Physico-Chemical Peculiarities of Weighted Thermostable Plugging Materials Hydration

Self Cite

A new competitive class of grouting materials has been created. These lightweight grouting materials (LGM) with a density of 1370–1650 kg/m3 consist of oil-well Portland cement PCTI-100, fine powder of PE grade (a by-product of fireclay production from kaolin), acidic fly ash from state district power plants, and lime dust (a by-product of lime production). The composition of the products formed during LGM hydration was clarified by X-ray phase and differential thermal analysis. The rational optimal ratios of ingredients and temperature regimes for the LGM hardening were determined according to the criteria of cement stone strength.

Section: Methods and Instrumentsmentioning

confidence: 99%

Section: Methods and Instrumentsmentioning

confidence: 99%

See 1 more Smart Citation

Development of Lightweight Grouting Materials Based on By-Products of Ukrainian Industry

Orlovskyy,

Biletskyi,

Malovanyy

2023

Self Cite

“…Several researchers [24][25][26][27][28][29][30][31][32] show that the main factors influencing the phase composition of plugging materials, which set under conditions of wells, are temperature, pressure and time, but the effect of pressure is negligible.…”

Section: Investigation Of the Phase Composition Of Cement Stone Setti...mentioning

confidence: 99%

Optimization of Hydrolysis in Ethanol Production from Bamboo

Kebede¹

2022

This research involved optimizing acid hydrolysis in the development of ethanol, a promising alternative energy source for restricted crude oil, from lignocellulosic materials (bamboo). The conversion of bamboo to ethanol can mainly be accomplished through three process steps: pretreatment of bamboo wood for the removal of lignin and hemicellulose, acid hydrolysis of pretreated bamboo for the conversion of cellulose into sugar reduction (glucose) and fermentation of sugars into ethanol using anaerobic Saccharomyces cerevisiae. The effects of parameters (factors) in the hydrolysis step were investigated and the optimum combination of parameters values (temperature, time and acid concentration) was set by experimentation. Factorial design of three-factors-at-two-level with a replica of two (23 = 8, 8•2 = 16) was applied to the hydrolysis step to investigate the effect of hydrolysis parameters on the response variable (ethanol yield) using Design-Expert® 7 software.

“…Also widely used are the works on the joint stabilization of phosphogypsum with fly ash, lime, metallurgical slag for further use as subgrade, embankment material, and road material. [16][17][18][19] According to laboratory tests, such investigated phosphogypsum-based mixtures proved to be environmentally safe and characterized by improved performance.…”

Section: Introductionmentioning

confidence: 99%

Composite Materials Based on Phosphogypsum for Constructive Layers of Road Pavement

Novytskyi,

Topylko,

Marushchak

et al. 2024

The article contains research materials on solving the problem of utilization of waste phosphogypsum by using it in the layers of the road base. For this purpose, composite mixtures based on raw dump phosphogypsum were prepared. The composition of the composite mixtures was optimized to maximize the phosphogypsum content. The phosphogypsum was stabilized with ground granulated blast furnace slag and Portland cement. Laboratory tests have shown that the phosphogypsum-based composite materials meet the requirements of the National Standard of Ukraine DSTU 9177-3:2022 in terms of uniaxial compressive strength and frost resistance. The newly formed mineral phases during the hydration of composite materials based on phosphogypsum-ground granulated blast furnace slag-Portland cement were described using X-ray diffractometric analysis.