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.

Performance of Low Modulus Fibers in Engineered Cementitious Composites (ECCs): Flexural Strength and Pull out Resistance

2013 ◽  
Vol 687 ◽  
pp. 495-501 ◽  
Author(s):  
Mana Halvaei ◽  
Masoud Jamshidi ◽  
Masoud Latifi ◽  
Zahra Behdouj
Keyword(s):  
Flexural Strength ◽  
High Performance ◽  
Cementitious Materials ◽  
Cementitious Composites ◽  
Pull Out ◽  
The Matrix ◽  
High Performance Fiber ◽  
Low Modulus ◽  
New Generation ◽  
Fiber Reinforced Cementitious Composites

Cement based materials are brittle in nature. Fibers have been used to improve flexural/tensile behaviors of the cementitious materials from one hundred years ago. Recently, a new generation of high performance fiber reinforced cementitious composites (HPFRCCs) has been introduced by Professor V.C. Li which was called Engineered Cementitious Composite (ECC). ECC showed incredible flexural and tensile strengths as it was called as flexible concrete by some researchers. Usually, high modulus fibers have been used in ECCs as reinforcement. In this research, homemade low modulus fibers (acrylic, nylon 66 and polypropylene) were used as reinforcement in ECC. Flexural strength test were performed on the ECC sheets. Also, Pull out test was performed to determine adhesion energy and toughness between the fibers and the matrix. It was found that low modulus fibers caused lower flexural strength and bonding to matrix than PVA fibers. However, they were found as suitable fibers for products with good cost-quality balance especially for construction purposes.

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.

Experimental Research on the Flexural Failure Properties of Green High Performance Fiber Reinforced Cementitious Composites (GHPFRCC)

2013 ◽  
Vol 423-426 ◽  
pp. 1114-1117
Author(s):  
Xiu Ling Li ◽  
Min Luo ◽  
Juan Wang
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Failure Process ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Flexural Failure ◽  
Binder Ratio ◽  
High Performance Fiber ◽  
Failure Properties ◽  
Fiber Reinforced Cementitious Composites

Green high performance fiber reinforced cementitious composites (GHPFRCC) is a new class of Engineered Cementitious Composites (ECC) with high volume fly ash based on the orthogonal experimental method. Focus is placed on the flexural failure properties of GHPFRCC, considering the influences factors like fly ash content, water-binder ratio, sand-binder ratio, PVA (Polyvinyl Alcohol) fiber and water reducing agent, et al. The experimental results indicate that the failure process of GHPFRCC beam can be divided into three stages including elastic stage, yield stage and failure stage. The multiple fine cracks appeared in the specimen can effectively dissipate energy.

scholarly journals Study on using maximum amount of fly ash in producing ultra-high performance concrete

2018 ◽  
Vol 12 (3) ◽  
pp. 51-61
Author(s):  
Van Viet Thien An
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Cementitious Materials ◽  
Maximum Amount ◽  
Ultra High Performance Concrete ◽  
Design Expert ◽  
High Volume Fly Ash

In the present study, the synergic effects of cementitious materials in the ternary binder containing cement, silica fume, fly ash on the workability and compressive strength were evaluated by using the D-optimal design of Design-Expert 7. The ternary binder composed of 65 vol.-% cement, 15 vol.-% SF and 20 vol.-% FA at the W/Fv ratio of 0.50 is the optimum mixture proportions for the highest compressive strength of the UHPC. To produce the sustainable UHPC, high-volume fly ash ultra high performance concrete with a good flowability and 28-d compressive strength over 130 MPa can be produced with fly ash content up to 30 vol.-% in the binder. Article history: Received 21 March 2018, Revised 06 April 2018, Accepted 27 April 2018

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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