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Li W.,Chongqing Three Gorges University | Chen X.,Changjiang River Scientific Research Institute | Chen X.,National Dam Safety Engineering Technology Research Center | Yang H.,Changjiang River Scientific Research Institute | Yang H.,National Dam Safety Engineering Technology Research Center
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2014

The long term water absorption of aggregates including artificial basalt, diorite, limestone and natural granite as well as its influence on deformation of MgO concrete were investigated. The cracking sensitivity of MgO concrete made from different aggregates was measured by advanced temperature and stress equipment (TST machine). Results indicated that obvious increment in water absorption of aggregates from 24h to 180d was observed and self shrinkage and drying shrinkage of concrete was closely related to water absorption of aggregates. The higher the water absorption, the bigger the shrinkage of concrete. Lower cracking temperature of MgO concrete made from basalt and diorite was shown according to the results of TST machine test. It is also shown that enrichment of Ca and Mg on interfacial transition zone of these two concretes was more obvious which implied denser compaction of hydration products favoring crack resistance of concrete. ©, 2014, Tongji University. All right reserved.


Xiong K.,Changjiang Institute of Survey Planning Design and Research | Xiong K.,National Dam Safety Engineering Technology Research Center | Cen W.,Hohai University | Hu Q.,Changjiang Institute of Survey Planning Design and Research | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

Taking ADINA for example, based on external program and native constitutive model secondary development program, it is put forward that the static analysis module, frequency analysis module and seismic analysis module can be united called and data is transferred among these modules to realize the automatic finely calculation for static and seismic analysis of earth rockfill dam. External program is developed only towards the function which can't be realized with ADINA's user-supplied program. A classical calculation example in famous seismic analysis software SHAKE91 is analyzed with the suggested method. The results of comparative analysis and seismic safety study of a high earth rockfill dam show that the method suggested is high efficient, easily programmed and reasonable. This method can be similarly applied to the development of ANSYS, ABAQUS and other finite element softwares to make up for their lack of solving certain programs.


Cheng Y.-H.,Changjiang River Scientific Research Institute | Cheng Y.-H.,National Dam Safety Engineering Technology Research Center | Guo P.-J.,Changjiang River Scientific Research Institute | Guo P.-J.,National Dam Safety Engineering Technology Research Center | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

In order to ensure the anti-floating stability of concrete linings and to prevent water infiltration, the drainage system with the function that meets the requirements of both seepage control and drainage is widely needed in water conservancy projects. One of the choices is the reverse check valve. As a new product, the reverse check valve is not widely used, neither its performance nor method is available, which brings a certain risks to projects. The closed head, open head and drainage quantity are put forward based on the engineering requirements and work principles as the common indices for the reverse check valve. The test equipment and method are developed for the reverse check valve. The long-term performance of the reverse check valve is analyzed. The research findings may provide reference for the tests on the reverse check valve. © 2016, Chinese Society of Civil Engineering. All right reserved.

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