What is the pH of Gypsum?

We are a company that produces an additive capable to mix in perfec combination gypsum and cement in a proportion of (75% gypsum/25%cement) for the construction industry, producing a rendering mortar whith better qualities than any good mortar in the market (degradationb free, mildew free, corrosion free) as the additive carries a component to avoid all these pathologies.

Question:

when mixing gypsum and cement, is it convenient to raise the ph of the gypsum with another component to improve strenth and its lifetime?

We would be glad to get an answer to: j.anru@emechinternational.com