Kinetics of change of the physical and mechanical properties of binders during curing

1987 ◽  
Vol 22 (6) ◽  
pp. 761-765
Author(s):  
S. G. Kulichikhin
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Kinetics Of

Influence of Nanosized Silica Component on Physical and Mechanical Properties of a Composite Gypsum Binder

2014 ◽  
Vol 584-586 ◽  
pp. 1756-1760 ◽  
Author(s):  
Elena Valerievna Voitovich ◽  
Alla Vasilievna Cherevatova ◽  
Igor Vladimirovich Zhernovsky ◽  
Hans Bertram Fischer ◽  
Valeria Valerievna Strokova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
System Analysis ◽  
Setting Time ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Fine Crystalline Structure ◽  
Size And Morphology ◽  
Kinetics Of ◽  
Reduced Water ◽  
Nanosized Silica

The work presents the results of development of the composite gypsum binder (GB) with nanostructured binder on the basis of silica component (NBC). Introduction of NBC changes the kinetics of hardening, as well as improves physical and mechanical properties of gypsum system. Analysis of the microstructure of the GB has demonstrated in the presence of the NB the size and morphology of crystals are changed, promoting the formation of fine-crystalline structure and increase the contact area between new formations, compared to NBC – free gypsum system. Experimental studies have shown that the mechanical properties of the composite gypsum application of NBC increased, reduced water absorption, density increases, and increases the setting time.

scholarly journals Modification of Thiol-Ene Ionogels with Octakis(methacryloxypropyl) Silsesquioxane

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 385
Author(s):  
Aneta Lewandowska ◽  
Piotr Gajewski ◽  
Katarzyna Szcześniak ◽  
Mariola Sadej ◽  
Piotr Patelski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Network Formation ◽  
Physical And Mechanical Properties ◽  
Imidazolium Ionic Liquid ◽  
Puncture Strength ◽  
Oligomeric Silsesquioxane ◽  
Conductive Properties ◽  
Kinetics Of

The effect of polyhedral oligomeric silsesquioxane (POSS) on the synthesis and properties of hybrid organic–inorganic ionogels was investigated using octakis(methacryloxypropyl) silsesquioxane (methacryl-POSS). Ionogels were prepared in situ by thiol-ene photopolymerization of triallyl isocyanurate with pentaerythritol tetrakis(3-mercaptopropionate) in a mixture of imidazolium ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMImNTf2) and propylene carbonate (PC). Investigations included the kinetics of hybrid materials formation and selected physical and mechanical properties. The disadvantage of ionogels without the methacryl-POSS modifier is leakage and insufficient mechanical properties. Modifying the thiol-ene matrix by the addition of methacryl-POSS made it possible to obtain non-leaking ionogels with improved mechanical and conductive properties. The steric hindrance of POSS cages and high-density network formation played important roles in ionogel synthesis: decrease of polymerization rate (with almost no effect on conversion), as well as dimensions of the formed polymer spheres during dispersion polymerization (highly cross-linked polymer has poorer solubility in polymerizing medium at a similar conversion, and nucleation begins at lower conversion), an increase of glass transition temperature and puncture strength. Hybrid ionogels with high ionic conductivity in the range of 4.0–5.1 mS∙cm−1 with the maximum parameter for 1.5 wt.% addition of the methacryl-POSS were obtained, which can be associated with ion-pair dissociations in ionic liquid clusters caused by methacryl-POSS.

scholarly journals Effect of complex flame retardant on physico-chemical properties of orthophthalic unsaturated resin

2020 ◽  
pp. 26-29
Author(s):  
Y. M. Yevtushenko ◽  
Y. A. Grigoriev ◽  
I. O. Kuchkina ◽  
E. V. Afoshina ◽  
G. A. Krushevsky
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Flame Retardant ◽  
Unsaturated Polyester ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Polyester Resins ◽  
Physico Chemical ◽  
Kinetics Of

A brief review of the results of studies on reducing the combustibility of composite materials based on unsaturated polyester resins is presented. A flame retardant orthophthalic unsaturated resin based on a complex flame retardant was developed and studied. It is shown that the category for resistance to burning of the resin is achieved with 15–20% filling of the complex flame retardant based on ammonium polyphosphate, melamine and pentaerythritol. The kinetics of curing and physical and mechanical properties of the composite material are evaluated.

scholarly journals SHOTCRETE IN MINE CONSTRUCTION

Vestnik MGSU ◽  
2017 ◽  
pp. 780-787 ◽  
Author(s):  
Vyacheslav Aleksandrovich Alekseev ◽  
Aleksey Igorevich Kharchenko ◽  
Vadim Gennad’evich Solovyev ◽  
Roman Nikolaevich Nikonorov
Keyword(s):  
Mechanical Properties ◽  
Performance Improvement ◽  
Experimental Analysis ◽  
Calculation Method ◽  
Physical And Mechanical Properties ◽  
Well Bore ◽  
Chemical Additives ◽  
Subsurface Structures ◽  
Fast Development ◽  
Kinetics Of

This article deals with concerns of construction of subsurface structures with the use of shotcrete as a support, the samples of mine construction with application of shotcrete have been shown, in particular projected mine with vertical well bore. The calculation method for construction of well bore with the use of shotcrete support has been stated, the major analytical relationships have been set out, a graph showing the growth of strength in a support has been generated for several sites according to the results of actual geotechnical survey. The research of properties of concrete with fast development of strength has been implemented for mine engineering and construction of transportation infrastructure. The results of experimental analysis of shotcrete with organo-mineral and chemical additives have been listed. Performance improvement of physical and mechanical properties of shotcrete has been proven when the complex active nano agent added into composition of the binder. Improved kinetics of development of strength related to accelerated admixture helps in proportioning concrete compositions for practically any firm and medium-firm grounds during construction of support of subsurface structures.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

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