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Online since: November 2023
Authors: Alena Sicakova, Stefan Kusnir
A substantial number of researchers have reviewed the improvement ways of properties of recycled concrete aggregates.
The properties of concrete with treated RBA will however also be influenced by other parameters, especially by the character of grain sur-face after treatment and by properties of interfacial transition zone.
Sicakova, Methods of strengthening the grains of recycled aggregates, In: IOP Conf.
Akrami, Performance of concrete produced with crushed bricks as the coarse and fine aggregate, In IAEG 2006, The Geological Society of London: London, UK, 2006; p. 10, paper number 616.
Online since: March 2023
Authors: A.I. Bedov, D.A. Sinitsin, Azat I. Gabitov, Aleksander S. Salov
Cement paste volume is to be higher than volume of voids for the large aggregate grains to be absolutely covered by the cement paste, when making the SCC composition enabling flowability increase therewith while reducing particle friction [5].
Experimental Research To analyze possibilities in getting SCC of В25, В30, В35, В40, В45 grades, SUE “BashNIIstroi” Institute laboratory in 2015-2016 made a number of experiments with raw materials of Bashkortostan for SCC proportioning, with the results thereof being used when concreting cast-in-situ structures in several facilities of Ufa.
The following materials were used as the original ones for SCC making: - CEM I 52,5N Portland cement (by branch of “HeidelbergCement RUS”, LLC in Sterlitamak); - 5-10mm cubiform crushed stone from carbonate rocks from Minyar pit; - natural sand with 2.5-2.8 fineness modulus (“coarse” sand group), of dense-graded particle size (all grain sizes) and about 1.5% of silt and clay particles; - filler: MP-1 mineral powder by GOST Р 52129-2003 [6]; - polycarboxylate-based superplasticizer Master Glenium SKY 591 by BASF.
The self-consolidating concrete mixes are likely to be widely applied in the construction of the republic due to increase of number of storeys and complication of cast-in-situ forms.
Online since: April 2016
Authors: Leila Mahdavian, Nasim Sarami
The compressive strength (product Toni tecknik Germany with device number PR41004).
The flexural strength (number of products, Toni tecknik Germany (RB421002).
With the addition of titanium dioxide nanoparticles, properties of samples increase, but the effect of TiO2 nanoparticles in SSCF are more because depends to expansion of the surface and the crystal structure of titanium dioxide nanoparticles and grain size of the lesions.
[19]ISO 8486-1: 1996, Bonded abrasives - Determination and designation of grain size distribution - Part 1: Macrogrits F4 to F220
Online since: August 2006
Authors: Sayuri Matsuoka, Masayuki Yoshiba, Yoshio Harada, Satoru Takahashi, Wataru Kakuta
On the other hand, C2S-CZ system (MSV) is characterized by the TC bearing a great number of the dispersive micro-cracks which should be Table 1 Coating processing and reheat treatment for Mar-M247 (MB) and various TBC systems.
Under the static creep loading, it was confirmed that typical creep rupture is caused of TBC systems according to typical creep failure manner; by the nucleation and coalescence of the grain boundary cracks in the alloy substrate interior by the manner essentially similar to the MB specimen without TBC.
the TC surface of such an interfacial crack by the coalescence with a number of dispersive TC cracks.
Conclusions (1) Under static creep loading, all kinds of TBC systems exhibited the typical creep rupture behavior regardless of the environmental condition, with the manner of the nucleation and coalescence of mainly the grain boundary cracks in the alloy substrate interior.
Online since: July 2015
Authors: Wen Quan Tao, Mazhar Hussain, Shakeel Ahmad
Every cell in the grid system will be assigned a random number (0-1) and the cell whose random number less than will be selected as a core.
(vi) A new random number will be assigned to neighboring cells of each growing pores.
The neighboring cell in direction will become part of macro pore if its random number no greater than.
Considering the computational time and numerical stability, the grid number of the 2D computational domain is set to be.
(3) where is the local non-dimensional relaxation time, which is equal to in solid (grains) phase and in the gas (pore) phase respectively.
Online since: November 2012
Authors: Ana J. López, Emilio Saavedra, Javier Lamas, Maria Paula Fiorucci, Alberto Ramil, Teresa Rivas
Additionally, optimization of the number of nodes to minimize the CPU memory consumption is necessary, owing to the large number required in laser heating simulation.
Dimensions of the sample were 0.75×0.45×0.35 mm3 which is large enough for the temperature to achieve the steady estate, at the values of scan speed applied, and, conversely, lower than the characteristic size of the mineral grains (in the order of 0.5 mm to 2 mm) Time steps used were different during the heating, Dt = 5 ns, and the cooling (Dt depending on the repetition frequency f), owing to the characteristics of the pulsed laser treatment.
FEM simulation features FEM Simulation Features Sample dimensions 0.75×0.45×0.35 [mm3] Mesh sizes 30, 15, 5 and 1[µm] Elements distribution (XYZ): 130×70×15 Total number of elements: 136500 Total number of nodes: 148816 Number of pulses 50 Time step (heating): 25 ns Time step (cooling): Depending on f In order to obtain a first estimative of the heat diffusion towards the bulk, the temperature at the center of the laser spot was obtained.
