Bond strength of the interface between normal concrete substrate and GUSMRC repair material overlay

2019 ◽  
Vol 216 ◽  
pp. 261-271 ◽  
Author(s):  
S.H. Abo Sabah ◽  
M.H. Hassan ◽  
N. Muhamad Bunnori ◽  
M.A. Megat Johari
Keyword(s):  
Bond Strength ◽  
Repair Material ◽  
Normal Concrete

scholarly journals Evaluation of bond strength between normal concrete and high performance fiber reinforced concrete (HPFRC)

2018 ◽  
Vol 195 ◽  
pp. 01015
Author(s):  
Nur Adibah Ayuni Abd Malek ◽  
Khairunnisa Muhamad ◽  
Mohd Zulham Affandi Mohd Zahid ◽  
Nur Ain Hamiruddin ◽  
Norrazman Zaiha Zainol ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Bond Strength ◽  
High Performance ◽  
Surface Preparation ◽  
Fiber Reinforced Concrete ◽  
Repair Material ◽  
Normal Concrete ◽  
High Performance Fiber ◽  
Water Curing ◽  
Curing Method

High Performance Fiber Reinforced Concrete (HPFRC) has been proposed to be used as a repair material for the deterioration of concrete structure since its very low porosity that leads to a low permeability and high durability. This characteristic makes it suitable for rehabilitation and retrofitting reinforced concrete structures or for as a new repair material. The bond strength between HPFRC and old concrete should have a good bond strength, thus surface preparation method and curing method can help strengthen the bond strength between HPFRC and normal concrete. This paper was performed to study the effect of surface preparation and curing method on the bond strength between HPFRC and normal concrete. In this study, three surface preparations were prepared: sandblasting, grooved and drill hole. Then, the curing methods that were performed in this study are ambient curing and water curing. The tests that were conducted to evaluate the bond strength between HPFRC and normal concrete are slant shear test and splitting tensile test. The result from this study shows that sandblasting gave the highest bond strength result between normal concrete and HPFRC. For the curing method, water curing gives the highest bond strength between normal concrete and HPFRC.

Evaluation of bond strength between fire-damaged normal concrete substance and ultra-high-performance fiber-reinforced concrete as a repair material

2016 ◽  
Vol 13 (5) ◽  
pp. 461-466 ◽  
Author(s):  
Nur Khaida Baharuddin ◽  
Fadzli Mohamed Nazri ◽  
Ramadhansyah Putra Jaya ◽  
Badorul Hisyam Abu Bakar
Keyword(s):  
Bond Strength ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Repair Material ◽  
Interfacial Bond ◽  
Normal Concrete ◽  
Content Type ◽  
Surface Moisture ◽  
High Performance Fiber ◽  
Moisture Conditions

Purpose This study aims to investigate and compare the interfacial bond characteristics between fire-damaged normal concrete substrate and ultra-high-performance fiber-reinforced concrete (UHPFRC) as a repair material. Design/methodology/approach First, fire-damaged normal concrete was prepared. Then, with a cast surface, the substrate was subjected to different surface moisture conditions. Three types of moisture conditions were set, namely, air dry, saturated surface dry (SSD) and wet. Slant shear and splitting cylinder tests were conducted to determine the interfacial bond strength of the composite. Findings In general, results indicate that surface moisture conditions significantly influence bond strength. The substrate under SSD condition exhibited the highest bond strength. The findings suggest that UHPFRC is a promising material for the repair and reuse of fire-damaged concrete structures. Originality/value This study compares the bond strength between fire-damaged normal concrete and UHPRC.

scholarly journals Effect of Sodium Hypochlorite on Push-out Bond Strength of Four Calcium Silicate-based Endodontic Materials when used for repairing Perforations on Human Dentin: An in vitro Evaluation

2017 ◽  
Vol 18 (4) ◽  
pp. 289-294 ◽  
Author(s):  
Sara A Alsubait
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Calcium Silicate ◽  
Statistical Significance ◽  
Control Group ◽  
Scanning Electron Microscopy Data ◽  
Repair Material ◽  
Human Dentin ◽  
Push Out

