Jointing and surface compound for construction elements, its preparation process and building process of a structure

A building process for a structure, comprising:

• obtaining a composition comprising:
• (a) a drying compound and (b) water;
• eliminating the water from the composition;
• juxtaposing gypsum boards presenting a facer;
• and
• covering a joint between the boards using the drying compound,
• wherein the drying compound comprises from 50 to 85% of a Fluid Gas Desulfurization (FGD) gypsum, in mass percentages based on the total mass of the compound, having the following particle size characteristics:
• (i) a d50 from 36 to 70 μm and (ii) a span (d90-d10)/d50 lower than 2, and the drying compound further comprises 0.5 to 20% by weight based on the total mass of the compound, of an organic binder selected from the group consisting of polyvinylic alcohol homopolymers, polyvinyl acetate homopolymers (plasticized or non plasticized), ethylene/vinyl acetate (EVA plasticized or non plasticized) copolymers, ethylene/vinyl versatate copolymers, vinyl acetate/vinyl versatate copolymers, polyacrylics, vinyl acetate/acrylics copolymers, styrenic/acrylic copolymers, styrene/butadiene copolymers, vinyl acetate/vinyl versatate/vinyl maleate terpolymers, vinyl acetate/vinyl versatate/acrylics terpolymers, acrylic terpolymers and mixtures thereof;
• and
• wherein the drying compound has a density of from 1 to 1.8, a Brookfield viscosity of from 200,000 to 800,000 cps, and a pH of from 8 to 9.5.