scholarly journals About analytical description of the creeping deformations development for elements from soil cement composite taking into account compressive stresses level

2021 ◽  
Vol 74 (2) ◽  
pp. 67-75
Author(s):  
K.A. Karapetyan ◽  
S.G. Hayroyan ◽  
E.S. Manukyan
Keyword(s):  
Analytical Description ◽  
Cement Composite ◽  
Compressive Stresses ◽  
Soil Cement

scholarly journals Preliminary results of dry Deep Soil Mixing soil-cement composite testing

2018 ◽  
Vol 251 ◽  
pp. 01025 ◽  
Author(s):  
Klaudia Jendrysik ◽  
Monika Kiecana ◽  
Hubert Szabowicz
Keyword(s):  
Modulus Of Elasticity ◽  
Testing Machine ◽  
Cement Composite ◽  
Soil Condition ◽  
Strength Properties ◽  
Organic Content ◽  
Deep Soil ◽  
Soil Mixing ◽  
Soil Cement ◽  
Cement Binder

This paper provides results of testing made for soil-cement mixtures in dry mixing technology. This technology is greatly dependent on existing soil condition; hence the results are of highly random nature. Material used in testing was distinguished with high organic content and low humidity. Tests were carried out in laboratory of Wroclaw University of Technology on 145 samples as ordered by Menard Polska Ltd. Company. Samples were prepared and stored under laboratory conditions and then, after various maturation time, were destroyed in a testing machine. The purpose was to determine the stress-strain curves used to find strength properties, strain at failure, modulus of elasticity, secondary modulus of elasticity versus cement content. Test confirmed improvement of soil strength properties after addition of cement binder. The results may be used to determine the most economic binder-to-soil ratio.

scholarly journals COMPRESSION CHARACTERISTIC OF THIN STEEL PIPE-SOIL CEMENT COMPOSITE STRUCTURE AND ITS MODELING

2005 ◽  
pp. 103-118 ◽  
Author(s):  
Masahito IMAI ◽  
Fusao OKA ◽  
Shinichirou NAKASHIMA ◽  
Feng ZHANG
Keyword(s):  
Composite Structure ◽  
Cement Composite ◽  
Steel Pipe ◽  
Soil Cement ◽  
Thin Steel

scholarly journals The Dependence of Durability and Deformation of Elements of Soil Cement Composite with Carbonate White Soil Mixture on Age

2021 ◽  
Vol 1 (2) ◽  
pp. 32-39
Author(s):  
Koruyn Ashot Karapetyan ◽  
Sargis Hrachik Hairoyan ◽  
Eghishe Samvel Manukyan
Keyword(s):  
Experimental Study ◽  
Strain State ◽  
Lightweight Concrete ◽  
Cement Composite ◽  
Clay Soils ◽  
Short Term ◽  
Soil Mixture ◽  
Soil Cement ◽  
Carbonate Composition ◽  
Current Standards

The results of an experimental study of changes in strength and deformability during the period of time subjected to short-term loading of elements made of a soil-cement composite based on white soil (belozems) of carbonate composition are discussed. Research was carried out in accordance with current standards, as well as a well-known method that has been repeatedly tested earlier. To assess the experimentally established data, the results of similar studies by other authors, carried out applying elements from soil-cement based on clay soils, as well as from lightweight concrete on lithoid pumice (volcanic rock), are also presented. On the basis of the comparative analyzes of the experimentally established data, conclusions are formulated. The consideration of those may be useful both for the estimation of optimal schedules of the construction of buildings from a soil-cement composite, and for the assessment of their stress-strain state.

scholarly journals Effect of Recycled Polyethylene Terephthalate Strips on the Mechanical Properties of Cement-Treated Lateritic Sandy Soil

2020 ◽  
Vol 12 (23) ◽  
pp. 9801
Author(s):  
Maitê Rocha Silveira ◽  
Paulo César Lodi ◽  
Natália de Souza Correia ◽  
Roger Augusto Rodrigues ◽  
Heraldo Luiz Giacheti
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Terephthalate ◽  
Sandy Soil ◽  
High Strength ◽  
Cement Composite ◽  
Natural Soil ◽  
Direct Shear Tests ◽  
Soil Cement ◽  
Recycled Polyethylene ◽  
Ductile Behavior

The civil engineering construction industry is nowadays one of the largest consumers of natural resources. Therefore, the proposal of using alternative materials that seek to reduce waste production or the use of previously generated waste is becoming increasingly necessary. This paper evaluated the effect of recycled polyethylene terephthalate (PET) strips on the mechanical properties of a cement-treated lateritic sandy soil. Unconfined compression strength (UCS) tests were conducted in natural and PET strips mixtures in different strips lengths and contents. In addition to UCS tests, compaction tests were also conducted in order to analyze the effect of these inclusions on the properties of a lateritic sandy soil. Lastly, direct shear tests were conducted on natural soil-strip, soil-cement, and soil-cement-strip composites using optimum UCS results. The addition of strips to the soil-cement composite showed an increase in the soil cohesion parameter. The inclusion of strips also provided a more ductile behavior to the soil, presenting greater deformations with fewer stress peaks. Results showed that the recycled strips’ inclusion in soil-cement can provide a material with high strength, ductility, and a highly sustainable alternative.

Quantitative Analysis Of X-Ray Images From Geological Materials

1990 ◽  
Vol 48 (2) ◽  
pp. 244-245
Author(s):  
J. M. Paque ◽  
R. Browning ◽  
P. L. King ◽  
P. Pianetta
Keyword(s):  
Quantitative Analysis ◽  
Bulk Composition ◽  
Principal Component ◽  
Analytical Description ◽  
Bulk Sample ◽  
Geological Samples ◽  
X Ray ◽  
Software And Hardware ◽  
And Storage ◽  
Insight Into

Geological samples typically contain many minerals (phases) with multiple element compositions. A complete analytical description should give the number of phases present, the volume occupied by each phase in the bulk sample, the average and range of composition of each phase, and the bulk composition of the sample. A practical approach to providing such a complete description is from quantitative analysis of multi-elemental x-ray images.With the advances in recent years in the speed and storage capabilities of laboratory computers, large quantities of data can be efficiently manipulated. Commercial software and hardware presently available allow simultaneous collection of multiple x-ray images from a sample (up to 16 for the Kevex Delta system). Thus, high resolution x-ray images of the majority of the detectable elements in a sample can be collected. The use of statistical techniques, including principal component analysis (PCA), can provide insight into mineral phase composition and the distribution of minerals within a sample.

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

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