Variations in the Chemical Composition, Specific Surface Area, Fineness, and Pozzolanic Activity of a Condensed Silica Fume

1986 ◽  
Vol 8 (1) ◽  
pp. 42 ◽  
Author(s):  
PA Wedding ◽  
B Nebesar ◽  
GG Carette
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Silica Fume ◽  
Specific Surface Area ◽  
Pozzolanic Activity ◽  
Condensed Silica Fume

Elucidating the Origin of the Toxicity of Nano-CeO2 to Chlorella pyrenoidosa：the Role of Specific Surface Area and Chemical Composition

2021 ◽  
Author(s):  
Changjian Xie ◽  
Yuhui Ma ◽  
Peng Zhang ◽  
Junzhe Zhang ◽  
Xiaowei Li ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Aquatic Environment ◽  
Cerium Dioxide ◽  
Environmental Application ◽  
Ecotoxicological Effects

With the increasing environmental application and discharge of nano cerium dioxide (nano-CeO2), it is urgent to fully understand its ecotoxicological effects on the aquatic environment. This study for the first...

Comparative Analysis on Chemical Composition and Charcoal Characterization of Two Miscanthus Species

2011 ◽  
Vol 415-417 ◽  
pp. 1265-1272
Author(s):  
Wen Biao Zhang ◽  
Wen Zhu Li ◽  
Bing Song Zheng
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Water Content ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ph Value ◽  
Perennial Grass ◽  
Water Extract ◽  
Carbonization Temperature ◽  
Hot Water

Miscanthus is a highly productive, rhizomatous, C4 perennial grass that should be considered as an excellent active carbon precursor. This paper compares the charcoal characterization and chemical composition between M. sinensis and M. floridulus. Species differed in water content, hot water extract, 1% NaOH extract, organic solvent extract, cellulose, lignin and ash. Carbonization temperatures have effects on charcoal yields of Miscanthus, which ranged from 23.5% to 48.0% for M. sinensis and 11.3% to 37.2% for M. floridulus. Water content, charcoal density, pH value, and specific surface area of charcoal characterization varied between two species of Miscanthus. The specific surface area increased with the increase of carbonization temperature. The highest specific surface area of M. sinensis and M. floridulus was 351.74 m2g−1and 352.74 m2g−1, respectively, when the carbonization temperature was 800°C.

Study on Comparison among Papermaking Powder Properties

2012 ◽  
Vol 512-515 ◽  
pp. 2434-2438
Author(s):  
Quan Xiao Liu ◽  
Wen Cai Xu
Keyword(s):  
Particle Size ◽  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Preparation Method ◽  
Powder Properties

In this paper the comparison among some papermaking powder properties are studied. It shows that the properties of different powders are different because of different chemical composition and different preparation method and their particle size is different for different purpose such as filler and pigment. The particle size of powder for pigment powder is smaller than that for filler. The specific surface area of papermaking filler is lower than 20m2/g, the absorption value of DBP is about 45cm3/100g, the whiteness is up to 90%, and the particle size is about 3µm. The specific surface area of papermaking pigment is lower than 25m2/g, the absorption value of DBP is from 40 cm3/100g to100cm3/100g, the whiteness of clay is up to 50%, the whiteness of GCC and PCC is up to 90%, and the particle size is lower than 2µm. The specific surface area of silica is up to 100m2/g, the absorption value of DBP is up to 100cm3/100g, the whiteness is up to 97%, and the particle size is around 5µm.

Some Physical, Chemical and Mineralogical Properties of Some Canadian Fly Ashes

1986 ◽  
Vol 86 ◽  
Author(s):  
R. C. Joshi ◽  
B. K. Marsh
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Chemical Properties ◽  
Water Soluble ◽  
Pozzolanic Activity ◽  
Unburned Carbon ◽  
Magnetic Fraction ◽  
Fly Ashes ◽  
Physical And Chemical

ABSTRACTThis paper gives physical and chemical properties of some Canadian fly ashes. Specific surface area, magnetic fraction, water soluble fraction and fraction finer than 45 μm were determined as part of the physical tests. Thermo-gravimetric analyses (TGA) in oxygen and nitrogen were conducted on raw ash samples. The change of pH with time in suspensions of the different ashes in water was also determined. Pozzolanic activity of the ashes with lime for all the ashes was evaluated to measure ash reactivity.The ash activity seems to be related to fineness of the ash measured by the Blaine air permeability method, but not to the fineness measured by nitrogen sorption. Generally the greater the specific surface area, the higher the reactivity of the ash. The correlation was, however, not strong and no other physical or chemical parameter measured in this investigation seems to be related to pozzolanic activity.The results of pH and TGA tests indicated that the ashes differ in many respects from each other. The TGA data suggest that loss on-ignition in many of the ashes is not entirely due to the presence of unburned carbon. Specific surface area determined by various methods seems to provide different values. No characterization parameter was found that was uniquely related to coal type.

