scholarly journals FINE-GRAINED HIGH-STRENGTH CONCRETE

2020 ◽  
Vol 3 (1) ◽  
pp. 39-43 ◽  
Author(s):  
A. Tolstoy
Keyword(s):  
Structure Formation ◽  
Mineral Composition ◽  
Production Technology ◽  
High Strength Concrete ◽  
Raw Materials ◽  
Stable State ◽  
High Strength ◽  
Economic Feasibility ◽  
Strength Concrete ◽  
Fine Grained

the article discusses the possibilities of improving the strength characteristics of fine-grained concrete. Modification of compositions and production technology of fine-grained high-strength concrete is possible with the use of natural and man-made raw materials of various chemical and mineral composition. It is shown that it is possible to increase the economic feasibility of high-strength fine-grained concretes with the preservation of performance characteristics due to the use of man-made raw materials and production waste. The issues of controlling the processes of structure formation and identifying a potentially stable state of hardening compositions are considered, possibly on the basis of modification and design methods for the composition of construction objects with improved properties.

scholarly journals DEVELOPMENT OF COMPOSITIONS OF FILLED INSULATORS BASED ON SECONDARY RAW FOR MONOLITHIC HIGH-STRENGTH CONCRETE

2019 ◽  
Vol 46 (3) ◽  
pp. 129-138
Author(s):  
A. Kh. Alaskhanov ◽  
T. S. Murtazaeva ◽  
M. S.-A. Saidumov ◽  
A. O. Omarov
Keyword(s):  
Structure Formation ◽  
High Strength Concrete ◽  
Raw Materials ◽  
High Strength ◽  
Recycled Materials ◽  
Strength Concrete ◽  
Regulatory Documents ◽  
Concrete Mixtures ◽  
Technogenic Raw Materials ◽  
Mineral Fillers

Objectives Development of compositions filled with binders based on recycled materials for monolithic high-strength concrete.Method The research methods adopted in the work are based on the theoretical principles and laws of designing and optimizing polydisperse multicomponent systems, the phase and structure formation of clinker minerals, the logic of mathematical calculations, the technological features of the structure formation of composite masses, the theoretical principles of controlling the rheological processes of mixes. All experimental data presented in the work were obtained according to the methods of current regulatory documents (GOST, recommendations, etc.).Result The paper provides an analysis of the experience of using recycled materials in the form of products of demolition of buildings and structures, the technology for producing secondary raw materials for concrete on their basis. Formulations filled with binders with an activity of 60-71 MPa with finely dispersed mineral fillers from concrete scrap and brick combat with a ratio of 70:30%, respectively, were developed and investigated.Conclusion The optimal formulations of highly mobile concrete mixtures were designed using local natural and technogenic raw materials with a grade of P5 cone sediment and persistence for more than 8 hours to obtain high-strength classes of compressive strength up to B60-B80 with unique operational properties. 

scholarly journals Production of Greener High-Strength Concrete Using Russian Quartz Sandstone Mine Waste Aggregates

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5575
Author(s):  
Aleksandr Tolstoy ◽  
Valery Lesovik ◽  
Roman Fediuk ◽  
Mugahed Amran ◽  
Murali Gunasekaran ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
Raw Materials ◽  
Mine Waste ◽  
Natural Radionuclides ◽  
High Strength ◽  
Morphological Properties ◽  
Cement Matrix ◽  
Natural Activity ◽  
Strength Concrete ◽  
The Cost

Quartz sandstone (QS) is a mine waste; therefore, its use in construction allows for both reducing the cost of the concrete and contributing to the utilization of waste. The scientific originality of this study is the identification of models of the effect of QS aggregate on the physicomechanical, durability characteristics, and eco-safety of greener high-strength concrete. The study used an energy-efficient method of non-thermal effects of electromagnetic pulses on the destruction mechanisms of quartz-containing raw materials. The characteristics of quartzite sandstone aggregates, including the natural activity of radionuclides, were comprehensively studied. The features of concrete hardening, including the formation of an interfacial transition zone between the aggregate and the cement matrix, were studied, taking into account the chemical and morphological features of quartzite sandstone. In addition, the microstructural and morphological properties of concrete were determined after a 28 day curing. In this study, the behaviors of the concrete with QS aggregate were investigated, bearing in mind the provisions of geomimetics science on the affinity of structures. The results obtained showed that the QS aggregate had the activity of natural radionuclides 3–4 times lower compared to traditional aggregates. Efficient greener concrete with a 46.3 MPa compressive strength, water permeability grade W14, and freeze–thaw resistance of 300 cycles were also obtained, demonstrating that the performance of this greener concrete was comparable to that of traditional concrete with more expensive granite or gabbro diabase aggregates.