ABSTRACT Aim This study aimed to evaluate the push-out bond strength of NeoMTA Plus (NMTA), EndoSequence root repair material fast set putty (ERRMF), biodentine (BD), and ProRoot white mineral trioxide aggregate (PMTA) when used as perforation repair materials after exposure to 2.5% sodium hypochlorite (NaOCl) during the early setting phase. Materials and methods Horizontal midroot sections were prepared from single-rooted human teeth. Sections (n = 144) were randomly divided into four groups: PMTA, BD, NMTA, and ERRMF. Materials were condensed and allowed to set for 10 minutes. The groups were further divided into two subgroups. The NaOCl group included specimens that were immersed in 2.5% NaOCl for 30 minutes, and the control group included specimens on which a wet cotton pellet was placed over the test material. After 48 hours, the highest force applied to the materials at the time of dislodgement was recorded. Slices were then examined under a digital microscope to evaluate the nature of the bond failure. The surfaces of two specimens from each subgroup were observed by scanning electron microscopy. Data were statistically analyzed with two-way and one-way analysis of variances, independent t-tests, and chi-square tests. The statistical significance was set at 0.05. Results In NaOCl-treated groups, PMTA showed a significantly higher push-out bond strength than the other three materials (p = 0.00). In the control groups, the bond strength of BD was significantly higher than that of PMTA, ERRMF, and NMTA (p < 0.05). Compared with the control group, NaOCl treatment significantly increased the push-out bond strength of PMTA (p = 0.00) and ERRMF (p = 0.00) and significantly reduced the bond strength of BD (p = 0.00) and NMTA (p = 0.03). None of the specimens showed an adhesive type of failure. The majority of the samples exhibited a cohesive failure type. Morphological observations revealed that the surfaces exhibited cubic crystals. In ERRMF, the crystals were few in number. Sodium hypochlorite enhanced the crystallization of NMTA. Conclusion The push-out bond strengths of PMTA and ERRMF were significantly increased after exposure to 2.5% NaOCl in the early setting phase, and those of BD and NMTA were significantly decreased. Clinical Significance The results of the present study suggest that early exposure of NaOCl increase the push-out bond strength of PMTA and ERRMF. PMTA had the highest push-out values. Therefore, it would be a potentially useful perforation repair material for single visit endodontic treatment. How to cite this article Alsubait SA. Effect of Sodium Hypochlorite on Push-out Bond Strength of Four Calcium Silicate-based Endodontic Materials when used for repairing Perforations on Human Dentin: An in vitro Evaluation. J Contemp Dent Pract 2017;18(4):289-294.

scholarly journals Eco-UHPC as Repair Material—Bond Strength, Interfacial Transition Zone and Effects of Formwork Type

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5778
Author(s):  
Ankit Kothari ◽  
Magdalena Rajczakowska ◽  
Thanyarat Buasiri ◽  
Karin Habermehl-Cwirzen ◽  
Andrzej Cwirzen
Keyword(s):  
Bond Strength ◽  
Transition Zone ◽  
Autogenous Shrinkage ◽  
Surface Friction ◽  
Pulse Velocity ◽  
Interfacial Transition Zone ◽  
Repair Material ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Normal Strength

A reduced carbon footprint and longer service life of structures are major aspects of circular economy with respect to civil engineering. The aim of the research was to evaluate the interfacial bond properties between a deteriorated normal strength concrete structure and a thin overlay made of Eco-UHPC containing 50 wt% of limestone filler. Two types of formwork were used: untreated rough plywood and surface treated shuttering plywood. The normal strength concrete elements were surface scaled using water jets to obtain some degradation prior to casting of the UHPC overlay. Ultrasonic pulse velocity (UPV), bond test (pull-off test), and Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectrometry (EDS) were used for analysis. Elements repaired with the Eco-UHPC showed significantly improved mechanical properties compared to the non-deteriorated NSC sample which was used as a reference. The bond strength varied between 2 and 2.7 MPa regardless of the used formwork. The interfacial transition zone was very narrow with only slightly increased porosity. The untreated plywood, having a rough and water-absorbing surface, created a surface friction-based restraint which limited microcracking due to autogenous shrinkage. Shuttering plywood with a smooth surface enabled the development of higher tensile stress on the UHPC surface, which led to a more intensive autogenous shrinkage cracking. None of the formed microcracks penetrated through the entire thickness of the overlay and some were partly self-healed when a simple water treatment was applied. The project results showed that application of UHPC as repair material for concrete structures could elongate the lifespan and thus enhance the sustainability.

scholarly journals The Comparison of Bond Strength between Geopolymer Concrete and OPC Concrete for Plain Reinforcing Bars

2018 ◽  
Vol 159 ◽  
pp. 01017 ◽  
Author(s):  
Nuroji ◽  
Daniel Herdian Primadyas ◽  
Ilham Nurhuda ◽  
Muslikh
Keyword(s):  
Bond Strength ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Reinforcing Bars ◽  
Normal Concrete ◽  
Steam Power ◽  
Bond Behavior ◽  
Pull Out ◽  
Concrete Blocks ◽  
Class F Fly Ash

This paper describes the research on bond behavior of plain reinforcing bars in geopolymer and normal concrete. The geopolymer concrete in this research was made of class F fly ash taken from Tanjung Jati Electric Steam Power Plant (PLTU) with Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) as alkaline activator, added in the mixture. The effect of bar size was studied by varying the bar diameter in range 10 mm to 19 mm. Each bar was casted in the center of concrete blocks made of geopolymer as well as normal concrete. Pull-out tests were carried out to the specimens that have reached 28 days of age. The test results show that the bond behavior of geopolymer concrete differs substantially from normal concrete, where geopolymer concrete has a higher bond strength when compared to normal concrete with identical concrete strengths.

scholarly journals The push-out bond strength of BIOfactor mineral trioxide aggregate, a novel root repair material

2019 ◽  
Vol 44 (1) ◽  
Author(s):  
Makbule Bilge Akbulut ◽  
Durmus Alperen Bozkurt ◽  
Arslan Terlemez ◽  
Melek Akman
Keyword(s):  
Bond Strength ◽  
Mineral Trioxide Aggregate ◽  
Repair Material ◽  
Root Repair ◽  
Push Out
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