Tensile-Shear Bond Strength and Failure Between Aggregate and Mortar

Abstract Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of the rock to some degree. The coarse-grained sandstone with strength of less than 40 MPa was studied by the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, the evolution law of peak strength and failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of rock was positively correlated with the bond strength, the difference value between tensile and shear crack was negatively correlated with tensile bond strength and positively correlated with shear bond strength. Tensile-shear bond strength ratio less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. Tensile crack was negatively correlated with the tensile-shear bond strength ratio, shear crack was positively correlated with the tensile-shear bond strength ratio. The failure mode of coarse-grained sandstone is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

Download Full-text

Pengaruh bahan bonding self-etch terhadap kekuatan perlekatan antara pasak glass fiber dengan resin komposit

Jurnal Material Kedokteran Gigi ◽

10.32793/jmkg.v1i1.153 ◽

2012 ◽

Vol 1 (1) ◽

pp. 1

Author(s):

Astrid Yudhit ◽

Rusfian Dayuni Ariski S

Keyword(s):

Bond Strength ◽

Glass Fiber ◽

Shear Bond Strength ◽

Resin Composite ◽

Testing Machine ◽

Bonding Agent ◽

Tensile Shear ◽

Fiber Post ◽

Glass Fiber Post ◽

Self Etch

Nowadays, glass fiber post and composite resin cores have been used in endodontic treatment for esthetics achievement. The success of this treatment was affected by some factors such as bond strength between post and cores. The aim of this study is to investigate the effect of self etch bonding agent that use as adhesive materials between glass fiber post and resin composite by its bond strength. Totally twenty samples is used in this study, and divided in two groups (n=10 for each group), bonding group agents and without bonding agent group (control). The tensile-shear bond strength tested with Universal Testing Machine. Then, the bond strength values were analyzed statistically with t-test (p≤ 0,05). The result shows that bonds strength values in bonding agent groups were higher than without bonding agent groups. But, there is no significantly different between groups. In conclusion, bonding agent did not have effect on tensile-shear bond strength between glass fiber post and resin composite.

Download Full-text

Study on the Effect of Bond Strength on the Failure Mode of Coarse-Grained Sandstone in Weakly Cemented Stratum

Minerals ◽

10.3390/min12010055 ◽

2021 ◽

Vol 12 (1) ◽

pp. 55

Author(s):

Xianda Yang ◽

Lihui Sun ◽

Jiale Song ◽

Bensheng Yang ◽

Chengren Lan ◽

...

Keyword(s):

Bond Strength ◽

Failure Mode ◽

Shear Bond Strength ◽

Shear Failure ◽

Peak Strength ◽

Tensile Bond Strength ◽

Coarse Grained ◽

Strength Ratio ◽

Shear Cracks ◽

Tensile Shear

Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of rock to some degree. Coarse-grained sandstone was studied using the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, and the evolution law of peak strength and the failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of the rock was positively correlated with the bond strength; the difference in quantity between the tensile and shear cracks was negatively correlated with tensile bond strength and positively correlated with shear bond strength. With a tensile-shear bond strength ratio of less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. The tensile cracks were negatively correlated with the tensile-shear bond strength ratio, and the shear cracks were positively correlated with the tensile-shear bond strength ratio. The main failure mode of the coarse-grained sandstone in the weakly cemented stratum of the Hongqinghe coal mine is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

Download Full-text