scholarly journals Soil genetics in its complex stabilization

2021 ◽  
Vol 23 (6) ◽  
pp. 190-200
Author(s):  
V. S. Churilin ◽  
G. V. Pushkareva
Keyword(s):  
Multicomponent System ◽  
Qualitative Evaluation ◽  
West Siberia ◽  
Strength Properties ◽  
Soil Composition ◽  
Seasonal Freezing ◽  
Subgrade Soils ◽  
Northern Regions ◽  
Mineral Additive ◽  
Cement Soil

The problem of the inter-repair time of automobile roads in Russia can be solved by the reinforcing the subgrade soils with cement. Soil is a multicomponent system affecting the deformation and strength properties of the composition (cement and soil). The cement-soil composition has drawbacks, especially in seasonal freezing regions, which affects its durability.In order to increase the composition efficiency, the Nicoflok polymer-mineral additive is used to strengthen subgrade with cement. However, the influence of the type regional and genetic soil on strength properties of the cement-soil + Nicoflok composition is yet studied.The paper presents the factor analysis of the influence of soil genetics on the composition strength properties. The study of the multicomponent system includes the response surface of the soil genetics on the strength properties of the composition. Additional studies are required to move from the qualitative evaluation of the soil genetics on the composition (cement-soil + Nicoflok) to the quantitative evaluation. These studies must be carried out according to a single scheme, which regards the seasonal freezing of subgrade soils in the northern regions of European Russia and West Siberia.

scholarly journals Mobile forms of metals in soils in the Nadym-Pur interfluve (Western Siberia)

2020 ◽  
pp. 136-145
Author(s):  
E. A. Romanenko ◽  
D. V. Moskovchenko ◽  
A. A Kudryavtsev ◽  
G. N. Shigabaeva
Keyword(s):  
Metal Content ◽  
Western Siberia ◽  
Total Content ◽  
Fluorescence Analysis ◽  
West Siberia ◽  
Taiga Zone ◽  
Fe Content ◽  
Mobile Forms ◽  
Northern Regions ◽  
Accumulation Of Metals

The total concentrations of metals (Fe, Mn, Cu, Ni, Cr, Sr) and their mobile forms extracted by an ammonium acetate buffer (pH = 4,8) were studied in soils samples collected from Nadym-Pur interfluve (West Siberia), near the northern limit of the taiga zone. The heavy metal content was determined in 55 background soil samples and in 25 pyrogenic ones. Gross content was determined on a spectrometer "SPECTROSCAN MAX-GV" using X-ray fluorescence analysis. Mobile forms of metals were determined on a ContrAA 700 atomic absorption spectrometer by flame and electrothermal methods. The statistics are calculated using the Excel software package. The study confirmed the weak accumulation of metals in the soils of the northern regions of Western Siberia. The total content below the soil world average for Fe is 5 times, Mn – 3 times, Sr – 2 times, Cr – 1,4 times. The content of mobile forms varies widely depending on the amount of organic matter. The percentage of mobile forms of metals from the total content was: Cr – 0.84%, Fe – 1,2%, Sr – 3,8%, Mn – 8,7%, Ni – 15%. In the profile of podzols, the distribution of mobile forms of metals has an eluvial-illuvial character. Mn and Sr accumulate intensively in the surface organogenic horizons, and the Fe content increases in the BF horizon. Minimum values are marked in horizon E. In pyrogenic soils, there is an increase in the content of mobile forms of metals due to the intake of ash. Metal content usually not exceeded the maximal permissible concentrations for soils.

Influence of Soil Grading on the Mechanical Behavior of Earth Cement Blocks

MRS Advances ◽  
2020 ◽  
Vol 5 (54-55) ◽  
pp. 2771-2782
Author(s):  
Sathiyapireyanga Jeyasegaram ◽  
Navaratnarajah Sathiparan
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Water Absorption ◽  
Experimental Program ◽  
Soil Composition ◽  
Fine Content ◽  
Uniformity Coefficient ◽  
Flexural Tensile Strength ◽  
Soil Cement ◽  
Cement Soil

AbstractThe characteristics of earth cement blocks depend on soil composition, grading of the soil, cement-soil ratio and water content, etc… In the present study, an experimental program is conducted to evaluate the influence of soil grading in the mechanical properties of earth cement blocks. Five gradings of soil used for the preparation of earth cement blocks. Soil grading effect on following properties of earth-cement blocks such as block density, compressive strength in wet and dry condition, flexural tensile strength in wet and dry condition, and water absorption was compared. Results show that the properties of the earth cement blocks are dependent upon the fine content and uniformity coefficient of the soil. The increase in the finer content in mortar improves water absorption, compressive strength and flexural tensile strength.

(A review) E. D. Lapshina. The bog vegetation of the south-east West Siberia: monograph. Novosibirsk, 2010. 186 p.