In the case of a number of pulses, however, a time is required for every point of the sample to achieve the steady state, owing that the temperature in the centre of the spot, and of the sample, has not returned to the initial value before irradiation with subsequent pulse.
Evolution of the maximum temperature reached after a number of pulses a), and temperature variation as a function of time in the centre of the surface, b).
Online since: July 2011
Authors: Shan Yan, Qi Hua Zheng
Table 3.1, The original sections representative deflection value and resilience modulus Pile number Representative deflection (0.01mm) The old road top modulus (MPa) Top surface soil modulus (MPa) 20 cm bottom modulus (MPa) K0+000~k1+000 156.45 98.53 23 48.18 K1+000~k2+000 135.63 120.92 32 61.64 K2+000~k3+000 105.01 156.19 53 87.40 K3+000~K4+000 148.50 110.44 27 54.81 K4+000~K5+000 157.74 103.97 25 51.32 K5+000~K6+000 153.25 94.67 20 44.89 Cool regeneration of the cement stabilized of base course design results The pavement adopt cement stabilized cool regeneration technology.
Construction method used in the process of sand filling real-time detection of compaction, some random shown in table 3.5 situation, accord with compaction degree requirements Table 3.5 Part of random compaction degree Sampling pile number Water content (﹪) Dry density Compaction degree Sampling pile number Water content Dry density Compaction degree K1+220 4.1 2.306 99 K3+920 3.8 2.282 98 K1+560 3.9 2.168 93 K4+680 3.5 2.296 98 K2+150 3.6 2.304 99 K5+260 3.6 2.224 95 K2+900 3.5 2.283 98 K5+570 3.9 2.187 94 K3+305 3.4 2.213 95 K5+960 5.0 2.181 93 The unconfined compressive strength sampling conditions of base course: The construction process of cold regeneration of the base course seven days to cement the unconfined compressive strength with according to the highway engineering inorganic material test procedures in feeding stable T0805-94 methods of random situation. table 3.6 shown.
Table 3.6 7 days the unconfined compressive strength of sampling Construction pile number Number of parts coefficient Cv (%) Average compressive strength(MPa) Represent value Rc-1.282S K0+000~K1+160 6 6.0 3.19 2.95 K3+160~K4+005 6 15.3 3.43 2.76 K4+560~K5+580 9 11.7 3.34 2.84 During the construction of got cold regeneration of cement on-site ,sampling test ,got eight points altogether ,core samples close-grained and hole wall smooth ,core sample length comply with the design requirements.
After all sections regimen use 5.4m Beckman beam deflection situation instrument measuring pavement deflection shown in the table 3.7 Table 3.7 Deflection testing situation Sections pile number Point number average (0.01mm) Three-parameter stress-life (0.01mm) Representative deflection (0.01mm) K0+000~k1+000 100 24.07 18.39 51.66 K1+000~k2+000 100 30.48 10.71 46.55 K2+000~k3+000 100 25.68 12.41 44.29 K3+000~k4+000 100 27.69 11.58 45.06 K4+000~k5+000 100 25.72 9.96 40.66 K5+000~k6+000 100 27.84 9.28 41.76 Conclusion (1)Make full use of the original rood miller disused material plane ,and avoid waste material covering ,having use to protect the ecological environment ,At the same time saving a lot of building materials ,both saved the resources ,and reduce the investment and reduce the cost (2)The old road that add a store the base course is highway maintenance traditional treatment ,this leads to continuously improve road elevation make more and more narrow road width ,and lap with
Online since: October 2011
Authors: Radiman Shahidan, Tabet A. Tamer, Fauziah Abdul Aziz
The mean MFA in Acacia mangium increases rapidly as a function of the number of the year and after the 7th year-old it varies between 6° and 10°.
Figure 2 shows the plot of FWHM against tree age for the various wood samples from pith, bark and pith-bark regions for grain size about 150.0 µm.
Online since: December 2013
Authors: Jin Sheng Lei, Jian Fei Chen, Xue Ting Cao, Qian Feng Wang
It analyzed the relationship between cement slurry viscosity, grouting pressure, the effective grain size, permeability coefficient and the grouting concretion stones strength, in order to provide a reference for practice engineering.
The permeability of the media is mainly controlled by the pore characteristics such as the shape and size of pore, the pore connectivity and the number of pore.
Numbers of data are very limited relative to the complex experimental factors and their relationship.
Where xi is equal to Xi, and xi belongs Rd which i is the number of training ranged from1 to l.
(7) (8) Where l is the number of training set sample, yi is the real value and is the prediction value for No. i. i is real number ranged from 1 to l.
Online since: February 2014
Authors: Jakob Reising, Stefan Schäfer, Scholeh Abedini, Frederic Bäcker
Moving the vertexes of the projected triangles vertically into a grid a limited number of possible modules arises.
This number depends on the defined gradient and the axial dimension of the grid.
It results out of the squared number of included grid elements.
Putting the corner points in a grid one gets a finite number of different triangles.
If it is not allowed to mirror the components the number of necessary tools doubles (see Figure 4).
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