scholarly journals Design and Experimental Verification of Asphalt-Based Material for Grouting of Prestressed Structure

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Eryu Zhu ◽  
Yuancheng Ni ◽  
Yujie Li ◽  
Li Zhu
Keyword(s):  
Shear Strength ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Corrosive Environment ◽  
Stray Current ◽  
Grouting Material ◽  
Slaked Lime ◽  
Natural Asphalt ◽  
Prestressed Structures

The quality of the grouting is an important factor affecting the durability of prestressed structures, especially in corrosive environment with stray current. Uncompacted grouting will lead to rapid corrosion and failure of steel strand. In this paper, an asphalt-based material as grouting material was designed to solve this problem due to the characteristics of asphalt material as impermeability, anticorrosion, and insulation. The viscosity and shear strength were considered as the main performance parameters of the grouting material for prestressed grouting. The composition and proportion of the asphalt-based material were determined through the tests, including natural asphalt (rock asphalt) being 12.5% and admixture (slaked lime and cement) being 40%. For this grouting material, the shear strength was 697.21 kPa at normal temperature, and the suitable grouting temperature was 115°C. Then, the grouting test of the prestressed concrete beam was carried out to verify the groutability of this material. The grouting slurry can be filled with prestressed duct, and the temperature stress of the concrete near the duct was lower than 1.4 MPa, which met the safety requirement of the concrete. This study provides a new option for guaranteeing the quality of grouting and improving the durability of prestressed structures in corrosive environment.

scholarly journals ULTIMATE SHEAR STRENGTH OF PRESTRESSED CONCRETE BEAM

1998 ◽  
Vol 63 (505) ◽  
pp. 107-114 ◽  
Author(s):  
Tsuyoshi FUKUI ◽  
Akira OOKUMA ◽  
Masayuki HAMAHARA ◽  
Hiromitsu SUETSUGU
Keyword(s):  
Shear Strength ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Ultimate Shear Strength ◽  
Prestressed Concrete Beam

A STUDY OF GROUTING MATERIAL BLEEDING PROPERTIES FOR PRESTRESSED CONCRETE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Kyung-Taek Koh ◽  
Gum-Sung Ryu ◽  
Gi-Hong Ahn
Keyword(s):  
Aluminum Powder ◽  
Prestressed Concrete ◽  
High Performance ◽  
Volumetric Change ◽  
Testing Method ◽  
Grouting Material

This study investigates the workability, bleeding, and volumetric change of grout widely used in Korea for securing the quality of grout applied in prestressed concrete (PC) bridges. The results reveal that the workability satisfies all the criteria for the grout specified in Korea. It appears that bleeding increases by 5.7 to 6.7 times when the tendon is arranged, regardless of the quality of grout, and that the height and inclination of the grout sample significantly affect bleeding. Furthermore, the arrangements of tendons were seen to prevent expansion even in grout using expansive aluminum powder, but was also seen to let shrinkage occur with a significant increase in bleeding. The conclusion is that it is necessary to establish a new testing method and apply high-performance grout for securing the quality of the grout used in PC bridges.

The quality of the wood bonding depending on the method of applying the selected thermoplastic biopolymers

2021 ◽  
Vol 116 ◽  
pp. 78-85
Author(s):  
Aneta Gumowska ◽  
Grzegorz Kowaluk
Keyword(s):  
Shear Strength ◽  
Solid Wood ◽  
Average Value ◽  
Wood Bonding ◽  
Research Show

The quality of the wood bonding depending on the method of applying the selected thermoplastic biopolymers. The aim of the research was to determine the effect of the method of applying the biopolymer on the surface of bonding solid wood elements on the quality of the obtained adhesive connection. The results of conducted mechanical research show that the highest average value of shear strength was observed for birch lamellas bonded with PLA, both with the first and second method of application. In case of estimating the quality of the bonding of wooden elements, better results were achieved for PLA and the second method of application the "green" adhesive.

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