A NEW KIND OF CEMENT AS A SOLUTION TO THE ENVIRONMENTAL CHALLENGES OF MODERNITY

2021 ◽  
Author(s):  
G Kasimova
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Fresh Concrete ◽  
Raw Materials ◽  
Road Construction ◽  
High Strength ◽  
Strength Concrete ◽  
Cement Replacement ◽  
Air Content ◽  
Concrete Mix

The article presents studies on the production of high-strength concrete for road construction for a given 28-day strength on local raw materials. As a cement-replacement additive, fly ash was used. It was found out that the fresh concrete mixture had adequate workability, the air content of the concrete mix withthe sperplastifizer, the 28-day strength of the base mixture, which corresponded to the required strength.

A Comparative Study between Welding and High-Tensile Vertical Bolt Methods in PHC Pile Coupling Work

2014 ◽  
Vol 681 ◽  
pp. 183-186
Author(s):  
Yoon Seok Shin ◽  
Gwang Hee Kim
Keyword(s):  
Comparative Study ◽  
High Strength Concrete ◽  
High Strength ◽  
Economic Feasibility ◽  
Construction Sites ◽  
Strength Concrete ◽  
Welding Method ◽  
High Tension

Few studies have been conducted on the constructability or economic feasibility of the coupling of Pre-tensioned Spun High Strength Concrete (hereinafter PHC pile). For this reason, before applying it to actual construction sites, an analysis of constructability and economic feasibility is necessary. Therefore, this study aims to compare the welding method with the high-tension vertical bolt method. It is found that the use of the high-tension vertical bolt method can reduce expenses by 25 percent on average compared with the welding method.

Experimental Study on Rebound Curve of High-Strength Concrete

2021 ◽  
Vol 881 ◽  
pp. 137-141
Author(s):  
Cao Li ◽  
Wang Qing Gao
Keyword(s):  
High Strength Concrete ◽  
Raw Materials ◽  
Engineering Application ◽  
Basic Research ◽  
High Strength ◽  
Detection Accuracy ◽  
Concrete Technology ◽  
Strength Concrete ◽  
Strength Curve ◽  
Important Basis

As the application of high-strength concrete in civil engineering becomes more and more extensive in our country, it needs to cooperate with the popularization and application of new high-strength concrete technology so as to solve the practical problems of high-strength concrete in the engineering application of the strength detection and master the national strength measurement curve of high-strength concrete. A representative commercial concrete manufacturer in Guangzhou was selected for the detection accuracy of this area. And the general raw materials in Guangzhou were used to make concrete specimens. The 4.5J high-strength rebound tester and 5.5J high-strength rebound tester were used for testing the rebound value of the specimen and the compressive strength of the specimen at different ages. The basic research results can be used as an important basis for establishing the strength curve of high-strength concrete areas.

Fine-Grained High-Strength Concrete

2019 ◽  
Vol 945 ◽  
pp. 131-135 ◽  
Author(s):  
N.P. Lukutsova ◽  
G.N. Soboleva ◽  
S.N. Golovin ◽  
E.V. Chivikova ◽  
E.V. Ogloblina
Keyword(s):  
High Strength Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Ultrasonic Dispersion ◽  
Positive Role ◽  
Strength Concrete ◽  
Fine Grained ◽  
Mineral Components ◽  
Surface Active

The factors determining the production of fine-grained high-strength concrete are considered. The effect of micro-and complex nanodisperse additives based on natural mineral components, as well as the packing density of the quartz aggregate, on the strength parameters of fine-grained concrete is studied. The compositions of the fine-grained concrete modified by micro-and complex nanodisperse additives have been developed. The dependence of the fine concrete strength on the ratio of the mineral component and the stabilizer in the nanodisperse additive and the time of ultrasonic dispersion and additive storage is analyzed. The stabilization mechanisms of water dispersions of complex nanodisperse additives by various surface active modifiers are considered. The positive role of ultrasonic dispersion in obtaining nanodispersed additives is shown. The application efficiency of the micro-filler improving the density and strength of fine-grained concrete is revealed. The structure of fine-grained concrete is studied. It has been established by scanning electron microscopy that the introduction of the micro-and nanodispersed additives in the concrete leads to a less defective crystalline structure of the material.

scholarly journals HIGH STRENGTH CONCRETE FOR LEGO-BLOCKS

2021 ◽  
Vol 6 (5) ◽  
pp. 8-18
Author(s):  
V. Lesovik ◽  
M. Elistratkin ◽  
A. Sal'nikova
Keyword(s):  
High Strength Concrete ◽  
Basalt Fiber ◽  
High Strength ◽  
Maximum Efficiency ◽  
Cement Stone ◽  
Composite Binder ◽  
Positioning Systems ◽  
Strength Concrete ◽  
Fine Grained ◽  
Thin Walled

