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Online since: January 2018
Authors: Iva Kolářová, Tomáš Opravil, Jiří Másilko, Pavel Šiler, Radoslav Novotný
The biggest problem with cement doped with zinc is the retardation of hydration and decreasing of mechanical properties.
From this evaluation it follows that zinc retardation effect was greatest in a very poorly soluble compound, but solubility is not a major influencing factor because the solubility of Zn(NO3)2 · 6 H2O in water is about half that of ZnCl2.
This membrane consumes Ca2+ ions from the pore solution and thus affects the pH value.
For this concentration the zinc retardation effect was greatest in a very poorly soluble compound, but solubility is not a major influencing factor because the solubility of Zn(NO3)2 · 6 H2O in water is about half that of ZnCl2.
Online since: July 2012
Authors: Omidreza Sadaatian, Norasikin A. Ludin, M. Reza Faraji Zonooz, K. Sopian, Nilofar Asim
Crystallinity: Since the physical and chemical properties of materials depend on the crystalline structure of their elements, determining of crystallinity is important characteristic.
Density: Density could affect the desiccant performance.
Differential scanning calorimetry can be used to measure the number of characteristic properties of a sample.
Specific heat capacity Specific heat capacities are important factors that assist the designers to design reactors and cooling systems.
Ozdemir, Biological, physical and mechanical properties of particleboard manufactured from waste tea leaves, International Biodeterioration & Biodegradation, 41 (1998) 75-84
Online since: November 2013
Authors: Breixo Gómez Meijide, Ana M. Rodríguez Pasandín, Ignacio Pérez Pérez Pérez
Since moisture damage is one of the most important factors that contribute to the premature deterioration of flexible pavements [17], the aim of this investigation is to improve the water resistance of HMA made with RCA.
Arm, Self-cementing properties of crushed demolished concrete in unbound layers: results from triaxial tests and field tests, Waste Management 21 (2001) 235-239
You, The mechanical properties of asphalt mixtures with recycled concrete aggregates, Constr Build Mater 24 (2010) 340-345
Mohajerani, Effects of recycled concrete aggregates on properties of asphalt concrete, ResourConservRecy.
Taibo, Mechanical properties of hot mix asphalt made with recycled aggregates from reclaimed construction and demolition debris, Mater Construcc 57-285 (2007) 17 – 29
Online since: February 2011
Authors: Gang Zheng, Hong Li
The normal stress between wires is one of the main factors of the slipping and stress concentration in the stay-cables.
Otherwise, the effect of frictional stress between steel wires must be taken into consideration during the analysis of stay-cable's bending property.
In this problem, the friction factor can be confirmed by test, so the key procedure is accurately calculating the normal stress between the steel wires when they are subjected to the longitudinal force.
(i) Normal stress caused by the lay angle ((KN/m) Normal stress caused by the PE protection (KN/m) Frictional factor* Maximum static friction (KN/m) 1 378.88 35.578 0.211 87.42 2 802.34 35.578 0.211 176.74 3 1282.26 35.578 0.211 277.97 4 1836.01 35.578 0.211 394.77 5 2490.44 35.578 0.211 532.81 6 3290.31 35.578 0.211 701.52 7 4318.70 35.578 0.211 918.44 8 5758.45 35.578 0.211 1222.12 9 8158.04 35.578 0.211 1728.26 10 15356.81 35.578 0.211 3246.68 * Measured by the friction test Fig.5 The tendency chart of the static friction force between layers 5.
Conclusion Normal stress will be generated due to the spiral angle of wires and pinch-effect of hot-extruding PE wrapping when the stay-cable is under longitudinal force, it will ultimately affect the local cable bending stresses.
Online since: July 2011
Authors: Lin Yuan, Xue Feng Chen, Xi Jun Liu, Jie Zeng Wang, Xue Tao Yuan, Song Lin Chen
It indicates that La2O3 is a suitable additive to MgO-MgAl2O4-ZrO2 brick which not only could stabilize phase transition of dicalcium silicate (C2S) in cement, but also do not impair the high-temperature-properties of spinel.
There are two factors for production and duration of cement clinker crust adhered refractory.
