Behavior of high strength fly ash concrete columns under fire conditions

2012 ◽  
Vol 46 (5) ◽  
pp. 857-867 ◽  
Author(s):  
Wasim Khaliq ◽  
Venkatesh Kodur
Keyword(s):  
Fly Ash ◽  
High Strength ◽  
Concrete Columns ◽  
Fly Ash Concrete ◽  
Fire Conditions

Water Penetration Resistance of Fly Ash Concrete Incorporating with Quarry Wastes

2017 ◽  
Vol 886 ◽  
pp. 159-163 ◽  
Author(s):  
Suppachai Sinthaworn
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Strength ◽  
Cementitious Materials ◽  
Fine Aggregate ◽  
Water Penetration ◽  
Strength Concrete ◽  
Fly Ash Concrete ◽  
Suitable Amount ◽  
Normal Strength

Slump of fresh concrete, compressive strength and water penetration depth under pressure of fly ash concrete incorporate with quarry waste as fine aggregate were investigated. The cementitious materials of the concrete includes ordinary Portland cement 80% and fly ash 20% by weight of cementitious. The mix proportions of the concrete were set into two classes of compressive strength. The results show that fly ash enhances workability of both concretes (normal concrete and concrete incorporate with quarry waste). Increasing the percentage of quarry dusts as fine aggregate in concrete seem negligible effect on the compressive strength whereas adding fly ash shows a slightly improve the compressive strength in the case of cohesive concrete mixture. Besides, adding the suitable amount of fly ash could improve the permeability of concrete. Therefore, fly ash could be a good admixture to improve the water resistant of normal strength concrete and also could be a supplemental material to improve the compressive strength of normal high strength concrete.

scholarly journals RESEARCH ON PROPERTIES OF FLY ASH CONCRETE WITH RELATIVELY HIGH STRENGTH

2013 ◽  
Vol 67 (1) ◽  
pp. 325-332
Author(s):  
Hidetoshi OKADA ◽  
Takayoshi YAMADA ◽  
Yoshiaki SATO ◽  
Toshihiro OTANI
Keyword(s):  
Fly Ash ◽  
High Strength ◽  
Fly Ash Concrete

scholarly journals Optimization and Development of High-Strength High-Volume Fly Ash Concrete Mixes

2019 ◽  
Vol 8 (3) ◽  
pp. 5289-5293 ◽  
Keyword(s):  
Fly Ash ◽  
Activity Index ◽  
High Strength ◽  
High Volume ◽  
Past Research ◽  
Fly Ashes ◽  
Hydraulic Lime ◽  
Cement Replacement ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash

Cement is the most abundantly used ingredient in the production of concrete due to which its production and use has increased manifold. To reduce the carbon footprint left by the cement production, fly ash is used as cement replacement in concrete. Past research studies suggest that the fly ash replacement can be upto 40% beyond which there will be drastic reduction of strength. In the present study, high strength concrete mix of 70 grade is developed with high volume fly ash of 70% as cement replacement. Silica fume of 10% and hydraulic lime of 30% are used as additives in the development of M70 grade high-strength high-volume fly ash concrete. In the present paper, three types of fly ashes are considered for the study of which one which is ultrafine is chosen based on the pozzolanic index and strength activity index. Excess lime needed for various percentage of fly ashes is evaluated based on the empirical equationsgiven by the Dunstan Jr andZayed

Effect of Fly Ash on LifeCycle CO2 Assessment of Concrete Structure

2014 ◽  
Vol 692 ◽  
pp. 475-481
Author(s):  
Keun Hyeok Yang ◽  
Eun A Seo ◽  
Dong Uk Choi
Keyword(s):  
Performance Evaluation ◽  
Fly Ash ◽  
Concrete Structures ◽  
High Strength ◽  
Concrete Columns ◽  
Material System ◽  
Substitution Level ◽  
Concrete Production ◽  
Assessment Approach ◽  
S Model

The objective of the present study is to ascertain the effect of fly ash (FA) on the lifecycle CO2assessment of reinforced concrete structures. The reliable lifecycle CO2assessment approach of concrete structures were established and then specified using the developed CO2a performance evaluation table. The system boundary studied was from cradle to recycling of concrete, which includes material system, concrete production, transportation, construction, use and recycling activity phases. The assumed time and regional boundaries for concrete mixes were 2012 and Seoul, South Korea, respectively. The carbonation depth of concrete and CO2uptake during use of structure and recycling phases were calculated based on the Yang et al.’s model. Using the performance evaluation table, the effect of FA on the lifecycle CO2assessment of concrete columns and beams in an office building was examined under the different concrete strengths. The parametric study clearly showed that high-strength concrete is favorable to the reduction of lifecycle CO2amount of concrete columns, whereas the reduction is not expected for concrete beams. The lifecycle CO2amount of concrete structures decreases with the increase in the substitution level of FA up to 20%, beyond which the decreasing rate is insignificant.

scholarly journals The effects of steel fiber waste tyre on properties of high strength fly ash concrete

2019 ◽  
Vol 276 ◽  
pp. 01008
Author(s):  
Fauzan ◽  
Rudy Kurniawan ◽  
Claudia Lovina A. N ◽  
Oscar Fitrah N ◽  
Putri Basenda T
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Fly Ash Concrete ◽  
Waste Tyres ◽  
Waste Tyre

The utilization of steel fiber from waste tyres can be an alternative to reduce waste tyres due to the increase of tyre production in Indonesia annually. Steel fiber from waste tyre can be added to concrete mix to improve the concrete properties. In this study, the effects of steel fiber waste tyre (SFWT) on high strength concrete containing fly ash was investigated experimentally. The content of fly ash in the high strength concrete is 30% of being partially replaced the cement weight. Steel fiber waste tyres are obtained from extracting the steel wire of the waste tyres and then cut into 4 cm long. The addition of SFWT on the high strength fly ash concrete is 0.5%, 1.0%, 1.5%, and 2% by concrete volume. The mechanical properties of concrete such as compressive strength, tensile strength, and flexural strength are tested at day 28. The test results show that the addition of 2 % SFWT on high strength fly ash concrete increase the compressive strength, tensile strength, and flexural strength of the concrete by around 9.99 %, 63.75 %, 18.18 %, respectively.

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