Dehydration/recrystallization mechanisms, energetics, and kinetics of hydrated calcium silicate minerals: an in situ TGA/DSC and synchrotron radiation SAXS/WAXS study

2000 ◽  
Vol 167 (1-2) ◽  
pp. 141-159 ◽  
Author(s):  
S Shaw ◽  
C.M.B Henderson ◽  
B.U Komanschek
Keyword(s):  
Synchrotron Radiation ◽  
Calcium Silicate ◽  
Hydrated Calcium Silicate ◽  
Silicate Minerals ◽  
Kinetics Of ◽  
Hydrated Calcium

Characteristics of Hydrated Calcium Silicate and Paper Filler

2013 ◽  
Vol 395-396 ◽  
pp. 577-581
Author(s):  
Quan Xiao Liu ◽  
Yan Na Yin ◽  
Wen Cai Xu
Keyword(s):  
Tensile Strength ◽  
Calcium Silicate ◽  
Crystalline State ◽  
X Ray Diffraction ◽  
Hydrated Calcium Silicate ◽  
X Ray ◽  
Color Density ◽  
Paper Filler ◽  
Hydrated Calcium ◽  
Tearing Strength

The X-ray diffraction of hydrated calcium silicate is analyzed and is applied in papermaking. It shows that hydrated calcium silicate have certain crystalline state. The tensile strength, tearing strength and folding strength of paper decrease in different degree with the increase of dosage of hydrated calcium silicate while the whiteness and the printing color density of paper improve. T tensile strength and folding strength of paper decrease in varying degrees with the increase of dosage of PAM while the tearing strength of paper and the whiteness improve. And the printing color density of paper is the same.

The identity of jurupaite and xonotlite

1954 ◽  
Vol 30 (224) ◽  
pp. 338-341 ◽  
Author(s):  
H. F. W. Taylor
Keyword(s):  
Calcium Silicate ◽  
Hydrated Calcium Silicate ◽  
Brown Discoloration ◽  
The One ◽  
Hydrated Calcium

Jurupaite was discovered at Crestmore, California, by A. S. Eakle in 1921. The mineral was found in a quarry which was rapidly being enlarged, and Eakle stated that it was probably represented only by the one specimen which he had collected. He showed that it was a hydrated calcium silicate containing magnesia, with the composition 2(Ca,Mg)O. 2SiO2. H2O, the ratio of lime to magnesia being approximately 7 : 1.This specimen passed into the keeping of Professor A. Pabst, who kindly made a portion available to the writer. He confirmed that it was unlikely that any other specimen existed. The jurupaite consisted of rosettes of white needles or fibres, about a centimetre in diameter. A brown discoloration was observed on the exposed outer surfaces of the specimen, but not on freshly cut surfaces. Calcite was present in contact with the jurupaite.

Research and Application on Magnesium Slag

2011 ◽  
Vol 280 ◽  
pp. 208-211 ◽  
Author(s):  
Si Yu Wang ◽  
Li Guang Xiao ◽  
Qiang Zhou ◽  
Kai Xu ◽  
Bao Li Chen ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Cementitious Material ◽  
Good Combination ◽  
Phase Changes ◽  
Differential Analysis ◽  
Ideal Strength ◽  
Hydration Products ◽  
Hydrated Calcium Silicate ◽  
Hydrated Calcium ◽  
The Ideal

The content of water glass in accordance with the size of range is a major factor in magnesium slag strength. The microstructure of the block of orthogonal testing three shows network-like, acicular, cotton wool attached to each other, the main hydration products are calcium silicate hydrate, needle-like ettringite and CSH gel, just the good combination among the hydration products the cementitious material get the ideal strength value. From the view of differential analysis curve, Ca (OH) 2 decomposed when the temperature reaches 500 °C -540 °C, Ca (OH) 2 generated by the calcium component within the cementitious material reaction with alkali, and the Ca (OH) 2 will participate in the reaction of hydrated calcium silicate gel, and enhance strength of the test block. From the TG thermal analysis we can see that there is no water loss in the process, the performance of ofmineral phase changes and thermal stability are great.