Lego technology is one of the modern construction solutions providing cost reduction, increasing architectural expressiveness and the pace of work. This is the development of groove-ridge positioning systems and connection of small-piece wall elements. Currently, the technology of Lego blocks is implemented on various types of building materials: ceramic and hyper-pressed non-fired bricks, blocks from various types of lightweight concrete, which have not found wide practical application due to an obvious shift in the balance of properties either towards aesthetics – brick, or thermal insulation - blocks. In this regard, a technology for producing multi-hollow thin-walled lego blocks based on self-compacting high-strength fine-grained concrete with various types of high-porous filling is proposed. In this paper, the compositions of high-strength concrete mixes for the manufacture of lego block frames are proposed. The main emphasis in the development is made on improving the manufacturability of their production and the maximum efficiency of using the clinker component. Overcoming the multicomponent problem is achieved by replacing traditional cement with a special all-in-one composite binder. Due to the unacceptability of traditional methods of dispersed reinforcement for producing thin-walled products from self-compacting fine-grained mixtures, it is proposed to carry out dispersed micro-reinforcement at the level of cement stone, for which a technology is developed and the optimal parameters of dispersion of glass and basalt fiber are determined. Thanks to this approach, reinforcing fibers are included in the composition of the composite binder itself, which ensures maximum manufacturability and an increase in compressive strength up to 20...25 %.

METHOD FOR CONSTRUCTION OF ISOCHRONDIAGRAMS OF HIGH-STRENGTH STEEL FIBER CONCRETE AND ITS MATRIX

2020 ◽  
Vol 91 (5) ◽  
pp. 32-45
Author(s):  
G.A. MOISEENKO ◽  
Keyword(s):  
High Strength Steel ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Good Convergence ◽  
Strength Concrete ◽  
Fine Grained ◽  
Modern Engineering ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

High-strength steel fiber concrete, made on the basis of fine-grained high-strength concrete, is a quite promising building material, in particular, for the construction of high-rise buildings and structures of increased massiveness. The introduction of steel fiber into the concrete matrix can significantly reduce the influence of such shortcomings of fine-grained concrete as increased fragility and explosive nature of fracture, and also positively affects the tensile properties of concrete. However, the widespread use of high-strength steel fiber concrete is currently limited, among other things, by the lack of an experimentally relied normative framework for this material. The proposed article aims to bridge this gap. Modern engineering trends are aimed at introducing into practice diagram methods of calculation based on real diagrams of material deformation under load. This article describes the technique of constructing isochron diagrams for fine-grained high-strength concrete and steel fiber concrete with disperse reinforcement in the amount of 1.5% by weight, made from Russian-made components. Isochron diagrams allow you to calculate the deformation of the material depending on the level of load at any time, including during prolonged loading. There have been made changes to the existing methodology, allowing to take into account the nonlinearity of both current and ultimate creep characteristics depending on the level of loading. The proposed theoretical dependences give good convergence with the experimental data.

scholarly journals Optimum Sustainable Mix Proportions of High Strength Concrete by Using Taguchi Method

2020 ◽  
Vol 14 (54) ◽  
pp. 211-225
Author(s):  
M.A. Warda ◽  
H.S. Khalil ◽  
Seleem Ahmad ◽  
I.M. Mahdi
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Design Methodology ◽  
Steel Fiber ◽  
Raw Materials ◽  
Aggregate Size ◽  
High Strength ◽  
Maximum Aggregate Size ◽  
Strength Concrete ◽  
Technical Requirements

In this study, mix proportion parameters of high strength concrete (HSC) were analyzed by using the Taguchi’s experiment design methodology for optimal design. For that purpose, mixtures are designed in a L27 orthogonal array with six factors, namely, ‘Silica Fume’, ‘Steel Fiber’, ‘Super-Plasticizer’, ‘Maximum Aggregate Size (AG)’, ‘Water / cementitious material (W/C) ratio’, ‘Fly Ash’. The mixtures were extensively tested to meet technical requirements of HSC. The experimental results were analyzed by using the Taguchi experimental design methodology. The best possible levels for mix proportions were determined for maximization of compressive strength at 7, 28, 56, 90 days, splitting tensile strength at 28 days, flexural strength at 28 days, and the slump. Also the best possible levels for mix proportions were determined for minimization of the production cost. It was found that steel fibers and fly ash are the most dominant factors in the process of optimization. The advantage of using steel fiber and fly ash was the reduced energy and cost associated with the raw materials which meant more sustainable concrete could be attained. It was also found that there is a necessity to apply a multi- response optimization to get the best mix proportions.

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