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A platform for research: civil engineering, architecture and urbanism
Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling
https://orcid.org/0000-0002-0615-1235
Abstract Joints in concrete structures must perform under various complex loads including torsion. This paper reports the results of an experimental programme investigating the static torsional performance of epoxy-bonded concrete joints. Torsion tests were performed using a custom experimental setup able to apply torque on a hollow concrete prism with an epoxy joint in the middle. The tested specimens failed in both cohesive and mixed modes. The cohesive failure mode was characterised by cracking in the body of concrete, while the mixed mode also included partial debonding of the joint. The cohesive mode was dominant, more ductile and exhibited higher torsional strength. The cracking behaviour of the jointed specimens was typical of concrete prisms under torsion except that in the mixed mode a crack developed along the joint on two or three specimen sides. Digital Image Correlation, applied for monitoring surface strain, showed that inclined bands of high shear strain passed across the joint during the tests. The mechanism of concrete-epoxy debonding was investigated using two standard testing methods. The low shear strength of concrete near the epoxy joint was identified as the source for the weaker, stiffer and more brittle response of the mixed failure mode in the torsion tests.
Highlights Experimental setup developed for testing epoxy-jointed concrete specimens in torsion. DIC showed included bands of high shear strain passing across the joint during testing. Specimens failed in two distinct modes involving concrete cracking and joint partial debonding. Failure by joint partial debonding was weaker and stiffer than failure by concrete cracking. Mechanism of concrete-epoxy debonding investigated using Push and Pull tests.
Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling
https://orcid.org/0000-0002-0615-1235
Abstract Joints in concrete structures must perform under various complex loads including torsion. This paper reports the results of an experimental programme investigating the static torsional performance of epoxy-bonded concrete joints. Torsion tests were performed using a custom experimental setup able to apply torque on a hollow concrete prism with an epoxy joint in the middle. The tested specimens failed in both cohesive and mixed modes. The cohesive failure mode was characterised by cracking in the body of concrete, while the mixed mode also included partial debonding of the joint. The cohesive mode was dominant, more ductile and exhibited higher torsional strength. The cracking behaviour of the jointed specimens was typical of concrete prisms under torsion except that in the mixed mode a crack developed along the joint on two or three specimen sides. Digital Image Correlation, applied for monitoring surface strain, showed that inclined bands of high shear strain passed across the joint during the tests. The mechanism of concrete-epoxy debonding was investigated using two standard testing methods. The low shear strength of concrete near the epoxy joint was identified as the source for the weaker, stiffer and more brittle response of the mixed failure mode in the torsion tests.
Highlights Experimental setup developed for testing epoxy-jointed concrete specimens in torsion. DIC showed included bands of high shear strain passing across the joint during testing. Specimens failed in two distinct modes involving concrete cracking and joint partial debonding. Failure by joint partial debonding was weaker and stiffer than failure by concrete cracking. Mechanism of concrete-epoxy debonding investigated using Push and Pull tests.
Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling
https://orcid.org/0000-0002-0615-1235
Abstract Joints in concrete structures must perform under various complex loads including torsion. This paper reports the results of an experimental programme investigating the static torsional performance of epoxy-bonded concrete joints. Torsion tests were performed using a custom experimental setup able to apply torque on a hollow concrete prism with an epoxy joint in the middle. The tested specimens failed in both cohesive and mixed modes. The cohesive failure mode was characterised by cracking in the body of concrete, while the mixed mode also included partial debonding of the joint. The cohesive mode was dominant, more ductile and exhibited higher torsional strength. The cracking behaviour of the jointed specimens was typical of concrete prisms under torsion except that in the mixed mode a crack developed along the joint on two or three specimen sides. Digital Image Correlation, applied for monitoring surface strain, showed that inclined bands of high shear strain passed across the joint during the tests. The mechanism of concrete-epoxy debonding was investigated using two standard testing methods. The low shear strength of concrete near the epoxy joint was identified as the source for the weaker, stiffer and more brittle response of the mixed failure mode in the torsion tests.
Highlights Experimental setup developed for testing epoxy-jointed concrete specimens in torsion. DIC showed included bands of high shear strain passing across the joint during testing. Specimens failed in two distinct modes involving concrete cracking and joint partial debonding. Failure by joint partial debonding was weaker and stiffer than failure by concrete cracking. Mechanism of concrete-epoxy debonding investigated using Push and Pull tests.
Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling
Chernin, Leon (author) / Newlands, Moray (author) / Khosravi, Noushin (author)
2023-12-09
Article (Journal)
Electronic Resource
English
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