Durability of Geotextiles (RILEM Proceedings) by RILEM

By RILEM

In past times decade, using geotextiles has elevated considerably in a variety of civil engineering functions: street building, coastal engineering, stabilization of slopes and keeping constructions, reinforcement of foundations, drainage and so forth. This paintings specializes in the criteria which be certain the extent of long term functionality of those fabrics corresponding to their mechanical and actual homes and physico-chemical getting older techniques. (It comprises contributions to a world seminar held at Saint-Remy-les-Chevreuse, France, in November 1986)

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For all materials and constructions the creep rate increases with temperature. For most materials and loading conditions the creep rate increases with specific load. For all materials creep increases with time, sometimes linearly on a logtime scale, but then the linearity is not per se constant over a large number of decades. (The log-log relation, as formulated by Nutting, in general does not apply to drawn polymers). 3. Influence of the polymer Drawn, melt-spun polymers consist of long chain molecules arranged in crystalline regions alternated with amorphous regions (Figure 1) 27 Figure 2.

30 Suivant le niveau de la contrainte initiale de l’essai de fluage seules les parties I et II de la courbe representative peuvent être décrites. Si la deformation tend vers une limite, le fluage est dit stabilise. D’une façon générale et plus particulièrement dans le cas des géotextiles, la fonction fluage s’exprime par une relation du type: ε=ε0+A f (t) où A est une constante. Suivant les auteurs la fonction f(t) est soit logarithmique (2), soit exponentielle (3). Des essais de fluage peuvent être conduits sous différentes temperatures.

Strain rate is plotted versus total strain, is a valuable technique for establishing the presence of a steady state rate of creep and can thus assist in the avoidance of long-term instability. For such a technique to be effective, however, a sufficiently long period of testing must be carried out for a range of tensile loads. The results shown in Fig. 4 have been re-plotted in Fig. 7 as Sherby-Dorn plots and at the higher testing loads the curves indicate that a steady-state creep rate has been virtually established.

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