Experimental study on frozen-heave influence factors for graded gravel in surface layer of passenger dedicated line

2015 ◽  
pp. 33-35
Author(s):  
Kai Han ◽  
Yuan Liu ◽  
Yang Xie ◽  
Tan Jiao
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Influence Factors ◽  
Passenger Dedicated Line

Experimental study on anti-icing and deicing performance of polyurethane concrete as road surface layer

2018 ◽  
Vol 161 ◽  
pp. 598-605 ◽  
Author(s):  
Jun Chen ◽  
Xie Ma ◽  
Hao Wang ◽  
Pengyu Xie ◽  
Wei Huang
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Road Surface

scholarly journals Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 57 ◽  
Author(s):  
Miroslav Gombár ◽  
Alena Vagaská ◽  
Marta Harničárová ◽  
Jan Valíček ◽  
Milena Kušnerová ◽  
...  
Keyword(s):  
Surface Layer ◽  
Layer Thickness ◽  
Anodic Oxidation ◽  
Current Practice ◽  
Oxidation Process ◽  
Influence Factors ◽  
Basic Criterion ◽  
Electrolysis Method ◽  
Current Densities ◽  
Anodic Oxidation Process

The current practice in the field of anodic oxidation of aluminium and its alloys is based mainly on a set of partial empirical experiences of technologists obtained during surface treatment. The aim of the presented paper is deeper and more complex identification of the influence of chemical and technological factors acting during the anodic oxidation process especially on the thickness of the formed surface layer by the electrolysis method in a sulfuric acid solution. The current density was selected as the basic criterion for verification evaluation and analysis of experimentally obtained data, in accordance with Faraday’s laws. For current densities of 1 to 5 A·dm−2, the synergy of significant influence factors was identified, and mathematical and statistical models were then developed to predict the thickness of the surface layer with a relative accuracy of up to 10%. The presented paper does not only focus on the observation of the thickness of the surface layer desired by the customer, but also on the monitoring of this thickness in relation to the overall layer thickness of the coating.

Study on Prediction Model of Shrinkage and Creep of Prestressed Concrete Beam in Passenger Dedicated Line

2011 ◽  
Vol 255-260 ◽  
pp. 3998-4002
Author(s):  
Jun Li Luo ◽  
Zhi Sheng Xu ◽  
Jun Li ◽  
Ji Hao Yang
Keyword(s):  
Prestressed Concrete ◽  
High Speed ◽  
Concrete Beam ◽  
Influence Factors ◽  
Creep Model ◽  
High Speed Railway ◽  
Modified Model ◽  
Shrinkage And Creep ◽  
Prestressed Concrete Bridge ◽  
Passenger Dedicated Line

To improve the calculation precision of deformation in prestressed concrete bridge in passenger dedicated line and accurately predict the development of shrinkage and creep in bridge, a universal applicable modified model was put forward in this paper based on ACI 209R(1992) shrinkage and creep model. In the modified model, three influence factors-slump, strength and reinforcement - are corrected. And the modified model results were compared with the experimental results. It shows that the modified model can more accurately predict the development of shrinkage and creep of high-speed railway bridge and better accord with the law of it.

scholarly journals Ice Lensing, Thermal Diffusion and Water Migration in Freezing Soil

1967 ◽  
Vol 6 (47) ◽  
pp. 681-694 ◽  
Author(s):  
Andrew C. Palmer
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Ice Nucleation ◽  
Water Migration ◽  
One Dimensional ◽  
Freezing Soil ◽  
Infinite Mass ◽  
Soil Thermal Diffusivity ◽  
Homogeneous Soil ◽  
Water Diffusion Coefficient

When a surface layer of the soil freezes, both heat and water diffuse from the unfrozen soil beneath to the frozen region. Often the soil does not freeze homogeneously but distinct ice lenses form. An analysis of the diffusion and ice nucleation processes suggests conditions under which ice lensing can be expected; in particular, it is shown that multiple ice lenses cannot form unless the soil thermal diffusivity is greater than the water diffusion coefficient. Analysis of a simple one-dimensional case (a semi-infinite mass of homogeneous soil whose surface temperature is suddenly lowered) gives the temperature and water-content fields as functions of time; these agree with those observed in an experimental study of freezing clay.

Improved Model by Grouting Graded Gravel in Subgrade Surface Layer

2014 ◽  
Vol 971-973 ◽  
pp. 1009-1012
Author(s):  
Zhen Zhang ◽  
Man Luo ◽  
Yuan Liu
Keyword(s):  
Surface Layer ◽  
Model Test ◽  
Frost Heave ◽  
Actual Condition ◽  
Model Improvement ◽  
Improved Model ◽  
Passenger Dedicated Line

As the major component of surface layer in subgrade, the frost heave of subgrade is determined the frost heave of graded gravel. The remediation of frost heave of graded gravel by grouting was introduced, the properties of slurry and the actual condition of roadbed, the method of model improvement tests by grouting have been investigated, and the grouting effect of model test was analyzed, the results indicate that: the slurry have been shown well bounding with the graded gravel and the groutability of the slurry met the test requirement. The permeability of graded gravel decreased significantly after grouting, and the permeability of graded gravel could be improved by grouting. The frost heave of graded gravel after improved meet the requirement of passenger dedicated line. The model test of grouting provided an reference to the field grouting test of graded gravel in subgrade.

Sign in / Sign up

Export Citation Format

Share Document