scholarly journals Chemical Composition but Not Specific Surface Area Affects Calcium Retention of Nanostructured Calcium Compounds in Growing Rats

2017 ◽  
pp. jn241927
Author(s):  
Lidija Posavec ◽  
Florentine M Hilty ◽  
Jeannine Baumgartner ◽  
Hylton Buntting ◽  
Monika Hilbe ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Calcium Retention ◽  
Growing Rats ◽  
Calcium Compounds

Reactivity of Brick Powder in Lime Mortars

2014 ◽  
Vol 897 ◽  
pp. 135-138 ◽  
Author(s):  
Eva Navrátilová ◽  
Pavla Rovnaníková
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pozzolanic Activity ◽  
Strength Characteristics ◽  
Brick Powder ◽  
Lime Mortars ◽  
Hardened State

The article deals with the assessment of three brick powders. Their properties are evaluated on the basis of their pozzolanic activity, specific surface area and amorphous area. The brick powders were used in amounts of 20 and 40% as a substitute for binder in lime mortars. The influence of the powders on the properties of the modified plasters in a hardened state was evaluated via the determination of strength characteristics. It was found that not all brick powders are suitable for use in modified lime mortars.

scholarly journals The specific surface area and chemical composition of diamond dust near Barrow, Alaska

2011 ◽  
Vol 116 ◽  
Author(s):  
Florent Domine ◽  
Jean-Charles Gallet ◽  
Manuel Barret ◽  
Stéphan Houdier ◽  
Didier Voisin ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area

Study on the Preparing of Nanowhite Carbon Black by Silica Fume

2013 ◽  
Vol 423-426 ◽  
pp. 554-559 ◽  
Author(s):  
Xin Zhi ◽  
Zhan Cheng Guo
Keyword(s):  
Carbon Dioxide ◽  
Carbon Black ◽  
Specific Surface ◽  
Surface Area ◽  
Silica Fume ◽  
Specific Surface Area ◽  
Particle Diameter ◽  
Complete Response ◽  
High Specific Surface Area ◽  
Precipitated Silica

This research through the study on the properties of silicon dust, put forward in combination with lime kiln tail gas recycling carbon dioxide, preparation of precipitated silica (nanoWhite Carbon Black) of high value utilization technology, and studied and summarized process of the dissolution and precipitation by carbon dioxide. The silica fume is in amorphous form, and it has some special powder properties such as ultra fine grain size and high specific surface area and high chemical activity, these provide favorable foundation for low energy consumption process of recycling the powder. In the dissolution stage, the optimization reaction time is about 40 minutes, this time to complete the process of the reaction more than 90%. And the reaction is the fastest in the first 20 minutes, complete response 75% of the reaction. In the stage of carbonization, with increase of the concentration of the precursor, the particle diameter becomes larger, but the specific surface area of the powder will reduce, the porosity and the surface activity of it will reduce corresponding.

scholarly journals Mechanical Activation of Granulated Copper Slag and Its Influence on Hydration Heat and Compressive Strength of Blended Cement

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 772 ◽  
Author(s):  
Yan Feng ◽  
Jakob Kero ◽  
Qixing Yang ◽  
Qiusong Chen ◽  
Fredrik Engström ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Surface Area ◽  
Specific Surface Area ◽  
Milling Time ◽  
Copper Slag ◽  
Pozzolanic Activity ◽  
Hydration Heat ◽  
Strength Development

Mechanical activation of granulated copper slag (GCS) is carried out in the present study for the purposes of enhancing pozzolanic activity for the GCS. A vibration mill mills the GCS for 1, 2, and 3 h to produce samples with specific surface area of 0.67, 1.03 and 1.37 m2/g, respectively. The samples are used to replace 30% cement (PC) to get 3 PC-GCS binders. The hydration heat and compressive strength are measured for the binders and derivative thermogravimetric /thermogravimetric analysis (DTG/TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) are used to characterize the paste samples. It is shown that cumulative heat and compressive strength at different ages of hydration and curing, respectively, are higher for the binders blending the GCS milled for a longer time. The compressive strength after 90 d of curing for the binder with the longest milling time reaches 35.7 MPa, which is higher than the strength of other binders and close to the strength value of 39.3 MPa obtained by the PC pastes. The percentage of fixed lime by the binder pastes at 28 days is correlated with the degree of pozzolanic reaction and strength development. The percentage is higher for the binder blending the GCS with longer milling time and higher specific surface area. The pastes with binders blending the GCS of specific surface area of 0.67 and 1.37 m2/g fix lime of 15.20 and 21.15%, respectively. These results together with results from X-ray diffraction (XRD), FTIR, and SEM investigations demonstrate that the mechanical activation via vibratory milling is an effective method to enhance the pozzolanic activity and the extent for cement substitution by the GCS as a suitable supplementary cementitious material (SCM).

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