Details about Gypsum
Swelling potential of expansive clayey soils, gypsum depends on reduction of overburden stress, unloading
conditions, however it is very difficult to find significant literature on gypsum as a stabilization agent for expansive
clays. gypsum in a very finely divided powder form can be used as a stabilizing material due to its relatively rate and
reasonable solubility in water.
1. Gypsum blocks can be used in the foundation and pillars of a house. Gypsum blocks are made from gypsum,
a material that is known for its fire resistance and insulation properties. They are lightweight and easy to cut
and shape, making them a versatile building material. However, it is important to note that gypsum blocks
may not be suitable for all types of foundations or in all areas due to local building codes and regulations. It
is recommended to consult with a professional before using gypsum blocks in your foundation or pillars.
2. The effect of gypsum on the improvement of the soil depends on numerous factors, curing period being
particularly important. Appropriate curing time for optimum improvement was determined by obtaining the
swell percent variation with cure time up to certain period.
3. When foundation are laid directly on Gypsum, several solutions can be envisaged. Depend on the presence.
When Gypsum is not located just below the foundation but is situated at a certain depth
Material
To improve the humidity-control performance of traditional building materials and augment their efficacy in
regulating indoor relative humidity, this study incorporated sepiolite powder activated by calcium chloride into
gypsum–silica gel humidity-control material to prepare a new type of gypsum-based humidity-control material.
Through experimental and simulation studies. the following main conclusions were drawn:
(i) Gypsum-based humidity-control material exhibits the ability to absorb moisture in high-humidity
environments and desorb moisture in low-humidity environments. However, the material’s humidity-
control capacity decreases over time during continuous dehumidification or humidification. Therefore,
intermittent dehumidification and humidification are more conducive to maintaining relative humidity
stability for extended periods of time.
(ii) The moisture absorption content of the gypsum-based humidity-control material is minimally influenced
by changes in environmental temperature.
(iii) Addition of calcium-chloride-activated sepiolite powder significantly enhances the adsorption and
desorption abilities of the gypsum–silica gel humidity-control material. At a relative humidity of 97.4%,
the equilibrium moisture content of the gypsum-based humidity-control material can reach a maximum
of 0.225 g/g. It is 1.4 times higher than that of gypsum–silica gel material, and 4.5 times than that of pure
gypsum materials
(iv) during the preparation process of gypsum-based composite materials, the silica gel and activated
sepiolite powder as additives significantly enhance the moisture absorption and desorption properties
of the materials. However, considering that silica gel itself belongs to a “strong absorption and weak
desorption” material, it leads to relatively poor desorption performance of gypsum-based materials.
