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.

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.

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.

Preparation of Xonotlite Nano-Fibres Using the Silica Source from Coal Fly Ash and Ca(OH)2

2014 ◽  
Vol 633 ◽  
pp. 7-10 ◽  
Author(s):  
Jing Yang ◽  
Xin Zhang ◽  
Hong Wen Ma ◽  
Ming Wei Wang ◽  
Han Wu
Keyword(s):  
Fly Ash ◽  
Calcium Silicate ◽  
Coal Fly Ash ◽  
High Alumina ◽  
Thermal Synthesis ◽  
Hydrated Calcium Silicate ◽  
Hydrothermal Temperature ◽  
Silica Source ◽  
Naoh Solution ◽  
Hydrated Calcium

Extracting aluminum oxide from high-alumina coal fly ash are significant to make up for the inadequacy of bauxite resource in China. How to comprehensively utilize silica components in coal fly ash is a key technical question in industrialization for extracting of alumina from coal fly ash. Desilication of coal fly ash (CFA) and preparation of xonotlite were studied using the silica-rich solution from the CFA as silica source and calcium oxide as calcium source respectively. The CFA is from a power plant at Shizuishan city in Ningxia, China. Xonotlite was successfully prepared by a series processes including predesilication, hydro-thermal synthesis. The experimental results indicated that SiO2in the coal fly ash changed into NaSiO3after the coal fly ash was treated by desilication using NaOH solution. Hydrated calcium silicate was obtained from the reaction of the solutions produced by desilication and Ca (OH)2at the condition of Ca/Si (mol)=1, T=160°Cand t=1h. Xonotlite was synthesized by the hydrated calcium silicate using the hydrothermal temperature of 260°C for 2 hours. Keywords: Coal Fly Ash, Pre-desilication, alkali Hydrothermally-treated, Xonotlite nanofibres

The Relationship between Furized Gypsum Fly Ash Three Constituent Mixture Subtle Structure and Performance

2011 ◽  
Vol 393-395 ◽  
pp. 1562-1568
Author(s):  
Jia Ying Sun ◽  
Xin Gu
Keyword(s):  
Fly Ash ◽  
Early Stage ◽  
High Strength ◽  
Hydrated Calcium Silicate ◽  
X Ray ◽  
Fly Ash Concrete ◽  
And Performance ◽  
The Relationship ◽  
Alkali Activated ◽  
Hydrated Calcium

The paper aims to study the influence of furized gypsum fly ash three constituent mixture subtle structure to performance by analyzing furized gypsum fly ash three constituent IR, SEM, X-ray phase and DTA. The results show that the reason why furized gypsum fly ash three constituent has the characteristics of high strength in the early stage and good endurance quality is that furized gypsum fly ash concrete has the double actived effect of alkali-activated and sulfate-activated. The development of sclerotium strength mainly relies on ettringite and hydrated calcium silicate gel. During the process of hydration, ettringite and CSH gel hydration increase continuously, hardened structure becomes dense and strength continues to increase.

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