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.

UHPFRC as Repair Material for Fire-Damaged Reinforced Concrete Structure – A Review

2015 ◽  
Vol 802 ◽  
pp. 283-289 ◽  
Author(s):  
Muhd Afiq Hizami Abdullah ◽  
Mohd Zulham Affandi Mohd Zahid ◽  
Badorul Hisham Abu Bakar ◽  
Fadzli Mohamed Nazri ◽  
Afizah Ayob
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
High Performance ◽  
Steel Fibre ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Repair Material ◽  
Reinforced Concrete Structure ◽  
Normal Concrete ◽  
High Performance Fiber

Exposure of concrete to intense heat will cause deterioration of its strength and durability. Previously, the fire-damaged concrete was repaired using the shotcrete and normal concrete. Recent studies utilize fibre reinforced polymer (FRP) in repairing fire-damaged concrete. Ultra High Performance Fiber Reinforced Concrete (UHPFRC) mostly developed using fine size aggregate, cement, silica fume, super plasticizer and reinforced with steel fibre has an excellent mechanical properties compared to high strength concrete and with an addition of steel fibre in the UHPFRC enhances its ductility behaviour which is not possessed by normal concrete, hence, UHPFRC indicates a promising candidate as repair material to fire-damaged concrete. The aim of this paper is to review on the properties of UHPFRC to be utilized as repair material to fire-damaged concrete structure based on previous research on UHPFRC and fire-damaged structure.

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 Tropical Climate Condition to Compressive Strength and Microstructure Properties of High Performance Fiber Reinforced Reinforced Concrete (HPFRC)

2015 ◽  
Vol 1115 ◽  
pp. 182-187 ◽  
Author(s):  
Siti Asmahani Saad ◽  
Farah Nora Aznieta Abdul Aziz ◽  
Maisarah Ali
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
High Performance ◽  
Tropical Climate ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Climate Condition ◽  
Steam Curing ◽  
High Performance Fiber ◽  
Curing Method

Additional of fiber in concrete creates fiber reinforced concrete (FRC) with an improvement of the mechanical properties of the concrete. However, fiber incorporation in FRC is limited to 2% to allow normal mixing procedure. To address this issue, high performance fiber reinforced concrete (HPFRC) is introduced and it is relatively new in construction industry. Since very limited information on its capacity in tropical climate condition exposure, this research focuses on investigation of compressive strength and microstructure properties of the produced concrete in tropical climate condition. In order to complete this research, grade 80 cement slurry is used with 3%, 4% and 5% hooked-end steel fiber. Total numbers of 56 samples which are divided into 4 sets and exposed to two different curing methods namely water curing method and steam curing method at 80°C. Out of the 4 sets, 2 sets are exposed to tropical climate condition using climatic chamber at 80% relative humidity (RH) and constant temperature of 35°C for 30 days. Compression and ultrasonic pulse velocity (UPV) tests are carried out at 28 days to identify its strength as well as integrity of the concrete produced. Scanning electron microscopy (SEM) analysis is done to ascertain the microstructure properties of HPFRC. The highest compressive strength of 152.2 MPa was recorded for steam curing samples after exposed to tropical climate condition for 30 days with 5% steel fiber volume.

Potential Use of Ultra High-Performance Fibre-Reinforced Concrete as a Repair Material for Fire-Damaged Concrete in Terms of Bond Strength

2020 ◽  
Vol 12 (9) ◽  
Author(s):  
Nur Khaida Baharuddin ◽  
◽  
Fadzli Mohamed Nazri ◽  
Badorul Hisham Abu Bakar ◽  
Salmia Beddu ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Bond Strength ◽  
High Performance ◽  
Structural Integrity ◽  
Strength Loss ◽  
Fiber Reinforced Concrete ◽  
Repair Material ◽  
Future Studies ◽  
Potential Use ◽  
High Performance Fibre

The strength of concrete structures deteriorates after exposure to fire. Strength loss varies with elevated temperature, fire duration, and the mechanical properties of concrete. Repairing and strengthening affected structures are important to improve their performances. Fire-damaged concrete has been repaired using fiber-reinforcing polymer. The superior properties of ultrahigh performance fiber-reinforced concrete (UHPFRC) make it suitable as a repair material. Furthermore, an excellent repair material should be able to bond properly with the substrate and maintain its structural integrity. The aim of this paper is to review the potential use of UHPFRRC as a repair material for fire-damaged concrete in terms of bond strength. Previous studies showed that developing efficient rehabilitation techniques that enable fire-damaged structures to be restored has some challenges. Whether UHPFRC can be used as a repair material particularly for fire-damaged concrete structure is recommended to be proven in future studies.

Influence of technological factors on the properties of ultra-high-performance fiber reinforced concrete

2020 ◽  
pp. 135-147
Author(s):  
Igor Chilin ◽  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Technological Factors ◽  
High Performance Fiber

Приведены результаты исследований и выполнена оценка влияния технологических факторов на реологические свойства самоуплотняющихся сталефибробетонных смесей, определены кратковременные и длительные физико-механические и деформативные характеристики сверхвысокопрочного сталефибробетона, включая определение его фактической морозостойкости.

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