Effect of sand grain size and sand-to-cement ratio on the interfacial bond strength of steel fibers embedded in mortars

2013 ◽  
Vol 47 ◽  
pp. 1421-1430 ◽  
Author(s):  
Seok Hee Kang ◽  
Jung Jin Kim ◽  
Dong Joo Kim ◽  
Young-Soo Chung
Keyword(s):  
Grain Size ◽  
Bond Strength ◽  
Steel Fibers ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Cement Ratio ◽  
Sand Grain Size

Performance Properties of Polymer Modified Cement Grouts for Repair and Rehabilitation of Concrete Pavement

2010 ◽  
Vol 146-147 ◽  
pp. 345-348
Author(s):  
Shui Zhang ◽  
Guo Zhong Li ◽  
Chao Ning ◽  
Hai Yan Yuan
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Concrete Pavement ◽  
Strength Increase ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Cement Ratio ◽  
Ethylene Copolymer ◽  
Cement Grouts ◽  
Gap Width

This study was conducted to evaluate the groutability and interfacial bond strength of polymer modified cement grouts (PMCG) for repair and rehabilitation of concrete pavement with different polymer/cement ratio. The groutability of grouts was studied through the cone-shaped gap test and the grouted minimum gap width was determined. The interfacial bond strength, such as flexural and shear bond strength were measured. The experimental results indicate that the groutability of grouts modified by vinyl acetate/ethylene copolymer (EVA) improves obviously and the grouted minimum gap width decreases. The flexural and shear bond strength increase 32.41% and 122.92% when the polymer/cement ratio is 10%, at the ages of 28 days respectively. The microstructure of repair interface was observed and analyzed by using scanning electron microscope, and the modification mechanism of EVA latex was discussed.

Experimental Study on Bond Strength between Polymer-Modified Concrete and Plain Concrete

2014 ◽  
Vol 1030-1032 ◽  
pp. 1104-1107
Author(s):  
Xin Le Zhang ◽  
Xiao Hui Guo ◽  
Hai Cao
Keyword(s):  
Experimental Study ◽  
Bond Strength ◽  
Plain Concrete ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Cement Ratio ◽  
Designed Experiments ◽  
Good Adhesive ◽  
Polymer Modified Concrete ◽  
Better Than

Polymer-modified concrete is widely used for the rehabilitation of old damaged structures mainly due to its good adhesive performance. The interfacial bond strength between polymer-modified concrete and plain concrete should be measured carefully in order to keep both sides work together. To overcome problems existed in the test of bond strength between two types of concretes, a split apparatus was designed. Experiments on bond strength between plain concrete and polymer-modified concrete with different polymer contents and different interfacial treatments were conducted utilizing the newly devised apparatus, and a series of complete and correct results were obtained. The experimental results indicate that when the surface is treated with 10% polymer solution, the bond strength between plain concrete and polymer-modified concrete with polymer-cement ratio at 15% is better than those in other cases.

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

2012 ◽  
Vol 517 ◽  
pp. 932-938 ◽  
Author(s):  
Zhi Fang ◽  
Hong Qiao Zhang
Keyword(s):  
Rock Mass ◽  
Bond Strength ◽  
High Performance ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Bond Performance ◽  
Pull Out ◽  
Steel Bar ◽  
Reactive Powder ◽  
Ground Anchor

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.

scholarly journals A Special Single-Fibre Pull-Out Technique for Determining the Fiber/Cement Interfacial Bond Strength

2002 ◽  
Vol 11 (1) ◽  
pp. 096369350201100 ◽  
Author(s):  
J. M. Caceres ◽  
A. N. Netravali
Keyword(s):  
Shear Strength ◽  
Bond Strength ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Specimen Geometry ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Pull Out ◽  
Fibre Cement

The paper discusses a simple specimen geometry to obtain the fibre/cement interfacial shear strength (IFSS). The specimens are easy to prepare and easy to test. The technique gives reliable and reproducible results. IFSS results for five different fibres with cement were measured. Most IFSS values obtained are in the range of 0.15 to 1.5 MPa. Despite the simplicity of the technique presented in this study, the results are in agreement with those obtained by several other researchers using different techniques and specimen geometry.

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