scholarly journals Conceptual Approaches to Solving the Issue of Reinforcing the Rock - Cut Structures of Geghard Monastery Complex

2021 ◽  
Vol 1 (2) ◽  
pp. 3-9
Author(s):  
† Artavazd Avetik Arzumanyan ◽  
Avetik Artavazd Arzumanyan ◽  
Hasmik Hamle Qaramyan ◽  
Nelli Gagik Muradyan
Keyword(s):  
Mechanical Characteristics ◽  
Technical Condition ◽  
Laboratory Studies ◽  
Underground Structures ◽  
Rock Samples ◽  
Sandstone Rock ◽  
Comprehensive Development ◽  
Strength And Deformation ◽  
Physical And Mechanical Characteristics

The article presents a visual and instrumental research of the technical condition of the main rock-cut structures and their masonry additions, the documentation of their damages (cracks, crevices, destructions and erosions) and deformations, thorough complete laboratory studies of rock samples and their physical and mechanical characteristics, conceptual approaches to preventive and reinforcing measures necessary for the further safe survival of structures, as well as the comprehensive development and implementation of measures to prevent further damages (elimination of causes) and ensure the long-term existence of structures. Based on the analyses carried out, it is recommended to use a ready-made dry mixture mortar of the “Mapegrout'' brand produced by the Italian company “Mapei” to fill cracks if necessary. It is available in the market of the country and is successfully used in the reconstruction of tunnels and other underground structures. The issues of compatibility of reinforcing materials with sandstone rock are also considered on the basis of some averaged data of the main decisive physical and mechanical characteristics of the strength and deformation of sandstone.

scholarly journals Does long-term storage of clay samples influence their mechanical characteristics?

2020 ◽  
Vol 57 (2) ◽  
pp. 304-309 ◽  
Author(s):  
Mustapha Abdellaziz ◽  
Mahmoud N. Hussien ◽  
Mohamed Chekired ◽  
Mourad Karray
Keyword(s):  
Mechanical Characteristics ◽  
Long Term Storage ◽  
Temperature And Humidity ◽  
Before And After ◽  
Prime Objective ◽  
Term Storage ◽  
Physical And Mechanical Characteristics

The prime objective of this study is to assess the influence of long-term storage on the physical and mechanical characteristics of clay samples. Samples from two different clays were sealed and stored in a temperature- and humidity-controlled room at the geotechnical laboratory of the Université de Sherbrooke for up to 27 years. The stored clay samples were tested before and after long-term storage and the results compared in this note. The comparison showed that even with long-term storage, the majority of the physical and mechanical characteristics of the samples were preserved.

Effect of Slag Content and Hardening Accelerator Dosage on the Physico-Mechanical Properties of Cement and Concrete

2011 ◽  
Vol 324 ◽  
pp. 392-395
Author(s):  
Riad Derabla ◽  
Imen Mokrani ◽  
Mohamed Larbi Benmalek
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mechanical Characteristics ◽  
Setting Time ◽  
Absorption Capacity ◽  
Early Age ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Physical And Mechanical Characteristics

Our contribution consists at the study of the effect of (0 %, 0.2 % and 0.34 %) dosage of an hardening accelerating plasticizer (Plastocrete 160, produced by Sika Aldjazair) on the properties of normal mortar and concretes prepared with portland cement artificial of Hadjar Soud cement factory (Skikda – Algeria) with addition of (10 % and 20 %) of granulated blast furnace slag finely crushed of the El Hadjar blast furnace (Annaba - Algeria). The tests are focused to the physical and mechanical characteristics of elaborated materials to knowing: setting time, porosity, water absorption capacity and the test of compressive strength at 2, 7 and 28 days. The results obtained show clearly the reliability of the additive used to accelerate the hardening and to obtain high strengths at early age, which increase by increasing of the additive dosage. For the slag, its low hydraulic capacity does not make it profitable than at the long term (beyond 28 days).

scholarly journals Waterproofing material for protection of underground structures

2019 ◽  
Vol 97 ◽  
pp. 02008
Author(s):  
Olga Lyapidevskaya
Keyword(s):  
Crack Resistance ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Ethylene Vinyl Acetate ◽  
Hard Coatings ◽  
Optimal Composition ◽  
Underground Structures ◽  
High Elasticity ◽  
Main Disadvantage ◽  
Physical And Mechanical Characteristics

The article deals with the problem of increasing the durability of underground and buried buildings. One of the methods of solving this problem is ensuring the reliable protection of underground structures from the effects of water of different origin. Among the existing waterproofing coatings, mineral-based compositions are the most effective. However, the main disadvantage of such systems is the low crack resistance of hard coatings, which limits their applicability. We have made an attempt to develop a cement-based waterproofing material that would have high elasticity, strength, crack resistance and adhesion to a concrete base. We have conducted studies to justify the possibility of obtaining an effective waterproofing material by including microsilica and ethylene vinyl acetate in the mix. The optimal composition of the material was worked out. On the basis of the experimental data, the main physical and mechanical properties of the material were established. Based on the obtained results, it was found that the resulting material had high physical and mechanical characteristics and could be recommended for the protection of concrete structures used in underground construction.

Physical and Mechanical Characteristics of Non-Clinker Slag Cement Concretes

2012 ◽  
Vol 482-484 ◽  
pp. 1566-1569
Author(s):  
Yi Qin
Keyword(s):  
Blast Furnace Slag ◽  
Mechanical Characteristics ◽  
Cement Concrete ◽  
Slag Cement ◽  
Water Quench ◽  
Early Strength ◽  
Furnace Slag ◽  
Better Than ◽  
Physical And Mechanical Characteristics

The performance of non-clinker slag cement concretes depends on the alkalinity of water quench blast furnace slag, the chemical composition, the rate of vitrification and the type and quantity of excitant. Non-clinker slag cement concretes was prepared with phosphorus gypsum as the excitant. by using the method compare with ordinary cement concrete（OPC）,We test strength and the bond strength of reinforced. The result showing, the Workability of NSC is better than OPC, the early strength lies in the ettringite and Approaching OPC. The long-term intensity lies in the C-S-H and Far more than OPC.

