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安定性是评价水泥性能关键性指标之一,现行试验规范要求水泥安定性检测条件是试件在100℃沸水中连续沸煮3h。但在青藏高原高海拔地区,因大气压力偏低,沸点达不到100℃,导致试验结果产生偏差,使安定性不合格的水泥用于混凝土构造物,给工程带来质量、安全上的隐患。室内和现场试验证明沸煮温度对安定性检测结果有决定性影响,当沸煮温度低于100℃时,雷氏夹膨胀量明显偏低。基于此,研发了一种能够保证安定性试验过程中控制温度在100℃的恒压沸煮设备,完善了在高海拔地区低气压环境条件下水泥安定性检测的试验操作方法。
Stability is one of the key indicators to evaluate the performance of cement. The current test specification requires that cement stability test conditions are that the test sample is continuously boiled in boiling water at 100 ° C for 3h. However, due to the low atmospheric pressure and the boiling point of less than 100 ° C at high altitude in the Qinghai-Tibet Plateau, the test results are biased, and the unqualified cement is used in concrete structures to bring quality and safety hazards to the project . Indoor and field tests show that the boiling temperature has a decisive influence on the stability test results. When the boiling temperature is lower than 100 ℃, the volume of Rayleigh clamp expansion is obviously lower. Based on this, a constant pressure boiling equipment that can control the temperature at 100 ℃ during the stability test was developed, and the test operation method of cement stability testing under low atmospheric pressure in high altitude area was perfected.