Compression strength degradation

Pultruded GFRP tubes with a 40/34 mm outer/inner diameter and 3 mm thickness was used in this investigation. The specimens are the same as those introduced in Section 5.4.3 for measurements of compressive strength degradation. The fiber mass and volume fractions were 63.8% and 42.5% respectively. The onset of glass-transition temperature, and decomposition temperature, Tj nseu... 

A model for predicting the compressive strength degradation of FRP materials in fire was applied as proposed in Chapter 5. Similarly to the modeling for stiffness degradation, it assumes that an FRP material at a certain temperature can be... 

COMPRESSIVE STRENGTH DEGRADATION IN ZrB2-SiC AND ZrB2-SiC-C ULTRA HIGH TEMPERATURE COMPOSITES... 

Compressive Strength Degradation in ZrB2-SiC and ZrB2-SiC-C Composites... 

Figure 5. Compressive strength degradation after oxidation in atmospheric air at 1400 "C. For ZS samples, 50% strength is lost after 16-24h of exposure time, while for ZSC samples 50% of the strength is lost during the first 0-6h of oxidation.

The progress of the degradation was observed by monitoring the decay of compressive strength (Figures 3-5) and hardness (Figure 6). Particular attention was given to the compressive stresses over the early and middle portion of the stress-strain plateau. At deflections appreciably lower than 0.2 In. and above... 

In practice, it is very important to obtain a high primary hydroxyl content with minimum EO quantity. A high EO content leads to turbid polyether polyols because longer poly[EO] chains are insoluble in liquid polypropylene oxide. The flexible PU foams made with highly ethoxylated polyols have poor humidity/ageing/degradation characteristics and a lower compression strength. 

Fig. 9.9 Agglomerate strength testers top) hydraulic four-column press for the determination of compression strength bottom) from left, rotating tube for measuring degradation at transfer points, drop test arrangement, and drum abrasion tester...

In determining the resistance to degradation of concrete and its role in protecting the embedded steel, not only should the total capillary porosity (i. e. the percentage of volume occupied by capillaries) be considered but also the size and intercormec-tion of capillary pores. Figure 1.6 shows the relation between the transport properties of cement paste (expressed as coefficient of water permeabihty) and the compressive strength as a function of the w/c ratio and degree of hydration [7]. 

---