Experimental Research on Interfacial Bond Performance in Rock Anchor with High-Performance Grouting Medium

Abstract:

There exist the problems such as low bond strength and bad durability in the ordinary grouting slurry of the ground anchor system at present. The high-performance grouting mediums RPC (Reactive Powder Concrete) and DSP (Densified Systems containing homogeneously arranged ultrafine Particles) would become the potential replacement of grouting medium in ground anchor resulting from their high compressive strength, durability and toughness. Based on a series of pull-out tests on ground anchors with different high-performance grouting medium of RPC and DSP , different bond length in the construction field, the bond performance on the interfaces between anchor bolt (deformed steel bar) and grouted medium as well as between grouted medium and rock mass was studied. The results indicate that the interfacial bond strength between RPC or DSP and deformed steel bolt ranges within 23-31Mpa, far greater than that (about 2-3MPa) between the ordinary cementitious grout and deformed steel bar. Even though the interfacial bond strength between the grouted medium and rock mass of limestone was not obtained in the test since the failure mode was pull-out of those steel bar rather than the interface shear failure between grouted medium and rock mass, the bond stress on the interface reached 6.2-8.38 MPa, also far greater than the bond strength (about 0.1-3MPa) between the ordinary cementitious slurry and rocks.

• Periodical: Key Engineering Materials (Volume 517)
• Pages: 932-938
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.517.932
• Online since: June 2012
• Authors: Zhi Fang, Hong Qiao Zhang
• Keywords: Bond Performance, Digital Signal Processor (DSP), Experimental Investigation, High-Performance Materials, Rock Anchor, RPC

References

[1] QIAN F. Research on grouting material DSP properties[D]. Changsha: Hunan University, 2009. (In Chinese).

[2] QU W J, QIN Y H. A Review of study and application of reactive powder concrete(RPC) [J]. Structural Engineers, 2007, 23(5): 86-92. (In Chinese).

[3] CECS 22: 2005, China Association for Engineering Construction Standardization. Technical specification for ground anchors[S]. 2005: 23. (In Chinese).

[4] RAO X Y, TANG S M, ZHANG Y X. Experimental study on mixture ratios of grouting material for improvement of pull-out behaviors of rock cables[J]. Chinese Journal of Rock Mechanics and Engineering , 2008, 27(2): 390-395. (In Chinese).

[5] ZHANG F M, LIU N, CHEN Z Y. Determination of cohesive strength and length of the grouted part of prestressed cables [J]. ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES, 2002, 22(3): 1-3. (In Chinese).

[6] LI F Y, ZHAO R D. The bond-slip behaviors between different strength concrete and deformed reinforcing bars [J]. Industry Construction. 2002. 32(10): 31-33. (In Chinese).

[7] FANG Z,Y. Study and application of FRP and RPC in civil engineering[J]. JOURNAL OF RAILWAY SCIENCE AND ENGINEERING, 2005, 2(4): 54-61. (In Chinese).

[8] HUANG Z Y, QIAN F. Research on the comprehensive properties of early-strength and high-strength grouting materials based on DSP principle[J]. Journal of Hunan University: Natural Sciences, 2009. 36(8). (In Chinese).

[9] ZHANG F M, CHEN Z Y, LIU N. Determination of cohesive strength between rock mass and anchors[J]. Rock and Soil Mechanics, 2001, 22(4). (In Chinese).

[10] LONG W X, ZHOU Y, TAN H H. Experiment and research on anchor grouting material admixed with polypropylene fiber[J]. China Harbour Engineering. 2003-6. (In Chinese).

[11] Richard P, Cheytezy M. Reactive powder concrete with high ductility and 200-800 MPa compressive strength[J]. ACISp144, 1997: 507-518.

DOI: 10.14359/4536