A Comprehensive Approach to Determine Intrinsic Compressibility of Reconstituted Clays with Various Initial Water Contents

2018 ◽  
pp. 85-98
Author(s):  
Jianjun Ma ◽  
Mingyue Qian ◽  
Chuang Yu ◽  
Xiaoniu Yu
Keyword(s):  
Comprehensive Approach ◽  
Initial Water ◽  
Water Contents

Behavior of unsaturated weathered residual granite soil with initial water contents

2010 ◽  
Vol 113 (1-4) ◽  
pp. 1-10 ◽  
Author(s):  
Chan-Kee Kim ◽  
Tae-Hyung Kim
Keyword(s):  
Initial Water ◽  
Granite Soil ◽  
Water Contents

scholarly journals Compressibility behaviour of remoulded, fine-grained soils and correlation with index properties

2000 ◽  
Vol 37 (3) ◽  
pp. 712-722 ◽  
Author(s):  
A Sridharan ◽  
H B Nagaraj
Keyword(s):  
Liquid Limit ◽  
Plasticity Index ◽  
Engineering Properties ◽  
Test Results ◽  
Index Properties ◽  
Initial Water ◽  
Fine Grained ◽  
Wide Range ◽  
The Relationship ◽  
Water Contents

Correlating engineering properties with index properties has assumed greater significance in the recent past in the field of geotechnical engineering. Although attempts have been made in the past to correlate compressibility with various index properties individually, all the properties affecting compressibility behaviour have not been considered together in any single study to examine which index property of the soil correlates best with compressibility behaviour, especially within a set of test results. In the present study, 10 soils covering a sufficiently wide range of liquid limit, plastic limit, and shrinkage limit were selected and conventional consolidation tests were carried out starting with their initial water contents almost equal to their respective liquid limits. The compressibility behaviour is vastly different for pairs of soils having nearly the same liquid limit, but different plasticity characteristics. The relationship between void ratio and consolidation pressure is more closely related to the shrinkage index (shrinkage index = liquid limit - shrinkage limit) than to the plasticity index. Wide variations are seen with the liquid limit. For the soils investigated, the compression index relates better with the shrinkage index than with the plasticity index or liquid limit.Key words: Atterberg limits, classification, clays, compressibility, laboratory tests.

Simultaneous Measurements of Spiracular and Cuticular Water Losses in Periplaneta Americana: Implications for Whole-Animal Mass Loss Studies

1991 ◽  
Vol 161 (1) ◽  
pp. 439-453 ◽  
Author(s):  
J. MACHIN ◽  
P. KESTLER ◽  
G. J. LAMPERT
Keyword(s):  
Water Loss ◽  
Periplaneta Americana ◽  
Water Losses ◽  
Initial Water ◽  
Variable Activity ◽  
Cuticular Permeability ◽  
Order Of Magnitude ◽  
Animal Mass ◽  
Principal Contributor ◽  
Water Contents

Spiracular and cutaneous water loss through the cuticle and spiracles of Periplaneta americana was measured in animals of differing initial water contents under controlled temperature, humidity and airflow conditions, by continuous weighing (resolution ±10μg). Stable water loss rates (2.09×10−8 to 3.47×10−8gh−1cm−2Pa−1) were as much as an order of magnitude less than those reported in earlier studies employing intermittent weighing techniques. We suggest that increased water loss caused by substantial increases in ventilatory water loss during the episodic disturbances required by intermittent weighing is the principal contributor to this discrepancy. Water losses, as well as the interval between spiracular ventilations, decreased with water content. However, greater variation was primarily due to interruptions of the regular cyclic pattern of ventilation by highly variable, activity-related bouts of increased ventilatory loss. Variations in water loss appear to be too large and too rapid to be convincingly explained in terms of cuticular conductance. Our results suggest that previous experiments using 5% CO2 anaesthesia, linking changes in total water loss to the conducting properties of the cuticle, were not valid. There seems to be no adaptive value for the proposed voluntary increases in cuticular permeability in an animal where ventilatory water losses can be so high.

