Comparative Analysis of Influence of Nanomodification and Micro-Dispersed Reinforcement on the Process and Parameters of Destruction of High-Strength Lightweight Concrete

2018 ◽  
Vol 750 (7) ◽  
pp. 11-15
Author(s):  
A.S. INOZEMTSEV ◽  
◽  
E.V. KOROLEV ◽  
Keyword(s):  
Comparative Analysis ◽  
Lightweight Concrete ◽  
High Strength

High strength flowable lightweight concrete incorporating low C3A cement, silica fume, stalite and macro-polyfelin polymer fibres

2021 ◽  
Vol 281 ◽  
pp. 122410
Author(s):  
Huiyuan Liu ◽  
Mohamed Elchalakani ◽  
Ali Karrech ◽  
Sherif Yehia ◽  
Bo Yang
Keyword(s):  
Silica Fume ◽  
Lightweight Concrete ◽  
High Strength

Research and Applying Evolution of High Efficient Water-Reducing Agent for High Performance Concrete

2012 ◽  
Vol 610-613 ◽  
pp. 573-576
Author(s):  
Zheng Jun Wang ◽  
Jia Bin Liang
Keyword(s):  
High Performance ◽  
Lightweight Concrete ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Reducing Agent ◽  
Mass Concrete ◽  
Green Concrete ◽  
High Efficient ◽  
Strength And Durability

This paper discusses the development of water-reducing agent and the present situation of the application of high performance concrete. The traditional concrete will be substituted by high performance concrete, green concrete. In the course of appearance of high performance and green, concrete admixtures plays an extremely important role. Concrete water-reducing agent is admixture of the main part. In the case of keeping liquidity, it can make water consumption reduce, so the concrete strength and durability can be improved. It is applicable to all kinds of industrial and civil construction engineering, and it can be applied to different strength grade of concrete. It has important significance for mass concrete engineering, marine building facilities, and component and product of high strength lightweight concrete.

The Design and Size Optimization of the New FCEV Subframe Based on Hypermesh Platform

2011 ◽  
Vol 328-330 ◽  
pp. 435-440
Author(s):  
Jun Liao ◽  
Lan Shan ◽  
Yan Feng
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Finite Element Model ◽  
Mode Shape ◽  
High Strength Steel ◽  
High Strength ◽  
Element Model ◽  
Strength Analysis ◽  
Size Optimization ◽  
Optimal Size

The establishment of FCEV finite element model of the subframe is based on Hypermesh platform, and a new subframe structure is designed in accordance with the stiffness and strength analysis on the original subframe in all conditions. High-strength steel materials are used to optimize the design of this new structure, which result in the optimal size. Through the comparative analysis of the strength, stiffness, mode shape and quality on new subframe and the original one, it is verified that the design of the new subframe is reasonable and feasible.

scholarly journals Shear-friction behaviour on smooth interface between high-strength and lightweight concrete

2020 ◽  
Vol 72 (2) ◽  
pp. 68-87 ◽  
Author(s):  
Zhuangcheng Fang ◽  
Haibo Jiang ◽  
Airong Liu ◽  
Jiahui Feng ◽  
Yuhong Li
Keyword(s):  
Lightweight Concrete ◽  
High Strength ◽  
Smooth Interface ◽  
Shear Friction ◽  
Friction Behaviour

Nanoscale modifier as an adhesive for hollow microspheres to increase the strength of high-strength lightweight concrete

2017 ◽  
Vol 18 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Aleksandr S Inozemtcev ◽  
Evgenij V Korolev ◽  
Vladimir A Smirnov
Keyword(s):  
Lightweight Concrete ◽  
High Strength ◽  
Hollow Microspheres

Study of the Prospects of the Use of High-Strength Steel Shapes

2013 ◽  
Vol 475-476 ◽  
pp. 1253-1256
Author(s):  
Valentina Parlashkevich ◽  
Oleg Tsyba
Keyword(s):  
Comparative Analysis ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Structural Elements ◽  
Steel Shapes ◽  
Economic Indices

The prospects of the use of rolled shapes made of high-strength steels in steel structural elements are considered. A comparative analysis of strength values and economic indices of steel structural elements is done for their work in compression, tension and bending.

New Type of High-Strength Support in Deep Soft Rock Roadway

2013 ◽  
Vol 724-725 ◽  
pp. 1520-1525
Author(s):  
Ji Cheng Feng ◽  
Hong Jiao Li ◽  
Zhi Chao Zhao ◽  
Wen Long Zhang
Keyword(s):  
Comparative Analysis ◽  
Bending Strength ◽  
Soft Rock ◽  
High Strength ◽  
Field Application ◽  
Good Effect ◽  
Deformation And Failure ◽  
Pumping Station ◽  
Arch Support ◽  
Working Resistance

In order to control the deformation of large section surrounding rock in 700m level of the main drainage pumping station in the experimental mine, according to the reason for deformation and failure of the main drainage pumping station and material mechanics, fully-closed U-shaped support which used double welding I-steel bottom arch as the main structure was designed and the assembly and principles of support were described in detail, based on theoretical calculation and comparative analysis on the structure and mechanical properties of rectangular I-beam support, U-steel support, single I-beam arch support and double I-beam arch support. Based on the comparative analysis by numerical simulation, the rationality of the high strength support and the detailed support parameters were determined. It gets good effect in field application and ensures the long-term stability of the main drainage pumping station. The results show that: the double-layer I-beam 12# can increase bending strength by about 7.5 times. Double trough splint device used in shoulder of the support has the advantages of high strength, greater rigidity, good pliability and stable working resistance.

