Mechanical Properties of High-Volume Fly Ash Strain Hardening Cementitious Composite (HVFA-SHCC) for Structural Application

Strain-hardening cementitious composite (SHCC) is a kind of construction material that exhibits multiple cracking and strain-hardening behaviors. The partial replacement of cement with fly ash is beneficial to the formation of the tensile strain-hardening property of SHCC, the increase of environmental greenness, and the decrease of hydration heat, as well as the material cost. This study aimed to develop a sustainable construction material using a high dosage of fly ash (no less than 70% of the binder material by weight). Based on the micromechanics analysis and particle size distribution (PSD) optimization, six mixes with different fly ash to cement ratios (2.4–4.4) were designed. The mechanical properties of the developed high-volume fly ash SHCCs (HVFA-SHCCs) were investigated through tensile tests, compressive tests, and flexural tests. Test results showed that all specimens exhibited multiple cracking and strain-hardening behaviors under tension or bending, and the compressive strength of the designed mixes exceeded 30MPa at 28 days, which is suitable for structural applications. Fly ash proved to be beneficial in the improvement of tensile and flexural ductility, but an extremely high volume of fly ash can provide only limited improvement. The HVFA-SHCC mix FA3.2 (with fly ash to binder ratio of about 76% by weight) designed in this study is suggested for structural applications.

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Mechanical Properties and Shear Strengthening Capacity of High Volume Fly Ash-Cementitious Composite

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/310/1/012063 ◽

2018 ◽

Vol 310 ◽

pp. 012063 ◽

Cited By ~ 1

Author(s):

Aswin K Joseph ◽

K B Anand

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

High Volume ◽

Cementitious Composite ◽

Shear Strengthening ◽

High Volume Fly Ash

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Compression Behavior of Confined Columns with High-Volume Fly Ash Concrete

Advances in Materials Science and Engineering ◽

10.1155/2017/8208079 ◽

2017 ◽

Vol 2017 ◽

pp. 1-11

Author(s):

Sung-Won Yoo ◽

Young Cheol Choi ◽

Wonchang Choi

Keyword(s):

Reinforced Concrete ◽

Fly Ash ◽

Construction Material ◽

Concrete Columns ◽

High Volume ◽

Analysis Model ◽

Replacement Rate ◽

Reinforced Concrete Columns ◽

High Volume Fly Ash ◽

Structural Applications

The use of fly ash in ordinary concrete provides practical benefits to concrete structures, such as a gain in long-term strength, reduced hydration heat, improved resistance to chloride, and enhanced workability. However, few studies with high-volume fly ash (HVFA) concrete have been conducted that focus on the structural applications such as a column. Thus, there is a need to promote field applications of HVFA concrete as a sustainable construction material. To this end, this study investigated the compressive behavior of reinforced concrete columns that contain HVFA with a 50 percent replacement rate. Six columns were fabricated for this study. The study variables were the HVFA replacement rate, tied steel ratio, and tie steel spacing. The computed ultimate strength by the American Concrete Institute (ACI) code conservatively predicted the measured values, and, thus, the existing equation in the ACI code is feasible for confined RC columns that contain HVFA. In addition, an analysis model was calibrated based on the experimental results and is recommended for predicting the stress-strain relationship of confined reinforced concrete columns that contain HVFA.

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Mechanical Properties of a Green Hybrid Fibre-Reinforced Cementitious Composite

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.438-439.275 ◽

2013 ◽

Vol 438-439 ◽

pp. 275-279 ◽

Cited By ~ 3

Author(s):

He Tian ◽

Yi Xia Zhang

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

High Volume ◽

Ash Content ◽

Cementitious Composite ◽

Green Composite ◽

Cement Ratio ◽

High Volume Fly Ash ◽

Hybrid Fibre

In this paper, a new green hybrid fibre-reinforced cementitious composite with high volume fly ash and steel and bagasse fibres is developed. High volume fly ash is used to partly replace cement and make the composite greener. Eco-friendly bagasse fibres from industrial waste and steel fibres are utilized to improve the mechanical behavior. In particularly, the influence of the parameters such as the sand/cement ratio and fly ash/cement ratio on the mechanical properties of the composite is investidated by evaluating the essential mechanical properties such as compressive strength and modulus of elasticity. The new green composite is found to be sustainable with high compressive. It is found that compressive strength of the composite decreases while the Young's modulus increases with the increase of the sand content, and that compressive strength and Youngs modulus of the composite decreases with the increase of the fly ash content.

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EFFECT OF HIGH VOLUME FLY ASH CONCRETE IN SELF-CURING ENGINEERED CEMENTITIOUS COMPOSITE (ECC)

10.31224/osf.io/b53wx ◽

2020 ◽

Author(s):

Yoganantham C ◽

Joanna P.S

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

High Performance ◽

High Volume ◽

Strength Development ◽

Curing Agent ◽

Cementitious Composite ◽

River Sand ◽

Manufactured Sand ◽

High Volume Fly Ash

Engineered Cementitious Composites (ECC) is a special type of high performance fibre reinforced cementitious composite having uniquely high ductile and tensile properties. Reducing the usage of cement in ECC by using less energy intensive binders is a step in the attainment of sustainable development to reduce greenhouse gases. River sand is also becoming a scarce commodity and hence exploring alternatives to it has become important. This paper focuses on characterizing the mechanical properties of an Eco – friendly ECC with High Volume Fly Ash (HVFA) content, manufactured sand and Polyvinyl Alcohol (PVA) Fibre. Experiments were conducted for finding the mechanical properties of ECC by the influence of HVFA (60%, 70% & 80%) content, Self-curing Agent (Polyethylene Glycol 600) and Calcium Carbonate. The results show that the mechanical properties of HVFA-ECC having fly ash up to 70% are comparable with those of ECC without fly ash. Addition of CaCO3 and self-curing agent contributed for the early strength development and an alternative for water curing in HVFA-ECC

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