Abstract The use of geopolymers as a full replacement for cement in oil well cementing applications requires the development not only environmentally friendly but also user-friendly cementitious materials. This study aims to investigate early-age mechanical and chemical properties synthesized one-part geopolymers, which are heat-cured rock-based products. These were from granite-based precursor...

the deformation and stiffness characteristics of a cemented gravely sand was investigated using triaxial equipment. the triaxial tests were conducted in both dry and saturated undrained conditions. artificially cemented samples are prepared using gypsum plaster as the cementing agent. the plaster was mixed with the base soil at the weight percentages of 1.5, 3, 4.5 and 6. the applied confining ...

BacKGRoUnD The correct cementing technique for knee replacement involves maintaining the knee in extension for a protracted period of time to compress the cement effectively during polymerisation.1,2 Wound closure can be completed in flexion or extension with no difference in functional outcome3 but is often also completed with the leg maintained in extension due to decreased tissue tension. Wi...

Non-enveloped viruses enclose their genome in capsids built of repetitive polypeptides interlinked with cementing proteins, divalent cations or disulphides. Interactions are broken in a stepwise manner during entry into cells leading to genome uncoating. Receptor or proteases induce conformational changes in case of rhinovirus, poliovirus or adenovirus, and thereby provide direct uncoating cues...

an oil and gas well cementing in gachsaran formation, where sustained annular pressure has been reported in many wells, presents a big challenge in maroon field. the main challenges are preventing gas migration and achieving zonal isolation using a competent cement sealant system which is able to withstand downhole stresses and high temperatures during production cycles. unlike conventional cem...