Study and Application of Salt-Scaling Resistant Admixture in Concrete

2009 ◽  
Vol 405-406 ◽  
pp. 361-366
Author(s):  
Yuan Wang ◽  
Da Li Zhang ◽  
Cui Hong Chen
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Practical Application ◽  
Deicing Salt ◽  
Salt Scaling ◽  
New Type

This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.

Study and Application of Salt-Scaling Resistant Admixture in Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 105-110 ◽  
Author(s):  
Yuan Wang ◽  
Bin Liu
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Practical Application ◽  
Deicing Salt ◽  
Salt Scaling ◽  
New Type

This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.

scholarly journals Reducing of Energy Consumption by Improving the Reclaiming Technology in Autoclave of a Rubber Wastes

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1460 ◽  
Author(s):  
Dan Dobrotă ◽  
Gabriela Dobrotă
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Refining Process ◽  
It Use ◽  
Rubber Waste ◽  
New Type ◽  
High Energy Consumption

The devulcanization of the rubber wastes in autoclave represent a technological variant that allows the superior utilization of rubber wastes, but with high energy consumption. The researches aimed at improving the devulcanization technology in order to obtain reclaimed rubber with superior characteristics, but also with a reduction in energy consumption. An improvement to devulcanization technology consisted in vacuuming the autoclave at the end of the devulcanization process. An increase in the degree of devulcanization of the rubber from 86.83% to 93.81% and an improvement of the physico-mechanical characteristics of the reclaimed rubber was achieved by applying this technology. The realization of the new type of regenerated rubber allowed for an increase in the degree of it use for different mixtures, from 15–20 phr to 30–40 phr without substantially affecting the physical and mechanical properties of the products. Additionally, the researche has shown that, by obtaining the new type of reclaimed rubber, the duration of the refining process has been reduced by 30%. All of this leads to a considerable reduction in energy consumption and transformation of the rubber waste reclaiming process into a sustainable one.

Structural Design and Experimental Study of a New Vacuum Vulcanizing Machine

2013 ◽  
Vol 427-429 ◽  
pp. 166-169
Author(s):  
Cai Jun Liu ◽  
Xu Juan Wang ◽  
Xu Wei
Keyword(s):  
Mechanical Properties ◽  
Structural Design ◽  
Production Efficiency ◽  
Physical And Mechanical Properties ◽  
Structure Characteristics ◽  
High Production Efficiency ◽  
New Type ◽  
High Production ◽  
High Degree ◽  
Machine Structure

This paper introduces a new type vacuum vulcanizing machine structure characteristics, the machine can realize the automatic mold, mold release, flip, ejector, has a high degree of automation, high precision products, high production efficiency; and to study the model of vacuumizing plate vulcanizing machine and physical and mechanical properties of ordinary vulcanization machine the influence of the vulcanizate by experiment.

scholarly journals DETERMINATION OF CONCRETE PROPERTIES DURING THE ASSESSMENT OF THE CONDITION OF FLAT REINFORCED CONCRETE STRUCTURES

2021 ◽  
pp. 80-87
Author(s):  
V. KOLOKHOV ◽  
V. VOLKOVA ◽  
L. MOROZ ◽  
S. BOGDAN
Keyword(s):  
Mechanical Properties ◽  
Concrete Structure ◽  
Concrete Strength ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Core Samples ◽  
Reliable Assessment ◽  
Normalized Parameters ◽  
Non Destructive

 Formulation of the problem. Operation of buildings and structures is based on periodic assessment of the condition of structures. The procedure for determining the strength of concrete by non-destructive methods requires a certain preparation of the concrete surface of the structure and sampling in order to calibrate the devices. During sampling, the samples may be damaged, in addition the surface of the cylinders does not meet the requirements for normalized test conditions. Part of the cores during selection is being destroyed, which reduces the representativeness of the results of determining the physical and mechanical properties of concrete. The purpose of the article is to find out the possibilities to increase the reliability of determining the physical and mechanical properties of concrete. Results. In the conditions of a real object, core samples were taken to study the concrete strength of the damaged area. Samples that did not meet the normalized parameters were prepared for testing using a repair mixture Mapegrout Thixotropic. Testing of the recovered core samples showed that the repair mixture adhered well to the surface of the core. The nature of the destruction in the restored and normalized samples is similar. Conclusions. Studies have shown that: the application of the existing method of determining the strength of concrete for slab structures limits the possibility of using core samples taken from structures; the use of Mapegrout Thixotropic repair mixture allows to carry out tests according to the normative method of damaged concrete samples or samples rejected due to size mismatch; reliable assessment of the deformable properties of concrete cores in many cases is impossible; the existing methodology needs to be improved or replaced by an alternative one; quantitative assessment of the rheological properties of the concrete mixture used for the manufacture of concrete structure is possible on the basis of comparing the deformable and strength characteristics of concrete structure, which requires formalization of the procedure and standardization.

scholarly journals Casting Routes for Porous Metals Production

2012 ◽  
Vol 12 (1) ◽  
pp. 71-74 ◽  
Author(s):  
P. Lichy ◽  
V. Bednarova ◽  
T. Elbel
Keyword(s):  
Mechanical Properties ◽  
Specific Surface ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Metal Foams ◽  
Process Conditions ◽  
Metallic Foams ◽  
Porous Metals ◽  
New Type ◽  
Metals Production

