What Is The Root Cause Of Uneven Color Of Anti-static Terrazzo Board? How To Quantify The Uniformity Of Pigment Mixing?

The root cause of uneven color in anti-static terrazzo board and the quantitative analysis of pigment mixing uniformity are as follows:

1, The root cause of uneven color
Uneven mixing of pigments
Direct cause: Insufficient mixing of pigments with cement and stone particles resulted in local pigment concentrations being too high or too low, leading to the formation of a "big flower face" phenomenon.
Deep factors:
Inaccurate measurement: The amount of pigment added is not proportional to 3% to 6% of the weight of cement, or the same batch of pigment is not used, resulting in color difference.
Mixing process defects: Only using an iron shovel to mix without sieving evenly, or not mixing cement and pigment evenly before adding water, resulting in pigment agglomeration.
Cross contamination: During the construction period, other projects were operated in a cross manner, resulting in colored liquid contamination of the surface layer.
Material and construction issues
Pigment performance: The use of acid pigments that are not alkali resistant or light resistant, or pigments with poor coloring power, can cause fading or discoloration.
Base treatment: The leveling layer is not moistened with water or the interface agent is unevenly applied, which affects the adhesion between the pigment and the base layer.
Construction sequence: Different colored mixtures are applied simultaneously, or dark and light colored mixtures are not constructed in stages, resulting in color infiltration.

2, Quantitative method for uniformity of pigment mixing
Measurement control
Standardization of dosage: The pigment dosage shall be strictly implemented at 3% to 6% of the cement weight, with a maximum not exceeding 10%, and the optimal proportion shall be determined through laboratory testing.
Unified ratio: The same colored surface layer must use pigments from the same manufacturer and batch number to avoid color differences caused by differences in pigment batches.
Quantitative mixing process
Dry mixing and sieving: After mixing cement and pigment evenly, sieve them evenly with a sieve, pack them in bags for later use, and avoid pigment agglomeration.
Water addition time control: After mixing evenly, add water and stone particles to ensure that the pigment is evenly dispersed.
Mixing time and consistency: Use a mixer to mix for no less than 1 minute, with a consistency controlled at around 60mm to ensure the fluidity of the mixture.
Construction process monitoring
Dedicated person in charge: The pigment mixing is operated by a dedicated person, and the amount of pigment and cement used and the mixing time are recorded for each mixing.
Sampling and testing: Before construction, take samples of the mixture to observe whether the color is consistent, or test the pigment dispersibility in the laboratory.
Staged construction: Apply dark colored mixture first, and then apply light colored mixture after reaching strength to avoid color cross contamination.

3, Preventive and Remedial Measures
preventive measures
Strengthen management: During construction, protective materials should be laid on top of the surface layer to prevent pollution.
Optimize the process: Adopt the "two slurry and three grinding" method, which means polishing three times and wiping twice to ensure the compactness of the hole.
Regular maintenance: Clean and wax regularly after construction to improve glossiness and reduce color and visual differences.
repair method

Partial repair: For areas with uneven colors, use the same color pigment and cement to wipe and compact, and then polish after hardening.
Overall rework: If the uneven color is caused by insufficient density of the board or unreasonable aggregate matching, the entire board needs to be removed and re laid.