Mechanical properties of different alkali activated slag content for oilwell cement under elevated conditions

Abstract

The increase in awareness towards global warming has prompted the research of alternatives to the conventional ordinary Portland Cement (OPC). The Class G OPC produces huge amounts of carbon dioxide (CO2) gas during its production. The slag based geopolymer cement has been identified as a potential greener alternative. Slag is chosen as the raw material because it contains silica and aluminum which is classified as pozzolan material that can be used to synthesis geopolymer cement. As most of the research done for slag based geopolymer cement is for the construction industry, and therefore, the parameters, ratios and compositions of the cement need to be improved to suit oilwell cementing criteria. The cement was tested for rheology test, fluid loss test and compressive strength test according to API cement testing procedures. The results shown that, 20% volume of water, in 166 Dinesh Kanesan et al.relative to volume of slag and alkali activator produced the optimum density and viscosity result compared to 10% and 30% of water. Meanwhile, Sodium Hydroxide (NaOH) to Sodium Silicate (Na2SiO3) ratio of 1:2.5 gave the ideal result compared to the ratio of 1:0.5, 1:1 and 1:2. Optimum density and viscosity were achieved using NaOH molarity of 12M instead of 10M and 14M. When the slurry with different volume of dispersant were kept for 10 minutes, the thickening time varied. The optimum dispersant volume was 10mL which enabled the slurry to remain in liquid state at the end of the 10 minute test duration.

Performance of Steel Fiber-Reinforced Alkali-Activated Slag-Fly Ash Blended Concrete Incorporating Recycled Concrete Aggregates and Dune Sand

“…The SS solution was Grade N with a density of 1380 kg/m 3 and a chemical composition of 26.3% SiO 2 , 10.3% Na 2 O, and 63.4% H 2 O. Conversely, the SH solution was prepared by dissolving 97%-pure SH flakes in a specific amount of water to obtain a molarity of 14 M and a density of 1506 kg/m 3 . This molarity was chosen based on past research that optimized the reaction efficiency for superior mechanical and durability performance [34,[65][66][67]]. Yet, it should be noted that the SH solution was prepared 24 h prior to casting to allow for the heat associated with the exothermic reaction to dissipate.…”