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14 series of mortar specimens including control mixture were prepared by replacing Portland cement with 10%, 20%and30%0% by weight of C class fly ash (FA) and 6%, 9%, 12%and15%5% by weight of silica fume (SF).
Binary mixtures of SCMs were prepared by replacing Portland cement with 10%, 20%, and 30% by weight of C class fly ash (FA) and 6%, 10 %, 14 by weight of silica fume (SF).
Plackett-Burman and rotatable central composite design (RCCD) indicated that three variables affected the recoveries of PAHs during the extraction and purification steps: agitation time in the second liquid liquid partition, weight of silica gel in the column, and volume of hexane for PAH elution from the column.
The weight of silica deposited was obtained by the formula: [ ( Weight of the sample after silylation - weight of the sample before silylation ) / weight of the sample before silylation ] × 100 (100
The adsorption isotherms of benzene from aqueous solutions as quantity of benzene adsorbed per unit weight of silica or as quantity of benzene adsorbed per unit of adsorbent surface are given in Fig. 8a and in Fig. 8b, respectively.
It implies the contamination of water by the aquifer and stockpiled rocks and which strongly recommends the weathering and dissolution of granite rocks found in the study area containing 50.17 74.7% by weight of silica and its impacts of the water around the area.
Similar(52)
This revealed absolute quantum yields of 5.6 7.4% for the analyzed species at concentrations of 10 weight% of silica.
Regarding of the weight ratio of silica particle/chitosan (1 2, 1 1 and 2 1; w/w), a series of chitosan membranes were developed.
Particularly, the composite 53 17 with the optimum weight ratio of silica nanoparticles and silica nanoclusters presented the excellent wear behavior with respect to that of the commercial Esthet-X, although the smallest wear volume was achieved by Z350 XT.
Although the average size and the size distribution index of the composite latex particles increased as the weight fraction of silica increased, the stable latex containing the 'guava-like' composite particles was obtained.
Here, the thermal weight loss of silica and silver embedded silica were 8.32% and 8.49%, respectively.
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