Abstract
Creep generally showed a great impact on the temperature stress of concrete structure. At present, little research has been done on the creep law of cemented sand and gravel (CSG), and the calculation of creep temperature stress mainly adopts a set of relevant parameters. In this context, experimental compressive creep tests were carried out on the specimens of large-sized cylinders with different cementing agent contents; the creep temperature stress of CSG was also calculated. The results showed that the creep of CSG increased with the increase of cementing agent content, but the specific creep was not obvious. In addition, the creep model of CSG with high accuracy was also obtained, which could provide a basis for the numerical simulation of CSG dam. Furthermore, the results of numerical simulation showed that creep has a great influence on the stress of CSG dam, and the thermal stress energy was less than 37%. At the same time, it was necessary to determine whether temperature control should be considered according to different cementing agent content and external climate conditions, which cannot be generalized.
Highlights
Cemented sand and gravel (CSG) dam is a new type of dam developed on the basis of faced rockfill dam and roller compacted concrete (RCC) dam [1]
CSG dam showed the advantages of convenience and fast construction, being economical, eco-friendly availability, simple temperature control, and good seismic performance [4]. erefore, CSG dams were widely used in various infrastructures, including embankments, reinforcements of small rural hydropower structures, and dam construction
Some studies have been carried out on the creep temperature stress of CSG, the relevant parameters were made just based on the RCC dams or classical formulas
Summary
Cemented sand and gravel (CSG) dam is a new type of dam developed on the basis of faced rockfill dam and roller compacted concrete (RCC) dam [1]. Erefore, the study of creep characteristics of CSG was an important part of its temperature control research. Some studies have been carried out on the creep temperature stress of CSG, the relevant parameters were made just based on the RCC dams or classical formulas. In view of the above problems, creep tests of CSG with different cementing agent contents and 28 days of loading age were carried out in this study. Rough the finite element simulation, the variation law of creep temperature stress for CSG dam was analyzed, and whether temperature control measures should be taken into account in this dam type was discussed In view of the above problems, creep tests of CSG with different cementing agent contents and 28 days of loading age were carried out in this study. e creep and specific creep characteristics of CSG were analyzed, and a creep model suitable for CSG was constructed. rough the finite element simulation, the variation law of creep temperature stress for CSG dam was analyzed, and whether temperature control measures should be taken into account in this dam type was discussed
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