Cement–epoxy/water interfaces – Energetic, thermodynamic, and kinetic parameters by means of heat-conduction microcalorimetry

Abstract

Hydration phenomena at cement/water interfaces drive the characteristics of oil-well cement slurries. In this study, new epoxy-modified cement slurries were synthesized. The slurries characterization has suggested the presence of low amounts of portlandite in the slurry with the higher content of polymerized epoxy resin. The hydration processes of the cement slurries were studied by heat-conduction microcalorimetry. The energetic and enthalpic hydration data were all exothermic in nature. The cumulative heat release curves have shown the presence of multilinearity of the kinetic processes. The hydration microcalorimetric data were well fitted to the multistep Avrami kinetic model. It was found that the epoxy-modified cement slurries present a good potential to be used in environmental-friendly oil-well operations.

The influence of low amounts on in situ-polymerized bisphenol-diamine net in cement slurries prepared in seawater – structural analysis after long-term contact with in situ-generated mud-acid fracturing fluid

“…The cements slurries were prepared as described earlier in literature [16,17], targeting hardened slurries with water/cement and silica/cement ratios of about 0.50 and 0.35, respectively, and densities of about 1.75 ± 0.12 g/cm 3 [17,18]. Briefly, the main slurry was prepared with 200 g of cement, 70 g of powder silica, 100 mL of seawater, and a mixture of 5:5 (%, in relation to cement mass) of A/F bisphenol solution and ethylenediamine.…”

Interfacial bonding of fine aggregate concrete to low modulus fibers

“…The thermodynamic work of adhesion (W) can be determined by applying the Owens & Wendt equation [16]: The interactions of polymers, adhesives and fibers to cement pastes (without aggregates) were previously investigated [17][18][19][20]. The present work describes the interaction between fibers and the cementitious matrix which contains fine aggregates.…”

Synthesis and characterization of a novel fish scale-immobilized chitosan adsorbent—Preliminary features of dichlorophenol sorption by solution calorimetry

“…The amount of DPI sorbed in each calorimetric experiment was calculated by using the following Eq. (1) [10]:…”

“…A novelty of this work is the use of solution calorimetry to determine both the quantity and the energy of sorption without the need for additional analytical investigation [10,11]. The calorimetric results give information on thermodynamics of the process, energetics and analysis, which are all essential for characterizing the sorption mechanisms [10,11].…”

“…The calorimetric results give information on thermodynamics of the process, energetics and analysis, which are all essential for characterizing the sorption mechanisms [10,11]. However, less attention has been paid to the direct calorimetric investigations of phenols interactions on naturally occurring materials.…”