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This paper investigates the effect of using wastes sawdust as a replacement of fine aggregate (sand) on mechanical properties naming compressive, tensile and flexural strengths of ordinary Portland concrete.
In addition to the control mixture (having no sawdust), three more concrete mixtures were prepared to explore the effect of the three different methods of pre-treatment on the mechanical properties of concrete.
Several factors that are related to the wood such as wood species, condition of storage, and part of the wood can affect the compatibility of sawdust-cement.
Table 1 shows the chemical composition and physical properties of the cement used.
Table 1: Chemical and physical properties of cement used Chemical Properties Physical Properties CaO 61.71% Initial Setting Time 117 min.

This made it possible to use rational fillers and special matrix-transformer of external electromagnetic influences as factors for controlling the processes of their structure formation and hardening to obtain materials with the required properties.
Structural characteristics control allows changing their crack resistance, physical-mechanical and deformative properties in a rather large range of values.
This should be reflected in physical-technical properties.
Such influence of control factors of structure formation of polymer-containing compositions should necessarily lead to change physical-technical properties values of end product.
Structure, Self-organization, Properties, TES, Odessa, 2010

The piezoelectric-driven uniaxial stress-strain measurement system was designed to evaluate the mechanical properties of thin films.
The mechanical properties of materials begin to deviate from bulk scaling laws when the characteristic dimensions become small, so that we can no longer apply the bulk properties to microscale systems such as thin films, MEMS, etc.
Thus, measurement technologies for mechanical properties in the microscale range have become critical.
The piezoelectric-driven uniaxial stress-strain measurement system was designed to evaluate mechanical properties.
In this study, we confirmed that the mechanical properties of the MEMS materials are dependent on the device scale and surface flaws on the fabrication processes.

From the aspect of material chemical reaction, documents [5]-[7] describe that the chemical reaction of sulfate ion and concrete under dry-wet cycles lead to degradation of concrete mechanical properties.
Research about degradation of concrete mechanical properties under dry-wet cycles is relatively little.
Wang qin[8] studied influence of dry-wet cycles of sulfate solution on concrete erosion, it concluded that factors affecting concrete erosion rate are specimen response area, concentration of erosion solution, crystallization pressure and solution temperature etc.
In summary, domestic and foreign scholars have carried out experiments to study degradation of concrete mechanical properties after dry-wet cycles.
Conclusions 1) A series of researches about concrete mechanical properties degradation have been carried out at home and abroad.

This paper deals with an overview on the effect of factors on the property in very high cycle fatigue regime.
However, it is reported that some factors, such as load frequency, surface treatment, environments, et al., have the effect on the VHCF properties.
In this paper, some experiments and theoretical analysis results about the effects of various factors on VHCF properties are introduced in recent years, which include the load frequency, surface treatment, environments, strength and microstructure and so on.
Xue, Very high cycle fatigue properties for aluminum alloys.
Gigacycle fatigue in mechanical practice.

The matrix and fibers have significantly different properties.
It is expected that lasers as a thermal acting tool may damage the CFRP, resulting to reduce strength properties.
For laser cuttings, the parameter setting will certainly affect the cut quality, and therefore will also affect the strength of CFRP specimens.
Effect of Heat-Affected Zone on the static tensile strength.
As the result, it can be assumed the less independent of the laser source properties such as wavelength.

The impacts of mechanical parameters in DEM model on the numerical results were analyzed.
The initial porosity, which directly determines the initial density of the sample, will affect the mechanical properties of the sample.
The impacts of mechanical parameters in DEM model on the numerical results were analyzed.
The parameters of the sand samples are shown in Table 2 0.165 Time step/´104 0.5 1.5 3.5 2.5 Porosity 0.185 0.205 0.195 0.175 (a) (b) Fig. 3 Hierarchical compaction method generates sand samples and porosity changes Table. 2 Gravity descent methods to generate the parameter of the sand samples /m /m /m hf /m /kg/m3 kn /N/m Ks /N/m kw /N/m N0 0.12´0.06 0.001 0.00075 1 2630 5´108 5´108 5´107 0.5 3000 Analysis of influencing factors The discrete element method to simulate the actual sample, the mechanical properties of the soil particles, in the choice of constitutive model parameters we used to be our numerical simulation influential. we mainly change the parameters to prepare sand samples, and study the influence parameters have on the process of generating sand samples.
Different parameters will affect the porosity of the sand samples, and porosity determines the initial sample density, and will affect the mechanical properties of the sample as a results.

Influence of replacement ratio and water-cement ratio on the recycled concrete mechanical properties were analyzed by testing the compressive strength and tensile strength of the recycled concrete.
Results show that the mechanical properties of recycled concrete, compared with common concrete, can meet the requirements of the project.
The study of the physical properties of recycled concrete carried out in recent years, but there is little research on the structure properties and components with recycled arrgegate.
In this paper, splitting tensile strength and compressive strength of recycled concrete were mensurated , influence of water-cement ratio, recycled aggregate replacement ratio and other factors were analyzed as well.
Cement and Concrete Research, 2005, 35: 1187-1194 [4] Standard for test method of mechanical properties on ordinary concrete (China Architecture & Building Press, China 2002)（in Chinese） [5] Standard for evaluation of concrete compressive strength(China Architecture & Building Press, China 2010)（in Chinese） [6] Li J.

PP has a semi-crystalline structure which can affect the properties such as mechanical behavior, thermal properties, and chemical resistance [3], [4].
With the high crystallinity of the sorghum fiber, the mechanical properties of the added PP are expected to enhance the mechanical properties of the PP material.
Mechanical Properties.
Increased crystallization of the modified fiber is expected to increase the stiffness and strength of the PP and MFC mixture, implying that its mechanical properties will improve.
Luna, “Nutritional and Functional Properties of Sorghum (Sorghum bicolor (L.)

Other parameters do not have significant influence on the physical mechanical properties of the plate, and can be set as fixed factors according to experience.
The following focus on analyzing physical mechanical properties of straw board made of shavings of form 2. 1.4 Experimental process of corn straw board.
There are many factors affecting the performance of straw board, such as straw board density , adhesive consumption , pressing temperature , pressing pressure ( preload pressure ) , pressing time ( pre-press time ) , shape and material moisture content of raw material straw shavings, etc.
According to experience, we choose main process design parameters, including density, adhesive consumption and pressing temperature as variable factors, take other parameters as fixed factors, and carry out orthogonal experiment to explore the optimal process parameters.
When testing physical mechanical properties of straw board, we take the reference of GB/T4897-92 of particle board.