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·In this paper the effect of natural anhydrite on the hydration properties of calcium oxide activated muscovite after mechanical activation was investigated The mechanically activated muscovite was activated by two types of activators calcium oxide and calcium oxide blended with natural anhydrite with contents ranging from 5% 10% and 15%
·The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory Additionally the rehydration mechanism of soluble anhydrite was
·Hydration of anhydrite to gypsum also called gypsification is of interest in several economic fields including mining oil and gas and storage of hydrocarbons hazardous and nuclear waste Mertineit et al 2012; Singh et al 2018; Wang et al 2020 It is also highly relevant in construction as gypsum is a major cement and
The circumstances in which calcium sulfoaluminate CSA cements used are multivariate Considering the curing temperature greatly influence the formation of hydrates the hydration of CSA cement containing increasing amount of anhydrite which cured at different temperature was analyzed by calorimetry XRD and DTA TGA And the setting time and mechanical strength
·This indicated complete hydration of HH after 24 h in agreement with [6] Small peaks of anhydrite and calcite as remnants after the commercial gypsum manufacture are noted after 600 days while quartz SiO 2 was similarly present for the pastes with PFA
·The microscopic analysis of the hydration product morphology shows that the incorporation of anhydrite produces ettringite and other hydration products improving the microstructure of the cement
·PDF Le prsent mmento est un panorama de l activit extractive du gypse et de l anhydrite à l chelle française Il prsente un tat des lieux Find read and cite all the
·The influence of sodium oxalate on anhydrite hydration process and crystal morphology of its dihydrate products was studied by determination of the hydration rate hydration temperature and ion
·Semantic Scholar extracted view of "The ternary system Portland cement calcium sulphoaluminate clinker anhydrite Hydration mechanism and mortar properties" by L Pelletier et al Skip to search form Skip to main content Skip to account menu Semantic Scholar s Logo Search 221 892 235 papers from all fields of science
·Abstract Mineral hydration is an important geological process that influences the rheology and geochemistry of rocks and the fluid budget of the Earth s crust and mantle Constant stress differential compaction CSDC tests dry and wet tests under confining pressure and axial stress tests were conducted for the first time to investigate the influence of
·The effects of varying Li 2 CO 3 additions on the hydration kinetics of a ternary CSA OPC anhydrite system were investigated The presence of Li led to increased ye elimite and C 3 S dissolution as well as accelerated ettringite precipitation Excessive additions however resulted in heavily decreased ye elimite dissolution and hydration kinetics after the initial
·The aim of this study is to identify the benefits of using volume phase characteristics and their combinations in the quantitative assessment of restructuring in the process of hydration and hardening of anhydrite containing binder fluorine anhydrite FLA neutralized in the factory conditions the chemical composition of which is
·In this study a new activator composed of anhydrite and calcium sulfoaluminate cement clinker was proposed to enhance the utilization of BFS in super sulfated cement Tests were conducted on the compressive strength autogenous shrinkage hydration heat pH and conductivity of the composites XRD 29 Si NMR BSE and MIP were employed
·With anhydrite as setting regulator the amorphous AFm retention time is prolonged and the endothermal peaks produced by amorphous AFm during DSC MS measurement correspond to 80 160 and 830 910 °C losing H2O and SO2 respectively {Study of aluminum sulfate and anhydrite on cement hydration process} author={Jianguo Han
·Binders composed of ordinary Portland cement OPC calcium sulphoaluminate clinker CSA and anhydrite C S ¯ were examined in order to study the impact of variations of the OPC CSA C S ¯ ratio on the hydration process and related mortar properties A first sample series had various anhydrite contents and fixed OPC to CSA ratio and a second various OPC
·1 Introduction Calcium sulphate binders CSB based on hemihydrate or anhydrite are attractive due to their low CO 2 emissions and energy requirements The production of hemihydrate from mineral gypsum requires calcination at less than 150 °C while that of Portland cement PC requires 1450 °C the latter also involves decomposition of CaCO 3 as
·The lower peak of the acceleration zone in % indicates a lower hydration reaction of C 3 S less calcium silicate hydrate phase formation and a lower strength gain than SCC 0%
·Micro texture and brine chemical analyses clearly show the swelling due to the hydration of anhydrite into gypsum inside the argillites whereas hydration occurs superficially on the massive anhydrite due to its very low permeability The same has been observed by Gnin et al in the gypsum bassanite transition through the alpha route
·The effects of calcination and modification on the morphology shapes and textures and crystal structure of anhydrite powders were studied The results show that calcination at 100°C causes anhydrite to disintegrate into smaller crystals accompanied by a slight increase in d spacing Without calcination and modification the solidification time and
·DOI / Corpus ID 137298516; Hemihydrate or waste anhydrite in composite binders with blast furnace slag Hydration products microstructures and dimensional stability
False setting this is usually due to the nature of calcium sulfates added specifically too much calcium sulfate hemihydrate bassanite or more commonly plaster Calcium sulfates come in
·The performance of mechanochemical syngenite applied as hydration accelerator for fully formulated anhydrite based self levelling floor screeds was evaluated regarding workability open time
·A hot and arid climate fluctuating relative humidity and an alkaline environment govern the geological evolution and the engineering behaviour of soil deposits in the Arabian Gulf coastal region Azam 2000 Hydration of anhydrite CaSO 4 and dehydration of gypsum CaSO 4 ·2H 2 O lead to alternating volume changes thereby posing serious engineering problems to
·The addition of CaCO 3 and CaSO 4 to Portland cement clinker influences the setting behaviour the progress of hydration and the strength development during hydration If limestone is added in the small quantities limestone has a positive impact on the engineering properties of the cement and concretes [1] The positive impact of limestone on the cement
·In previous studies on anhydrite hydration researchers have found that the strength of the hardened material correlates with the rate of formation of intergrown and connected gypsum crystals [22 50] In anhydrite floor screeds the process of gypsum formation involves the dissolution of anhydrite the formation of dihydrate nuclei and their
·Anhydritic claystones consist of a clay matrix with finely distributed anhydrite Their swelling has led to severe damage and high repair costs in several tunnels Gypsum growth combined with water uptake by the clay minerals is the main cause of the swelling process Identifying the conditions under which gypsum rather than anhydrite represents the stable
·This study assesses the influence of stress on hydration reaction kinetics and mechanics in experiments on anhydrite We show that hydration occurs readily under stress and results in localized hydration along fractures and mechanic weakening New gypsum growth is selective and depends on the stress field and host anhydrite crystal orientation
·In this paper the influence of lime anhydrite L / A ratio on the strength development cement hydration and setting time of calcium sulfoaluminate cement CSA is systemically on Raman spectroscopy and Thermogravimetric and differential thermal analysis TG DTA the results showed that the hydration rate and the amounts and
