Factors affecting the fresh-to-hardened concrete repair system

2022 ◽  
Vol 320 ◽  
pp. 126279
Author(s):  
Ahmed Fathy ◽  
Han Zhu ◽  
Mohamed Kohail
Keyword(s):  
Hardened Concrete ◽  
Repair System ◽  
Concrete Repair ◽  
Factors Affecting

scholarly journals Application of stress based NDT methods for concrete repair bond quality control

2015 ◽  
Vol 63 (1) ◽  
pp. 77-85 ◽  
Author(s):  
A. Garbacz
Keyword(s):  
Stress Waves ◽  
Test Method ◽  
Repair System ◽  
Repair Material ◽  
Bond Quality ◽  
Substrate Roughness ◽  
Concrete Repair ◽  
Factors Affecting ◽  
Field Assessment

Abstract Adhesion in repair systems is one of the most important factors affecting their durability. Elaboration of a reliable nondestructive test method to perform an adhesion mapping is one of the most important tasks. A majority of NDT methods applicable for the assessment of concrete structures are based on the propagation of various types of stress waves. In this paper, the influence of the repair material type (polymer-cement or polymer) and quality of the concrete substrate (roughness, microcracking, not cleaned surface) upon propagation of stress waves in a repair system was studied in view of developing a reliable NDT procedure for the field assessment of bond quality in concrete repairs.

Preliminary Study on the Bond Properties of the PDCC Concrete Repair System

2011 ◽  
Vol 23 (9) ◽  
pp. 1360-1364 ◽  
Author(s):  
Hong-Gang Zhu ◽  
Christopher K. Y. Leung ◽  
Qian Cao
Keyword(s):  
Repair System ◽  
Bond Properties ◽  
Concrete Repair ◽  
Preliminary Study

The Use of the Pull-Off Test Method to Characterize the Performance of a Concrete Repair System

2019 ◽  
Author(s):  
Evan Karunaratne ◽  
◽  
Julie Ann Hartell ◽  
Norbert Delatte
Keyword(s):  
Test Method ◽  
Repair System ◽  
Concrete Repair

Concrete repair system for highway viaduct pillars and a case history

2014 ◽  
Vol 102 (1) ◽  
pp. 3246-3256
Author(s):  
Marta Bovassi ◽  
Carlo Pistolesi ◽  
Pasquale Zaffaroni
Keyword(s):  
Case History ◽  
Repair System ◽  
Concrete Repair

scholarly journals Failure Modes in Concrete Repair Systems due to Ongoing Corrosion

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Mladena Luković ◽  
Branko Šavija ◽  
Guang Ye ◽  
Erik Schlangen ◽  
Klaas van Breugel
Keyword(s):  
Failure Modes ◽  
Substrate Surface ◽  
Surface Preparation ◽  
Concrete Cover ◽  
Warning Signs ◽  
Repair System ◽  
Repair Material ◽  
Concrete Repair ◽  
Repair Mortar ◽  
Repair Systems

Corrosion of steel reinforcement is the main cause of deterioration in reinforced concrete structures. It can result in cracking and spalling of the concrete cover. After the damaged cover is repaired, reinforcement corrosion might continue and even accelerate. While the development of the corrosion cell is difficult to control, the damage can be possibly delayed and controlled by use of a suitable repair material. The lattice fracture model is used in this paper to investigate the performance of strain hardening cementitious composite (SHCC) in concrete repair systems exposed to ongoing corrosion. Numerical results were verified by experimental tests when SHCC, nonreinforced material (repair mortar), and commercial repair mortar are used as repair materials. In experiments, reinforcement bars (surrounded by a repair material) were exposed to accelerated corrosion tests. The influence of the substrate surface preparation, the type of repair material, the interface, and the substrate strength on the resulting damage and failure mode of repair systems are discussed. In general, SHCC repair enables distributed cracking with small crack widths, up to several times smaller compared to repair mortar. Furthermore, more warning signs prior to the final failure are present in the SHCC repair system.

Moisture exchange in concrete repair system captured by X-ray absorption

2015 ◽  
pp. 35-36 ◽  
Author(s):  
M. Lukovic ◽  
E. Schlangen ◽  
G. Ye ◽  
K. Van Breugel
Keyword(s):  
Repair System ◽  
Concrete Repair ◽  
Moisture Exchange ◽  
X Ray ◽  
X Ray Absorption

scholarly journals On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

2017 ◽  
Vol 134 ◽  
pp. 311-323 ◽  
Author(s):  
Andrzej Garbacz ◽  
Tomasz Piotrowski ◽  
Luc Courard ◽  
Lesław Kwaśniewski
Keyword(s):  
Signal Analysis ◽  
Repair System ◽  
Echo Signal ◽  
Concrete Repair ◽  
Interface Quality ◽  
Impact Echo

Application of Non-Destructive Methods for Quality Control of Concrete Repair Efficiency

2015 ◽  
Vol 1129 ◽  
pp. 28-38 ◽  
Author(s):  
Andrzej Garbacz
Keyword(s):  
Quality Control ◽  
Nondestructive Method ◽  
Stress Wave Propagation ◽  
Repair System ◽  
Bond Quality ◽  
Concrete Repair ◽  
Repair Efficiency ◽  
Standards And Guidelines ◽  
The Many ◽  
Non Destructive

Adhesion in this system is one of the most important factors that affect the reliability and durability of repair. According to the many standards and guidelines, e.g. new European Standard EN 1504-10 and ACI Concrete Repair Manual, a pull-off test is recommended for assessment of a bond quality in repair systems. The use of pull-off test, due to its semi-destructive character, is restricted by owners and managers. Therefore, the elaboration of reliable nondestructive method for an adhesion mapping could provide a quite advantageous alternative. Repair system is difficult to test with NDT methods, because of the many factors influencing the stress wave propagation. In this paper the possibility of application of various NDT methods for quality control of repair efficiency, including estimation of the bond strength, is discussed.

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