[Technology] Performance index of hot melt type 3, 4 dry and wet reflective marking coatings

Catalogue

1 Range

2 Normative reference documents

3 Materials

4 Photometric properties

5 Construction Requirements

6 Quality Requirements

7 Quality Inspection

8 Appendix A (Total Organic Matter Test Method)

9 Appendix B (Particle Size Distribution Test Method)

10 Appendix C (Titanium Dioxide Content)

11 Appendix D (Test method for glass bead content in Finished product marking)

12 Appendix E (Test method for Retroreflection Performance of glass beads)

Radius

This standard specifies the quality of raw materials, construction technology, construction quality inspection and acceptance methods and indicators of the white (yellow) hot melt reflective marking of the road pavement administered by XXXXX.

This standard is applicable to the white (yellow) hot melt reflective marking on asphalt concrete and cement concrete pavement of new, renovated and expanded roads administered by XXXXX.

Normative reference document

The following documents are essential for the application of this standard. For dated references, only the dated version applies to this standard. For undated references, the most recent version (including all amendment orders) applies to this standard.

GB 2893  Safety colours

GB/T 3186  Sampling of raw materials for paints, cyan paints and paints and cyan paints

GB 5768.3   Road traffic signs and markings - Part 3: Road traffic marking

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

GB/T 21383  New road marking initial reverse reflection brightness coefficient and testing requirements

GB/T 24722  Road marking glass beads JTG F80 highway engineering quality inspection and evaluation standard

JTG H30   Road maintenance safety procedures

JT/T 280   Road marking coatings

JT/T 688   Reverse reflectance terminology

JT/T 690   Reverse reflectance performance test method

JT/T 691   Horizontal coating reverse reflectance coefficient test method

JT/T 692   Reverse reflector chroma performance test method at night

DB51/T2429   Rainy night road traffic reflective marking quality requirements and testing methods

GAT 298   Road marking paint

Materials

3.1 The coating used for road marking shall comply with the provisions of "Road Marking Coating" (JT/T 280). The marking materials used should meet the requirements of durable use on asphalt concrete and cement concrete pavement.
3.2 The chroma performance of road marking coatings shall meet the requirements of "Safety Color" (GB 2893), and its color coordinates shall meet the range specified in "Road Marking Coatings" (JT/T 280).
3.3 The hot-melt reflective coating and glass bead materials used in this standard, in addition to meeting all the requirements of the "Road marking coating" (JT/T280) and "Road marking glass bead" (GB/T 24722) standards, also need to meet the key technical indicators specified in Table 1, Table 2, Table 3 requirements:

Table 1 Technical requirements for inner mixing and surface spraying glass beads

Table 2 Technical requirements of hot melt class Ⅲ dry and wet continuous reflective marking coatings

3.4 Inspection, packaging, transportation and storage 3.4.1 Marking coatings shall comply with the technical specifications specified in "Road Marking Coatings" (JT/T 280) and this standard. The products on site must have a certificate, with instructions and precautions for use.
3.4.2 Line coating products shall be sampled according to Sampling of Color paint, blue paint and Raw Materials for Color paint and blue paint (GB/T 3186). The samples shall be divided into two parts, one for sealed storage for reference and the other for inspection and test. After passing the test, the samples shall be used as the basis for future comparison of incoming materials.
3.4.3 The marking coatings should be packed in EVA bags or double-layer bags lined with sealed plastic bags and woven bags, and the bag mouth should be tightly closed.
3.4.4 The marking paint should be kept ventilated and dry when stored, prevent direct sunlight, and isolate the fire source, and try to cool down when the temperature is too high in summer.
3.4.5 When the marking coating is transported, it must be prevented from rain and sun exposure, and comply with the relevant regulations of the transportation department.
3.4.6 Marking paint should be marked with storage period, beyond the storage period should be in accordance with the "road marking paint" (JT/T 280) of the project inspection, unqualified, shall not be used.
3.4.7 The packaging of glass beads should meet the following requirements: 1. Soft and wear-resistant jute bags or other textile bags should be used for packaging, which is lined with padding to ensure that it is not polluted or damaged in the transportation process. Each pack should contain not less than 25kg net weight glass beads. All packages should clearly indicate the type, quality (in kg), batch number and manufacturer's name of the glass beads. 2 The glass beads stored in the closed bag should have no caking phenomenon.