Casting Routes for Porous Metals Production The last decade has seen growing interest in professional public about applications of porous metallic materials. Porous metals represent a new type of materials with low densities, large specific surface, and novel physical and mechanical properties, characterized by low density and large specific surface. They are very suitable for specific applications due to good combination of physical and mechanical properties such as high specific strength and high energy absorption capability. Since the discovery of metal foams have been developed many methods and techniques of production in liquid, solid and gas phases. Condition for the use of metal foams - advanced materials with unique usability features, are inexpensive ways to manage their production. Mastering of production of metallic foams with defined structure and properties using gravity casting into sand or metallic foundry moulds will contribute to an expansion of the assortment produced in foundries by completely new type of material, which has unique service properties thanks to its structure, and which fulfils the current demanding ecological requirements. The aim of research conducted at the department of metallurgy and foundry of VSB-Technical University Ostrava is to verify the possibilities of production of metallic foams by conventional foundry processes, to study the process conditions and physical and mechanical properties of metal foam produced. Two procedures are used to create porous metal structures: Infiltration of liquid metal into the mold cavity filled with precursors or preforms and two stage investment casting.

scholarly journals The influence of cellular concrete surface modification on its physical and mechanical properties

2014 ◽  
Vol 2 (11(68)) ◽  
pp. 34
Author(s):  
Олександр Юрійович Лобанов ◽  
Валентин Анатолійович Свідерський
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Cellular Concrete

scholarly journals Influence of Biodegradable Release Oils on the Physical and Mechanical Properties of Light-Colored Architectural Concrete

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4630
Author(s):  
Danuta Barnat-Hunek ◽  
Małgorzata Szafraniec
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Edible Oil ◽  
Vapor Permeability ◽  
Permeability Test ◽  
New Agents ◽  
Water Based ◽  
Glyceryl Trioleate

In the article, unique formulations of biodegradable, non-toxic, edible oil-based release oils were developed and tested on architectural concrete. The produced agents have physicochemical properties similar to diesel fuel, but at the same time, are renewable and biodegradable products. An ultrasound was used to properly combine the liquid phase of edible oil and the liquid phase of glyceryl trioleate and/or water. Based on the PN-B-19305 standard, seven-component configurations were designed and then tested. The wettability of the concrete was determined by contact angle (CA) analysis. After the application of the formulations produced, the architectural concrete still had good wettability. The vapor permeability test showed that the tested release agents did not inhibit water vapor diffusion from the tested samples. The O65G35 (65% unique edible oil formula and 35% glyceryl trioleate) concrete had the best absorption. In this case, the CA was 56° after oil application and 46° before. The new agents did not impair the adhesion of the plaster to concrete. The O90W10 concrete showed the best adhesion of plasters made with it—51.9 kN/m2. The study also showed that the concrete surface had excellent paint absorption despite the use of release agents. The architectural concrete was evenly covered with paint without any problem. There were no difficulties in applying it, e.g., greasy places preventing the concrete from being coated with emulsion. The suitability of the produced release oils for lightweight architectural concrete structures intended for facades was confirmed. The best results were obtained after using formulations O65T35 and O90W10.

Preparation and Damping Properties of Cups-Stacked Carbon Nanotubes(CSCNTs)/Prime 20

2012 ◽  
Vol 557-559 ◽  
pp. 493-496
Author(s):  
Yan Liu ◽  
Rui Feng Li ◽  
Hua Xin Peng ◽  
Zhi Wu Han
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Physical And Mechanical Properties ◽  
Resin System ◽  
Damping Properties ◽  
Mechanical Mixing ◽  
Epoxy Resin System ◽  
Two Component ◽  
New Type ◽  
Scanning Electron

CSCNT is a new type carbon nanotube, which has better physical and mechanical properties than the traditional materials. In this study, the effect of the dispersion and concentration of cup-stacked carbon nanotubes on mechanical properties of the CSCNTs/epoxy nanocomposites were investigated. The epoxy resin system used in this study was a two component (resin and harder) Prime 20. The CSCNTs were dispersed into the Prime 20 by ultrasonic agitation and mechanical mixing together. And the morphologies of the fracture surface of CSCNTs/Prime 20 nanocomposites were observed by scanning electron microscope (SEM); damping behaviors of the nanocomposites were studied by DMA at frequency domain.

scholarly journals ORGANO-INORGANIC BINDERS FOR REPAIR AND RESTORATION OF TOWER TYPE HISTORY AND CULTURE MONUMENTS

2021 ◽  
Author(s):  
С.Г. Шеина ◽  
Д. К-С. Батаев ◽  
С-А. Ю. Муртазаев ◽  
П.Д. Батаева
Keyword(s):  
Mechanical Properties ◽  
Cultural Heritage ◽  
Physical And Mechanical Properties ◽  
Close Similarity ◽  
Practical Application ◽  
The Republic ◽  
Cultural Heritage Objects ◽  
Cultural Monuments

В статье делается обзор разработанных органо-неорганических составов растворов каменной кладки стен старинных башенных и некропольных строений Чеченской Республики и Республики Ингушетия. Отмечена перспективность практического применения органо-неорганических вяжущих для ремонта и реставрации памятников истории и культуры, благодаря близкому сходству разработанных составов «материнскому», за счет чего они более эффективны и способствуют повышению качества и долговечности. Исходя из анализа физико-механических свойств раствора для каменной кладки стен объектов культурного наследия рекомендованы три состава. The article provides an overview of the developed organic-inorganic compositions of masonry solutions for the walls of ancient tower and necropolis structures of the Chechen Republic and the Republic of Ingushetia. The prospects of the practical application of organic-inorganic binders for the repair and restoration of historical and cultural monuments are noted, due to the close similarity of the developed compositions to the "mother", due to which they are more effective and contribute to improving the quality and durability. Based on the analysis of the physical and mechanical properties of the mortar for the masonry of the walls of cultural heritage objects, three compositions are recommended.

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