Strength long-term

But its long-term strength can be a problem. Depending on temperature and environment, the cement may deteriorate suddenly and without warning by "conversion" of... 

Long term strength retention of glass fiber in wet service... 

Good solvent resistance, good long-term strength, good appearance... 

Fig. 5.35 Calcium chloride does not affect the long-term strength development of dense concrete cured under laboratory conditions, or with outside exposure (Blenkinsop). 

To improve the quality of hardened concrete such as increased early and long-term strengths and modulus of elasticity, decrease permeability (and hence inhibit corrosion of embedded steel reinforcement) and absorption, increase abrasion resistance and increase bond with reinforcement. 

It is known (see 91 ) that acoustic cavitation occurs in low-viscous fluids (for example, in water) in a thershold pattern. In 102) the authors carried out an experimental investigations to estimate the thershold of acoustic cavitation in flowable high polymers. Figure 20 gives the results of experiments for three different samples. It can be seen that for one sample the critical (in terms of cavitation occurence) amplitude of acoustic vibrations depends upon time, i.e., in principle, it is of long-term strength... 

Krzhechkovsky et al.132, l72) have calculated the deformability and long term strength of syntactic foams under external hydrostatic pressures. Their deformability e(x) as a function of time is given by ... 

Elastic deformations are found if t = 0. The ultimate long term strength can be obtained from criteria given in 173>. The hydrostatic pressure that the foam can withstand for an infinitely long time, Px is given as... 

Thus the palladium alloy with 53% copper proved to be more permeable than palladium [37]. However, the maximal operating temperature for membranes of this alloy is 623 K. Palladium-ruthenium alloys are more thermostable and may be used up to 823 K. At the increase in ruthenium content from 1 to 9.4 at.%, the hydrogen permeability of the alloys attained a maximum at a ruthenium content of about 4.5%. The long-term strength of this alloy at 823 K after service for lOOOhr was greater by a factor of almost 5 than that of pure palladium [35]. 

The long-term strengths of the CPI in the United States are as follows ... 

As rubber concrete has long-term strength that is distinct from zero and creep damped out at compression, it is necessary to enter element E representing an elastic molecular skeleton of a material into the rheological material circuit (Figure 2.43). 

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