scholarly journals Axial Compression Properties of Calcium Caseinate Gels

1993 ◽  
Vol 76 (11) ◽  
pp. 3317-3326 ◽  
Author(s):  
R.P. Konstance
2021 ◽  
Vol 36 (2) ◽  
pp. 193-204
Author(s):  
Ö. Özbek ◽  
Ö. Y. Bozkurt ◽  
A. Erkliğ

Abstract The current study deals with the effect of basalt fiber hybridization on the compressive properties of composite pipes reinforced with glass fiber and carbon fiber. Hybrid and non-hybrid fiber reinforced pipes (FRPs) were fabricated through wet filament winding technique. Intraply fiber winding structure in which different fiber types were simultaneously wound at the layer was employed for the hybridization. The FRP samples wound by different fiber winding angles (± (40°), ± (55°), ± (70°)) were prepared in order to gain a better insight on the influence of basalt intraply fiber hybridization. The compression properties of FRP samples were experimentally determined by quasi-static compression tests using external parallel-plates for both the axial and radial directions. The non-hybrid carbon FRP pipes showed the maximum axial compression strength in parallel to the highest strength and lowest ductility of carbon fibers, while the minimum axial compression strength was obtained for the non-hybrid pipes reinforced with basalt fibers that, in comparison, exhibit much less strength and higher ductility. The pipes submitted to the axial compression tests predominantly failed due to the development of cracks and buckling along the fiber direction. While the inclusion of basalt fiber reduced the axial compression behavior of the non-hybrid carbon and glass FRP samples, it improved that behavior in the radial compression tests. Delamination was determined as the major failure mode for the damaged FRPs under radial compression. It is found that the incorporation of basalt fiber provides improvements in radial compression properties as opposed to axial compression properties and in the same manner the increment in fiber winding angle makes a positive contribution to radial compression properties.


2011 ◽  
Vol 71-78 ◽  
pp. 3474-3479
Author(s):  
Qian Zhu ◽  
Jun Hai Zhao ◽  
Xue Ying Wei ◽  
Juan Wang ◽  
Su Wang

Recycling of waste concrete is beneficial and necessary from the viewpoint of environmental preservation and effective utilization of resources. The carbon fiber reinforced polymer tendon (CFRP tendon) has been widely used in concrete structures due to its high-strength, lightweight, good erosion-resistance, diamagnetism and anti-fatigue. The compressive behavior of recycled-concrete-segment/lump filled steel tubular columns with inner CFRP tendons are investigated in this paper. The formula of ultimate capacities of the columns under axial compression has been derived based on unified strength theory. Good agreement can be found from the comparison of the analytical results obtained in this paper and experimental data. Parametric studies are carried out to evaluate the effects of intermediate principal stress, mixture ratio of the recycled concrete and reinforcement ratio on the bearing capacities of the columns.


2012 ◽  
Vol 204-208 ◽  
pp. 972-977
Author(s):  
Yun Feng Zhang ◽  
Shou Kang Liu ◽  
De Wang Zhao

Through the axial compression experiment of 9 GFRP tubes reinforced concrete columns, this paper analyzes the failure mode and loading-strain curves under different pipe diameter, and compares bearing capacity between the experimental data with FRP reinforced concrete and the calculated value without GFRP tubes reinforced concrete. he results show that the bearing capacity and ductility of GFRP tubes reinforced concrete column have improved, because of the restriction effect of FRP tubes. The confining ability of FRP tubes on concrete reduced for a certain thickness GFRP tubes constraint concrete short column, while the pipe diameter is increasing.


2021 ◽  
Vol 8 (2) ◽  
pp. 18-25
Author(s):  
Jingjing Wang ◽  
Lihua Lyu ◽  
Jing Guo ◽  
Xiaoqing Xiong ◽  
Ying Wang ◽  
...  

Axial compression properties of special-shaped 3D tubular woven composites with basalt fiber filament tows were studied. Special-shaped 3D tubular woven fabrics composites with three different thicknesses were woven on an ordinary loom and fabricated by the vacuum assisted resin transfer molding (VARTM) process. Load-displacement and energy-displacement curves were obtained from experimental tests. Results showed that for special-shaped 3D tubular woven composites, the load and energy absorption were greater with thickness and the compression property improved. Through the analysis of the mathematical equation and correlation coefficient of the load-displacement and energy-displacement relation, the fitting effect of the curves were good. The mathematical equation of the method could be used to simplify the functional relationship between load, energy, and displacement.


BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8093-8109
Author(s):  
Yan Liu ◽  
Shukai Tang ◽  
Yanfei Guo ◽  
Zhongping Xiao ◽  
Xiangyu Su

Bamboo scrimber is a versatile material made by rolling and defibering bamboo into loose reticulate bundles (unbroken horizontally, loose longitudinally, and interlaced) that are subjected to drying, gluing, assembling, and hot pressing. In this study, to better understand the application value of bamboo scrimber in construction engineering, the axial compression properties of bamboo scrimber columns with solid, hollow, and I-shaped cross-sections were investigated. For each column type, three lengths of 1 m, 1.5 m, and 2 m (three specimens of each length) were selected and subjected to axial compression testing. The results demonstrated that the primary failure mode of solid bamboo scrimber columns was instability failure, whereas that of hollow and I-shaped columns was mainly debonding failure. Experimental data were further analyzed to better understand and model the failure mechanisms of bamboo scrimber columns. This study led to the establishment of a design formula for bamboo scrimber solid columns, the calculations of which matched well with the experimental results.


2012 ◽  
Vol 193-194 ◽  
pp. 721-726
Author(s):  
Yun Feng Zhang ◽  
Zhong Liang Lv ◽  
De Wang Zhao

Through the axial compression experiment of 11 FRP reinforced concrete columns, this paper analyzes the failure mode and loading-strain curves.Comparison between the experimental data with FRP reinforced concrete and the calculated value without FRP reinforced concrete is done. The results show that the reinforcement for the component will increase ductility and ultimate bearing capacity of the composite column, but the increase of reinforcement ratio will also reduce confining ability of FRP tubes.


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