What is the difference between internal powder and external powder in civil engineering? Can you explain it in detail

The main difference between exterior wall putty powder and interior wall putty powder lies in the different components, which leads to the difference in water resistance and hardness. The inner putty powder is mainly double fly powder (white powder), and the outer putty powder is white cement, so the water resistance and hardness of the outer putty powder are much stronger than that of the inner putty powder.

In terms of thickness (particles), there is not much difference between exterior wall putty powder and interior wall putty powder, so it is difficult to distinguish between naked eyes and touch.

Extended data:

Use of putty powder for exterior wall

1, the base should be solid, clean, roughly flat, without Mingshui, and its strength should be greater than or close to that of putty.

2, strong water absorption at the grass-roots level should be treated with clear water or diluted line interface treatment agent for back cover, and then be bored with child after wetting.

3. The newly plastered cement wall shall be bored with child after the curing period.

4. Stir evenly according to the ratio of putty powder to water = 1: 0.5, and let it stand 10 ~ 20 minutes and stir evenly again before use.

5. Scrape with a steel scraper or spatula according to the routine batch. The scraping times should not be too many, and strive to be uniform and smooth without leaving seam marks.

6. The thickness of batch scraping is 0.8 ~ 1.5 mm, and the dosage is 1 ~ 1.5 kg/㎡, which generally survives twice.