Experimental evaluation of the dynamic bond strength between CFRP sheets and steel under direct tensile loads

2013 ◽  
Vol 40 ◽  
pp. 89-102 ◽  
Author(s):  
Haider A. Al-Zubaidy ◽  
Xiao-Ling Zhao ◽  
Riadh Al-Mahaidi
Keyword(s):  
Bond Strength ◽  
Experimental Evaluation ◽  
Cfrp Sheets ◽  
Direct Tensile

scholarly journals The Influence of Lime Solution in Kneading Water Substitution on Cement Roughcast and Mortar Coating

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4174
Author(s):  
André M. Santos ◽  
Ângelo J. Costa e Silva ◽  
João M. F. Mota ◽  
João M. P. Q. Delgado ◽  
Fernando A. N. Silva ◽  
...  
Keyword(s):  
Bond Strength ◽  
Concrete Block ◽  
Tensile Bond Strength ◽  
Water Penetration ◽  
Strength Tests ◽  
Lime Solution ◽  
Concrete Blocks ◽  
Materials Used ◽  
Bonding Systems ◽  
Direct Tensile

The understanding of the mechanical fixation behavior of coatings is crucial for a better comprehension of the bonding systems, especially at the interface between the mortar and the substrate. Physical adherence is related, among other things, to the contents of the materials used in the roughcast and mortar coatings, due to the colloidal water penetration into the pores of the substrate. This work evaluated the influence of different lime solution additions replacing the kneading water in the preparation of roughcast and mortar coatings. Two types of substrates were investigated:ceramic bricks and concrete blocks. Three wall masonry panels were constructed, with dimensions of 220 × 180 cm2, one of concrete block and two of ceramic bricks, followed by the application of roughcast and mortar coating with an average thickness of 5 mm and 20 mm, respectively. Direct tensile bond strength tests were performed and the results, with a 95% confidence level, showed that substrate ceramic and treatment in the roughcast exhibited a better behavior regarding the distribution of the tensile bond strength of the tested specimens. However, no significant differences of the amount of addition used (0%, 5%, 10% and 15%) on the tensile bond strength were observed.

scholarly journals Relations between Surface Roughness Indexes and Bond Strength between CFRP Sheets and Concrete.

2000 ◽  
Vol 49 (6) ◽  
pp. 685-691 ◽  
Author(s):  
Masakazu MITSUI ◽  
Kimio FUKUZAWA ◽  
Tatsuya NUMAO ◽  
Ikuo FUDA
Keyword(s):  
Surface Roughness ◽  
Bond Strength ◽  
Cfrp Sheets

Bond Characterization of Steel-CFRP with Carbon Nanotube Modified Epoxy Adhesive via Pull-off Tests

2015 ◽  
Vol 15 (08) ◽  
pp. 1540027 ◽  
Author(s):  
Asghar H. Korayem ◽  
Yan Ming Liu ◽  
Xiao Ling Zhao ◽  
Wen Hui Duan
Keyword(s):  
Carbon Nanotube ◽  
Bond Strength ◽  
Steel Substrate ◽  
Epoxy Adhesive ◽  
Sem Analysis ◽  
Cfrp Laminates ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Modified Epoxy

This paper presents an experimental investigation of the bond strength between carbon fiber reinforced polymer (CFRP) and steel substrate by utilizing the pull-off test and scanning electron microscope (SEM) analysis. A series of pull-off experiments was conducted by using three types of CFRP (CFRP sheets and CFRP laminates with/without woven mesh) and two types of epoxy adhesive (ductile and brittle epoxy adhesive) with/without carbon nanotube (CNT) modification. Pull-off samples with CFRP laminates possess higher (about double) bond strength than that of samples with CFRP sheets, due to the good saturation of fibers in the laminates. The steel-CFRP bond with ductile epoxy adhesive (Araldite 2011) is found to have about 16% higher bond strength when compared to that of brittle epoxy (MBrace Saturant), even though the tensile strength of Araldite 2011 is about 40% less than that of MBrace Saturant. Also, it is shown that modified epoxy with CNTs is more efficient than neat epoxy for bonding CFRP to steel at a moderately elevated temperature, and increasing the bond strength about twofold.

Interface Shear Strength of Carbon Fiber Mesh (CFM) Attached to RC Surface for External Reinforcing

2006 ◽  
Vol 324-325 ◽  
pp. 799-802
Author(s):  
Soo Yeon Seo ◽  
Hyun Do Yun ◽  
Chang Sik Choi ◽  
Ki Bong Choi
Keyword(s):  
Carbon Fiber ◽  
Bond Strength ◽  
Drying Shrinkage ◽  
Strengthening Effect ◽  
Interface Shear ◽  
Existing Structures ◽  
Externally Bonded ◽  
Direct Tensile ◽  
Direct Tensile Test ◽  
Fiber Mesh

The strengthening of concrete structures in situ with externally bonded carbon fiber is increasingly being used for repair and rehabilitation of existing structures since carbon fiber has good mechanical properties such as high tensile strength, good resistances to corrosion, and low self-weight, which are attractive for retrofitting of RC member. In using Carbon Fiber Mesh (CFM) as a retrofit material for RC member, most important structural property that should be developed is the bond strength between RC member and CFM. The additional strength increment by CFM can be developed if the bond strength is sufficient. If it is not, the strengthening effect can not be expected due to the bond failure between concrete and CFM. A direct tensile test was performed in order to find the variation of bond strength and load-displacement response of CFM attached to the concrete and the result is presented in this paper. The key parameters of the test are the location of clip for the installation of CFM, number of clips and thickness of cover mortar. Test results indicate that the bond strength is dependent on the number of clips and maximized at clip numbers of three per each rod. In specimens without clips, the highest strength was found in the specimen with cove mortar of 30mm and lowest one in specimen with largest mortar thickness. This means that in too much thick of cover mortar, it seems that the amount of drying shrinkage is increased and this reduces rather than improves the bond strength.

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