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·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 deterioration of buildings and monuments by gypsum is the result of crystallization cycles of this salt Although gypsum can dehydrate to a hemihydrate the mineral bassanite and to an anhydrate the mineral anhydrite this reaction occurs in nature on a geological time scale and therefore it is unlikely to occur when gypsum is found on and in
·Anhydrite 99 wt% Acros Organics was used for the preparation of samples The chemical compositions of ye elimite and anhydrite tested by X ray fluorescence spectrometry are shown in Table 1; the particle size distribution tested by laser diffraction is shown in Fig 1 Deionized water was used for preparing the ye elimite anhydrite paste
·The hydration evolution as well as properties of CSA cement is significantly influenced by curing conditions A significantly later initial and final setting a longer dormant period in the calorimetric curves and much lower strength up to 1 day of CSA cement pastes cured at 5 °C are clearly observed compared to 20 °C [5] Generally curing temperatures do
·Anhydrite is a mineral that belongs to the sulfate mineral group Its name is derived from the Greek words "an" without and "hydros" water indicating its lack of water content Anhydrite is composed of calcium sulfate CaSO4 and is chemically very similar to another well known sulfate mineral gypsum CaSO4·2H2O
·The variation of the amount of gypsum formed and the specific surface area developed during the hydration of anhydrite with hydration time are given in Fig amount of gypsum first increases slowly and then appears at a faster rate Fig 2a The rate of formation of gypsum with hydration time is shown in Fig curve shows that the rate first increases
·In this article the progress of the research on cement hydration mechanisms is critically reviewed starting with the work of Le Chatelier and Michaelis during the late nineteenth century Proposed mechanisms are discussed in the light of experimental data to highlight the role of new or improved analytical techniques The focus of this article lies on the dormant period
·Poiano is the largest karst spring of the Emilia Romagna region northern Italy It drains an aquifer of unique properties composed of anhydrite with halite lenses at depth and gypsum at the surface both with high NaCl content Hydrogeological research has been undertaken using automatically recorded hourly data on temperature electrical conductivity
·The strength hydration products microstructure and heat of early hydration were investigated on alternative hydraulic green cements based on calcium sulphate anhydrite partially blended with
·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
Request PDF On Oct 1 2022 Jiru Wang and others published Effect of Different Lime Anhydrite Ratios on the Hydration Process of Sulfoaluminate Cement Find read and cite all the research you
·The addition of CaCO 3 and CaSO 4 to Portland cement clinker influences the hydration and the strength development An increase of the CaSO 4 content accelerates alite reaction during the first days and results in the formation of more ettringite thus in a higher early compressive strength The late compressive strength is decreased in Portland cements
·A 15 Å layer containing 122 water molecules was then added to this surface to achieve an aqueous environment with a density of 1 g/cm 3 and establish the C 3 A/water interface The vacuum space
·The increase of anhydrite content was beneficial to the formation of ettringite It was concluded that the muscovite possessed pozzolanic activity after mechanical activation and it could react with calcium oxide and natural anhydrite to form hydration products which can react with calcium hydroxide at room temperature after adding water
·Hydration properties were studied by determining free lime non evaporable water contents setting times compressive strength etc X ray diffraction patterns of some of the hydrated samples were
·In the present work gypsum anhydrite transformation in pure water was studied at 90 °C 150 °C and 200 ° results showed that the transformation kinetics was significantly slower at 90 °C such that in the absence of anhydrite seeds gypsum remained stable and no transformation was of 10 wt % of anhydrite seeds accelerated the
·The effect of K 2 SO 4 activator on the hydration of chemical anhydrite obtained from burned FGD gypsum has been studied by different experimental techniques Results obtained show that the degree of hydration increases when the K 2 SO 4 concentrations increase from to wt% Their heat evolution rate and maximum value also increase with
·due to the fact that at temperatures below 70 clusions are generally accepted 1 an increase in pressureC anhydrite does not crystallise in water with measurable rates even in the presence of anhydrite seeds Freyer and Voigt 2003 The following passages summarise the most relevant work in this area Posnjak 1938 Bock 1961 Zen 1965
As the name indicates soluble anhydrite has a comparatively high solubility in water and will rehydrate at a rapid rate The a and forms of soluble an hydrite can be differentiated by their different heats of hydration Conversion of gypsum to anhydrite in aqueous salt solutions 1365 The a form is the more stable hemihydrate
·In anhydrite floor screeds the process of gypsum formation involves the dissolution of anhydrite the formation of dihydrate nuclei and their subsequent growth into larger crystals Chemical activators such as K₂SO₄ increase the rate of hydration by primarily accelerating the nucleation step via continuous syngenite formation in situ In
·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
·Hydration experiments of natural anhydrite in a ball mill with water and activator solutions such as H 2 SO 4 pH 1 5 % MgSO 4 ·7H 2 O and solution of calcium hydroxide as a function of time
