Search results

Table1 Physical propeties of materials used Materials Type Symbol Physical propety Bonding materials Portland cement C Density: 3.14 g/cm3 Fly ash F Density: 2.60 g/cm3 Mixture material Special mixture for porous concrete PM Density: 2.78 g/cm3 Fine aggregate Silica sand S Density: 2.62 g/cm3 Coarse aggregage ALC aggregate Gy Grain diameter: 15-20mm, Density: 1.04 g/cm3 , Absorption factor: 86%.
Table 4 Measurement results of unit volumetric mass and continuous void ratio Specimen numbers Unit volumtric mass(g/cm3) Continuous void ratio(%) No.1, No.2 No.3, No.4 No.1, No.2 No.3, No.4 1 0.88 0.94 32.8 26.5 2 0.92 0.93 29.7 26.5 3 0.90 0.93 28.0 27.2 4 0.91 0.92 26.3 27.7 5 0.89 0.92 27.8 28.0 6 0.93 0.93 26.9 27.9 Table 5 Test results of compressive strength Compressive strength (MPa) 7 days 28 days F/(C+F) =0% 1.7 1.9 F/(C+F) =40% 2.0 2.2 Conclusions The porous concrete planting foundation weighs approximately 110 kg/m2, which is far lighter than 180 kg/m2 loading weight.

The reasoning behind this is that in the real contact zone, at a given time, a limited number of grains make contact with the work piece.

In the same design and construction level, the number of overhaul fixed years of the cement is 1 times longer than the asphalt pavement.
Using small construction tools drilling through the cement panel, to fill the cement slurry ash next board, through the high pressure make bottom on the loose, basic level and to place is void place can link close-grained panel in order to achieve the purpose of panel uniform load transfer. 4.3 prevention board edge slab disease measures The cement concrete pavement of plate edge is mainly caused by concrete’s temperature shrinkage deformation and inadequate strength; broken horn mainly because the concrete floor is void and their own flexural strength is low.

Table 1 The orthogonal experiment of chitosan Compile Number A Time /h B Temperature /°C C Acetyl sulfonate /mL Sulfur content / % Color Solubility Molecular weight (´104) 1 1 20 7 9.10 Gray Insoluble 3.92 2 3 25 5 11.33 Khaki Soluble 3.25 3 5 30 3 10.91 Black Dissolve 3.18 4 1 30 3 10.39 Yellow and gray Soluble 3.76 5 3 25 7 10.04 Khaki Soluble 3.42 6 5 20 5 11.47 Yellow and gray Soluble 3.55 7 1 30 5 11.87 Gray Soluble 3.84 8 3 20 3 11.56 Khaki Soluble 3.21 9 5 25 7 9.22 Black Dissolve 2.89 R1 10.500 10.70 9.498 R2 10.997 10.357 11.557 R3 10.533 10.93 10.995 R4 1.492 1.577 3.054 Table 2 The impact of temperature on product sulfur content Temperature /°C 20 25 30 35 Sulfur content /% 10.29 11.56 11.33 9.60 Influence of reaction temperature.
Fig.4 was the SEM image of sulfonated chitosan samples, as can be seen from the graph [14], the nanoparticles with uniform size and better dispersion were approximately spherical, and the particle size was between 70 nm and 100 nm, but there was a slight reunion phenomenon, which was because the preparation of sulfated chitosan as particles was too small, the distance between the particles was very short between the particles, the van der Waals force was much greater than the particle's own gravity, causing the agglomerated particles which produced a certain attraction between grains [15].

Interlayer grain of interface is smaller, it is not stratification and its thickness is variety.
For the sake of reducing prestressing lost, its measure must be operable such as altering pull load or changing space and number of group anchor cables.Tensile load is not influence factor of prestressing loss, but prestressing loss percent is different under the condition of different tensile loads.

The volume fractions and grain sizes of the constituents are given in the table 1.
Conclusion The following conclusions were made based on the SEM, micro hardness and porosity analysis carried out on the samples, · The SEM images indicated the presence of large number of voids in case of composites fabricated by cold pressing and sintering process

A number of methods have been developed to synthesize W nanocrystals, including mechanical milling [6], laser irradiation [7], electron beam-induced deposition [8] and solvothermal methods [9].
The broadened peaks suggest that the WO3 sample obtained consists of small crystal grains.

The number of cycles to failure or separation was taken as fatigue life, Nf.
Moreover, the slip dislocations are easily blocked by grain boundaries or sub-boundaries so as to stagnate and accumulate, which is also a paramount factor resulting in the cyclic strain hardening.

Although the diffusion distance increases with the heat-treatment temperate, the coated diluent on the surface of CeO2 limits the grain growth and 400 500 600 700 2 3 4 5 6 7 8 9 Annealing Temperature ( oC) Lattice Misfit (���� x 10-3 ) 5 10 15 20 25 Size (nm) Fig. 2.
Journal Title and Volume Number (to be inserted by the publisher) maintains the crystallite size to be invariable.

The D50 (grain size corresponding to 50% finer) is 0.33 mm which put the sand in medium sand category.
The reason of splitting the event to two halves is because the equipment to input motions is only capable of inputting limited number of data points at one time.