Search results

Sample Description Reinforcement Yes/No (type) A Construction concrete, class C 35/45 No B Construction concrete, class C 60/75 No C Self-compacting concrete, class C 50/60 No D Reinforced construction concrete, class C 50/60 Yes (Steel fibres, wt. 2.5%) E Reinforced concrete, class C 60/75 Yes (Steel fibres, wt. 2.5%) F Fine-grained high-grade concrete Yes (Glass fibres, wt. 3%) G High performance concrete Yes (Steel fibres, wt. 7%) H Ultra high performance concrete Yes (Steel fibres, wt. 5%) Mechanical properties (compressive strength, bending strength, fracture toughness and density) were measured after ageing of 28 days.
The ballistic performance is evaluated according to number of panels needed to withstand defined ballistic threat in multi-hit mode (triangle - three hits with 100 mm distance to each other).
Because of the experiment setup the results can be expressed only in number of panels samples needed to defeat the ballistic threat.
Mixture Reinforcement Fibres Type / (wt. %) Compressive strength [MPa] Bending strength [MPa] Density [kg.m-3] Fracture toughness [MPa.m1/2] Relative price [-] Number of panels to defeat ballistic threat A No 45.5 4.1 2290 1.3 1 4 B No 75.0 5.1 2340 1.1 1.1 4 C No 60.1 5.1 2380 1.2 1.3 4 D Steel / 2.5% 62.0 10.6 2310 15.5 2 3 E Steel / 2.5% 80.5 11.6 2350 13.1 2.2 3 F Glass / 3% 84.5 19.1 2150 - 3.5 3 G Steel / 7% 100.5 20.1 2520 12.8 3.5 3 H Steel / 5% 145.1 10.6 2710 5.9 5 3 Fig. 2 Sample C after multi-hit.

Component Time of grinding x50 [μm] x90 [μm] CEM I 52,5 N 0 min 8,71 28,68 CEM I 42,5 R-SC 0 min 11,51 38,34 CEM I 42,5 R-SC 10 min 7,8 33,17 CEM I 42,5 R-SC 30 min 5,33 26,81 CEM I 42,5 R-SC 60 min 3,27 24,36 FA 0 min 10,54 34,52 FA 10 min 3,94 22,1 FA 30 min 2,1 9,05 FA 60 min 1,63 6,66 FFA 0 min 1,63 6,18 FFA 10 min 1,42 6,52 FFA 30 min 1,40 4,25 FFA 60 min 1,28 5,75 GBFS 0 min 11,2  65,41 GBFS 10 min 6,21 28,63 GBFS 30 min 4,02 12,4 GBFS 60 min 3,71 11,98 * The numbers in this parameter mean how many percents of the number of particles are below given size (90 and 50 %).
As the mixing took place outside the calorimeter the first peak caused mainly by the hydration of C3A phase and by the reactions on the grain surface was not recorded entirely.
REG LO1211 with financial support from National Program for Sustainability I (Ministry of Education Youth and Sports) and Czech Scientific Foundation number: GA13-41018S.

The servomotor received a pulse/direction signal from the CNC interpolation device, the pulse number expressing displacement command, and pulse frequency showing speed command.
Fig. 2 Schematic diagrams of In-Process Grinding Fig. 3 Chucking jig of aspheric lens and workpiece (a) ∆X<0 (b) ∆X=0 (c) ∆X>0 Fig. 4 Effects of X axis centering error Effects of feedrate on profile accuracy The rough grinding of aspheric lens was performed with four lenses, grinding wheel of 10µm grain size, metal bond diamond wheel, depth of cut 2µm, work speed of 300rpm and grinding wheel speed of 80000rpm.
As comparing with the profile error without compensation, there was a significant increase in the number of positions at which the errors were eliminated.
As comparing with the profile error without compensation, there was a significant increase in the number of positions at which the errors were eliminated.

