Papers by Keyword: Strength Properties

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Authors: J.M. Owoyemi, Babatunde Ajayi, O.S. Ogunrinde
Abstract: Homogeneous cement bonded paperboards were made with recycled newsprints and Kraft paper with ordinary Portland cement and curing reagent. Boards were produced at the blending proportions of 100:0, 50:50 and 0:100 respectively and at cement/ paper ratio of 1:1, 2:1 and 3:1 respectively. Dimensional movements were evaluated to investigate the effect of the variables used in board manufacturing before and after exposure to accelerated aging tests procedure. Increase in mixing ratio and blending proportion caused decrease in Thickness Swelling (TS) and Water Absorption (WA) while TS and WA of the untreated boards were lower than the accelerated aging treated boards. The dimensional movement of Kraft paper was higher than that of recycled newsprint before and after accelerated aging treatment. The strongest and most dimensionally stable board was produced at the highest level of cement/ paper ratio. The pre-accelerated ageing test carried out showed that mechanical properties were higher 2:1 and 3:1 paper cement mixing ratios. Kraft paper produced the strongest and most dimensionally stable board than recycled newsprint. From this study Kraft paper and recycled newsprint proved to be suitable for the manufacture of cement bonded paperboard capable of meeting the needs in core and low cost housing construction.
Authors: Yan Li, Ze Jun Liu
Abstract: Abstract. Based on an extensive experimental program, the paper studies the behavior of High Performance Fiber Reinforced Cement Composite (HPFRCC) under Uniaxial compression. The experimental parameters are: PVA fiber content by volume, fly ash and silica fume content. The compressive strength, peak strain as well as compressive stress-strain curves are obtained. The test results reveal that PVA fibers can greatly improve plastic deformation ability of HPFRCC, especially have significant impact on ductility after the peak stress, though fiber content has small influence on compressive strength. With the increase of fly ash content, peak stress of HPFRCC decreases, but toughness increases. 10% silica fume content has not obvious effect on compressive strength for HPFRCC with large quantities of fly ash , but leads to less ductile behavior.
Authors: Vladimír Suchánek, Matěj Slováček
Abstract: This article describes experimental work carried out by the Department of Transport Structures of Jan Perner Transport Faculty, University of Pardubice in the laboratory facilities of the Training and Research Centre in Transport.This is an effective change of properties by admixing the additional air-entraining agents, or steel fibers, or combinations thereof to the delivered batches.The final chapter summarizes the laboratory results, including the effect of air content on the physico-mechanical characteristics and durability of concrete.
Authors: Zhao Qing Lu, Qiang Xu, Zhen Wu, Zhi Jie Wang
Abstract: Polyimide fibers and polyamide acid fibers was used as main materials to make polyimide fiber paper. The effect of the properties of polyimide fiber paper by hot pressing temperature and hot pressing pressure was discussed. The experimental results showed that when the pressure of hot pressing was 12Mpa and the hot temperature of hot pressing was 220°C, the sheet had excellent strength properties and electrical performance.
Authors: Vladimír Suchánek, Michal Radouš
Abstract: This article deals with the description and evaluation of experimental work carried out by the Department of Transport Structures of Jan Perner Transport Faculty, University of Pardubice in the laboratory facilities of the Training and Research Centre in Transport.This is design of high-strength concrete according to three recipes using two different approaches in the design of concrete.The article also describes results of test bodies made of fresh and hardened concrete.
Authors: V.E. Ovcharenko, Yuriy F. Ivanov, A.A. Mohovikov, A.S. Ignatyev, Yu Baohai, Hong Wei Zhang
Abstract: A comparative analysis of the surface-layer microstructure of a tungsten-based cermet alloy modified with pulsed high-energy electron beams generated by gas-discharge plasmas and of the tool life of metal-cutting plates prepared from this alloy is performed. The choice of a plasma-forming gas providing for the emission of electrons out of the plasma-filled cathode is shown to have a profound influence both on the formation process of nanosized structural-phase states in the surface layer of the cermet alloy and on the tool life of the metal-cutting plates prepared from this alloy.
Authors: Chun Ying Fu, Dong Sheng Jiang
Abstract: In order to overcome weaknesses of the limited strength of the traditional corrugated cardboard, and the corrugated cardboard with alternative high and low corrugated sandwich cores was developed by someone, named highly elastic corrugated cardboard. The highly elastic corrugated cardboard has excellent rebound properties of cushioning . On the existing research results, according to Wang Dong-mei development of its production methods, the author can product highly elastic corrugated cardboard in the laboratory in order to study its Strength properties. These experimental data provide a basis for actual production.
Authors: Quan Hong Ma, Mei Yan Qu, Xue Song Xu, Le Le Hu
Abstract: To reduce shrinkage cracks of cement stabilized macadam base and prolong the life span of pavement, layered materials were mixed in cement stabilized macadam to improve its strength properties and crack resistance. In comparison with the blank test, the unconfined compressive strength increases with the addition of layered materials (weighed at 10% of the amount of cement), by 11.6% with palygorskite, 12.7% with kaolin and 8.9% with montmorillonite, respecetively, at the curing age of 28 days; dry-shrinkage coefficient reduces by 28.2% with palygorskite, 19.0% with kaolin and 14.2% with montmorillonite after 48 days, respecetively. Microstructure of cement pastes mixed with layered materials were observed by scanning electronic microscope. The result shows that more fibrous hydration products and a net-like microstructure exist in cement pastes with palygorskite. It may explain the maximum decrease in shrinkage cracks of palygorskite-mixed cement stabilized macadam.
Authors: E.V. Koreshkova, A.A. Kulemina
Abstract: A study of phase composition, texture and structure of electrolytic Fe-Mo deposits is presented. It was proven that molybdenum changes the parameters increasing the dispersiveness of the plating structure. It is also explored that electrolytic Fe-Mo deposits can be used as strengthening ones.
Authors: Arseny O. Artemov, Michael N. Ignatov, Anna M. Ignatova
Abstract: Study and description of positive effect influence of Cr2O3 catalyst in controlled crystallization technology for production of stone casting silicate materials are provided. The introduction of heat treatment method that influences the forming of the structural components of produced material. The basis of manufacturing stone casting silicate materials is controlled crystallization of silicate melt that is organized in such a way that nucleation occurs within the melt and the final product has a fine grain structure. The structural components of silicate stone casting materials and their influence on strength properties are determined. The strength of stone casting silicate materials is the reduction in the difference in the temperature coefficients of linear expansion of crystal phases and residual glass phase.
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