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

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.

Impact of Superplasticizing Agents on Physical and Mechanical Properties of Cellular Concrete

2019 ◽  
Vol 974 ◽  
pp. 181-186
Author(s):  
V.A. Perfilov ◽  
V.V. Gabova ◽  
Inessa A. Tomareva
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
Pore Space ◽  
Experimental Studies ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Foam Concrete ◽  
Cellular Concrete

The effect of superplasticizing, foam agents, various fiber aggregates on the physical and mechanical properties of cellular concrete has been studied. The article covers the results of experimental studies conducted to determine the effect of foam agents PO-6 and PB-2000, as well as polymeric and basalt fiber on the pore structure of foam concrete. The dependence between the change in density and strength of cellular concrete and the structure of its pore space has been determined.

scholarly journals SYNTHESIS OF STRUCTURES OF CELLULAR-CONCRETE COMPOSITES WITH NANOSIZED COMPONENTS

Vestnik MGSU ◽  
2017 ◽  
pp. 733-740
Author(s):  
Valentina Anatol'yevna Solonina ◽  
Galina Alexandrovna Zimakova ◽  
Dmitriy Sergeevich Baianov ◽  
Pavel Valer'evich Sharko ◽  
Marina Petrovna Zelig
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Pore Structure ◽  
Physical And Mechanical Properties ◽  
Structure And Properties ◽  
Integrated Research ◽  
High Calcium ◽  
Nanopore Structure ◽  
Matrix Stone ◽  
Cellular Concrete

The article reveals the results of one of the stages of the integrated research studying the influence of compounds and disperse characteristics of silica-containing materials on structure formation and qualities of cellular concrete. It has been indicated that the improvement of physical and mechanical properties of cellular concrete can be achieved through creating the best possible pore structure of the concrete and the structure of interporous frame as well as intensification of hydration and crystallization processes under hydrothermal treatment and, as a result, the increase in number and perfecting morphology of hydrated phases. Up-to-date knowledge about the structure and properties of cellular concrete shows potential capacities to enlarge strength characteristics through forming a nanopore structure of a matrix stone, the effective usage of power potential of multicomponent binding including Portland cement, high-calcium lime, activate silica components with grains of submicron and nanometer range.

scholarly journals Enhanced Physical and Mechanical Properties of Flake–Shape/Vinyl-ester Nanocomposites Through Surface Modification of Graphene and Glass Flake: A Comparison with Simulated Data

2020 ◽  
Vol 11 (4) ◽  
pp. 11316-11337
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Flexural Strength ◽  
Water Absorption ◽  
Storage Modulus ◽  
Vinyl Ester ◽  
Graphene Nanosheets ◽  
Analytical Data ◽  
Physical And Mechanical Properties ◽  
And Storage

: The main goal of this work was to investigate the effects of silane-modified graphene nanosheets (MGNS) and modified nanoglass flakes (MNGF) on the physical and mechanical properties of vinyl-ester resin (VER) composites. The surface modification was evaluated about these composites' physical and mechanical behavior by techniques such as water absorption, tensile, three-point bending, and dynamic mechanical thermal analysis (DMTA). The analytical data revealed that the silane functionalized nanocomposites improved the interface between the nanosheets and vinyl-ester matrix. It was found that surface modification could significantly improve the dispersion and adhesion of GNS and nanoglass flakes (NGF) compared with those of neat vinyl-ester and unmodified composites. The presence functionalization of NGF and graphene nanosheets (GNS) in vinyl-ester formulation did affect the tensile and flexural strength and modulus, water absorption, and storage modulus. GNS/VER exhibited higher tensile and flexural strength and modulus than the original composite. DMTA results also showed incorporation of NGF and GNS decreased glass transition and increased storage modulus relative to neat composites. Nonetheless, the incorporation of functionalized graphene nanosheets and nano glass flakes represent higher Tg and storage modulus.

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 Optimization of Cellular Concrete Formulation with Aluminum Waste and Mineral Additions

2021 ◽  
Vol 7 (7) ◽  
pp. 1222-1234
Author(s):  
Mohammed Salah Bouglada ◽  
Noui Ammar ◽  
Belagraa Larbi
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Sand Dunes ◽  
Physical And Mechanical Properties ◽  
Experimental Program ◽  
Mechanical Resistance ◽  
Dune Sand ◽  
Mineral Additions ◽  
Cellular Concrete

The paper aims to study cellular concrete with a new approach of formulation without an autoclave, with the use of aluminum waste and incorporation of mineral additions into the sand and evaluate its physical and mechanical properties. In this experimental study, two types of cellular concrete are prepared, based on crushed and dune sand with the incorporation of 15% of the slag and 10% of pozzolana, as sand replacement. An experimental program was performed to determine the compressive strength at 28 days, the density and thermal conductivity of the confected cellular concrete. The obtained results showed that concretes prepared with crushed sand developed better mechanical resistance compared to the dune sand. It is also noted that the concretes containing the mineral additions provide a substantial increase in compressive strength in particular slag. Furthermore, cellular concretes with sand dunes offer better thermal conductivity, compared to those with crushed sand. The use of the additions reduces the Water/Binder (W/B) ratio and leads to a lower thermal conductivity regardless of the used sand nature. The outcome of the present study here in could present a modest contribution for the production of cellular concrete with local materials in particular dune sand, active mineral addition and aluminum waste. The physical and mechanical properties obtained from this new composition are estimated acceptable compared to those of the industry-prepared cellular concrete product. Doi: 10.28991/cej-2021-03091721 Full Text: PDF

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 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.

FEATURES OF TECHNOLOGY FOR PRODUCING CONSTRUCTIONAL HEAT INSULATING CELLULAR CONCRETE BASED ON NONCONVENTIONAL RAW MATERIALS

2016 ◽  
Vol 2 (1) ◽  
pp. 138-143 ◽  
Author(s):  
Строкова ◽  
Valeriya Strokova ◽  
Володченко ◽  
Anatoliy Volodchenko
Keyword(s):  
Mechanical Properties ◽  
High Activity ◽  
Energy Production ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Production Costs ◽  
Raw Material ◽  
Porous Concrete ◽  
Clay Rocks ◽  
Cellular Concrete

It was found that the clay rocks unfinished stage mineral suitable as a raw material for thermal insulation materials construction-autoclaved. High activity of raw rock-forming minerals accelerate the synthesis of tumors and the formation of a rational connection cementitious microstructure that provides high physical and mechanical properties of porous concrete. At the same time by reducing the pressure and time of autoclaving and simplify technology possible reduction of energy production costs by 35%.

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