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.

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.

scholarly journals Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 63
Author(s):  
Anna L. Mina ◽  
Michael F. Petrou ◽  
Konstantinos G. Trezos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Depth Of Penetration ◽  
Projectile Impact ◽  
High Performance Fiber

The scope of this paper is to investigate the performance of ultra-high performance fiber reinforced concrete (UHPFRC) concrete slabs, under projectile impact. Mixture performance under impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. The UHPFRC, used in this study, consists of a combination of steel fibers of two lengths: 6 mm and 13 mm with the same diameter of 0.16 mm. Six composition mixtures were tested, four UHPFRC, one ultra-high performance concrete (UHPC), without steel fibers, and high strength concrete (HSC). Slabs with thicknesses of 15, 30, 50, and 70 mm were produced and subjected to real shotgun fire in the field. Penetration depth, material volume loss, and crater diameter were measured and analyzed. The test results show that the mixture with a combination of 3% 6 mm and 3% of 13 mm length of steel fibers exhibited the best resistance to projectile impact and only the slabs with 15 mm thickness had perforation. Empirical models that predict the depth of penetration were compared with the experimental results. This material can be used as an overlay to buildings or to construct small precast structures.

scholarly journals Implementation of Highly-Flowable Strain Hardening Fiber Reinforced Concrete in New RC Beam-Column Joints

2018 ◽  
Vol 147 ◽  
pp. 01003
Author(s):  
Wen-Cheng Liao ◽  
Wei-Ru Su
Keyword(s):  
Reinforced Concrete ◽  
Strain Hardening ◽  
Life Cycle Cost ◽  
High Performance ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Building Systems ◽  
Rc Building ◽  
High Performance Fiber

The purpose of New RC project was aimed to reduce the member sections and increase the available space of high rise buildings by using high strength concrete (f’c > 70 MPa) and high strength rebars (fy > 685 MPa). Material consumptions and member section sizes can be further reduced owing to the upgrade of strength. However, the nature of brittleness of high strength may also cause early cover spalling and other ductility issues. Addition of steel fibers is an alternative as transverse reinforcement. Highly flowable strain hardening fiber reinforced concrete (HF-SHFRC) has excellent workability in the fresh state and exhibits the strain-hardening and multiple cracking characteristics of high performance fiber reinforced cementitious composites (HPFRCC) in their hardened state. The objective of this study is to investigate the feasibility of implementing HF-SHFRC in New RC building systems, particularly for beam-column joints as an alternative of transverse reinforcements. Four full-scale exterior beam-column joints, including two specimens with intensive transverse reinforcements and two specimens made of HF-SHFRC without any stirrup, are tested. Test results show that the HF-SHFRC specimens perform as well as specimens with intensive transverse reinforcements regarding failure mode, ductility, energy dissipation and crack width control. Integration of New RC building systems and HF-SHFRC can assuring construction qualities and further diminish labor work and give infrastructure longer service life, and eventually lower the life-cycle cost.

scholarly journals Performance Comparison between Densified and Undensified Silica Fume in Ultra-High Performance Fiber-Reinforced Concrete

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3901 ◽  
Author(s):  
Sung-Hoon Kang ◽  
Sung-Gul Hong ◽  
Juhyuk Moon
Keyword(s):  
Reinforced Concrete ◽  
Silica Fume ◽  
High Performance ◽  
High Strength ◽  
Performance Comparison ◽  
Fiber Reinforced Concrete ◽  
Hydration Reaction ◽  
Fiber Reinforced ◽  
Dust Generation ◽  
High Performance Fiber

Silica fume (SF) is a key ingredient in the production of ultra-high performance fiber-reinforced concrete (UHPFRC). The use of undensified SF may have an advantage in the dispersion efficiency inside cement-based materials, but it also carries a practical burden such as high material costs and fine dust generation in the workplace. This study reports that a high strength of 200 MPa can be achieved by using densified SF in UHPFRC with Portland limestone cement. Additionally, it was experimentally confirmed that there was no difference between densified and undensified SFs in terms of workability, compressive and flexural tensile strengths, and hydration reaction of the concrete, regardless of heat treatment, because of a unique mix proportion as well as mixing method for dispersing agglomerated SF particles. It was experimentally validated that the densified SF can be used for both precast and field casting UHPFRCs with economic and practical benefits and without negative effects on the material performance of the UHPFRC.

EXPERIENCE IN USING ULTRA HIGH PERFORMANCE FIBER REINFORCED CONCRETE ELEMENTS

2021 ◽  
pp. 41-50
Author(s):  
Maxim MARCHENKO ◽  
Igor CHILIN ◽  
Nikita SELYUTIN
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
High Performance ◽  
Economic Effect ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Common Solution ◽  
Flexural Tensile Strength ◽  
High Performance Fiber

The article presents examples of the use of ultra-high performance fiber reinforced concrete for load-bearing structures in Russia. Using this material with limits of compressive strength 150 MPa, flexural tensile strength 21 MPa, tensile strength 8.5 MPa, external post-tensioned structures of bridges and tanks are made instead of common solution with the steel anchors. Full-scale tests of anchors were carried out, which did not reveal signs of deformations and destruction of elements during the tension of strands, at the level of design and ultimate loads - before strands rupture. It was concluded that it is advisable to replace steel anchors with anchors from the material, which, with high strength characteristics, has ultra-low permeability and high frost resistance corresponding to the F21000 class. The estimated economic effect of such a replacement is determined by the reduced cost of these elements of structures made of ultra-high performance fiber reinforced concrete in comparison with steel.

Restoration of a historic reinforced concrete structure with Ultra-High Performance Fiber Reinforced Concrete

2019 ◽  
Author(s):  
Borja Herraiz ◽  
Henar Martin-Sanz ◽  
Nadja Wolfisberg
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Experimental Tests ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Reinforced Concrete Structure ◽  
Art Deco ◽  
Federal Institute ◽  
High Performance Fiber ◽  
Institute Of Technology

<p>The historic building "Du Pont" in Zurich, Switzerland, was constructed between 1912 and 1913 by the Swiss architects Haller &amp; Schindler and it is listed as a cultural heritage object, including not only the Art Deco façade, but also the ground-breaking structure of reinforced concrete. The building includes several structural particularities, such as the slender, reinforced concrete, one-way ribbed slabs, a reinforced concrete truss structure in the roof hanging four floors and three transfer beams on the ground floor diverting the loads from the seven upper floors. This paper presents a detailed description of the different strengthening measures required to allow a more flexible use of the existing floors with larger live and dead loads, and to fulfil the current provisions of the Swiss Standards (SIA). The main objective of the proposed restoration and strengthening measures is to minimize the interventions as much as possible and preserve the original structural system. Of particular interest is the innovative solution adopted for the existing ribbed slabs. The required increase of resistance is obtained through a thin 40 mm overlay of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) above the carefully prepared existing slab. Due to the significance of the building and the particular characteristics of the existing concrete, experimental tests were conducted. Four specimens of the ribbed slabs were extracted from the building, strengthened on site with UHPFRC and transported to the structural laboratory of the Swiss Federal Institute of Technology in Zürich (ETHZ), where the tests were conducted. The excellent results confirmed the suitability of the proposed strengthening solution through UHPFRC, setting a milestone for future restorations of these particular structures.</p>

Prediction of shear debonding strength of concrete structure with high-performance fiber reinforced concrete

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 4475-4480
Author(s):  
Milos Milovancevic ◽  
Nebojša Denić ◽  
Bogdan Ćirković ◽  
Zoran Nešić ◽  
Marija Paunović ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Performance Fiber
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