Evaluation and Performance of Repair Materials for Rehabilitation of Concrete Structures

Khan, Mohammad Iqbal; Almusallam, Tarek H.; Almosa, Abdulaziz a.; Alsayed, Saleh H.; Al Salloum, Yousef A.

doi:10.4028/www.scientific.net/AMR.163-167.3820

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Experimental Investigation on the Anchorage Mechanics of Anchorage Cable of the late Model with the Pressure Uniform
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Mechanical Behavior of FRP-Confined Rectangular Concrete Column
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Study on Development Strategy of University’s Architectural Design Enterprise
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On the Relationship between Deteriorated Level of ASR Damaged Concrete and Lithium Migration from Acceleration Lithium Migration Technique Test
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Evaluation and Performance of Repair Materials for Rehabilitation of Concrete Structures
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Study on Stress-Strain Relationship of FRP-Confined Concrete Filled Steel Tubes
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Axial Compressive Behavior of CFRP-Confined Concrete Columns Subject to Short-Term Preloading
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Local Stiffening of Steel I-Beams by Using CFRP Materials
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Comparing the Use of CFRP Laminates with Light Gauge Galvanized Steel Plates in Structural Strengthening of Beams Subjected to Flexural Loading
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Home Advanced Materials Research Advances in StructuresEvaluation and Performance of Repair Materials for...

Evaluation and Performance of Repair Materials for Rehabilitation of Concrete Structures

Abstract:

The most common form of rehabilitation for a deteriorated structure is to remove the deteriorated concrete and replace it with a new material, thus increasing the design life of the structure. Good adhesion of a repair material to concrete is of vital importance in the application and performance of concrete repairs. A major factor that influences the durability of the repair is the bond strength between the new material and the substrate. In this investigation, the most common repair materials, produced by international reputed manufactures, available in the local market were selected from cementitious repair mortars and cementitious polymer modified mortars. The performance of these materials were evaluated in terms of compressive strength, tensile strength, bond strength in tension and bond strength in modulus of rupture.

Info:

Periodical:

Advanced Materials Research (Volumes 163-167)

Main Theme:

Advances in Structures

Edited by:

Lijuan Li

Pages:

3820-3825

DOI:

10.4028/www.scientific.net/AMR.163-167.3820

Citation:

M. I. Khan et al., "Evaluation and Performance of Repair Materials for Rehabilitation of Concrete Structures", Advanced Materials Research, Vols. 163-167, pp. 3820-3825, 2011

Online since:

December 2010

Authors:

Mohammad Iqbal Khan, Tarek H. Almusallam, Abdulaziz a. Almosa, Saleh H. Alsayed, Yousef A. Al Salloum

Keywords:

Bond Strength, Compressive Strength, Concrete Structure, Modulus of Rupture, Polymer Modified, Rehabilitation, Repair Material, Tensile Strength

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References

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Paper TitlePages

Study on the Bond and Anti-Abrasion Performance of Repair Materials for Hydraulic Concrete

Authors: Chao Hua Jiang, T.J. McCarthy, D. Chen, Q.Q. Dong

Abstract: The bond and anti-abrasion performance of repair materials are the key factors for successful repair of hydraulic concrete. Acrylic acid emulsion (AAE) mortar, silica fume (SF) mortar, high strength (HS) mortar, polypropylene (PP) fiber mortar and basalt fiber (BF) mortar were prepared and their direct tensile bond strength, splitting tensile bond strength, abrasion resistance and SEM analysis of bond interface are studied in this paper. The results show that the highest direct tensile bond strength was recorded for fiber mortar. But compared to homogenous specimen’s tensile strength, AAE mortar showed the highest direct tensile bond strength. The anti-abrasion properties of repair mortars were tested with decreasing performance recorded in the following order: PP fiber mortar, SF mortar, BF mortar, HS mortar and AAE mortar. Compared with the HS mortar without fiber, the wear rate of PP fiber mortar was decreased by 29.2 % and the anti-abrasion strength was increased by 37.7%. This shows that adding fiber can greatly improve the anti-abrasion property. SEM analysis showed that addition of PP fiber and BF into repair mortar did not change the type of hydrates. The interface of AAE mortar was level and dense. The bond interface of SF mortar was uniform without big porosity. Addition of super plasticizer, the bond interface of HS mortar presented a large quantity of fibrous the CSH gel and less porosity which could improve the mortar bond effect effectively.

403

Fiber-Reinforced Rapid Repair Material for Concrete Pavement

Authors: Jing Zhao, Ting Song

Abstract: The main problems of repair materials for concrete pavement are big shrinkage and weak bond etc. The rapid repair material discussed in this paper is concrete with compound early-strength admixture. Its compressive strength and flexural strength (1d) is up to 23.1MPa and 3.74MPa respectively, which meets open to traffic demand in one day. Repair materials mixed with alkali-proof glass fiber or polypropylene fiber mesh were studied. Flexural strength and interfacial bond strength increased, shrinkage value reduced when fiber was blended. The results indicate that there is a strong linear correlation between splitting strength of repair material and bond strength.

870

An Experiment on Bond Properties of Reinforcements Embedded in Ultra High Performance Concrete

Authors: Jee Sang Kim, Jong Ho Park

Abstract: Researches on Ultra High Performance Concrete (UHPC) have been conducted worldwide owing to its outstanding durability and strength performances compared to normal concrete. This paper experimentally investigates the bond properties of reinforcements embedded in UHPC using direct pull-out tests. The specimens were prepared for various compressive strength levels of 120, 150, and 180MPa, diameters of reinforcements of 13, 16, 19, 22 and 25mm, cover to bar diameter ratios and bonded lengths. The influences of each test variable on bond properties are examined and may be a useful data for design and analysis of UHPC structures.

323

Experimental Analysis on Bond Behavior of GFRCM Applied on Clay Brick Masonry

Authors: Marianovella Leone, Valeria Rizzo, Francesco Micelli, Maria Antonietta Aiello

Abstract: External bonded reinforcements (EBR), made by fibrous meshes embedded in a cementitious/hydraulic lime mortar, are getting a great deal of attention, mostly for strengthening, retrofitting and repair existing structures. In this context, the interest versus the FRCM (Fiber Reinforced Cementitious Matrix) is growing. The mechanical performance of these mortar-based reinforcements is not well known at the date and it needs to be investigated in terms of bond and tensile strength, strain and stiffness, in relation to the type of both substrate and fibers. The present work reports the results of an experimental study, still in progress, on different pre-cured GFRP grids embedded in inorganic matrices and applied on clay brick masonry. First, the mechanical properties of both pre-cured GFRP grid and GFRCM reinforcements were obtained through tensile tests. Then, the experimental investigation on bond behavior was carried out by direct shear bond test. The test results were collected and processed to evaluate bond strength, failure mode, load-slip relationship.

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