Harnessing microbially induced calcite precipitates to use in improving the engineering properties of loose sandy soils

Sadhana ◽  
2021 ◽  
Vol 46 (1) ◽  
Author(s):  
SANGEETA SHOUGRAKPAM ◽  
ASHUTOSH TRIVEDI
Keyword(s):  
Sandy Soils ◽  
Engineering Properties

scholarly journals Enhancement of the thermal conductivity of sands via microbially-induced calcite precipitation

2020 ◽  
Vol 205 ◽  
pp. 09011
Author(s):  
Alejandro Martinez ◽  
Lin Huang ◽  
Michael G. Gomez
Keyword(s):  
Thermal Conductivity ◽  
Ground Improvement ◽  
Soil Column ◽  
Sandy Soils ◽  
Shear Stiffness ◽  
Degree Of Saturation ◽  
Engineering Properties ◽  
Calcite Precipitation ◽  
Microbially Induced Calcite Precipitation ◽  
Partially Saturated

Energy piles and ground source heat pump systems have been shown to provide sustainable alternatives for temperature regulation in buildings and other applications such as road de-icing. However, their efficiency can be undermined in partially-saturated and dry sandy soils due to the relatively low thermal conductivity (kt) of these materials. Microbially-Induced Calcite Precipitation (MICP) has been demonstrated to be an environmentally-conscious ground improvement technology capable of modifying the engineering properties of sandy soils including increases in shear stiffness and strength and decreases in hydraulic conductivity. These improvements result from the precipitation of calcium carbonate crystals at inter-particle contacts and on particle surfaces. This paper presents results from a soil column study aimed at investigating changes in soil kt during MICP treatments and subsequent desaturation using a poorly- graded sand. The results indicate that while bio-cementation can increase soil kt, the level of enhancement depends on the degree of saturation. For instance, increases of up to 330% were measured under dry conditions while only modest increases of about 15% were measured under saturated conditions. MICP treatment may therefore be most effective at enhancing the kt of partially-saturated and dry sands. In addition, the similarity between the evolution of kt and shear wave velocity (Vs) during MICP treatment suggests that kt may provide a new method to assess cementation level and contact quality.

Population dynamics of Viola pedata on deep sandy soils in a fragmented and degraded landscape

2020 ◽  
Vol 21 (1) ◽  
pp. 35-44
Author(s):  
Janet L Gehring ◽  
Caitlin Foster ◽  
Alan Yepsen
Keyword(s):  
Population Dynamics ◽  
Sandy Soils

IN SITU SOIL FLUSHING - STUDIES ON REMEDIATION EFFICIENCY OF POLLUTED SANDY SOILS WITH ORGANIC ACIDS

2012 ◽  
Vol 11 (12) ◽  
pp. 2163-2168
Author(s):  
Alexandra-Dana Chitimus ◽  
Valentin Nedeff ◽  
Emilian Florin Mosnegutu ◽  
Mirela Panainte
Keyword(s):  
Organic Acids ◽  
Sandy Soils ◽  
Soil Flushing ◽  
Remediation Efficiency

Contributions to the Knowledge of Sandy Soils from Oltenia Plain

2020 ◽  
Vol 71 (1) ◽  
pp. 192-200
Author(s):  
Anca-Luiza Stanila ◽  
Catalin Cristian Simota ◽  
Mihail Dumitru
Keyword(s):  
Chemical Properties ◽  
Soil Formation ◽  
Sandy Soils ◽  
Physical Geography ◽  
Parent Material ◽  
Negative Effects ◽  
Small Water ◽  
Wind Characteristic ◽  
The One ◽  
Physical And Chemical

Highlighting the sandy soil of Oltenia Plain calls for a better knowledge of their variability their correlation with major natural factors from each physical geography. Pedogenetic processes specific sandy soils are strongly influenced by nature parent material. This leads, on the one hand, climate aridity of the soil due to strong heating and accumulation of small water reserves, consequences emphasizing the moisture deficit in the development of the vegetation and favoring weak deflation, and on the other hand, an increase in mineralization organic matter. Relief under wind characteristic sandy land, soil formation and distribution has some particularly of flat land with the land formed on the loess. The dune ridges are less evolved soils, profile underdeveloped and poorly supplied with nutrients compared to those on the slopes of the dunes and the interdune, whose physical and chemical properties are more favorable to plant growth.Both Romanati Plain and the Blahnita (Mehedinti) Plain and Bailesti Plain, sand wind shaped covering a finer material, loamy sand and even loess (containing up to 26% clay), also rippled with negative effects in terms of overall drainage. Depending on the pedogenetic physical and geographical factors that have contributed to soil cover, in the researched were identified following classes of soils: protisols, cernisols, cambisols, luvisols, hidrisols and antrosols.Obtaining appropriate agricultural production requires some land improvement works (especially fitting for irrigation) and agropedoameliorative works. Particular attention should be paid to preventing and combating wind erosion.

Response of Tifway Bermudagrass to Sulfur on Sandy Soils 1

1972 ◽  
Vol 64 (3) ◽  
pp. 359-361 ◽  
Author(s):  
G. M. Volk ◽  
G. C. Horn
Keyword(s):  
Sandy Soils
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