Effects of differential drying rates on viability retention of recalcitrant seeds of Ekebergia capensis

1998 ◽  
Vol 8 (4) ◽  
pp. 463-471 ◽  
Author(s):  
N. W. Pammenter ◽  
Valerie Greggains ◽  
J. I. Kioko ◽  
J. Wesley-Smith ◽  
Patricia Berjak ◽  
...  
Keyword(s):  
Water Content ◽  
Exponential Function ◽  
Time Course ◽  
Drying Rate ◽  
Recalcitrant Seeds ◽  
Tissue Water ◽  
Initial Water ◽  
Viability Loss ◽  
Drying Rates ◽  
Water Contents

AbstractThe drying rate of whole seeds of Ekebergia capensis (Meliaceae) was shown to influence the response to desiccation, with rapidly dried seeds surviving to lower water contents. Short-term rapid drying (to water contents higher than those leading to viability loss) actually increased the rate of germination. The form of the time course of decline of axis water content varied with drying rate; slow drying could be described by an exponential function, whereas with rapid drying initial water loss was faster than predicted by an exponential function. These observations suggest that slow drying brought about homogeneous dehydration and that the rapid drying was uneven across the tissue. This raised the possibility that the different responses to dehydration were a function of different distributions of water in the axis tissue under the two drying regimes. However, ultrastructural observations indicated that different deleterious processes may be occurring under the different drying treatments. It was tentatively concluded that a major cause of viability loss in slowly dried material was likely to be a consequence of aqueous-based processes leading to considerable membrane degradation. Uneven distribution of tissue water could not be rejected as a contributory cause of the survival of rapidly dried seeds to low bulk water contents. The differential response to dehydration at different drying rates implies that it is not possible to determine a ‘critical water content’ for viability loss by recalcitrant seeds.

Hysteresis During Infiltration and Redistribution in a Soil Column at Different Initial Water Contents

1971 ◽  
Vol 7 (1) ◽  
pp. 111-127 ◽  
Author(s):  
Georges Vachaud ◽  
Jean-Louis Thony
Keyword(s):  
Soil Column ◽  
Initial Water ◽  
Water Contents

Compression reference of soil structure evaluation with reconstituted clays at different initial water contents

2017 ◽  
Vol 36 (7) ◽  
pp. 759-767
Author(s):  
Ling-Ling Zeng ◽  
Zhen-Shun Hong ◽  
Yu-Jun Cui ◽  
Martin D. Liu
Keyword(s):  
Soil Structure ◽  
Initial Water ◽  
Structure Evaluation ◽  
Water Contents

Effect of Salinity on Strength Behavior of Cement-treated Dredged Clay at High Initial Water Contents

2019 ◽  
Vol 23 (10) ◽  
pp. 4288-4296
Author(s):  
Jie Yin ◽  
Wen-xia Han ◽  
Gui-zhong Xu ◽  
Ming-ming Hu ◽  
Yong-hong Miao
Keyword(s):  
Initial Water ◽  
Strength Behavior ◽  
Water Contents

Experimental Study on Dewatering Dredged Clay with Ventilating Vacuum Method

2011 ◽  
Vol 261-263 ◽  
pp. 1650-1654 ◽  
Author(s):  
Feng Ji ◽  
Jian Wen Ding ◽  
Zhen Shun Hong ◽  
Yue Gui
Keyword(s):  
Experimental Study ◽  
Spatial Distribution ◽  
Surface Water ◽  
Water Content ◽  
Liquid Limit ◽  
Initial Water Content ◽  
Distribution Law ◽  
Initial Water ◽  
Vacuum Method ◽  
Water Contents

A series of model tests were performed on dredged clay with high initial water contents for investigating the dewatering behavior by ventilating vacuum method (VVM). The results shows that the surface water separated from dredged clay can be quickly removed by VVM in which a new pattern PVD is used. In addition, the method also speeds up the deposition of dredged clay. The volume of dredged clay with an initial water content of 4.5 times liquid limit decreases by 50 percent within two months. This paper also investigated the spatial distribution law of water content by TDR method. It is found that the drainage distance of PVD is about 0.3-0.4m.

Sign in / Sign up

Export Citation Format

Share Document