scholarly journals Observed Long-term Water Content Change in Concrete Track Roadbed by Rainfall

2015 ◽  
Vol 14 (4) ◽  
pp. 35-43
Author(s):  
Chanyong Choi ◽  
Hunki Kim ◽  
Sangbeom Yang ◽  
KiYoung Eum
Keyword(s):  
Water Content ◽  
Content Change ◽  
Water Content Change

Experimental Research on Compression Characteristics of Compacted Loess

2013 ◽  
Vol 275-277 ◽  
pp. 387-390
Author(s):  
Min Wang ◽  
Xiao Hong Bai
Keyword(s):  
Water Content ◽  
Strain Curve ◽  
Ultimate Strain ◽  
Tangent Modulus ◽  
Compression Tests ◽  
Content Change ◽  
Compaction Energy ◽  
Compacted Loess ◽  
Water Content Change ◽  
Initial Tangent Modulus

A series of compression tests were conducted on the samples taken from compacted soil site in Lulling, in order to investigate the compressibility of compacted loess in different water content and different compaction energy. Through statistics analysis of the testing data, the stress-strain curve of compacted loess could be expressed with Hyperbolic form. And the relation between initial tangent modulus and water content change coefficient was founded by introducing the water content change coefficient. The result shows that at the same compaction energy, the initial tangent modulus decreases and the ultimate strain increases as water content increases; while at the same water content change coefficient, the initial tangent modulus increases and the ultimate strain decreases as compaction effort increases.

Influences of Water Content on Compression Strength of Mortar

2010 ◽  
Vol 168-170 ◽  
pp. 628-631
Author(s):  
Qiang Ma ◽  
Tao Wang
Keyword(s):  
Moisture Content ◽  
Water Content ◽  
Compression Strength ◽  
Content Change ◽  
Strength Formula ◽  
Water Content Change

Water content has important influences on the compression strength of mortar material. It is necessary to consider these influences when evaluate performances of mortar structures after flood soaking. This paper carried out experiments to explore the rule of water content’s effects on the compression strength of mortar. The results showed that 6 hours after the mortar in the soaking water content close to saturation, moisture content about 14%, after 6 hours the water content change little. Compression strength decreases rapidly after the mortar soaked. Finally, the mortar compression strength formula considering the effects of water content is regressed.

scholarly journals EFFECT OF DRYING-WETTING PROCESS ON FRICTION CAPACITY AND ADHESION FACTOR OF PILE FOUNDATION IN CLAYEY SOIL

2015 ◽  
Vol 77 (11) ◽  
Author(s):  
Daniel Tjandra ◽  
Indarto Indarto ◽  
Ria Asih Aryani Soemitro
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Pile Foundation ◽  
Undrained Shear Strength ◽  
Clayey Soils ◽  
Content Change ◽  
Adhesion Factor ◽  
Undrained Shear ◽  
Water Content Change ◽  
Friction Capacity

Clayey soils had a seasonal water content change, which occurred in the zone known as active zone. This change happen due to the seasonal drying and wetting cycles, which affects the fluctuation of water table. The water content variation causes the change in undrained shear strength and these changes have an impact to the friction capacity and adhesion factor of pile foundation. This paper discusses the undrained shear strength, friction capacity of pile and adhesion factor of piles under drying and wetting cycles. Research was conducted on two different types of clayey soils. Laboratory experiments for varying soil water content were done. Soil samples were placed in a cylinder tube, the concrete pile model was then inserted into the soil. The diameter of the tube was about 15 times of the pile diameter. Loading test was carried out to investigate pile friction capacity. The result of this study showed that there was great effect of seasonal water content change on undrained shear strength, friction capacity and also adhesion factor of pile in the clayey soils.

Plasticity Evaluation of Porcelain Body Depend on Aging Period and Water Content Change Using Capillary Rheometer

2012 ◽  
Vol 49 (3) ◽  
pp. 231-235
Author(s):  
Geun-Hee Kim ◽  
Jae-Hwan Pee ◽  
Jin-Ho Kim ◽  
Young-Hwan Kim ◽  
Woo-Seok Cho ◽  
...  
Keyword(s):  
Water Content ◽  
Porcelain Body ◽  
Capillary Rheometer ◽  
Aging Period ◽  
Content Change ◽  
Water Content Change

scholarly journals Long Term Effects of Ploughing and Conservation Tillage Methods on Earthworm Abundance and Crumb Ratio

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1552 ◽  
Author(s):  
Igor Dekemati ◽  
Barbara Simon ◽  
Igor Bogunovic ◽  
Ivica Kisic ◽  
Katalin Kassai ◽  
...  
Keyword(s):  
Water Content ◽  
Water Conservation ◽  
Conservation Tillage ◽  
Soil Tillage ◽  
Long Term Effects ◽  
No Till ◽  
Cover Ratio ◽  
One Year ◽  
Tillage Methods

In addition to the dry (D) and rainy (R) seasons, a combination of the two i.e., rainy-dry (RD) and dry-rainy (DR), can also be observed in one year. The effects of the dry (D) and rainy (R) on soil are known, hence we hypothesized that the effects of the rainy-dry (RD) and dry-rainy (DR) periods on soil may differ from the former assessments. The aim of the study is to investigate the effect of six tillage treatments (ploughing—P, disk tillage—DT, loosening—L, tine tillage (a deeper—T and a shallower—ST) and no-till—NT) on earthworm abundance and crumb ratio during a long-term research (16 years) on Chernozems. The results related to the four year-groups (D, R, RD, and DR) with different residue cover. Seven degrees of cover ratio (between 12.5% and 62.5%) were selected on stubbles. Higher cover ratio (≥52.5%) improved water conservation, increased earthworm abundance (31 and 41 ind m–2) and crumb (78 and 82%) ratio (p < 0.01). R year came first in the rank of water content and earthworm abundance and DR proved to be more favorable for crumb formation. Considering the rank of soil tillage treatments, ST takes first place in evaluation of soil water content (SWC) and crumb ratio, and NT for earthworm abundance.

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