Photometric property

Hot melt road traffic reflective marking should have reverse reflection performance under dry and wet conditions, and have good visual recognition effect on rainy nights, and the technical index requirements of the reverse reflection brightness coefficient should meet the requirements of Table 4, Table 5, Table 6, Table 7, and can be carried out according to Table 4, Table 5, Table 6, table 7, hot melt type Ⅲ, Ⅳ dry and wet state continuous reflective road traffic marking engineering construction and quality acceptance.

Table 4 Brightness coefficient requirements for retroreflection of hot melt type Ⅲ dry and wet continuous reflective traffic marking

Table 5 Brightness coefficient requirements of hot melt type Ⅲ dry and wet continuous reflective traffic marking retroreflection during normal use

Table 6 Brightness coefficient of retroreflection of hot melt type Ⅳ dry and wet continuous reflective traffic marking newly applied

Table 7 Brightness coefficient requirements of hot melt type Ⅳ dry and wet state continuous reflective traffic marking retroreflection during normal use

Note: The reverse reflection marking measuring instrument should be selected with stable performance, unshielded test light source, and dry, wet, continuous rain testing function. The measuring error of the instrument should be calibrated by qualified departments according to the Service Manual of Highway Engineering Test and Testing Instruments and Equipment and JJG(Traffic)059-2004.

5 Construction Requirements

5.1 Old labels are cleared
5.1.1 Old marking Removal method The old marking should be removed by physical grinding and removing. The original pavement should be protected from damage. Encourage the use of new technology, new technology cleaning methods.
5.1.2 Device Requirements:
1 Line removal speed is not less than 0.4km/h.
2 Grinding head life is not less than 20km(normal use).
3 Power is not less than 340W.
5.2 Road marking and marking
5.2.1 Preparation before Marking 1 The surface of the road where the marking is set should be clean and dry, free of loose particles, dust, asphalt, oil, or other harmful substances. The wet pavement should be dried first.
5.2.2 Apply the lower coat
1 Before marking, it is necessary to apply a layer of undercoat on the pavement to be marked (newly constructed and pollution-free asphalt pavement can not be painted). The base oil product should be suitable for the coating. After brushing, the time should be strictly controlled, and the marking can be carried out after drying to improve its bonding force.
The performance of the lower coating agent shall comply with the provisions of Table 8, and the type of the lower coating agent shall be soluble with the type of hot melt marking coating. When brushing, the lower coating agent should be adjusted evenly and fully cover the construction surface.

The quality requirements of the coating are shown in Table 8

5.2.3 Coating heating
1 At the same time of lofting and coating primer, the hot melt type road sign paint into the vehicle hot melt kettle, uniform heating, stirring to 210 ~ 240℃, until the paint is completely melted, no caking segregation phenomenon, then the hot melt paint into the hot melt kettle of the scribing machine, the scribing machine hot melt kettle temperature is generally not less than 200℃ during the application process. If there are new materials, they should be operated according to the instructions for production and use of new materials.
5.2.4 Heating Device Requirements
1 cylinder single cylinder volume is not less than 600KG;
2 The tank must be equipped with the corresponding mixing equipment;
3 The tank heating device must have a precise temperature control system.
5.2.5 Line marking
The construction of the marking line should be carried out during the day, and the construction should be temporarily stopped when it is rainy or the temperature is below 5℃.
2 Lofting shall be carried out according to design requirements before implementation.
3 The spreading of glass beads should be confirmed by the test before implementation. Glass beads should be spread immediately after the paint is scraped. Surface glass beads need to be double-spread sowing process, the surface spread amount is ≥0.5kg/㎡ control, the D-HR glass beads in the front, Type 2 glass beads in the back, and synchronous with hot melt paint scraping.
4 All marking lines should have a straight, smooth, smooth, uniform and beautiful appearance, dry film thickness ≥2mm (including glass beads) control.
5 Defective, improper construction, incorrect size or incorrect location of the marking should be removed, the pavement should be repaired, the material should be replaced.
During road construction, it is necessary to operate according to the "Safety Operation Regulations for Highway Maintenance" (JTG H30), until the marking is fully dry, the traffic can be opened.
5.2.6 Application Device Requirements
1 The working volume of the paint barrel is not less than 40L.
2 The working volume of glass bead box is not less than 5L.
3 No less than 2 glass bead sowers.