Experimental study of fracture properties of interfacial transition zone by three-point bending tests on granite-mortar hybrid beams

2020 ◽  
Vol 263 ◽  
pp. 120605
Author(s):  
Heli Ji ◽  
Xinhua Yang ◽  
Zuyun Luo
Keyword(s):  
Experimental Study ◽  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Bending Tests ◽  
Fracture Properties ◽  
Three Point Bending ◽  
Hybrid Beams

Fracture Response of Fine-Grained Cement-Based Composite Specimens with Special Inclusions

2019 ◽  
Vol 292 ◽  
pp. 63-68 ◽  
Author(s):  
Michal Vyhlídal ◽  
Iva Rozsypalová ◽  
Tomáš Majda ◽  
Petr Daněk ◽  
Hana Šimonová ◽  
...  
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Mechanical Fracture ◽  
Three Point Bending ◽  
Fine Grained ◽  
Fracture Parameters ◽  
Edge Notch ◽  
Fracture Tests ◽  
Materials Used ◽  
Bending Fracture

This paper concerns research into the importance of the interfacial transition zone around inclusions of selected materials in fine-grained cement-based composite. Tests were performed on eight sets of prismatic test specimens. The sets differed in the inclusion materials used, which were placed at midspan above the initial central edge notch. The first was a reference set without any inclusion, the second contained a steel inclusion, four more contained different types of rock inclusion, the seventh contained an inclusion of extruded polystyrene, and the last contained a space of the same dimensions as that occupied by the inclusions in sets 2 to 7. The test specimens were subjected to three-point bending fracture tests at the age of (usually) 28 days. The fracture response was analysed by means of fracture mechanics theory, and apparent mechanical fracture parameters (modulus of elasticity, fracture toughness and fracture energy) were evaluated. The conclusion shows that a possible relationship exists between the differences in the mechanical fracture parameters of specimens with/without an inclusion and the existence of the interfacial transition zone.

scholarly journals Experimental Study on the Effect of Offset Notch on Fracture Properties of Rock under Three-Point Bending Beam

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Qifeng Guo ◽  
Xinghui Wu ◽  
Meifeng Cai ◽  
Shengjun Miao
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Tensile Strength ◽  
Peak Load ◽  
Fracture Properties ◽  
Three Point Bending ◽  
Nominal Strength ◽  
Bending Load ◽  
The Relationship ◽  
Rock Beam

To investigate the effects of offset notch on the fracture properties of rock beam under bending load, granite beam specimens with “one single offset notch” and “central and offset double notches” are made. A series of three-point bending beam tests on the specimens are carried out by controlling the displacement rate of central notch. The whole load-displacement (P-CMOD) curves are obtained. Experimental results show that the larger the distance between the offset notch and beam central is, the larger are the peak load and nominal strength of the specimen. The peak load and nominal strength for the “central and offset double notches” specimens are both larger than those for the “single central notch” specimen. A fracture model considering the effect of offset notch is developed, and the relationship between the offset notch parameter, tensile strength, and fracture toughness is established.

Experimental Study of Diffusivity of the Interfacial Transition Zone between Cement Paste and Aggregate

2016 ◽  
Vol 28 (10) ◽  
pp. 04016109 ◽  
Author(s):  
Zhilu Jiang ◽  
Qinghua Huang ◽  
Yunping Xi ◽  
Xianglin Gu ◽  
Weiping Zhang
Keyword(s):  
Experimental Study ◽  
Transition Zone ◽  
Cement Paste ◽  
Interfacial Transition Zone

Effect of Cement Dosage on Selected Mechanical Fracture Parameters of Concretes

2014 ◽  
Vol 617 ◽  
pp. 239-242 ◽  
Author(s):  
Hana Šimonová ◽  
Ivana Havlíková ◽  
Petr Daněk ◽  
David Lehký ◽  
Barbara Kucharczyková ◽  
...  
Keyword(s):  
Fresh Concrete ◽  
Mechanical Fracture ◽  
Bending Tests ◽  
Fracture Properties ◽  
Three Point Bending ◽  
Fracture Parameters ◽  
Edge Notch

Mechanical fracture parameters obtained from three-point bending tests on concrete specimens with a central edge notch are introduced in this paper. A total of four sets of specimens were tested. The concrete used in each set differed in cement dosage, which ranged from 250 to 455 kg per m3of fresh concrete. Three specimens in each set were tested at the age of 28 days. Increasing the dosage of cement influences the mechanical fracture properties of concretes in both positive and negative ways.

Fracture properties of self-compacting fiber-reinforced concrete

2020 ◽  
Vol 11 (4) ◽  
pp. 112
Author(s):  
Mariam Farouk Ghazy ◽  
Metwally Abd Allah Abd Elaty ◽  
Omar Daboun
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Test Results ◽  
Fiber Reinforced ◽  
Bending Tests ◽  
Fracture Properties ◽  
Three Point Bending ◽  
Slump Flow ◽  
Hardened Properties ◽  
Application Fields

Self-compacting concrete (SCC) is an innovative concrete that does not necessitate vibration for placing and compaction. Nineteen concrete mixes were investigated including a control mix without fibers as well as eighteen SCC with fibers (SCFRC) mixes. Three types of fibers (polypropylene, glass and steel) were used. Slump flow, L-box, V-funnel as well as column segregation tests were conducted to assess the fresh properties. Whereas, compressive, splitting tensile and flexural strengths were measured to assess the hardened properties of SCFRC. Three point bending tests were performed for the purpose of assessing the fracture properties of SCFRC. Test results showed that the inclusion of fibers to produce SCFRC mixtures remarkably enhanced the fracture properties including fracture energy (Gf) and fracture toughness (K1c). Inclusion of steel fibers with 2% volume fractions showed an improvement with 26.9 times for Gf over the control mix. Whereas, 104% increase in K1c was recorded for the same mix over the mix without fibers. Adding fibers to SCC to produce self-compacting fiber reinforced concrete (SCFRC) will expand its advantages. However, the application fields still need to understand the properties of SCFRC.

Influence of Interfacial Transition Zone on Local and Overall Fracture Response of Cementitious Composites

2018 ◽  
Vol 784 ◽  
pp. 97-102 ◽  
Author(s):  
Vojtěch Zacharda ◽  
Jiří Němeček ◽  
Hana Šimonová ◽  
Barbara Kucharczyková ◽  
Michal Vyhlídal ◽  
...  
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Cement Matrix ◽  
Mechanical Fracture ◽  
Three Point Bending ◽  
Fine Grained ◽  
Bulk Matrix ◽  
Electron Microscopes ◽  
Microstructure Measurements ◽  
Good Agreement

Mechanical fracture properties of interfacial transition zone (ITZ) of fine-grained composite based on cement matrix with different types – basalt, granite, marble and amphibolite – of rock inclusion were studied. Specimens with the initial stress concentrator were tested in standard three-point bending configuration. Fracture surfaces were examined with light and electron microscopes. Local ITZ response was characterized by nanoindentation in the vicinity of rock inclusions. Local elasticity, hardness and viscous properties were assessed. It has been shown that the ITZ is mechanically weaker compared to the bulk matrix in the region of ca. 0–20 μm from the inclusion for all specimen’s types. It exhibits gradual increase of elastic modulus and hardness, which can be approximately expressed by a power law. On the other hand, the creep in ITZ was found to be higher compared to the bulk matrix. The results of nanoindentation measurements are in a good agreement with overall mechanical properties, fracture response and microstructure measurements done by scanning electron microscopy.

Sign in / Sign up

Export Citation Format

Share Document