content (%); G4 --- the mass of the metal adsorbent, the unit is gram (g); G3 --- the mass of the sample before adsorption, in grams (g). 6. 6 fiber content The test method of fiber content is according to 6. 2． 4 Method of sieving, the fiber balls formed by the fibers gathered in each layer of sieve with sharp-nose tweezers Take out, if the fiber ball is covered with waste tire rubber powder, first place the fiber ball on the flat glass plate, shake the plate, and wrap the waste tire wrapped around the fiber ball The rubber powder is removed, and the fiber properties are observed, and the measurement is performed according to the method of GB/T 19208-2008. 6. 7 Ash The ash content is according to GB/T 4498. 1 method for determination. 6. 8 acetone extract The acetone extract was measured according to the method of GB/T 3516. JT/T 797-2019 6. 9 Carbon black content and rubber hydrocarbon content The content of rubber hydrocarbon and carbon black is according to GB/T 14387. 1 thermogravimetric analysis. 6. 10 solubility Solubility was measured in accordance with Appendix A. 6. 11 Particle size identification Waste tire rubber powder for road use According to the mesh size method of R20 series in GB/T 5330, according to the sieve holes and raw materials corresponding to the particle size Line ID. 7 Inspection rules7. 1 Inspection classification and inspection items 7. 1． 1 Inspection type inspection and factory inspection, see Table 4 for inspection items. When using road modified waste tire rubber powder, the solubility index should be Target detection. Table 4 Type inspection and factory inspection items Technical requirements for test items Test methods Type inspection Factory inspection 1 Appearance 1 6. 1 ＋ ＋ 2 Screening residue 5. 2 6. 2 ＋ ＋ 3 Relative density 2 6. 3 ＋ ＋ 4 Moisture content 2 6. 4 ＋ ＋ 5 Iron content 2 6. 5 ＋ ＋ 6 Fiber content 2 6. 6 ＋ ＋ 7 Ash content 5. 3 6.6. 7 ＋ ＋ 8 acetone extract 5. 3 6.6. 8 ＋ ＋ 9 Rubber hydrocarbon content 5. 3 6.6. 9 ＋ ＋ 10 carbon black content 3 6.6. 9 ＋ ＋ 11 Solubility 5. 3 6.6. 10 ＋ ＋ Note. "+" indicates items that need to be checked; "-" indicates items that don't need to be checked. 7. 1． 2 Type inspection shall be carried out in the following cases. a) when production processes change; b) When there are major changes in the structure, materials and processes of the product, which may affect the performance of the product; c) when there is a significant difference between the factory inspection results and the last type inspection; d) when required by relevant management departments. JT/T 797-2019 7. 2 Group approval and sampling 7. 2． 1 batch Waste tire rubber powder should be spot-checked for chemical indicators every.200t, and physical indicators should be checked for every 50t batch. 7. 2． 2 Sampling Product inspection is based on batches, and no less than 500g samples are randomly selected from each batch of products. 7. 3 Judgment rules 7. 3． 1 If all items of type inspection and factory inspection meet the requirements of Table 1 and Table 2, the batch of products is judged to be qualified. 7. 3． 2 If any of the type inspection and factory inspection items do not meet the requirements of Tables 1 and 2, they should be re-extracted twice in this batch. A number of samples are re-inspected. If the re-inspection is all qualified, the batch of products is qualified; if the re-inspection still fails, the batch of products is judged to be unqualified. 8 Marking, packaging, transportation and storage 8. 1 Sign At least the following information should be given on the product packaging. a) the name and trademark of the manufacturing plant; b) the number of this standard; c) product name; d) product lot number; e) production date; f) mesh number; g) type code and crushing process of waste tire rubber powder; h) Production process. 8. 2 Packaging 8. 2． 1 Waste tire rubber powder is packed in bags, and its inner packaging material should be a sealed moisture-proof structure. 8. 2． 2 Each batch of products should have a product certificate, which includes. product code and crushing process, trademark, model, production date, health Production batch number and physical and chemical technical indicators of the product. 8. ３ Transportation Waste tire rubber powder should be covered during transportation and storage. It is strictly prohibited to transport it with acids, alkalis, oils and other substances that affect the quality of the product. And storage, transportation and storage environment temperature should be lower than 50 ℃, more than 1m away from the heat source, and a certain distance from the ground and walls. 8. 4 Storage 8. 4． 1. Waste tire rubber powder should be stored in a ventilated and dry warehouse, and effective anti-leaching, moisture-proof and fire prevention measures should be taken. 8. 4． 2. The on-site storage time of waste tire rubber powder generally does not exceed 180d. JT/T 797-2019Appendix A(Normative appendix) Solubility test method A. 1 Instrument and solvent The Soxhlet extractor is composed of an extraction bottle, an extraction tube, and a spherical condenser. There are siphon tubes and connecting tubes on each side of the extraction tube. Some connections are tight and airtight. The solvent used in this method is trichloroethylene. A. 2 test steps The following steps should be used to determine the solubility of waste tire rubber powder. a) Insert the sampler into the center of the packaging bag and take out about 50g of sample. Take three samples in total, with a total mass of about 150g, and put it in polyethylene plastic. In the bag, mix evenly, take 3 samples from it in parallel, and weigh 3g to 5g samples, accurate to 0. 1mg, its mass is recorded as m0; b) Wrap the sample with a dry slow quantitative filter paper (diameter not less than 150 mm), fasten it with a thread, and weigh the analytical balance. Measured as m1; c) Put the wrapped sample into the Soxhlet extractor; d) Add the trichloroethylene solvent to the flask of the Soxhlet extractor, and the amount is 1/2 to 2/3 of the flask capacity. Turn on the heating device and cold Discard the water, adjust the extraction speed, and control the number of times that the distilled solvent refluxed from the extraction cup is 10 to 20 times per hour. 24h ± 0. 5h; e) After heating, turn off the heating device and cooling water, and remove the extraction device. Take out the filter paper bag carefully without rupture, and put it in the air Allow the solvent to evaporate for more than 30 minutes, and then dry it in a blast oven at a temperature of 105 ° C ± 2 ° C for 2h. Then put in dry In a desiccator, cool to room temperature, weigh with an analytical balance, and record its mass as m2; f) The other two samples have been taken to maintain the consistency of the material. Repeat the above steps for a total of three tests. Extremely easy in the test Rupture causes insoluble matter to leak, the measured data is inaccurate, and the test must be repeated. A. 3 Calculation and data processing Record the measurement results of each sample, then calculate the result Pn of each sample according to the following formula, and finally take the flatness of three samples. Mean P. The content of trichloroethylene solubles in rubber powder for modified asphalt is calculated according to formula (A.1) and formula (A.2). Pn = m1-m2 m0 × 100 (A. 1) P = P1 + P2 + P3 3 × 100 (A. 2) Where. Pn --- soluble content of sample n (%); m0 --- the mass of the sample taken in advance, the unit is gram (g); m1 --- mass of advance sample + filter paper, unit is gram (g); m2 --- mass of sample + filter paper after extraction, unit is gram (g); P --- the soluble content of the sample (%). JT/T 797-2019 ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JT/T 797-2019_English be delivered?Answer: Upon your order, we will start to translate JT/T 797-2019_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version JT/T 797-2019?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JT/T 797-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