The number reflects the coating thickness.
The composite with untreated PALF displays a large number of long pull-out fibers [12, 15].
The composites with treated PALF display a much smaller number of pull-out fibers and the pulled-out ends are much shorter.
Formela, Preparation and characterization of natural rubber composites highly filled with brewers' spent grain/ground tire rubber hybrid reinforcement, Composites Part B: Engineering 145 (2018) 182-188

This map is of great interest because it can be used as a tool to predict “as-quenched” properties of titanium alloys, independently from the number of alloying elements.
Hypothesis is made that after the nucleation of twinning embryos, the hardening is caused by the increase of the number of twins per unit volume and the thickening of these existing twins since the mismatch of the coherent twin boundary is linearly proportional to the thickness of the twins.
Additionally, the increase in the number of twins probably results in a decrease of the effective grain size and therefore increases the applied stress necessary to initiate new twins.

Highly compacted soil beds The following is stated in a number of scientific studies: as long as the stress-strain ratio of compound tension layers in non-uniform (two-layers) foundations increases due to interactions the thickness should decrease as well.
Sketch drawings of the areas are given in the Figure 2, where the tests № 2-4 have been made with the use of gravel with pebbles, the test № 5 – gravel-pebble with sand, the test № 6 – average-grained sand, and the test №7 – heavy clay loam.
A number of scientific studies deal with the research on reinforcement members having impacts on strain and bearing capacity values of the soils [13-18].
Though the number of experimental and theoretical research studies are still limited.

The underlying reasons for these phenomena lie in that under high strain rate loading there is a great compression of grains in axial orientation and the head of TA jacket will be formed as mushroom-head, shown as Figure 6.
(a) d=0.25mm (b) d=0.5mm (c) d=1mm Fig.8 Lateral effect of PELE with TFC jacket adopting distinct diameter tungsten fibers During above simulation process, because of the same number and different diameters of tungsten fibers, PELE projectiles have distinct volume fractions of tungsten fibers and unlike density of jacket accordingly.
Fig.9 Axial velocity of PELE debris with Fig.10 Radial velocity of PELE debris with different diameter tungsten fibers different diameter tungsten fibers It can be seen from Figure 9 that provided with same number tungsten fibers, the thicker the tungsten fiber, the bigger the residual axial velocity of PELE with TFC jacket behind target, which means PELE having more adequate penetration ability.
With the same number of tungsten fibers, the thicker the tungsten fiber, the greater the penetration ability and the more difficult to disperse for PELE.

There are 24 sample points altogether, among which 12 sample points located on sluice, numbered X1 to X12 from No.1 sluice to left riverbank, separation distance between sample points is 60 meters. 12 sample points are located on downstream of tail channel, among which 6 are on the surface of riverbed numbered C1 to C6, the other 6 points at the bearing surface of tail channel are numbered W1 to W6.
Tab. 5 Optimization of filter material gradation Filter material Grain composition (%) 20.0mm~10.0mm 10.0mm~5.0mm 5.0mm~2.0mm 2.0mm~0.5mm upper grading envelope curve of filter get rid of less than 0.5mm particles 4.65 17.72 77.63 lower grading envelope curve of filter material get rid of less than 0.5mm particles 2.30 5.22 23.09 69.38 From Fig.8 we can see that after getting rid of less than 0.5mm particlesin lower grading envelope curve of filter material, the grading curve which is greater than 0.5mm is not changed, but less than 0.5mm is missing.

Introduction Carbon number patterns of normal alkanets (n-alkanets), straight chain, have proved of great value in environmental and pale-environmental biomarker-based research and origin information.
Other kind of odd carbon-number dominant distributions of long chain n-alkanets, typically in the range of nC27 to nC31, are characteristic components of the epicuticular leaf waxes of higher plants of high OEP and relative high ratio of Pr/Ph [2].
The black mudstones are uniformly rhythm city depositions in the upper section of E1f2, which is comprised of dark shale’s or marls with well-bedded grain and mudstone or fine sandstones with massive beddings.
Moreover, A strong predominance of even carbon-numbered n-alkanets in the range nC14~nC22 in sediment extracts should be associated with a contribution of organic sediment in hyper saline environments.

In the multi-pass scratching test, the number of friction cycles, N, was varied from 1 to 5.
Fig. 1 also shows that with increasing number of scratching cycles, the role of interfacial friction becomes significant.
But with the increase in the number of cycles, the friction coefficient decreases in the low load regime.
[17] Yifang Cao et al., Nanoindentation Measurements of The Mechanical Properties of Polycrystalline Au and Ag Thin Films on Silicon Substrates: Effects of Grain Size and Film Thickness, J.