CEMENTING COMPOSITION IN AN UNDERGROUND FORMATION Russian patent published in 2020 - IPC C09K8/473 C04B28/04 E01C3/04 E02D3/12 

FIELD: construction.

SUBSTANCE: invention relates to cementing in an underground formation, and can also be used in construction of hydraulic structures, building structures and soil modification. Composition for cementing in an underground formation contains, wt%: portland cement without additives type CEM 1 class 42.5 (M500) 75.7–90; mineral additive – powder of dolomite or granite with specific surface area of 3,000–3,500 cm²/g 5–20; superplasticiser S-3 based on the sodium salt of the condensation product of naphthalenesulfonic acid with formaldehyde of 0.3–0.6; guar gum or xanthan gum 0.2–0.5; reagent for gas generation – aluminum powder 0.3–0.7; calcium formate 0.5–2.0; lithium carbonate 0.2–0.5.

EFFECT: obtaining an expanding fast-hardening composition having a controlled coefficient of linear expansion Kp=1_5–3, coefficient of thermal conductivity of not more than λ=0_15–0_2 W/m²*°C and minimum strength on the third day of not less than 0_3 MPa.

1 cl, 2 ex