scholarly journals Sulfur-Modified Composites for Enhancement of Building Foundations

2021 ◽  
Vol 247 ◽  
pp. 01053
Author(s):  
S.Y. Efremova ◽  
M.I. Panfilova ◽  
N.I. Zubrev ◽  
N.A. Politaeva ◽  
A.A Goryacheva
Keyword(s):  
Composite Materials ◽  
Strength Characteristics ◽  
Oil Refining ◽  
Construction Site ◽  
Sulfur Addition

This paper considers the issues of improving the strength characteristics of foundations by injecting specially selected composite mortars into soils. The properties of injection mortars used in seismic hazardous areas are improved using various additives consisting of various wastes. The article explores the possibility of using a composite mortar modified with sulfur, which is waste from oil refining. The influence of its addition on the strength characteristics of composite materials is studied. The optimal content of sulfur addition was determined, which makes it possible to increase the strength of building mixtures by 20-30%. The possibility to use a sulfur- modified composite mortar to strengthen an artificial foundation for reducing the seismicity of the construction site was proven.

STRUCTURING OF CURED POLYMERIC COMPOSITE MATERIALS IN A MICROWAVE ELECTROMAGNETIC FIELD

2021 ◽  
pp. 3-9
Author(s):  
I. V. Zlobina
Keyword(s):  
Electromagnetic Field ◽  
Composite Materials ◽  
Polymer Composite ◽  
Contact Interaction ◽  
Energy Systems ◽  
Polymeric Composite ◽  
Strength Characteristics ◽  
Polymer Composite Materials ◽  
Reinforcing Fibers ◽  
The Matrix

Based on studies of the microstructure of the matrix of cured polymer composite materials and the area of its contact interaction with reinforcing fibers, the hypothesis of its structuring in the microwave electromagnetic field with an increase in the contact interaction surfaces due to an increase in the number of agglomerates with small transverse dimensions and a decrease in porosity in the macro- and mesopore regions is substantiated. These effects can be used as a basis for increasing the strength characteristics and uniformity of their values after exposure to a microwave electromagnetic field. The results of this work can be used in the development of technologies for finishing hardening of products made of carbon and fiberglass for various transport and energy systems.

scholarly journals THE INFLUENCE OF QUALITY OF CUT SURFACE ON THE STRENGTH CHARACTERISTICS OF PARTS MADE OF COMPOSITE MATERIALS

2020 ◽  
pp. 5-12
Author(s):  
Andrei M. Markov ◽  
Vyacheslav N. Nekrasov ◽  
Mikhail V. Andreev ◽  
Sergei V. Gayst ◽  
Su Jian ◽  
...  
Keyword(s):  
Composite Materials ◽  
Strength Characteristics ◽  
Cut Surface

scholarly journals Strength Characteristics of Cement Treated and Expanded Polystyrene Mixed Lightweight of Waste Soil from the Construction Site of a Yangtze River Bridge in China

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Weihua Lu ◽  
Jianyun Wang ◽  
Yongxing Zhang
Keyword(s):  
Compressive Strength ◽  
Yangtze River ◽  
Raw Materials ◽  
Fine Sand ◽  
Expanded Polystyrene ◽  
Strength Characteristics ◽  
Construction Site ◽  
Exponential Relationship ◽  
Construction Waste ◽  
Waste Soil

In the past decades, the speed and scale of Chinese infrastructure construction have been enormous, and the resulting construction waste is also quite amazing, which has become a huge threat to environmental protection. If the pollution-free engineering utilization of the construction waste can be achieved at a low cost, it will undoubtedly be a great benefit for the country and the people. Therefore, a preliminary experimental study was conducted to investigate the strength characteristics of the cement treated and expanded polystyrene mixed lightweight. The waste soil (muddy clay and fine sand) as the main component of the lightweight mixture is taken from a foundation construction site of a Yangtze River Bridge which connects two eastern coastal cities, Zhenjiang and Yangzhou. With different mixture ratios and additives of the cement treated and expanded polystyrene mixed lightweight, a series of cubic samples were tested by the unconfined compressive strength test, and collections of standard cylinder samples prepared by hand were inspected by the conventional triaxial shear test. Then, a good exponential relationship between the uniaxial compressive strength and the cement mixing ration was founded, and a logarithmic relationship was captured between the compressive strength and curing time within a period of 28 days after the specimens were made. Samples made of different soil as raw materials have different strengths, but all of these specimens show a strain-hardening and stable behavior. Results show that the mechanical strength characteristics of the cement treated and expanded polystyrene mixed waste soil mainly depend on the proportions of lightweight mixture.

THE USE OF THERMOSETTING MATRICES FOR THE MANUFACTURE OF POLYMER COMPOSITE MATERIALS BY THE NON-AUTOCLAVE MOLDING METHODS

2021 ◽  
pp. 22-33
Author(s):  
A.I. Tkachuk ◽  
◽  
K.I. Donetsky ◽  
I.V. Terekhov ◽  
R.Yu. Karavaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Composite Materials ◽  
Polymer Composite ◽  
Operating Temperature ◽  
Strength Characteristics ◽  
Polymer Composite Materials ◽  
Glass Transition Temperatures ◽  
Epoxy Matrices ◽  
Molding Methods

In work, the rheological heat-resistant and elastic-strength characteristics of thermosetting systems developed at FSUE «VIAM» (epoxy matrices of grades VSE-20, VSE-30, VSE-33, bismaleimide grade VST-57 and cyan ester matrices of grades VST-1210 and VST-60) processed by non-autoclave technologies. These resins make it possible to obtain composite materials for structural purposes with an operating temperature from -60 to 250 °C by the methods of vacuum infusion, impregnation under pressure and film technology. The work also presents glass transition temperatures and mechanical properties of carbon and fiberglass plastics obtained on their basis.

MANUFACTURING TECHNOLOGIES OF POLYMER COMPOSITE MATERIALS ON THERMOPLASTICS (review)

2021 ◽  
pp. 78-86
Author(s):  
A.E. Sorokin ◽  
◽  
V.A. Sagomonova ◽  
A.P. Petrova ◽  
L.V. Solovyanchik ◽  
...  
Keyword(s):  
Composite Materials ◽  
Residual Stresses ◽  
Polymer Composite ◽  
Technological Process ◽  
Thermoplastic Composite ◽  
Strength Characteristics ◽  
Polymer Composite Materials ◽  
Complex Products ◽  
Thermoplastic Matrix ◽  
Manufacturing Technologies

Various technologies for the production of prepregs based on a thermoplastic matrix and composite materials based on them are considered. Their advantages over the technologies of manufacturing polymer composite materials based on a thermosetting matrix are presented. It is shown that the use of melt technology allows the production of fiberglass with the highest level of strength characteristics. An algorithm for estimating residual stresses in a thermoplastic composite to optimize the technological process of producing complex products is described.

Testing Carbon Composite Materials under Primary Oil Refining Conditions

2014 ◽  
Vol 50 (9-10) ◽  
pp. 614-617
Author(s):  
M. V. Davydkin ◽  
G. G. Zolotenin ◽  
D. Yu. Gabaidulin ◽  
O. V. Nemykina
Keyword(s):  
Composite Materials ◽  
Carbon Composite ◽  
Oil Refining ◽  
Carbon Composite Materials
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