GB/T 24722-2020Glass beads for road markings (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 24722-2009 "Glass Beads for Road Marking". Compared with GB/T 24722-2009, except for editorial changes The main technical changes are as follows:

---Modified the definitions of sprinkled glass beads, premixed glass beads, and coated glass beads (see 3.1, 3.2, 3.3, 3.1, 3.2, 3.3);

---Added the terms and definitions of defective glass beads and rainy night glass beads (see 3.4, 3.5);

--- Deleted the classification of coated glass beads and ordinary glass beads (see 4.1.3 of the 2009 edition);

---According to the different particle size distribution, No. 4 glass beads are added (see 4.1.3);

---Modified the method of indicating the particle size of glass beads (see Table 1, Table 1 of the 2009 edition);

---Modified the product use of No. 2 glass beads (see 4.2.2, 4.2.2 of the 2009 edition);

---Added the use of No. 4 glass beads (see 4.2.4);

---Modified the technical requirements for appearance (see 5.1, 5.1 of the 2009 edition);

---Modified the technical requirements for the roundness rate, increased the technical requirements for the percentage of defective glass beads, and merged the two items into "roundness rate/ Percentage of defective glass beads" (see 5.2, 5.3 of the 2009 edition);

--- Added reference selection rules for glass beads with suitable particle size distribution (see 5.3);

---Modified the technical requirements for density (see 5.4, 5.4 of the 2009 edition);

--- Modify the requirements of waterproof coating to moisture-proof coating performance (see 5.8, 6.10, 5.8, 6.10 of the 2009 edition)

---Added the technical requirements for lead content (see 5.9);

---Added the technical requirements for arsenic content (see 5.10);

---The technical requirements for antimony content have been added (see 5.11);

---Modified the preparation of the sample (see 6.1, 6.1 of the 2009 edition);

--- Deleted the schematic diagram of the two splitter structure (see Figure 1 in the 2009 edition);

---Modified the test working temperature (see 6.2, 6.2 of the 2009 edition);

---The test method for the percentage of defective glass beads has been added (see 6.4.2);

--- Added particle size tester method for testing particle size distribution (see 6.5.2);

---Modified the immersion method for refractive index test (see 6.7.1, 6.7 of the 2009 edition);

--- Added secondary rainbow method for refractive index test (see 6.7.2);

---Added the lead content test method (see 6.11);

---Added arsenic content test method (see 6.12);

---Added the antimony content test method (see 6.13);

---Modified the inspection rules (see Chapter 7, Chapter 7 of the 2009 edition);

---Modified the requirements of the logo (see 8.1, 8.1 of the 2009 edition);

---Modified packaging requirements (see 8.2, 8.2 in the 2009 edition);

---Modified the transportation requirements (see 8.3, 8.3 of the 2009 edition);

---Added the main defect form of glass beads (see Appendix A);

---Added No. 1, No. 2, No. 3, No. 4 glass beads and other particle size distribution glass beads selection rules and test methods (see Appendix B);

---Revised the standard screen mesh size and mesh number comparison table (see Appendix C, Appendix A of the 2009 edition).

1 Scope

This standard specifies the product classification and use, technical requirements, test methods, inspection rules, and signs and packages of glass beads for pavement marking. Requirements for loading, transportation and storage.

This standard applies to the production, inspection and use of glass beads for road marking paint.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 6003.1 Technical Requirements and Inspection of Test Sieve Part 1. Metal Wire Woven Mesh Test Sieve

GB/T 16311 Road traffic marking quality requirements and testing methods

GB/T 33503 Chemical composition analysis method of lead-containing glass

JT/T 674 glass bead selector

JT/T 1035.1-2016 Glass beads for road retroreflective materials Part 1. General rules

3 Terms and definitions

The following terms and definitions apply to this document.