Thermal Stability of Retained Austenite in Low Alloyed TRIP-Steel Determined by High Energy Synchrotron Radiation

2013 ◽  
Vol 772 ◽  
pp. 129-133
Author(s):  
Stefan Brauser ◽  
Arne Kromm ◽  
Eitan Dabah ◽  
Thomas Kannengiesser ◽  
Michael Rethmeier
Keyword(s):  
Synchrotron Radiation ◽  
High Energy ◽  
Heating Process ◽  
Austenitic Phase ◽  
Trip Steels ◽  
The Stability ◽  
In Situ Diffraction ◽  
Kinetics Of ◽  
Thermal Stability Of

TRIP-steels offer a good combination between strength and ductility. Therefore TRIP-steels are widely used in the automobile industries. The aim of this work is to study the stability of involved phases during heating and to identify the kinetics of the occuring phase transformations. For that purpose, in-situ diffraction measurements, using high energy synchrotron radiation were conducted. The analysis revealed the decomposition of the metastable austenitic phase into carbide and ferrite along the heating process and the regeneration of the austenite by further heating of the sample.

scholarly journals Mechanism and Effect of Activating Agent on Mechanical Performance of Steel Slag Composite Materials

2015 ◽  
Vol 9 (1) ◽  
pp. 135-138
Author(s):  
Tian Xiushu ◽  
Han Yufang ◽  
Hou Weifang
Keyword(s):  
Composite Materials ◽  
Calcium Hydroxide ◽  
Calcium Silicate ◽  
Mechanical Performance ◽  
Steel Slag ◽  
Hydration Products ◽  
Hydrated Calcium Silicate ◽  
Activating Agent ◽  
Xrd Patterns ◽  
Hydrated Calcium

This study investigates the effect of three kinds of activating agent on the mechanical performance of steel slag composite materials. Hydration products of the pastes at different ages are investigated by XRD. The results show that compared with the calcium hydroxide, gypsum and sodium sulfate can excite the activation of steel slag more effectively. When amount of gypsum is 1.5%, the 3d strength increases to 1.2MPa, 7d strength increases to 3.3MPa, 28d strength increases to 5.0MPa. Ca2+ and SO42- are provided by gypsum, SiO2, Fe2O3 and Al2O3 in steel slag act with Ca(OH)2, hydration products such as hydrated calcium silicate, are generated in the paste. Enhancement of early strength may be attributed to rapidly consumption of Al2O3 in steel slag and Ca(OH)2. When amount of Na2SO4 is 1.5%, the 3d strength increases to 5.1MPa, 7d strength increases to 6.5MPa, 28d strength increases to 15.5MPa. XRD patterns show that the main products are consist of hydrated calcium silicate, Aft and calcium hydroxide. These products are bonded together, fill the void of paste, so the density increased, and higher strength are obtained.

Truscottite

1954 ◽  
Vol 30 (226) ◽  
pp. 450-457 ◽  
Author(s):  
A. L. Mackay ◽  
H. F. W. Taylor
Keyword(s):  
Optical Properties ◽  
Water Content ◽  
Calcium Silicate ◽  
General Character ◽  
Hydrated Calcium Silicate ◽  
X Ray ◽  
Hydrated Calcium

The mineral truscottite was discovered at the Lebong Donok mine, Benkulen, Sumatra, by Hövig in 1914. He considered it to be a hydrated calcium silicate of composition CaO.2SiO2.1/2H2O. Later work by Grutterink suggested a different formula, 2(Ca,Mg)O.3SiO2.2H2O, the water content being reduced to 1-3 molecules after drying at 120°. Grutterink noted that the composition, general character, and optical properties indicated a similarity to gyrolite. Flint, McMurdie, and Wells concluded from X-ray powder photographs that the two species were identical, although they detected quartz as an impurity in the truscottite examined. All known specimens of truscottite come from the original locality, and no further investigations have been reported.

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