Project Application of High Volume Fly Ash Concrete

C40R60 High volume fly ash (HVFA) concrete were adopted for the continuously casting massive foundation slab of Tianjin Tower, which has a volume of about 20 000 m3, to decrease the risk of cracking during the construction process. Suitable raw materials and mix proportion were chosen. The properties of hardened concrete cured under different conditions were investigated. A mock-up of massive structure with the dimension of 4.5×4.5×4m was cast using determined concrete. The temperature development in the core of structure was measured. The results show that the temperature rise in the core is relatively low and the compressive strength curing under the standard condition for 60 days is 54.3MPa. HVFA concrete is much suitable to the massive concrete structure in which elevated temperature would be kept for a long time.

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Application of HVFA Concrete in Massive Structure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.683.195 ◽

2013 ◽

Vol 683 ◽

pp. 195-198

Author(s):

Xiang Li ◽

Jian Jun Yan ◽

Shang Shi Peng

Keyword(s):

Raw Materials ◽

Standard Condition ◽

High Volume ◽

Hardened Concrete ◽

Foundation Slab ◽

The Core ◽

Massive Structure ◽

Mix Proportion ◽

High Volume Fly Ash ◽

Long Time

C40R60 High volume fly ash (HVFA) concrete were adopted for the continuously casting massive foundation slab of Tianjin Tower, which has a volume of about 20 000 m3, to decrease the risk of cracking during the construction process. Suitable raw materials and mix proportion were chosen. The properties of hardened concrete cured under different conditions were investigated. The temperature development in the core of structure was measured. The results show that the temperature rise in the core is relatively low and the compressive strength curing under the standard condition for 60 days is 54.3MPa. HVFA concrete is much suitable to the massive concrete structure in which elevated temperature would be kept for a long time.

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Testing Study of FA-ASP Binder Mortar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.438-439.72 ◽

2013 ◽

Vol 438-439 ◽

pp. 72-74

Author(s):

Huan Qiang Liu ◽

Yu Ping Tong ◽

Jin Liang Jin ◽

Zhen Wang ◽

Kai Qin ◽

...

Keyword(s):

Fly Ash ◽

Production Cost ◽

Mechanical Performance ◽

Cement Mortar ◽

Raw Materials ◽

High Volume ◽

Development Prospect ◽

High Volume Fly Ash ◽

Masonry Mortar

By using high-volume fly ash (FA), aluminum slag superfine powder (ASP) as raw materials to synthesize FA-ASP binder, this paper developed M10 masonry mortar. Comparing with the cement mortar and FA mortar, the FA-ASP mortar has not only good construction performance and mechanical performance, but also reduces the production cost obviously, which is a broad development prospect of green new building mortar.

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Nanosilica Activated High Volume Fly Ash Concrete: Effects on Selected Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.722.157 ◽

2016 ◽

Vol 722 ◽

pp. 157-162 ◽

Cited By ~ 1

Author(s):

Martin Labaj ◽

Rudolf Hela ◽

Iveta Hájková

Keyword(s):

Fly Ash ◽

Raw Materials ◽

Water Pressure ◽

Construction Material ◽

High Volume ◽

Strength Development ◽

Early Age ◽

Fly Ash Concrete ◽

High Volume Fly Ash ◽

Static And Dynamic Moduli

By volume, there is no other material used as much as concrete. Its mechanical properties, durability and favorable price makes concrete the perfect construction material. In last few decades, we are seeing a growing trend of partial Portland cement’s replacement with secondary raw materials, most commonly with fly ash. So-called high volume fly ash (HVFA) concretes usually contains over 50% of it. While HVFA concrete’s long-term properties and price are improved over the classical one, its early age properties are often affected negatively. Here, a highly reactive pozzolans enters the scene. Materials like microsilica and metakaolin are known to accelerate concrete’s strength development and improve early age characteristics. In this paper, nanosilica is used for this purpose. These SiO2 nanoparticles possesses a much higher surface area and thus reactivity. Three mixtures with 0, 40 a 60% portland cement’s replacement with fly ash were prepared and tested with and without addition of small amount of nanosilica. Effects on compressive strength, static and dynamic moduli of elasticity and resistivity against water pressure were observed. Results clearly demonstrates that even with dosage in the range of tenths of percent, nanosilica can significantly improve concrete’s properties.