2012 ◽  
pp. 135-138
Author(s):  
B. M. Mirkin ◽  
L. G. Naumova ◽  
E. Z. Baisheva ◽  
V. B. Martynenko
Keyword(s):  
Western Siberia ◽  
West Siberia ◽  
The South ◽  
Large White ◽  
White Spots ◽  
Northern Regions ◽  
Floristic Classification ◽  
East West ◽  
Vast Territory

Progress floristic classification of the vegetation of Russia is obvious (Mirkin, Ermakov, 2010; Mirkin, Naumova, 2011). However, in the vast territory of the country are still many «white spots», vegetation which syntaxonomically not been studied. One of these large «white spots» — the vegetation of the bogs. For years, the «monopolist» in ecologo-floristic classification of wetlands was V. A. Smagin (student major Soviet bolotoved M. S. Boch). He studied the vegetation of wetlands of the Northern regions of the European taiga and the basin of Myriagon Surgut Polesie (Smagin, 1998, 2000, 2003, etc.). Peer-reviewed monograph on the vegetation of mires in Western Siberia can be considered as a breakthrough in the syntaxonomy of this type of vegetation. Moreover, as a result of the work of E. D. Lapshina picture of syntaxonomy of bog vegetation has changed so much that one can speak about a kind of «syntaxa of the revolution».

Expansive Soil Treatment with Liquid Ionic Soil Stabilizer

2018 ◽  
Vol 2672 (52) ◽  
pp. 185-194 ◽  
Author(s):  
Shi He ◽  
Xinbao Yu ◽  
Aritra Banerjee ◽  
Anand J. Puppala
Keyword(s):  
Expansive Soils ◽  
Expansive Soil ◽  
Linear Shrinkage ◽  
Strength Properties ◽  
Morphological Variations ◽  
Subgrade Soils ◽  
Soil Stabilizer ◽  
Before And After ◽  
Test Soil ◽  
Shrinkage Behavior

Calcium-based stabilizers such as lime and cement control swell and shrinkage behavior and enhance strength properties for expansive soils through the formation of pozzolanic components. However, sulfate-bearing subgrade soils stabilized with calcium-based stabilizers might cause excessive swelling and shrinkage due to the formation of highly expansive minerals like ettringite and thaumasite. In this paper, one liquid ionic soil stabilizer (LISS) was evaluated as an alternative stabilizer used to control swelling and shrinkage behavior of expansive soils. A comprehensive laboratory experiment program including a linear shrinkage test, a one-dimensional swell test, and an unconfined compressive strength test, was designed and carried out on soils from Dallas, Texas before and after treatment. Three dosage levels of stabilizer and four different curing periods were investigated. Test results indicate that LISS is an effective stabilizing agent, which not only reduces swelling and soil plasticity but also increases soil strength. Furthermore, a similar type of LISS is utilized to treat the soil in Dallas via deep injection using a hydraulic pump. Field emission scanning electron microscopy results on the test soil showed that the stabilizing program is likely to work through clay flocculation and morphological variations in the clay particles.

scholarly journals EFFECT OF ORGANIC SOIL ON STRENGTH PROPERTIES OF COMPRESSED CEMENT-SOIL BLOCK

2017 ◽  
Vol 8 (1) ◽  
pp. 41-48
Author(s):  
M. S. Shirin ◽  
M. M. Ali ◽  
M. R. Hasan ◽  
Md. Saiful Islam
Keyword(s):  
Cement Content ◽  
Low Cost ◽  
Organic Soil ◽  
Strength Properties ◽  
Organic Content ◽  
Retail Price ◽  
Western Region ◽  
Soil Block ◽  
Compressive And Flexural Strengths ◽  
Cement Soil

Compressed cement-soil block is used as low cost building material. In the south-western region of Bangladesh, there is availability of organic soil which is in the formation of overlying layer. Moreover, sandy materials do not occur and are not found easily in Bangladesh. The scarcity of sandy materials has led to the increase of the retail price and subsequently to higher production cost. So organic soil materials have been used as filler directly to produce cement-soil block. In this study, the compressive and flexural strengths of cement-soil block of density 1448kg/m³ to 1611kg/m³ with specified ratio of cement content were investigated using prism specimens. The observed elapsed periods were 1, 3, 7, 14, 28, 56 and 112 days with the variation of organic contents of 2%, 5%, 10%, 20% and 40%. Preferable results on the 28th day indicated that the compressive strength and the flexural strength of cement-soil block with 20% organic content increased by 125% and 102% respectively. Moreover, the influence of density on the strength properties of cement-soil block was found to be higher than the age of the specimen.

SEM Study of Tension Wood Fiber Morphology and its Effect on Paper Properties

1977 ◽  
Vol 35 ◽  
pp. 308-309
Author(s):  
K. W. Robinson
Keyword(s):  
Tension Wood ◽  
Wood Fiber ◽  
Strength Properties ◽  
Fiber Morphology ◽  
Paper Properties ◽  
Pure Cellulose ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sem Study

Tension wood (TW) is an abnormal tissue of hardwood trees; although it has been isolated from most parts of the tree, it is frequently found on the upper side of branches and leaning stems. TW has been classically associated with geotropic alignment, but more recently it has been associated with fast growth. Paper made from TW is generally lower in strength properties. Consequently, the paper industries' growing dependence on fast growing, short- rotation trees will result in higher amounts of TW in the final product and a corresponding reduction in strength.Relatively few studies have dealt with the role of TW in the structure of paper. It was suggested that the lower strength properties of TW were due to a combination of factors, namely, its unique morphology, compression failures in the cell wall, and lower hemicellulose content. Central to the unique morphology of the TW fiber is the thick gelatinous layer (G-layer) composed almost entirely of pure cellulose.

Sign in / Sign up

Export Citation Format

Share Document