By C. Duquennoi, R. Gallo, A. Thomas (auth.), Prof. Guangxin Li, Prof. Yunmin Chen, Prof. Xiaowu Tang (eds.)
Geosynthetics in Civil and Environmental Engineering provides contributions from the 4th Asian nearby convention on Geosynthetics held in Shanghai, China. The ebook covers a large diversity of subject matters, similar to: basic ideas and homes of geosynthetics, checking out and criteria, reinforcement, soil development and flooring development, clear out and drainage, landfill engineering, geosystem, delivery, geosynthetics-pile help procedure and geocell, hydraulic software, and ecological ideas. distinct case experiences in addition to chosen government-sponsored initiatives corresponding to the 3 Gorges Dam, Qinghai-Tibet Railway, and Changi Land reclamation venture also are mentioned. The e-book might be a useful reference during this field.
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Extra info for Geosynthetics in Civil and Environmental Engineering: Geosynthetics Asia 2008 Proceedings of the 4th Asian Regional Conference on Geosynthetics in Shanghai, China
05 (no temporal trend in tensile test) exist for all exposure conditions. For this analysis, each of the eight treatments pH=4, 7, 8 and 12; T=20°C, 40°C, 60°C and 80°C were treated as a group, and the tensile test data (load at yield and elongation at yield) for each treatment were compared with each other. 05). 05). That is, statistically significant difference exists between the mean load at yield and elongation at yield corresponding to the T=20°C, 40°C, 60°C and 80°C treatments. In Fig. 6, after tensile test the intact (UN-S) HDPE GM has been tensioned, there is no significant damaged at the surface of the intact (UN-S) HDPE GM.
No obvious differences were observed between alkaline (Fig. 5 (b)) and acidic treatments (Fig. 5 (a)) of each kind of HDPE GMs specimens (CMD-S, MD-S, CMD-T and MD-T). This suggests that different types of HDPE GMs have the similar stress crack resistance at the same temperature, in both acidic and alkaline conditions. Stress crack resistance times of the HDPE GMs under different conditions were summarized in Table 3. 1 1 10 100 1000 10000 Failure Time (hour) (a) (b) Fig. 5 Percentage yield stress versus the logarithm of the average failure time of high density polyethylene (HDPE) geomembranes (GMs) (CMD-S: cross machine direction smooth HDPE GM, MD-S: machine direction smooth HDPE GM, CMD-T: cross machine direction textured HDPE GM and MD-T: machine direction textured HDPE GM) at 40°C and 60°C: (a) Acidic solution (pH=4), (b) alkaline solution (pH=8)) 34 Table 3 Stress crack resistance of HDPE GMs (hour) HDPE GMs 40°C 60°C pH=4 pH=8 pH=4 pH=8 210 218 141 146 220 220 151 149 Textured CMD 210 210 140 147 MD 218 215 151 149 Smooth CMD MD CONCLUSION Damaged HDPE GMs showed excellent acidityresistance as intact HDPE GMs.
3 and 4 showed the average elongation at yield of tensile properties of N-S and UN-S HDPE GMs treated in pH solution for 1, 2, 3 and 4 months; (a) pH=4, (b) pH=7, (c) pH=8, (d) pH=12. Treating the specimens for more than two months in the pH solution at 60°C, the elongation at yield values increased slightly but, it increased markedly at 80°C in the similar conditions. This indicates that at higher temperature, HDPE GMs (notched and un-notched) have excellent chemical resistance but, the temperature and the time affect the machine resistance in the same manner as it has been discussed above.
Geosynthetics in Civil and Environmental Engineering: Geosynthetics Asia 2008 Proceedings of the 4th Asian Regional Conference on Geosynthetics in Shanghai, China by C. Duquennoi, R. Gallo, A. Thomas (auth.), Prof. Guangxin Li, Prof. Yunmin Chen, Prof. Xiaowu Tang (eds.)