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Online since: February 2011
Authors: Yi Dong Xu, Jia Ying Sun
In order to further understand the relationship between structure and properties of stabilized lime-fly ash aggregate modified by waste gypsum, we study the relation between paste structure formation and performance of waste gypsum-fly ash-hardened lime.
After testing the optimum water ratio of lime-fly ash, the optimum water ratio was 27%, optimum dry density for 1.79 g/cm3, compaction for 98%, strength testing by cylinder specimens with diameter of 7 (cm), molded by extrusion. 5mm sieve was used to sift massive impurities for fly-ash and lime, avoiding strength development from being affected.
Mechanical properties were tested, then absolute ethyl alcohol was used to suspend hydration and SEM analysis.
The physical properties of lime-fly ash modified by waste gypsum reflected the forming process of the hardening structure in lime-fly ash modified by waste gypsum.
Waste gypsum admixture is one of the most important effect factors of early strength, volume stability for lime-fly ash.
Online since: July 2015
Authors: Brian Yuliarto, Ahmad Nurrudin, Agung Sriwongo, Suyatman Suyatman
The average pore diameter of alumina increases linearly with applied voltage, with proportionality factor lp 0.83 nmV-1.
Besides purity of aluminum, however, the concentration and temperatures of electrolyte, applied voltages, anodizing stages, sample pre- and post heat treatments determined the properties of final products.
Addition of ethylene glycol in electrolyte during fabrication of porous anodic alumina using AA1050 achieved a breakthrough properties of the final products.
The applied voltage affect the dissolution rate of oxide through field-assisted process.
The average pore diameter of alumina increases linearly for applied voltage of 24-30 V, with proportionality factor lp 0.83 nmV-1.
Online since: February 2012
Authors: Hong Bing Huang, Yong Ming Wang, Tong Hua Fan
Material Properties and Meshing.
The material of gear is 40Cr, and its mechanical properties are as follows: elastic modulus E=2.09×1011Pa, Poisson's ratio μ=0.3 and density ρ=7.82×103kg/m3.
This is mainly due to the traditional formula chooses the higher value of the tooth shape coefficient YFa and tooth root stress concentration factor YSa and ignores the effect of the compressive stress.
From the above analysis, we can see the tooth root bending strength fully meets the strength requirement and the surplus amount of strength is large (The gear allowable bending stress is 235MPa, which is multiplied by factor 0.7).
The modulus and the tooth width are two important parameters which affect the strength of gear.
Online since: August 2019
Authors: Francesco Focacci, Jaime Gonzalez-Libreros, Carlo Pellegrino, Christian Carloni, Tommaso D'Antino
Repointing mortars usually have better mechanical properties than the original mortar, but the use of compatible mortars guarantees a better performance of the intervention and durability of the structure [4].
Several researchers pointed out that repointing did not affect axial compressive strength and modulus of elasticity of masonry walls ([4], [6], [8], [10]).
The materials and the confinement procedures were the same, with the exception of the mortar joint mechanical properties (in [18] the compressive and flexural tensile strength were 10.1 MPa and 3.53 MPa, respectively, while in [1] they were 5.60 MPa and 0.22 Mpa, respectively).
Modena, Strengthening of Masonry Structures under Compressive Loads by FRP Strips : Local-Global Mechanical Behaviour, Sci.
Modena, Mechanical behaviour of historic masonry structures strengthened by bed joints structural repointing, Constr.
Online since: February 2024
Authors: Silviana Silviana, Candra Lukmilayani
SiO2 modification produces hydrophobic properties which increase corrosion resistance.
The properties of SiO2 are shown in Table 2 [53].
Hydrophobic properties can increase anti-corrosion ability [50].
The main parameters affecting the reaction are the ratio of water to alkoxide, the type and amount of catalyst, the type of organic group attached to the M atom (metal), and the solvent.
The quality and characteristics of the film produced through the coatings applied using the EPD method are influenced by (1) factors related to suspension and (2) process [19].
Online since: October 2010
Authors: Bin Shi Xu, Bo Zhang, Yi Xu, Bao Sen Zhang
Under this content, MSP has an outstanding friction reduction and self-repairing properties
All that illuminated that MSP in lubricant oil had a good friction reduction property under variable testing loads.
