... and injecting both microbial and plant- based enzymes with urea and calcium solutions to promote precipitation. For comparison, Class H well-, fine-, and Portland Type I- cement specimens were prepared by mixing the cement paste (API 10B) then mixing with sand (ASTM C305). Compression strengths of the plant...

... Characterization structural geology Upstream Oil & Gas Wellbore Design reservoir geomechanics detritus content mudstone grain size composition burst potential loading rockburst elastic strain energy compression strength strength rock burst potential sandstone texture sedimentary rock...

... permeability and adjustable setting time, but they pollute environment and is poisonous. Upstream Oil & Gas rockmass Reservoir Characterization characteristic strength weakness plane roadway compression strength zkd quick-setting application cement slurry chemical material cement clinker...

... lining. Steel and timber sets are much more flexible than concrete. This results from (1) the low compressive strength, typically 250 psi across the grain, of the timber blocking which braces the sets against the rock, and (2) the high elastic flexibility of steel or timber sets. The stiffness...