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Abstract The effects of natural and artificial weathering on mechanical properties of Chlorinated Polyvinyl Chloride (CPVC) pipe material are investigated.
Furthermore, the presence of oxygen and humidity induces changes in its mechanical properties.
The mechanisms responsible for the degradation of the mechanical and physical properties of CPVC are reported in this study.
Effect of Artificial Weathering on Mechanical Properties Table 2 illustrates the average values of the tensile properties of CPVC pipe material for different accelerated artificial exposure to UV radiation in the conditions specified above.
Alawi, "Weathering Effects on Some Mechanical Properties of Polyvinyl Chloride Pipes", Journal of Test. and Eval., Vol. 18, 45-52, 1990

Both steels exhibited a good combination of mechanical properties (Table 2).
Mechanical Properties of steels.
The study of mechanical properties showed an increase in the UTS of ~150 MPa and YS of ~ 300 MPA.
One of the major factors responsible for the retained austenite stability is the higher carbon content.
Conclusions Both IA and TMP steels after PS/BH treatment demonstrated an improvement in mechanical properties.

Influence of Thermo-mechanical Heat Treatment on the Thermoelectric Properties of Ag added Bi1Sb3Te6 Compounds W.K.
A highly anisotropic hexagonal crystal structure which has weak van der walls bonding along the c-axis is the reason of low mechanical properties - especially the brittleness caused by cleavage fracture.
Therefore, it is need to find the process which can produce fine grained and highly oriented structure without loss of mechanical properties.
Therefore, it is proposed that Ag added Bi1Sb3Te6 thermoelectric materials produced by hot-extrusion may provide improved thermoelectric performance without loss of mechanical properties.
The intensity change of (110) plane which is perpendicular to the basal plane could affect the thermoelectric properties.

Peng Cai et. al. [9] studied the effect of mullite content on the mechanical, thermal and tribological properties of frictional material.
Therefore, understanding the effect of different factors on material properties is critical and could increase the ability to design and control the production process to achieve required property.
Hence, it is extremely useful to study the effect of different variables on tribology, physical and mechanical properties.
Rimdusit, Thermal and mechanical properties enhancement obtained in highly filled alumina-polybenzoxazine composites, Polym Compos 35 (2014) 2269–2279
Wang, Effect of resins on thermal, mechanical and tribological properties of friction materials, Tribology International 87 (2015) 1-10

These studies showed that mechanical properties of composite laminate have a significant influence on the performance of composite reinforcement method.
These changes usually degrade the mechanical properties of the laminate with time.
KI and KII are the mode I and mode II stress intensity factors (SIF) respectively.
Both rc and cθθσ are assumed to be material properties.
The mechanical properties used for aluminum alloy, epoxy adhesive and composite patch in ambient air conditions are listed in Table 1.

The analysis result shows that, the level of deck status may apparently affect the mean value and the MSD(mean square deviation), the differences of vehicle impact factors in case of different assurance rates are large.
Some domestic and foreign scholars carried out researches on this aspect: Huang Dongzhou[1] analyzed the dynamic properties and impact factor of a medium-bearing type of concrete-filled steel tube arch bridge with span not beyond 200m, raised the relevant formulas for simplifying calculation; Sun Chao, Chen Baochun, etc. [2], collected the actually-measured impact factors of many concrete-filled steel tube arch bridge and gave a simplified formula for calculating the impact factor of a routine concrete-filled steel tube arch bridge, found that the actually-measured impact factors of many concrete-filled steel tube arch bridges are basically higher than the values specified in the contemporary specifications; Yan Zhigang, etc. [3], carried out a theoretical and actually-measured analysis for the dynamic impact effect of a medium-bearing concrete-filled steel tube arch bridge, they deemed that the deck roughness is the main exterior cause affecting the impact factor.
As an important factor that affects the vehicle impact effect of a bridge, deck roughness has apparent randomness.
On basis of this, in allusion to the effect of the random properties of the roughness, a statistic analysis was conducted for the impact effect of the loading bridge and some valuable conclusions were given.
Order of mode participating in calculation Vertical Displacement (mm) Fig.3 Effect of mode truncation order on the maximum value of the dynamic deflection at span middle 4 Impact factor statistics analysis in case of random roughness 4.1 Selection on the quantity of roughness swatch in impact factor statistics analysis Deck roughness is an important factor affecting the vehicle load impact factor of bridge, it has apparent randomness.

The mechanical properties were performed at the same apparatus and followed standard of EN 310.
This disparity derived from the difference structure, previous study [5] showed that surface layer, layout of each layer, especially the middle layer and the bonding strength were all affecting mechanical strength.
Combined with TABLEI it can be inferred that water immersion time and temperature, freezing process, drying temperature and time were the main factors influencing the strength.
When exposed to outdoor aging, sunlight was another important factor degrading the panels which showed apparent discoloration, but compared with temperature and water, sunlight affected more on surface layer and little on mechanical properties, so the study ignored the influence of sunlight [10].
Kokta，”The Effect of Aging Conditions on the Mechanical Properties of Wood Fiber-Polystyrene Composites: I.

Performance Analysis of Reinforced Concrete Structures Strengthened with BFRP Zebao Kana , Yanru Lib College of Service, Navel University of Engineering, Tianjin,China akanzebao@163.com, byanru_li@126.com Keywords: BFRP, Strengthen, Reinforced Concrete Structures, Calculation Model, Mechanical Properties Abstract.
Based on those researches, the mechanical properties and calculation models are analyzed.
Introduction With the increase of service life of concrete structure, because of the changes of environment and other factors, many problems of the structures which have been built are appeared, such as aging, damage and the performance of lagging behind.
There are many factors affecting the reinforcement effect, which can be divided into two categories.
At present, the domestic and foreign scholars did lots of experimental researches on the mechanical properties of strength, stiffness and ductility of concrete columns confined by FRP under the simulated seismic loading.

Rheological properties are significantly related to workability of concrete and to requirements of mixing water amount and thus affect the development of strength, durability of concrete and resistance of concrete to extreme conditions and to high temperature.
Introduction Rheological properties of fresh concrete are one of the factors determining its use and depend on a number of variables, such as cement type, dose and type of plasticizing admixtures, type of aggregate, type of ingredients used, environmental temperature and finally delivery time of fresh concrete to the construction site [1], [2].
Their properties are comparable with those of Portland cement.
Besides monitoring the physico-mechanical properties of concrete with Portland-composite cements and Portland-limestone cements their rheological properties must be also verified.
Rheological properties of cement pastes may be influenced by admixtures based on nanotechnology (carbon nanotubes), which affect also other physical and mechanical properties.

Thus, we draw the conclusion thermal refining is an effective way to improve mechanical properties and delayed fracture resistance of high strength construction steel bars.
This paper analyzes the effect of heat treatment on mechanical properties and delayed fracture resistance of steel bars, and according to exiting problem such as poor delayed fracture resistance, mechanical property instability, high yield ratio and so on, some suggestions are put forward, which center on the thought of improving comprehensive properties of construction steel bars.
The quenching temperature affects the austenitizing degree, grain size of austenite and martensite, and the mechanical properties of the samples.
b) a) Fig.3 Effects of heat treatment on mechanical properties of steel bar The variations of strength and elongation of steel bar with tempering temperature are shown in Fig. 3b.
Thus, delayed fracture is one of the largest factors that obstruct the strengthening of steels [4, 5].