Design of aromatic polyamides to modify cement performance under triaxial cyclic tests

Contreras, Elizabeth Q.; Althaus, Stacey M.

doi:10.1557/s43579-021-00129-6

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…It was found that a 10% concentration of PC in the mixture was sufficient to improve mechanical properties of PA-12 sintered specimens 49 . Another study showed that the addition of PA enhanced PC’s mechanical properties by significantly reducing mechanical cement fatigue by 93.3% 50 . Yuan et al found that the addition of hot-melt polyamide to hydraulic cement led to excellent crack healing properties and improvement in flexural strength 51 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of polyamide-12/cement nanocomposite and its testing for different dyes removal from aqueous solution: characterization, adsorption, and regeneration studies

Aldahash

Higgins

Siddiqui

et al. 2022

Sci Rep

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Polyamide-12/Portland cement nanocomposite was prepared by using the exfoliated adsorption method. The fabricated nanocomposite was applied first time to remove Congo red (CR), brilliant green (BG), methylene blue (MB), and methyl red (MR) from the synthetic wastewater. The polymer nanocomposite was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, elemental mapping, Brunauer–Emmett–Teller surface area analysis, and X-ray diffraction. The adsorption was rapid and all the studied dyes were absorbed on the surface of the polymer nanocomposite in 90 min. The point of zero charge was found at pH 5 and the factors such as pH, time, and temperature were found to affect the adsorption efficiency. Freundlich isotherm and pseudo-second-order models well-fitted the adsorption isotherm and kinetics data, respectively. The calculated maximum adsorption capacity was 161.63, 148.54, 200.40, and 146.41 mg/g for CR, BG, MB, and MR, respectively. The mode of the adsorption process was endothermic, spontaneous, and physical involving electrostatic attraction. On an industrial scale, the high percentage of desorption and slow decrease in the percentage of adsorption after every five regeneration cycles confirm the potential, practicality, and durability of the nanocomposite as a promising and advanced adsorbent for decolorization of colored wastewater.

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Section: Introductionmentioning

confidence: 99%

Fabrication of polyamide-12/cement nanocomposite and its testing for different dyes removal from aqueous solution: characterization, adsorption, and regeneration studies

Aldahash

Higgins

Siddiqui

et al. 2022

Sci Rep

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show abstract

“…However, all these polymer particles need to be hydrophilically modified, mainly due to the hydrophobic groups on the surface of the polymer particles, which have a lower interfacial adhesion force and lower co-crosslinking level. When applied to water-based mixed systems, this can cause a decrease in the stability, strength, toughness, and other physical properties of the mixed system [ 12 , 13 , 14 , 15 ]. Cheng et al [ 16 ], He et al [ 17 ], and Zhong et al [ 18 ] found that unmodified rubber powder cannot be dispersed when soaked in water, and when added to cement-based composite materials, its compressive strength is low, which can easily lead to a poor stability of the cement paste and the deterioration of its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Polymer Elastic Particles Modified with Nano-Silica on the Mechanical Properties of Oil Well Cement-Based Composite Materials

Wang,

Xu,

Qin

et al. 2023

Polymers

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The integrity of oil well cement sheaths is closely related to the long-term production safety of oil and gas wells. The primary material used to form a cement sheath is brittle. In order to reduce the brittleness of oil well cement and improve its flexibility and resistance to stress damage, nano-silica was used to modify polymer elastic particles, and their properties were analyzed. The influence of the modified polymer particles on the properties of oil well cement-based composite materials was studied, and the microstructure of the polymer particle cement sample was analyzed. The results showed that nano-silica effectively encapsulates polymer particles, improves their hydrophilicity, and achieves a maximum temperature resistance of 415 °C. The effect of the modified polymer particles on the compressive strength of cement sample is reduced. Polymer particles with different dosages can effectively reduce the elastic modulus of cement paste, improve the deformation and elasticity of cement paste, and enhance the toughness of cement paste. Microstructural analysis showed that the polymer particles are embedded in the hydration products, which is the main reason for the improvement in the elasticity of cement paste. At the same time, polymer particle cement slurry can ensure the integrity of the cement sample after it is impacted, which helps to improve the ability of oil well cement-based composite materials to resist stress damage underground.

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Chemical Admixture for Right-Angle Set Wellbore Cements

Contreras

2023

Middle East Oil, Gas and Geosciences Show

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Polyaramid-based chemical admixtures for enhanced gas-tight oil well cements are of interest in the oil and gas industry. Here, a polymer platform is used as the base material for a line of new chemical admixtures in cementing in applications such as small molecule release and particle delivery. Polyaramid-based admixtures provide high-performance for high temperature and high pressure applications in ordinary Portland cement. Experimental results show that a basic cement slurry design responds to the release of admixture by the measure of changes in viscosity and thickening times. Applications in cement design is demonstrated from measurements obtained using oilfield equipment, like the consistometer. Immense efforts towards cement sheath integrity are important for production and safety. Challenges arises during the construction of wells when cement transitions from a slurry into a solid sheath. This transition can span over a significant length of time allowing gases to travel to the surface, causing casing-in-casing (CCA) events and pressure buildup. The ideal scenario is to eliminate the transition time of the slurry by designing cements to set instantaneously into an impermeable sheath. Right-angle set cements are characterized by a 90° set time as measured by a consistometer. The consistency of cement after addition of this new admixture remains at 20 Bc. In all cases, the admixture thereafter remains embedded within set cement and contributes significantly to its mechanical property. Dual performance stems from unique characteristics, such as chemical composition and mechanical integrity of new polymer admixtures. Using these admixtures, gas-tight cement sheaths show enhanced mechanical properties, such as resistance to breakage and fracture propagation, as well.

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Design of aromatic polyamides to modify cement performance under triaxial cyclic tests

Cited by 4 publications

References 31 publications

Fabrication of polyamide-12/cement nanocomposite and its testing for different dyes removal from aqueous solution: characterization, adsorption, and regeneration studies

Fabrication of polyamide-12/cement nanocomposite and its testing for different dyes removal from aqueous solution: characterization, adsorption, and regeneration studies

The Effect of Polymer Elastic Particles Modified with Nano-Silica on the Mechanical Properties of Oil Well Cement-Based Composite Materials

Chemical Admixture for Right-Angle Set Wellbore Cements

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