Influence of the Mechanical Activation of Fly Ash on Strength of Ground Concrete Based on Waste Production

2021 ◽  
Vol 25 (11) ◽  
pp. 36-41
Author(s):  
D.V. Bespolitov ◽  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Equilibrium Condition ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Waste Production ◽  
Direct Use ◽  
Silicon Oxygen ◽  
Physical And Mechanical Characteristics

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.

scholarly journals Evaluation of the benefits of utilization of fly ash as a material for road subgrade

2018 ◽  
Vol 239 ◽  
pp. 05016 ◽  
Author(s):  
Nikola Obradović
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Mechanical Characteristics ◽  
Thermal Power ◽  
Road Construction ◽  
High Plasticity ◽  
Traffic Level ◽  
High Plasticity Clay ◽  
Medium Plasticity Clay ◽  
Physical And Mechanical Characteristics

The assessment of potential effects of the application of fly ash in road construction was based on the results of tests of fly ash from two thermal power plants in Serbia and three characteristic soil types: the medium plasticity clay, silty-sandy clay and high plasticity clay. The physical and mechanical characteristics of the stabilization of the above three types of soils with different percentages of fly ash and stabilizers (cement/lime) were determined in the study, and pavement designs for three traffic levels, from 1,000 to 10,000 vehicles/day were developed. The savings that can be achieved by using fly ash are going up to 16.8% depending on the type of material in the subgrade and the level of traffic. The potential savings are higher if the subsoil has lower bearing capacity, and if the traffic level is higher.

Physical and mechanical characteristics of cement mortars and concretes with addition of clinoptilolite from Beli Plast deposit (Bulgaria), silica fume and fly ash

Clay Minerals ◽  
2011 ◽  
Vol 46 (2) ◽  
pp. 213-223 ◽  
Author(s):  
V. Lilkov ◽  
I. Rostovsky ◽  
O. Petrov
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Specific Pore Volume ◽  
Cement Mortars ◽  
Physical And Mechanical Characteristics

AbstractCement mortars and concretes incorporating clinoptilolite, silica fume and fly ash were investigated for changes in their physical and mechanical properties. It was found that additions of 10% clinoptilolite and 10% Pozzolite (1:1 mixture of silica fume and fly ash) were optimal for improvement of the quality of the hardened products, giving 8% and 13% increases in flexural and compressive strength respectively. The specific pore volume of the mortars incorporating zeolite decreased between the 28th and 180th day to levels below the values for the control composition due to the fact that clinoptilolite exhibits its pozzolanic activity later in the hydration. In these later stages, pores with radii below 500 nm increased at the expense of larger pores. The change in the pore-size distribution between the first and sixth months of hydration occurs mostly in the mortars with added zeolite.

EXPERIMENTAL STUDY OF THE EFFECT OF WATERPROOF MATERIAL ON WATER-THERMAL REGIME OF THE SOIL SAMPLE

2015 ◽  
Vol 5 (4) ◽  
pp. 53-58
Author(s):  
Tatiana Vladimirovna PERMITINA
Keyword(s):  
Experimental Study ◽  
Soil Sample ◽  
Active Layer ◽  
Thermal Regime ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
The Road ◽  
Far North ◽  
Temperature And Humidity ◽  
Physical And Mechanical Characteristics

This article deals with the problem of water and thermal regime of subgrade of the road in the far north. The measures to regulate water and thermal regime of soil of roadbed are described. An experimental study to evaluate the effect of the waterproof materials on the temperature and humidity regime of the road construction. The tasks, aimed at identifying patt erns of change in the physical and mechanical characteristics and the migration of moisture in the subgrade of the road and in the active layer of permafrost, reinforced waterproof element, are set.

Activity Improvement of Sticky Portland Cements by Methods of Mechanical Activation

2019 ◽  
Vol 945 ◽  
pp. 3-8 ◽  
Author(s):  
A.V. Andreeva ◽  
O.N. Burenina ◽  
M.E. Savvinova
Keyword(s):  
Mechanical Activation ◽  
Ball Mill ◽  
Granulometric Composition ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Surface Characteristics ◽  
Fine Grained ◽  
Wide Range ◽  
Grinding Machines ◽  
Physical And Mechanical Characteristics

