scholarly journals Effect of Tea Waste on Cracking of Foundation Soil

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Binbin Yang ◽  
Zepeng Zhang ◽  
Wenlong Ma ◽  
Mingming Hu ◽  
Yaning Zhang
Keyword(s):  
Fractal Dimension ◽  
Water Content ◽  
Soil Samples ◽  
Stage Iii ◽  
Residual Water ◽  
Foundation Soil ◽  
Desiccation Cracks ◽  
Residual Water Content ◽  
Tea Waste ◽  
Water Holding

Desiccation cracks form on the surface of foundation soils due to matric suction and surface shrinkage with water loss. This paper investigates the effect of tea waste on the change of water content and cracking characteristics of foundation soil during drying. Digital image processing was carried out based on laboratory experiments. The characteristics are monitored with a variation in water content. The effects of different amounts of tea waste on soil drying and cracking were obtained, in order to provide an efficient and new green sustainable material for improving soil evaporation cracking under drought conditions. The results show that the development of cracks of soil samples with tea waste can be categorized into three stages in accordance with the fractal dimension of the desiccation cracks: Stages I, II, and III. The desiccation cracks in Stage III are wider and longer than those in Stages I and II, however, the maximum fractal dimension and stability are also obtained in Stage III. The residual water content of the sample without tea waste is 1.5%. The residual water content of the samples containing 4% and 8% tea waste is 4.6% and 5.4%, respectively, which shows that the tea waste can effectively improve the residual water content of the foundation soil and the water holding capacity of the soil. The fractal dimension of cracks on the soil samples increases gradually with drying. The total length of cracks increases and the development of cracks is more complex. The cracking time of soil samples with different tea waste contents is different. The soil samples with 8% tea waste content crack first. Combined with the variation characteristics of water content, tea waste has water absorption and improves the water holding capacity and stability of foundation soil.

scholarly journals Influence of Clay Fraction and Mineral Composition on Unsaturated Characteristics of Cohesive Foundation Soil in Airports

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jun Feng ◽  
Guangze Zhang
Keyword(s):  
Water Content ◽  
Mineral Composition ◽  
Linear Correlation ◽  
Clay Fraction ◽  
Residual Water ◽  
Foundation Soil ◽  
Nonlinear Correlation ◽  
Silt Fraction ◽  
Residual Water Content ◽  
Clay Fraction Content

Taking unsaturated clay foundation soil of an airport project in Hefei as the research object, the effects of particle gradation and mineral composition on the unsaturated soil properties were analyzed through two kinds of tests. The results show that there is a good correlation between the residual water content and the clay fraction or silt fraction content in the grading, and the residual water content has a significant positive linear correlation with the clay fraction content, but a negative linear correlation with the silt fraction content. Residual matric suction has a nonlinear correlation with clay fraction or silt fraction content in gradation, which has a significant nonlinear negative correlation with clay fraction content and a positive nonlinear correlation with silt fraction content. The residual water content and the residual matric suction have obvious linear relationship with the content of montmorillonite but have no obvious correlation with the content of illite. The water-storage coefficient of unsaturated airfield foundation soil decreases exponentially with the increase of clay content and montmorillonite content.

Laboratory test investigations on soil water characteristic curve and air permeability of municipal solid waste

2018 ◽  
Vol 36 (5) ◽  
pp. 463-470 ◽  
Author(s):  
Jianyong Shi ◽  
Xun Wu ◽  
Yingbo Ai ◽  
Zhen Zhang
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Water Content ◽  
Permeability Coefficient ◽  
Inflection Point ◽  
Void Ratio ◽  
Characteristic Curve ◽  
Air Permeability ◽  
Residual Water ◽  
Residual Water Content

The air permeability coefficient has a high correlation with the water content of municipal solid waste. In this study, continuous drying methodology using a tension meter was employed to construct the soil water characteristic curve of municipal solid waste (M-SWCC). The municipal solid waste air permeability test was conducted by a newly designed apparatus. The measured M-SWCC was well reproduced by the van Genuchten (V-G) model and was used to predict the parameters of typical points in M-SWCC, including saturated water content, field capacity, residual water content and water content at the inflection point. It was found that the M-SWCC was significantly influenced by void ratio. The final evaporation and test period of M-SWCC increase with the increase in void ratio of municipal solid waste. The evolution of air permeability coefficient with water content of municipal solid waste depicted three distinct characteristic stages. It was observed that the water contents that corresponded to the two cut-off points of the three stages were residual water content and water content at the inflection point, respectively. The air permeability coefficient of municipal solid waste decreased with the increase of the water content from zero to the residual water content. The air permeability coefficient was almost invariable when the water content increased from residual water content to the water content at the inflection point. When the water content of municipal solid waste exceeded the water content at the inflection point, the air permeability coefficient sharply decreased with the increase of water content.

scholarly journals Effects of residual suction and residual water content on the estimation of permeability function

Geoderma ◽  
2017 ◽  
Vol 303 ◽  
pp. 165-177 ◽  
Author(s):  
Qian Zhai ◽  
Harianto Rahardjo ◽  
Alfrendo Satyanaga
Keyword(s):  
Water Content ◽  
Residual Water ◽  
Residual Water Content ◽  
Permeability Function

Effect of the residual water content in gels on solution combustion synthesis temperature

2019 ◽  
Vol 93 (2) ◽  
pp. 251-261 ◽  
Author(s):  
Sh. M. Khaliullin ◽  
V. D. Zhuravlev ◽  
V. G. Bamburov ◽  
A. A. Khort ◽  
S. I. Roslyakov ◽  
...  
Keyword(s):  
Water Content ◽  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Synthesis Temperature ◽  
Residual Water ◽  
Solution Combustion ◽  
Residual Water Content

The right approach how to design the conditioning system of a sugar silo

2017 ◽  
pp. 476-480
Author(s):  
Jörg Linek ◽  
Norbert Rösch
Keyword(s):  
Water Content ◽  
Energy Efficient ◽  
Weather Conditions ◽  
Air Distribution ◽  
Residual Water ◽  
Work Safety ◽  
Efficient Operation ◽  
Residual Water Content ◽  
Heated Air ◽  
The Right

In the light of the constantly growing requirements regarding efficiency, work safety and increasing capacities the design of silos and its conditioning systems demands for customer-specific and experience-based approach. After production fresh sugar has a residual water content which can lead to agglomerations during storage. This affects the product quality, discharge and transport from the silo and endangers staff who has to remove cakings manually. Therefore it is necessary to prepare and distribute the air constantly at optimal conditions. Time of conditioning, air quantity and humidity are the parameters to be determined simultaneously based on the type of silo, residual water content of stored sugar, size of sugar crystals, product feed-in rate and environmental conditions [1]. In the design the amount of water to be removed, air distribution in the sugar bed and temperature are considered. Depending on weather conditions the supplied air is mixed with fresh, dried, cooled or heated air to meet the needed conditions and to enable an energy-efficient operation of the plant.

Sign in / Sign up

Export Citation Format

Share Document