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A Development of the Research on High Performance Concrete Incorporated with High Volume Fly Ash

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.302-303.26 ◽

2006 ◽

Vol 302-303 ◽

pp. 26-34

Author(s):

Feng Xing ◽

Xiang Yong Guo ◽

Fa Guang Leng ◽

Ren Yu Zhang

Keyword(s):

Fly Ash ◽

High Performance ◽

High Performance Concrete ◽

High Volume ◽

Raw Material ◽

Engineering Practice ◽

Fly Ash Concrete ◽

Mix Proportion ◽

High Volume Fly Ash ◽

And Performance

In this paper, the main characteristic of definition, property, requirement of raw material, mix proportion design and performance improvement of high volume fly ash concrete (for short HVFAC) are summarized. The applications of HVFAC in dam, highway, building and port are introduced. The research results have shown that HVFAC have outstanding properties of physical mechanics, but some problems need to be further studied. It is believed that an operable strict corresponding technical criterion would be set down as soon as possible for engineering practice.

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An Assessment of Characteristics of Densified High-Performance Concrete Incorporating High Volume Fly Ash

Materials Science Forum ◽

10.4028/www.scientific.net/msf.923.105 ◽

2018 ◽

Vol 923 ◽

pp. 105-109

Author(s):

Trong Phuoc Huynh ◽

Chao Lung Hwang

Keyword(s):

Fly Ash ◽

High Performance ◽

High Performance Concrete ◽

High Volume ◽

Strength Development ◽

Hardened Concrete ◽

Microstructural Characteristics ◽

Design Algorithm ◽

High Volume Fly Ash ◽

Maximum Compressive Strength

The present study evaluates the mechanical-microstructural characteristics of the densified high-performance concrete (HPC) incorporating high volume fly ash (FA). The densified mixture design algorithm (DMDA) technology was applied to design the concrete proportions. The effects of various FA contents on both fresh and hardened concrete were investigated. A scanning electron microscope (SEM) was used to observe the microstructure of the concrete samples. The effectiveness of using DMDA in mix deign was also discussed in this study. As the experimental results, the FA content was found to affect the concrete properties significantly. The maximum compressive strength value of 65.1 MPa was obtained at the concrete samples containing 40% FA. Additionally, the 40% FA samples exhibited a denser microstructure as compared to the others. Generally, all of the tested concrete samples exhibited good performance in terms of workability, strength development, water absorption, and porosity. The results of this study further show the effectiveness of using DMDA technology in proportioning of the concrete mixture.

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PENGARUH PERSENTASE FLY ASH TERHADAP KUAT TEKAN HIGH VOLUME FLY ASH SELF COMPACTING CONCRETE SPESIMEN SILINDER 150 MM X 300 MM USIA 90 HARI

Matriks Teknik Sipil ◽

10.20961/mateksi.v6i3.36556 ◽

2018 ◽

Vol 6 (3) ◽

Author(s):

Sonny Bhaksono Aji ◽

Agus Setiya Budi ◽

Senot Sangadji

Keyword(s):