The article presents experimental data on the improvement of physical and mechanical properties and structure of fine-grained concrete by mechanical activation of sticky cement in various apparatuses. It is established that the use of mechanoactivation technologies allows controlling the surface characteristics of cement in a wide range, its granulometric composition, as well as the physical and mechanical characteristics of concrete products. It is revealed that the efficiency of grinding machines that realize various mechanisms of disperse action is not the same. The highest indexes belong to the concrete containing cement, which is mechanically activated on the planetary ball mill AGO-2.

scholarly journals Supersulfated Cement Applied to Produce Lightweight Concrete

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 403
Author(s):  
Liliya Kazanskaya ◽  
Olga Smirnova ◽  
Ángel Palomo ◽  
Ignacio Menendez Pidal ◽  
Manuel Romana
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Specific Surface ◽  
Mechanical Characteristics ◽  
Lightweight Concrete ◽  
Resistance Increase ◽  
Coefficient Of Thermal Conductivity ◽  
Experimental Works ◽  
Strength In Bending ◽  
Physical And Mechanical Characteristics

The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

scholarly journals Protection of environment by the use of fly ash in road construction

2013 ◽  
Vol 10 (1) ◽  
pp. 108-113
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Mechanical Characteristics ◽  
Low Cost ◽  
Road Construction ◽  
Electrical Energy ◽  
The Other ◽  
Clay Soils ◽  
Forest Road ◽  
Great Availability

Fly ash is an important industrial by-product that comes from the combustion of coal, for the production of electrical energy. In our country, only a small percentage is used for the construction of technical projects, while the rest is stockpiled, causing serious problems. Because of its great availability and its low cost, further possibility of its usage should be investigated. In the present assignment, clay soils, natural and crushed sand-gravel were stabilized with different quantities of fly ash, for the creation of durable forest roads. From research, it has been found that stabilization with fly ash, improves the natural and mechanical characteristics of soils (plasticity, compressive strength and particle size distribution). As a result, the improvement of the forest road networks from one side and the economy in natural inert materials and the exploitation of fly ash from the other, the importance of such an intervention in the protection of the forest ecosystem and the natural environment in general are obvious.

scholarly journals Influtnce analysis of 09Г2С and 30MnB5 steels thermo cyclic treatment on strength characteristics of road construction machines working bodies

2021 ◽  
Vol 18 (2) ◽  
pp. 180-190
Author(s):  
A. P. Scherbakov ◽  
A. E. Pushkarev ◽  
T. V. Vinogradova
Keyword(s):  
Grain Size ◽  
Comparative Analysis ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Thermal Action ◽  
Graphical Form ◽  
Boron Steel ◽  
Construction Machinery ◽  
Cyclic Treatment ◽  
Physical And Mechanical Characteristics

Introduction. The ways of increasing the reliability of road construction machinery operation are considered. As a result, an option is proposed to replace the used 09Г2С steel with 30MnB5 boron steel. Using the example of a motor grader blade, the force effects on this working body of the road construction machinery are analyzed. In order to increase the level of physical and mechanical characteristics of 09Г2С and 30MnB5 steels, they are additionally exposed to thermo cyclic treatment. The experimental studies about the influence of this type thermal action on the structure and properties of steels are described. The comparative analysis of the obtained characteristics allows making a conclusion about the possibility of the considered replacement.Materials and methods. Through the metallographic analysis the influence of the number of thermal effects cycles on the grain size of steel is investigated. Alongside a set of physical and mechanical characteristics of these steels was determined at various stages of the thermo cyclic treatment.Results. It was determined that an increasing the level of physical and mechanical characteristics of the studied steels is possible through the use of thermo cyclic treatment. This is achieved by producing a fine-grained metal structure with a higher strength. The dependence of the tensile strength and yield strength of the steels under investigation on the number of cycles of thermal action is considered. Some correlation relationships were selected to describe these dependencies. The relationship between the yield stress and ultimate strength of 09Г2С and 30MnB5 steels and the grain size is considered. All investigated dependencies are presented in graphical form.Discussion and conclusion. Based on a comparative analysis of the complex of physical and mechanical characteristics, the conclusion about the possibility of replacing 09Г2С steel with 30MnB5 steel was made.

BENCH DESIGN AND STUDY OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF A TEAT CUP LINER WITH ANTIBACTERIAL FILLER

2020 ◽  
pp. 22-26
Author(s):  
YURY G. IVANOV ◽  
◽  
YELENA V. MASHOSHINA ◽  
LYUDMILA N. VERLIKOVA ◽  
DARIA G. GELETIY ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Physical And Mechanical Characteristics
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