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A), and Phase Equilibrium
Published in Kathleen E. Murphy, Thermodynamics Problem Solving in Physical Chemistry, 2020
4.19 A newer cooking method involves using “instant pots”, which can function as pressure cookers (or slow cookers). Pressure cookers are useful because the food can be cooked to doneness in a very short period of time, compared to cooking on the stovetop or in the oven. A typical pressure setting for the pot is “10 psi” which is the pressure added to atmospheric pressure for the cooking process. Given that you are cooking at the boiling point of H2O(l), and you have the information given in Problem 4.16, how high a temperature are you cooking at when you set the additional pressure to 10 psi? (1.0 psi = 51.7 torr)
Rapid estimation of resilient modulus of subgrade soils using performance-related soil properties
Published in International Journal of Pavement Engineering, 2021
Junhui Zhang, Junhui Peng, Ling Zeng, Jue Li, Feng Li
The pressure plate test was completed to obtain the SWCC of the soil samples tested in this study. This apparatus comprises a high-pressure nitrogen gas bottle, a pressure reducing valve, a pressure-cooker, a ceramic plate and so forth. For this test, soil samples of 61.8 mm diameter and 10 mm height were prepared by a cutting ring under four relative compactions (85%, 90%, 95%, and 100%) to study the influence of relative compaction on SWCC, and at the optimum moisture content. Then the samples were put in a vacuum saturator and taken out 48 h later for equilibrating the internal moisture content for saturation. Thereafter, the mass was recorded when there is no water on the surface of the sample. The ceramic plate was subsequently placed into the vacuum chamber and saturated. The following steps were to place the saturated samples on the ceramic plate and add air pressure until reaching equilibrium. After that, the water contents of the samples were measured and the pressure values were read. By repeating the above steps, the SWCCs for the soil samples can be developed.
Predicting resilient modulus of fine-grained subgrade soils considering relative compaction and matric suction
Published in Road Materials and Pavement Design, 2021
Junhui Zhang, Junhui Peng, Weizheng Liu, Weihua Lu
The pressure plate test was completed to get the SWCC of the sandy low-plasticity clay tested in this study (Zhang, Peng, Zeng, Li, & Li, 2019). This apparatus consists of a high-pressure nitrogen gas bottle, a reducing valve, a pressure-cooker, a ceramic plate and so on. For this test, soil samples of 61.8 mm diameter and 10 mm height were made by a cutting ring at different relative compaction (85%, 90%, 95% and 100%) and at the optimum moisture content. Then the samples were put in a vacuum saturator and taken out 48 h later for equilibrating the internal moisture content for saturation. Thereafter, the mass was recorded when there is no water on the surface of samples. Subsequently, the ceramic plate was put into the vacuum chamber and saturated. The following steps were to place the saturated samples on the ceramic plate and add air pressure until reaching a balance state. After that, the moisture contents of the samples were measured and the pressure values were read. By repeating the above steps, the SWCCs for the soil samples can be developed.
Characterisation of stress and moisture-dependent resilient behaviour for compacted clays in South China
Published in Road Materials and Pavement Design, 2020
Junhui Zhang, Junhui Peng, Jianlong Zheng, Yongsheng Yao
It is expensive and complicated to measure the soil suction of specimens for a triaxial test (Ng, Zhou, Yuan, & Xu, 2013). Thus, the soil–water characteristic curve (SWCC) of the high plasticity clay was developed by the pressure plate test to help predict the resilient modulus, which was assumed not to change during the process of the triaxial test. The pressure plate consists of a high-pressure nitrogen gas bottle, a reducing valve, a pressure-cooker, a ceramic plate, and so on. For this test, soil samples of 618 mm diameter and 100 mm height were made by a cutting ring at different compacted degrees (90%, 93%, and 96%) and at the optimum moisture content. Then the samples were put in a vacuum saturator and taken out 48 h later for equilibrating the internal moisture content. Thereafter the mass was recorded when there is no water on the surface of samples. Subsequently, the ceramic plate was put into the pressure-cooker and saturated. The following steps were to place the saturated samples on the ceramic plate and add air pressure until reaching a balance state. After that, the moisture contents of the samples were measured and the pressure values were read. By repeating the above steps, the SWCCs for the soil samples can be developed.