Fly Ash ◽

Testing Machine ◽

High Volume ◽

Mix Design ◽

Hardened Concrete ◽

Self Compacting Concrete ◽

Replacement Ratio ◽

Degree Of Hydration ◽

High Volume Fly Ash ◽

Cementing Material

Penggunaan supplementary cementing material yang bersifat pozzolan seperti fly ash banyak dipertimbangkan karena selain efektif me-reduce penggunaan portland cement, fly ash juga merupakan limbah pembakaran batu bara yang kurang termanfaatkan. High volume fly ash self compacting concrete dapat menghasilkan sustainable concrete dengan mechanical strength yang tinggi dan workability yang baik. Penelitian ini bertujuan untuk menganalisis pengaruh persentase fly ash terhadap kuat tekan HVFASCC. Penelitian menggunakan 1 mix design beton normal usia 28 hari dan 3 variasi mix design HVFASCC usia 90 hari dengan fly ash replacement ratio 50%, 60% dan 70% dengan total cementitious 500 kg/m3. Spesimen yang digunakan adalah silinder 150 x 300 mm sejumlah 3 buah untuk tiap mix design. Pengujian yang dilakukan meliputi pengujian beton segar dan hardened concrete. Untuk destructive test dilakukan sesuai standar ASTM C469 dengan compressive testing machine. Hasil pengujian beton segar menunjukkan workability semakin baik seiring peningkatan fly ash replacement ratio. Pengujian hardened concrete untuk NC.90, HVFA.90.50, HVFA.90.60, HVFA.90.70 menghasilkan kuat tekan 74,98 MPa, 74,60 MPa, 58,95 MPa, 46,50 MPa. Adanya perbedaan kuat tekan terjadi karena adanya evolusi dari reaksi yang terjadi pada fly ash-cement blends yang melibatkan degree of hydration dan degree of reaction.

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Effects of the Loss on Ignition of Fly Ash on the Properties of High-Volume Fly Ash Concrete

Sustainability ◽

10.3390/su11092704 ◽

2019 ◽

Vol 11 (9) ◽

pp. 2704 ◽

Cited By ~ 5

Author(s):

How-Ji Chen ◽

Neng-Hao Shih ◽

Chung-Hao Wu ◽

Shu-Ken Lin

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Modulus Of Elasticity ◽

High Volume ◽

Cementitious Materials ◽

Hardened Concrete ◽

Fine Aggregate ◽

Loss On Ignition ◽

High Volume Fly Ash ◽

Hardened Properties

This study presents the experimental results of fresh and hardened properties of concrete incorporating high-volume fly ash (HVFA). Two kinds of low-calcium fly ash with loss on ignition (LOI) of 5% and 8% were used as replacement for cement and/or fine aggregate of 0% (control), 20%, 40%, 50%, 60% and 80% by weight of the total cementitious materials. The properties of fresh concrete tested included the slump, air content, unit weight and setting time; those of hardened concrete determined included compressive strength, modulus of elasticity, flexural strength and drying shrinkage. Test results indicate that the concretes made with high-LOI (8%) fly ash can be successfully produced for structural concrete, which contains fly ash of up to 60% of the total cementitious materials. The high-LOI fly ash-concretes with higher replacement levels presented longer setting times. However, although both the fresh and hardened properties of high LOI fly ash concretes were inferior to those of the low-LOI (5%) fly ash concretes, the high modulus of elasticity, the adequate strength development characteristics both at early and later ages (up to 365 days) and the low dry shrinkage were observed when compared to those of the control concrete with a comparable 28-day compressive strength of 30 MPa.

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Reducing Greenhouse Gas Emissions in Texas with High-Volume Fly Ash Concrete

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198105194100122 ◽

2005 ◽

Vol 1941 (1) ◽

pp. 167-174 ◽

Cited By ~ 2

Author(s):

Cindy K. Estakhri ◽

Donald Saylak

Keyword(s):

Carbon Dioxide ◽

Fly Ash ◽

Carbon Dioxide Emissions ◽

Power Plants ◽

High Volume ◽

Heat Of Hydration ◽

Environmental Benefits ◽

Hardened Concrete ◽

High Volume Fly Ash ◽

Concrete Production

The objective of this study was to determine the potential for reductions in carbon dioxide emissions in Texas by substituting high volumes of fly ash in concrete production and to identify the resulting benefits and challenges. Researchers reviewed the literature and determined that high-volume fly ash can improve the properties of both fresh and hardened concrete. It can improve workability, heat of hydration, strength, permeability, and resistance to chemical attack. Researchers compiled data from 18 power plants located throughout Texas and determined that 6.6 million tons of fly ash are produced annually in Texas and about 2.7 million tons (or 40%) are generally sold for use in concrete or other end products. Researchers estimated the production of concrete in Texas and determined that if 60% of the portland cement used in Texas concrete production were replaced with fly ash, carbon dioxide emissions could be reduced by 6.6 million tons annually by the year 2015. More education is needed for design engineers and for the concrete industry regarding the performance and environmental benefits that can be realized through increased use of fly ash in concrete.

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