Abstract
An adiabatic temperature rise test of cemented sand and gravel (CSG) is conducted, a model for temperature rising of CSG is proposed, and its application to temperature stress prediction of CSG dam is presented. Adiabatic temperature rise tests are first conducted to investigate the temperature rise properties of CSG material with different cementing agent contents. The results demonstrate that the hydration reaction time is longer for CSG material with higher cementing agent content, and a linear relationship is presented between cementing agent contents and final value of adiabatic temperature rise. Then, a calculation model considering different cementing agent contents is developed based on the regression analysis of the test data. The proposed model is implanted into the ANSYS software platform for predictions of temperature distributions and stress fields of a typical CSG dam. The results show that the distributions of temperature and temperature stress are similar to those of roller compacted concrete (RCC) dam. Due to the high temperature stress at the long intermittent surface and downstream surface of the dam, the thermal insulation measures on the surface of the dam should be considered in the CSG dam with high cementing agent contents and in the severe cold environment. Therefore, it cannot be generally considered that the temperature control of the CSG dam does not need to be considered, and it should be determined according to the specific working conditions.
Highlights
Combining with the face slab dam and the roller compacted concrete (RCC) gravity dam, cemented sand and gravel (CSG) dam was first proposed by Raphael [1] at the Conference on Rapid Construction of Concrete in 1970s
A finite element method is established to calculate the temperature and stress fields of a typical dam located in China and discuss whether the temperature control measures should be considered for the CSG dam
Compared with the results in [36] and Figure 9, it can be observed that the temperature field distribution of CSG dam with high cementing agent content is similar to that of RCC dams
Summary
Combining with the face slab dam and the roller compacted concrete (RCC) gravity dam, cemented sand and gravel (CSG) dam was first proposed by Raphael [1] at the Conference on Rapid Construction of Concrete in 1970s. The earliest scholars mainly studied the hardfill dam, which is consistent with the composition material of CSG dam He et al [24] and He and Peng [25] conducted temperature field simulation analysis for hardfill, which is a kind of cement content lower than RCC. Adiabatic temperature rise test is carried out for CSG materials with different cementing agent contents, and adiabatic temperature rise model suitable for CSG dam is established. On this basis, a finite element method is established to calculate the temperature and stress fields of a typical dam located in China and discuss whether the temperature control measures should be considered for the CSG dam
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