Search results

Place of origin Type of coal ash Date of sampling Number of samples Počerady Powder FA 2013, 2014 4 Tušimice Powder FA 2013, 2014 3 Tisová K9 Powder FA 2014 2 Tisová K11+K12 Fluid FA 2013, 2014 8 Tisová K11+K12 Fluid FP 2013, 2014 8 Tisová K11+K12 Fluid MIX 1 2013, 2014 5 Tisová K11+K12 Fluid MIX 2 2013, 2014 5 There were researched following properties: · Chemical properties · Specific weight (ČSN 72 2071, ČSN 72 2080, ČSN EN 1097-7) · Loose bulk density and Shake down loose bulk density (ČSN 72 2071, ČSN 72 2080) · Content of free CaO · Granulometry · Volume Stability Chemical Properties and Content of Free CaO Chemical properties.
Type of ash Fluid FA K11 Fluid FP K11 Fluid FA K12 Fluid FP K12 Fluid MIX 2 Fluid MIX 1 d63,8[µm] 36.75 252.59 36.37 191.82 28.90 26.69 d50 [µm] 27.11 208.46 23.05 160.66 15.25 16.14 Powder FA are coarse-grained particulars than fluid ashes.
Fluid MIX 1 and Fluid MIX 2 are more small-grained than powder FA.

Fresh concrete is actually a type of particle assembly composed of water, cement grains, and aggregates grains.
The number of contact points on a unit dimension of the MS plane is expressed as � .

Nanocrystalline materials with grain size of less than 100 nm belong to a new class of materials which have received considerable attention in the scientific and industrial communities during the last decade [2].
A number of corrosion investigations have been reported on many multi-component Zr-, Tibased bulk amorphous alloys and conventional alloys [4-12].
It was also reported that the corrosion resistance decreases with increase in grain size and the presence of multi-phase structure [13,16].

However, the size effect in BaTiO3 ceramics such as MLCCs is a complicated phenomenon because of the coexistence of factors such as internal stress, grain boundaries, etc. in addition to the grain size.
This result suggested the possibility of faster particle growth rate with increasing number of contact points between BaTiO3 nanoparticles. 002 and 200 planes of the BaTiO3 nanoparticles prepared from BTO-A and BTO-B are presented in Fig. 3.

Table 3 Mix proportion of CAM prepared with asphalt emulsion (Kg/m3) Number Particle Size[μm] Cement Sand Water UEA PC SBR latex CSS1 2.2 260 610 75 10 0.9 50 CSS2 3.6 260 610 75 10 0.9 50 CSS3 4.9 260 610 75 10 0.9 50 Fluidity and workable time test Fluidity of CA mortar was indicated by pouring the grout into a funnel and measuring the flowing time until the grout drained away.
This film would bind the hydration product and un-hydrated cement grains to form the structure [8], thus increase the early strength of CAM; however, the asphalt film that formed too early would cover the cement grains thus retarded the cement hydration.

The Lisbon Metropolitan System (Metropolitano de Lisboa), presently comprising stations of different sizes, in 46 locals, inaugurated between 1959 and 2007 [6], constitutes a well-suited set for these studies due to the great number of stations and the diversity of stone materials used.
There are occurrences of surface irregularities in biotite-rich coarse-grained porphyritic granitic rocks applied in pavements (Fig. 3) that seem to specially affect yellowish slabs (yellowish discolouration in these rocks indicates weathering inherited from the quarry that affect physical properties of stones, causing, among other effects, physical weakening and increased porosity).
Fig. 3: Surface irregularity on coarse-grained granitic biotite-rich yellowed stone slabs at Campo Grande station (inaugurated in 1993, [7][8]).

For example, present implementations comprise a large number of security classes (SC).
While in operating systems access classes are assigned to files, database systems can afford a finer-grained classification.
However, the support of fine-grained classifications together with the obvious constraint of maintaining secrecy in the system operation introduces complications.

Results and Discussion 3.1 Crystal Structure and Surface Morphology� XRD was usually used for crystal phase identification and further to estimate the grain size.
After an immersion time of 21 days, the number of these ball-like particles increase, and the surface is totally covered by the newly formed layer.
On the other hand, the nanocrystalline BaTiO3/TiO2 specimens not only provide finer grain size, it also provide denser structure to enhance the corrosion resistance and bioactive

The average grain size of the received sheet is 20~30μm.
The part blank is aluminium alloy 5083 sheet, its thickness is 1mm, its average grain size is 20~30μm.
According to the research results on thickness distribution，void number and void size in free bulging specimen, if the minimum wall thickness of the parts is not less than 0.5mm, then the formed parts can be recognized as qualified.

The HA fibers were approximately 500-600μm in diameter after drying in the oven (based on number average calculations and measured using digital image analysis) and should thinned to 200-300μm in diameter by drawing and other treatments such as texturing and entanglement after extrusion. 2.2 Original scaffold block fabrication.
An important transformation of HA particle aggregates is sintering which can occur among contacting grains at temperatures below the melting point.
The result of sintering was that macroscopic material properties of aggregates such as strength, thermal conductivity, collision behavior, fiber compacting and pore configuration in scaffold, changed due to microscopic solid connections between the previously separate grains.