Development of Dry Sand-Lime New Multicomponent Mortars into the Historical Cultural Monuments Applied on Local Raw Basis

2022 ◽  
Vol 906 ◽  
pp. 53-58
Author(s):  
Hasmik Qaramyan
Keyword(s):  
Mechanical Characteristics ◽  
Detailed Examination ◽  
Technical Condition ◽  
Rehabilitation Work ◽  
Complex Development ◽  
Dry Sand ◽  
Basic Characteristics ◽  
Cultural Constructions ◽  
Cultural Monuments ◽  
Physical And Mechanical Characteristics

The visual and instrumental research of the technical condition of historical cultural constructions and their stone additions, documentation of their existing damages, as well as complex development and implementation of further collapse preventing measures and construction durability ensuring measures are presented. Application of processed sand-lime complex mortars based on local raw is offered for blockage of composition cracks during the rehabilitation work taking into consideration some averaged indices of Mape Antique I, Italian “Mapey” firm, similar injection mortar orientation basic characteristics (physical and mechanical characteristics, leakage, viability) and complete laboratory detailed examination results of the component mineralogical and physical and mechanical characteristics of the substances originally used in the construction. The data on local based raw processed sand-lime construction complex mortars (blockage mortar, injection mortar) physical and mechanical characteristics, thermographic dilatometric properties dependence on composition and fastening conditions of mortars are presented

Estimation of the Stability of the Assembly of the Dump of Technological Soil, Obtained from Open Works for the Recultivation of the Career Extract

2020 ◽  
Vol 24 (3) ◽  
pp. 51-53
Author(s):  
N.V. Kruk ◽  
D.A. Ozerskii
Keyword(s):  
Visual Inspection ◽  
Mechanical Characteristics ◽  
Field Tests ◽  
Laboratory Studies ◽  
Snow Melting ◽  
Safety Factors ◽  
Observation Well ◽  
Regulatory Requirements ◽  
The Stability ◽  
Physical And Mechanical Characteristics

To determine the stability of the ledge of dumps formed on the site being rehabilitated, using the technological soil obtained from the overburden works, the results of field tests and laboratory studies of the physical and mechanical characteristics of the technological soil are used. Numerical simulation of the calculation of stability is performed in a flat-vertical formulation, it is determined that the safety factors of the stability of the overburden slope meet the regulatory requirements. As recommendations, it was proposed to once a month to monitor the water level in the observation well, and especially closely during periods of snow melting (spring) and rains (autumn) and to conduct a visual inspection in the zone of obtaining the minimum curve for the occurrence of cracks and floods of the soil massif, in case of their occurrence, develop reinforcing measures.

scholarly journals Problem of the degradation criteria for transportation construction elements

2020 ◽  
Vol 164 ◽  
pp. 03014
Author(s):  
Albert Lantukh-Lyashchenko ◽  
Artur Onishchenko ◽  
Oleksandr Davydenko
Keyword(s):  
Life Cycle ◽  
Theoretical Basis ◽  
Damage Accumulation ◽  
Control Parameter ◽  
Mechanical Characteristics ◽  
Prediction Models ◽  
Technical Condition ◽  
Building Structures ◽  
Advantages And Disadvantages ◽  
Physical And Mechanical Characteristics

The article is devoted to the pressing problem of managing the reliability and durability of transport constructions. Modern scientific approaches to assessing the technical condition of transport facilities based on an analysis of element degradation during the life cycle of operation considered. The article presents the advantages and disadvantages of the most common prediction models of the technical condition of building structures. Each model uses a characteristic criterion for degradation of building structures: load and unload cycles, rejection number of chlorides, intensity coefficient, a geometric parameter (parameters) of the crack in the material, reliability, etc. The problem of choosing the control parameter of the lifecycle model of the bridge elements is analyzed. The theoretical basis for the Markov phenomenological model of damage accumulation and the model of degradation based on the physical and mechanical characteristics of the material formulated. Depending on the stage of the life cycle, it is proposed to select the type of prediction model.

scholarly journals Use of Slag Concrete in Construction of Underground Structures and Mines

2019 ◽  
Vol 105 ◽  
pp. 01039 ◽  
Author(s):  
Natalya Gilyazidinova ◽  
Evgeniy Shabanov ◽  
Xuesheng Liu
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mechanical Characteristics ◽  
Strength Gain ◽  
Underground Structures ◽  
Technological Parameters ◽  
Combined Use ◽  
Different Types ◽  
Furnace Slag ◽  
Physical And Mechanical Characteristics

The paper considers the possibility of using slag concrete in underground construction. Technological parameters for production of slag concrete with the set properties are defined. The influence of the composition of slag concrete used in the conditions of mine construction on the change of physical and mechanical characteristics, durability and stability is determined. The limits of technological parameters of slag concrete preparation are established. The possibilities of combined use of blast-furnace slags and clinkers for concrete in mine construction are substantiated. The chemical composition of blast furnace slag and the possibility of its application in the composition of concrete is described, the interaction of an aggregate - Portland cement with blast furnace slag is studied. The technique for conducting experiments to determine the rate of strength gain of different types of concrete is described. The rate of strength gains of heavy concrete and the rate of strength gain of slag concrete with additives and without additives have been compared. The possibility of application of this slag concrete in the process of concreting with the use of sliding formwork has been studied.

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