The Technical Specifications for Modified Emulsified Asphalt Tack Coat aim to clarify material, construction, and quality control requirements to ensure that projects meet technical standards. The following content details the relevant technical requirements.
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I. Material Requirements
The modified emulsified asphalt tack coat consists of asphalt, emulsifier, modifier, and water. The asphalt should preferably be petroleum asphalt with a needle penetration range of 40 to 60 and a softening point of no less than 45°C. A slow-breaking cationic emulsifier should be used to ensure stable dispersion of asphalt particles in the aqueous phase. The modifier can be a polymer, such as styrene-butadiene-styrene block copolymer, with a dosage generally ranging from 3% to 5% of the asphalt mass. Use clean tap water free of impurities and corrosive components.
The material should be stored in a sealed container, away from sunlight and high temperatures. The storage temperature should be maintained between 5°C and 40°C, and the storage period should not exceed 30 days. Before use, sampling and testing are required. Testing criteria include evaporation residue content, sieve residue, storage stability, and adhesion and toughness. The evaporation residue content should be greater than 55%, the sieve residue should not exceed 0.1%, and the storage stability difference after one day should be less than 1%.
II. Construction Preparation
Before construction, the base layer must be inspected to ensure that the surface is flat, dry, and clean, free of loose materials or oil stains. Cracks in the base layer exceeding 5 mm in width must be caulked. Environmental conditions during construction require a temperature of no less than 10°C and a relative humidity of less than 85%. Construction should not be carried out in rainy or windy conditions.
Equipment required includes an asphalt spreader, an emulsified asphalt storage tank, mixing equipment, and a temperature control device. The spreader must be equipped with a precise metering system to ensure a spread rate error within ±5%. Before construction, the equipment must be cleaned and adjusted to ensure there is no residue or blockage.

III. Construction Techniques
The spread rate depends on the base layer type and project requirements, generally ranging from 0.3 to 0.6 kg per square meter. Before spreading, the modified emulsified asphalt must be thoroughly mixed for at least 10 minutes. The spreader speed should be controlled between 3 and 6 kilometers per hour. The spreading width should be adjusted according to the equipment specifications, with an overlap of no more than 10 centimeters.
Gravel should be spread immediately after spreading. The particle size should be 3 to 5 mm, and the spreading rate should be 5 to 8 kilograms per square meter. After spreading, the road should be compacted using a roller at a speed not exceeding 5 kilometers per hour, with two to three passes. After compaction, traffic should be closed and the road should be cured for at least 24 hours.
IV. Quality Control
On-site inspections must be conducted during construction, including checking the spread rate, temperature measurement, and uniformity assessment. Samples should be collected at least three locations per 1,000 square meters of spread area. Equipment parameters should be adjusted if the spread rate deviation exceeds the allowable range. Temperature measurements should be made using an infrared thermometer, and the spreading temperature should be between 50 and 70 degrees Celsius.
Acceptance testing is required upon completion, covering bond strength, shear strength, and water permeability. Bond strength is tested using a pull-off tester, with a standard value of no less than 0.4 MPa. Shear strength is tested using a shearing device, with a standard value of no less than 0.6 MPa. Water permeability is tested using a water permeameter, with a standard value of no more than 50 ml/min.
V. Safety and Environmental Protection
Construction personnel must wear protective equipment, including gloves, goggles, and work clothes. Warning signs must be posted on site to prevent unauthorized access. Waste disposal must comply with environmental protection requirements. Leftover materials and cleaning waste must be collected and handled by a professional organization.
Dust and noise pollution must be controlled during construction, and watering and dust suppression measures must be continuously implemented. Equipment maintenance must be performed regularly to ensure that emissions meet environmental standards.
VI. Acceptance Criteria
Project acceptance requires submission of material test reports, construction records, and quality control documents. Acceptance criteria refer to relevant technical specifications, and unqualified parts must be reworked. Final acceptance must be jointly confirmed by all parties involved, and the acceptance documents must be signed.
The above are the basic requirements of the modified emulsified asphalt tack coat technical specifications and may require adjustment and refinement based on specific project conditions.