Absence one of these two factors will result in wreck of the crust.
Because high-melting compound La2O3·2ZrO2 has none negative effect on MgO-MgAl2O4 brick’s high temperature properties, furthermore, lanthanum ions act on stabilizing β-C2S phase, MgO-MgAl2O4-ZrO2-La2O3 refractory have excellent high temperature properties and good performance of coating adherence to cement clinker.
Firstly, cement clinker react with refractory and adhere each other to produce cement clinker crust; secondly, clinker crust can existstably by certain substance’s affecting in the refractory.
Online since: August 2014
Authors: Xiao Lin Zhang, Xiao Dong Jia, Ya Lin Lu, Chi Zhang, Dian Wen Liu
There are some factors affecting oxidised copper ores was hability, which is intimately associated with gangue minerals, etc.
Copper mineral ores contained mainly digenite and covellite.Copper ore grade was 1.13%, and combined mutagenesisT.f bacteria with ordinary domestication to improve the leaching rate of copper.Considering the ore particle size was reduced, the metal leaching rate, together with broken, production cost and other factors.
According to oxidizing leaching of ammonium sulfate, Delved into many influencing factors in the system, such as the molar ratio of ammonia and ammonium ion, leaching concentrate, liquid-solid ratio, temperature, etc.
And then determined the best process by the single factor experiments, in which made the leaching rate of copper reach 87.7% markedly.
On account of complex ore properties, high oxidation rate and large amount of slime, it is very difficult to treat by traditional flotation process.
Online since: October 2022
Authors: Shu Hong Fu, Tao Wang, Wan Jun Jin, Zhao Li
The AEREX350 alloy has superior creep resistance and rupture properties similar to the other MP family alloys.
With the increase of hot heading temperature, the heat affected area of bolt head increased gradually, and the grain size also increased.
If the heating length is too long, the heat-affected zone is too long, which leads to recrystallization of the alloy in the heat-affected zone and the loss of cold-working hardening effect.
Influence of Aging Treatment on Microstructure and Properties of Cold-drawn Alloy GH350 [J].
Research on high temperature mechanical property and microstructure of Ti6321 titanium alloy [J].
Online since: May 2013
Authors: R.K. Wanchoo, Hema Setia, Ritu Gupta
Longer the nanoparticles remain in suspension in the base fluid; better thermal properties are expected of nanofluids.
An agglomerated nanofluid would possess properties that are different from their stable counterparts.
It is therefore necessary to study and analyze the influencing factors to the dispersion stability of nanofluids and the parameters that might affect the stability of nanofluids.
Numerous factors that affect the behaviour of nano particles inside the nanofluid may be one of the reasons.
Mohapatra, Particle agglomeration and properties of nanofluids, J.
Online since: August 2014
Authors: Antonios Kladas, Minos E. Beniakar, Panagiotis E. Kakosimos, Athanasios G. Sarigiannidis
The vehicle weight and the wheel radius directly affect the motor specifications regarding speed and torque capability.
The utilized Permanent Magnet (PM) material’s properties and its operational characteristics were also taken into account.
(b) Active length- air-gap diameter relationship and (c) Magnetic material properties The number of poles was dictated by the need for a high speed range operation and the need for relatively low supply frequency in order to minimize iron losses, considering also the higher harmonics in supply voltage and current due to the inverter operation.
The mutation factor was set equal to F=0.85 and the crossover probability was set equal to FCR=0.8.
Its nominal efficiency was estimated, neglecting mechanical losses, over 92%.
Online since: November 2014
Authors: Shao Ping Zhou, Feng Qi Wu, Jun Ling
On the basis, the strength, rigidity and fatigue property of the crane was analyzed.
Fig.1 Independent modeling unit of front beam Fig.2 Three-dimensional model of the crane Finite Element Analysis of Crane Steel Structure.The lifting load and the position of trolley are the main factors of stress variation in quayside container crane.
By contract, measure points with lower stress havehuge margins of error for the sake of deviation of data acquisition system, but it doesn’t affect the total stress distribution.
Under normal condition, safety factor is 1.5.
Through finite element analysis, the weld at the landside portal beam should be the checking point of fatigue property.
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