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| Design Preparation and Simulation Experiment of Emergency Automatic Plugging Material |
| Received:February 27, 2018 Revised:June 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.06.006 |
| KeyWord:emergent plugging automatic plugging magnesium phosphate cement orthogonal test simulation experiment |
| Author | Institution |
| ZHANG Yi |
Chongqing Construction Residential Engineering Co., Ltd, Chongqing , China |
| OU Zhong-wen |
1.Sichuan University of Science & Engineering, Zigong , China; 2.Army Logistics University of PLA, Chongqing , China |
| ZENG Xian-guang |
Sichuan University of Science & Engineering, Zigong , China |
| LIU Jin-ming |
Army Logistics University of PLA, Chongqing , China |
| DENG Wei |
Army Logistics University of PLA, Chongqing , China |
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| Abstract: |
| Objective To design and prepare a kind of emergency automatic plugging material based on magnesium phosphate cement and carry out indoor simulation experiment. Methods Walnut shell and bentonite were provided as skeleton support of emergency plugging material to adjust the density of the material. Based on this, the single doping experiment was conducted to select anti-disperse component, packing component and expansion component type, and determine the respective dosage range. Then, the polyacrylamide (PAM) dosage, walnut grain size distribution and water absorbing resin (SAP) content were taken as orthogonal experiment design factors. Three factors and three levels of orthogonal experiments were carried out to get emergency automatic plugging material basic formula. Finally, according to different location of leakage, the shape of leak, the size of leakage hole, and the addition of fiber, the leakage plugging system was built. The density of the material was adjusted to achieve automatic plugging by adding drift beads. Through the initial setting time and final setting time test, the displacement method and pH value test, the setting time, density and resistance to dispersion of emergency automatic plugging material were determined to judge the plugging effect according to water seepage. Results After the single doping test selection and the orthogonal experiment adjustment, the basic formula of emergency automatic plugging materials based on magnesium phosphate cement was obtained: 100% Magnesium phosphate cement + 60% Walnut shell particles + 40%-100% Drift beads + 5% Bentonite + 0.6% PAM +4% SAP + 3%- 4% Borax + 0.4% Water reducing agent + 1%-5% Fiber, and water cement ratio was 0.2- 0.25. After improvement of the basic formula, different scales of leakage at the bottom and side can be blocked. Conclusion Fiber can realize the rigid structure in the leakage to achieve blocking of rigid filler and elastic expansion composition. Walnut grain and other filler might be bridges in inside the leaks to provide a layer of seal skeleton. SAP expansion components such as water absorption could fill the leaks tightly. Drift beads could effectively adjust the density of casualty plugging material. |
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