Pumpable hybrid cementitious material

Abstract

A hybrid cementitious material is disclosed which can be used for roof support in underground mines, and includes a first mixture and a second mixture. The first mixture can include a precursor, a superplasticizer and water, the precursor including fly ash, cement kiln dust, and/or ordinary Portland cement; the second mixture can include water, sodium hydroxide, sodium silicate and a biopolymer. The first mixture and second mixture can have sufficiently low viscosity to be pumpable over long distances such that upon arrival at a desired location, the first and second mixtures can be combined to form the cementitious material. The cementitious material when cured combines advantageous properties including: high peak and residual compressive strength, and good stability when exposed to air. Example methods are also provided for preparing the hybrid cementitious material.

Dependencies are inferred from the claim text.