From these, MSP at low load conditions had more excellent tribological properties; while at high load conditions, it can still show good friction reduction and anti-wear.
According to the friction surface temperature theory [10], the main factors affecting the temperature characteristics are the surface pressure “P” and sliding velocity “v”.
Compared with the high load condition,MSP will play better tribological properties at low load condition
Online since: January 2010
Authors: Christophe Sigli, Bernard Bès, Dimitrios Tsivoulas, Phil B. Prangnell
Introduction It has been claimed that combined additions of Zr and Mn dispersoid forming elements in aluminum alloys offer a range of advantages, including improved mechanical properties [1] and better high strain rate superplasticity [2].
Furthermore, Cho and Bès [8] have reported that in a 2139 alloy all the mechanical properties, and especially fracture toughness, diminished compared to when only Mn additions were used.
Other data has shown that the solubility of Mn is not greatly affected by the presence of Zr, with only a marginal decrease reported [12].
Shahani: Aluminium Alloys: Their physical and mechanical properties (ICAA6), Toyohashi, Japan: JILM (1998), p. 87 [18] C.
Second International Conference on Aluminium Alloys-Their Physical and Mechanical Properties, Beijing, China (1990), p. 504
Online since: May 2011
Authors: Lian Jin Tao, Wen Pei Wang, Ji Dong Li, Bo Zhang
Vibration force, impact frequency and site soil are important influence factors on ground vibration attenuation.
The physical and mechanical parameters of different soil are shown in Tab. 1.
Tab.1 Physical and mechanical parameters of calculation mod Soil layer Density (kg/m3) Average depth(m) Moisture content ω% Void Ratioρ cohesion (kPa) Friction Angle (·) Silt 1992 10.27 21.52 0.65 20.6 24.6 Mucky silt clay 1790 17.43 32.92 1.17 18.8 11.2 fine sand 2031 26.91 18.9 0.59 9.7 40.5 powdery clay. 2160 35.2 26.7 1.06 36.9 42.5 Field testing design Test purpose and items.
The vibration attenuates with the increase of the distance from the impacting point .The attenuation of the ground vibration is closely relative to the physical and mechanical properties of the ground media[10].
(4) The attenuation of the ground vibration is closely relative to the physical and mechanical properties of the ground media.
Online since: September 2011
Authors: Yan Yong An, Bao Tian Wang
The specification of the probes is in line with international standards, including conventional probes, pore water pressure probe, and modules of temperature, resistivity, seismic waves and video probes etc, which enabled to obtain rapidly and accurately basic physical properties.
When SCPTU determines shear wave velocity of rock and soil, due to the velocity sensor’s close contact with the soil, it gives a fairly true reflection of soil properties and accurate testing results.
As shear-wave velocity relates to the factors such as type of soil, buried depth, compaction and other factors, which can also be reflected by other indicators of CPT, there is a good practice guide to geotechnical engineering investigation now by establishing the relationship between a shear wave velocity and other conventional indicators of the CPT.
Manual on estimating soil properties for foundation design.
Proceedings of the ASCE specialty conference on In-situ measurement of soil properties ISMOSP Raleigh: (1975)
Online since: June 2019
Authors: Fatima Boukhatem, Abdelhakim Kaci, Abderrahmane Mouffoki, Aicha Bessaim, Abdelouahed Tounsi, Abdelmoumen Anis Bousahla, Houari Heireche, Mohammed Sid Ahmed Houari
The present one has a new displacement field which introduces undetermined integral variables, the shear stress free condition on the top and bottom surfaces of the plate is respected and consequently, it is unnecessary to use shear correction factors.
Introduction Nowadays, the electrical, chemical and mechanical characteristics of the nanostructures, including the nanotubes, nanorods and nanoplates have been received a great attention in nanosciences and nanotechnology because of their superior properties such as the electrical, chemical and mechanical characteristics [1-14], and to their wide applications in micro/nano electro-mechanical systems (MEMS/NEMS) and nano actuators [15, 16].
For this end, the geometric and the material properties of nanoplates are taken as , and .
The material properties are Young's modulus , Poisson's ratio and the mass density [24].
On the dynamics of porous nanotubes with variable material properties and variable thickness.
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