Asphalt emulsifier is commonly used in highway maintenance and preventive maintenance construction, and is a commonly used highway maintenance material. So, what are the inspection standards and technical indicators for asphalt emulsifier? Below, Longteng Road, a manufacturer of asphalt emulsifiers, will provide you with a detailed explanation.
1. Inspection standards for asphalt emulsifiers
The inspection standards for asphalt emulsifiers mainly include the following aspects:
(1) Appearance inspection: The emulsifier should be a milky white liquid with no mechanical impurities, layering, discoloration, precipitation, or other phenomena.
(2) Stability testing: Emulsifiers should have good stability and should not exhibit precipitation or stratification.
(3) Five day preparation: High quality emulsifiers can produce stable emulsified asphalt within five days.
(4) Gel time: Generally, the gel time at 4 ℃ is taken as a reference. The shorter the gel time, the better the dispersing ability of emulsifier to asphalt.
(5) Emulsification effect: Emulsifiers should be able to disperse asphalt in water, with good emulsification effect and no precipitation or layering phenomenon.
(6) Adhesion: The compatibility between emulsifier and asphalt should be good, and it should be able to stably emulsify asphalt.
(7) Five day preparation: The prepared emulsified asphalt generally has good weather resistance and is not prone to leakage.
2. Specific inspection items and methods
Viscosity, sieve residue, adhesion, mixing stability, cement mixing test, charge, asphalt content, pH value, penetration, ductility, solubility of evaporated residue, etc. Storage stability and freezing stability tests must be conducted when the storage time exceeds five days and during winter construction.
3. Technical indicators of different types of asphalt emulsifiers
(1) Quick cracking asphalt emulsifier: It appears as a yellow liquid, with an active ingredient content of 70 ± 5%, a pH value of 2-3, and a suitable dosage of 3-5 ‰.
(2) Medium cracking asphalt emulsifier: appearing as a light yellow or white paste, with an active content of 50 ± 5%, a pH value of 6-7, and a suitable dosage of 0.6-1.2%.
(3) Slow cracking asphalt emulsifier, the technical indicators of slow cracking asphalt emulsifier mainly include the following aspects:
A. Physical properties: The physical properties of slow cracking asphalt emulsifiers include appearance, viscosity, density, etc. For example, the appearance of XT-A3 type anionic slow cracking asphalt emulsifier is transparent semi-solid or viscous, with an active substance content of ≥ 50% and easy solubility in water.
B. Chemical indicators: Chemical indicators include active substance content, pH value, etc. For example, the pH value of XT-A3 type anionic slow cracking asphalt emulsifier is 7-8, and the pH value of slow cracking and fast setting cationic asphalt emulsifier is 2.0-3.0.
C、 Instructions for use: The instructions for use include the ratio of emulsifier to asphalt, water, etc. For example, in the typical formula of slow cracking and fast setting cationic asphalt emulsifier, asphalt accounts for 60-80%, emulsifier accounts for 1.5-2.0%, and water accounts for 40%.
D. Stability: The stability of slow cracking asphalt emulsifiers is an important indicator during their use and can be evaluated through stability tests. Stability tests include centrifugal tests, freeze-thaw tests, thermal stability tests, and other aspects.
These technical indicators are important basis for evaluating the performance and application value of slow cracking asphalt emulsifiers. In practical applications, suitable slow cracking asphalt emulsifiers should be selected according to different usage environments and requirements to achieve the best results.
