I. Preparation before the test
1. According to the construction requirements, determine the asphalt emulsification index and standard of the test, and select appropriate test conditions.
2. Prepare the required instruments and reagents, including electronic scales, spreading boxes, magic wands, barrels, stirrers, burettes, etc.
3. Prepare the test samples according to the test requirements, and weigh them in batches to make the samples as uniform as possible.
II. Operational procedures for spreading amount test
1. Place a flat spreading box on a clean and dry test table and install a suitable contour plate.
2. Stir the weighed test sample evenly.
3. Pour the stirred sample into the spreading box, and the width reaches the positioning line of the contour plate.
4. Use a burette to drop the differential reagent and indicator reagent respectively, and stir them evenly with a magic wand after adding them.
5. Add the prepared differential reagent solution to the asphalt emulsion sample, and stir thoroughly with a magic wand after each drop.
6. Stop adding reagents until a certain amount of differential reagent is added and the surface acidity value of the asphalt emulsion sample reaches the initial value of the sample measured by the near-infrared oscilloscope. Record the number of each drop of differential reagent for subsequent result statistics.
7. Perform corresponding result statistics and judge the results according to the standards.

III. Result judgment standards
1. The spreading amount is within the scope of building requirements and meets the design requirements.
2. The spreading amount is outside the scope of building requirements, and the spreading amount needs to be readjusted and retested.
3. If the test results do not meet the standards, the reasons should be analyzed according to the specific situation and the test conditions should be adjusted in time.
IV. Precautions
1. During operation, the test requirements should be followed, standardized operations should be adhered to, and test data should be accurately recorded.
2. When handling test waste liquid, the test site should be kept clean to prevent environmental pollution.
3. After the test, the test equipment and countertops should be cleaned, and the test data and records should be kept well.
In short, when conducting the emulsified asphalt spreading amount test, the test process must be strictly followed to minimize the operating error as much as possible. Carefully record and analyze test results, identify deviations and correct them, and continuously improve the accuracy and reliability of the test.