Lightweight Concrete Based on Gypseous Binding Materials, Modified with Microcrystalline Cellulose, and Cavitationly Processed Sawdust

2019 ◽  
Vol 945 ◽  
pp. 188-192 ◽  
Author(s):  
A.A. Pykin ◽  
E.Y. Gornostaeva ◽  
N.P. Lukutsova ◽  
J.S. Pykina
Keyword(s):  
Mechanical Properties ◽  
Microcrystalline Cellulose ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Water Soluble ◽  
Waste Wood ◽  
Matrix Microstructure ◽  
Calcium Sulfate Dihydrate ◽  
Reducing Substances

The physical and mechanical properties of lightweight constructional heat-insulating concrete (sawdust gypsum concrete) with high-strength gypsum binder, modified by food cotton microcrystalline cellulose and organic fillers of plant origin from the waste wood of coniferous and deciduous species in the form of cavitationly processed pine and birch sawdust have been studied. The dependence of the cavitation extraction time of water-soluble reducing substances (sugars) from sawdust on the strength of sawdust gypsum concrete is established. The changes in microstructure of the gypsum matrix, the mean density, bending tension strength and compression strength, the thermal conductivity coefficient of sawdust gypsum concrete on the basis of the cavitationly processed sawdust with the introduction of microcrystalline cellulose are analyzed. It is proven that microcrystalline cellulose compacts the space between the crystalline hydrates of calcium sulfate dihydrate in the gypsum matrix microstructure and improves the physical and mechanical properties of sawdust gypsum concrete.

Effect of confinement on the behaviour of high-strength lightweight concrete columns

1986 ◽  
Vol 13 (6) ◽  
pp. 741-751 ◽  
Author(s):  
R. Basset ◽  
S. M. Uzumeri
Keyword(s):  
Experimental Investigation ◽  
Lightweight Concrete ◽  
Concrete Strength ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Concrete Columns ◽  
Lightweight Aggregate Concrete ◽  
Test Results ◽  
Aggregate Concrete ◽  
Concrete Confinement

This paper summarizes an experimental investigation into the behaviour of high strength sand – lightweight concrete columns confined with rectangular ties. Fifteen reinforced and three unreinforced specimens were tested under monotonically increasing axial compression. Variables considered in this study were the longitudinal steel distribution and tie configuration, the tie steel spacing, the amount of tie steel, and the amount of longitudinal steel.The results indicated that unconfined high-strength lightweight aggregate concrete is a brittle material. The addition of lateral confining steel significantly improved the behaviour of this material, with a large amount of lateral steel resulting in very ductile behaviour. The tie configuration and resulting distribution of longitudinal steel contributed significantly to the confinement of concrete, with well-distributed steel resulting in improved behaviour. The ratio of specimen to cylinder concrete strength was observed to be 0.98, which is much higher than the commonly assumed value of 0.85.The test results were compared with results from selected theoretical confinement models. Based on the results of this investigation, existing models for concrete confinement give unconservative results for high-strength lightweight aggregate concrete and overestimate the ductility that can be achieved with this material. Key words: columns, confinement, ductility, high-strength concretes, lightweight aggregate concretes, reinforcement, stress–strain relationships, tests, ties, toughness.

scholarly journals Enhancing Functionality of Epoxy–TiO2-Embedded High-Strength Lightweight Aggregates

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2384 ◽  
Author(s):  
Taekyung Lim ◽  
Jeong Hui Lee ◽  
Ju-Hyun Mun ◽  
Keun-Hyeok Yang ◽  
Sanghyun Ju ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Large Scale ◽  
Lightweight Concrete ◽  
High Strength ◽  
Air Pollutant ◽  
Mixed Solution ◽  
Research Attention ◽  
High Rise ◽  
Structural And Functional Properties ◽  
Architectural Structures

With the increasing trend of high-rise, large-scale, and functional modern architectural structures, lightweight aggregate (LWA) concrete that exhibits excellent strength and high functionality has garnered active research attention. In particular, as the properties of concrete vary considerably with the raw materials and the proportions of aggregates in the mix, in-depth research on weight reduction, strength improvement, and functional enhancements of aggregates is crucial. This study used the negative pressure coating of a mixed solution comprising epoxy (mixture of epoxy resin and crosslinker), hyper-crosslinked polymer, and titanium oxide (TiO2) nanoparticles on the LWA, and achieved an improvement in the strength of the LWA as well as a reduction in air pollutants such as NOx and SOx. Compared to a normal LWA with an aggregate impact value (AIV) of 38.7%, the AIV of the proposed epoxy–TiO2-embedded high-strength functional LWA was reduced by approximately half to 21.1%. In addition, the reduction rates of NOx and SOx gases resulting from the photocatalytic properties of TiO2 nanoparticles coated with epoxy were approximately 90.9% and 92.8%, respectively. Epoxy–TiO2, embedded in LWAs through a mixture, exhibited stability, high strength, and a reduction in air pollutant characteristics, despite repeated water washing. The LWA proposed herein offers excellent structural and functional properties and is expected to be used in functional lightweight concrete that can be practically applied in high-rise and large-scale architectural structures.

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