Study on the Reinforced Concrete Column Strengthened by GHPFRCC with High Volume of Fly Ash

2011 ◽  
Vol 99-100 ◽  
pp. 213-219 ◽  
Author(s):  
Xiu Ling Li ◽  
Min Luo
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
High Performance ◽  
High Volume ◽  
Concrete Column ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Column ◽  
High Performance Fiber ◽  
Unique Green ◽  
Pva Fiber

The tensile strength and ductility of normal concrete are dissatisfactory and these lead to some durability problems for reinforced concrete structure. On the other hand, China’s production and consumption of concrete is the largest in the world, and with the rapid economic development the number also continue to increase. A new class of more sustainable cement-based materials is urgently needed in China. This paper reports on the development of engineering cementitious composites (ECC), and a unique green high-performance fiber-reinforced cementitious composite (GHPFRCC) with high volumes of fly ash and PVA fiber is proposed. The detailed procedure of GHPFRCC is presented. The calculated equations of the load-bearing capacity of the reinforced concrete column retrofitted by GHPFRCC are proposed.

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>

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 Tailoring Confining Jacket for Concrete Column Using Ultra High Performance-Fiber Reinforced Cementitious Composites (UHP-FRCC) with High Volume Fly Ash (HVFA)

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4010 ◽  
Author(s):  
Alessandro P. Fantilli ◽  
Lucia Paternesi Meloni ◽  
Tomoya Nishiwaki ◽  
Go Igarashi
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Mechanical Response ◽  
High Volume ◽  
Cementitious Materials ◽  
Seismic Retrofitting ◽  
Cementitious Composites ◽  
High Performance Fiber ◽  
Mechanical Approach ◽  
Mechanical Performances

Ultra-High Performance Fibre-Reinforced Cementitious Composites (UHP-FRCC) show excellent mechanical performances in terms of strength, ductility, and durability. Therefore, these cementitious materials have been successfully used for repairing, strengthening, and seismic retrofitting of old structures. However, UHP-FRCCs are not always environmental friendly products, especially in terms of the initial cost, due to the large quantity of cement that is contained in the mixture. Different rates of fly ash substitute herein part of the cement, and the new UHP-FRCCs are used to retrofit concrete columns to overcome this problem. To simulate the mechanical response of these columns, cylindrical specimens, which are made of normal concrete and reinforced with different UHP-FRCC jackets, are tested in uniaxial compression. Relationships between the size of the jacket, the percentage of cement replaced by fly ash, and the strength of the columns are measured and analyzed by means of the eco-mechanical approach. As a result, a replacement of approximately 50% of cement with fly ash, and a suitable thickness of the UHP-FRCC jacket, might ensure the lowest environmental impact without compromising the mechanical performances.

Analytical Prediction of the Mechanical Properties of High Performance PVA Fiber Reinforced Concrete

2014 ◽  
Vol 567 ◽  
pp. 345-350 ◽  
Author(s):  
Tehmina Ayub ◽  
Nasir Shafiq ◽  
Muhd Fadhil Nuruddin
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Analytical Prediction ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Binder Ratio ◽  
High Performance Fiber ◽  
Pva Fiber

In this paper, mechanical properties of three series of high performance fiber reinforced concrete (HPFRC) containing 1, 2 and 3% of Polyvinyl Alcohol (PVA) fiber volume are presented. The first series of HPFRC was prepared by using 100% cement, whereas remaining two series were prepared by replacing 10% cement content with silica fume and locally produced metakaolin. All series were designed with water to binder ratio (w/b) of 0.4. The mechanical properties determined in this study include compressive strength, splitting tensile strength and flexural strength. Testing of the specimens was conducted at the 28 days of curing. Experimental results showed that the 3% PVA fiber is the optimum fiber volume to improve the mechanical properties of HPFRC. The variation in the mechanical properties due to the addition of PVA fibers was investigated and presented in the form of mathematical relationship. Further, interrelationship among the mechanical properties was also determined.

scholarly journals Fundamental Study on the Development of Sprayed High Performance Fiber Reinforced Cementitious Composites for Impact-Blast Resistant

2017 ◽  
Author(s):  
Yun-Wang Choi ◽  
Byung-Keol Choi ◽  
Sung-Rok Oh ◽  
Man-Seok Park
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
Drying Shrinkage ◽  
High Volume ◽  
Heat Of Hydration ◽  
Economic Feasibility ◽  
Fundamental Study ◽  
Binder Ratio ◽  
High Performance Fiber

In the recent concrete industry, high fluidity concrete is being widely used for the pouring of dense reinforced concrete. Normally, in the case of high fluidity concrete, it includes high binder contents, so it is necessary to replace part of the cement through admixtures such as fly ash to procure economic feasibility and durability. This study shows the mechanical properties and field applicability of high fluidity concrete that using mass of fly ash as alternative materials of cement. The high fluidity concrete mixed with 50% fly ash was measured to manufacture concrete that applies low water/binder ratio to measure the mechanical characteristics as compressive strength and elastic modulus. Also, in order to evaluate the field applicability, high fluidity concrete containing high volume fly ash was evaluated that fluidity, compressive strength, heat of hydration and drying shrinkage of concrete.

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