scholarly journals Early strength of various fly ash based concrete in peat environment

2019 ◽  
Vol 276 ◽  
pp. 01022 ◽  
Author(s):  
Monita Olivia ◽  
Gunawan Wibisono ◽  
Edy Saputra
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
High Volume ◽  
Organic Content ◽  
Target Strength ◽  
Acid Attack ◽  
Cement Replacement ◽  
Concrete Mixtures ◽  
High Volume Fly Ash ◽  
Early Strength

Fly ash is a by-product of coal combustion in a power station and usually used as additive or cement replacement material to improve properties of concrete in aggressive environments such as acid, chloride, and sulphate. Peatland is one of acidic environment that is common in Riau province with high organic content and low pH that is damaging for concrete, especially when exposed to concrete at an early age. This paper aims to study the early compressive and tensile strength of the various type of fly ash based concrete subjected to peat water. Seven fly ash-based concrete mixtures investigate were, i.e., geopolymer hybrid using 15% of Ordinary Portland Cement (OPC) as an additive, high volume fly ash using 25%, 50% and 75% of fly ash as cement replacement material, and blended OPC with fly ash with different grade of 15, 21 and 29 MPa. The OPC concrete with a target strength of 20 MPa was a control mix. The OPC based-specimens were cast and cured in water for 28 days before placed in peat water for another 28 days before the testing date. Compressive strength and tensile strength values of the concrete at 7 and 28 days were taken. Results show the type of concrete, fly ash content, and concrete grade significantly influence the early strength properties and resistance of the concrete to the acid attack. Four concrete mixtures with decreasing vulnerability to the attack were distinguished: OPC, high volume fly ash, geopolymer hybrid and blended cement 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

scholarly journals Performance of Additive Blended High Volume Fly Ash Concrete - A Systematic Literature Study

2021 ◽  
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Elasticity Modulus ◽  
Flexural Rigidity ◽  
Concrete Specimen ◽  
High Volume ◽  
Literature Study ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Strength Tests

Abstract. Replacing cement with fly ash has recently created huge popularity among the construction field because of its huge production, efficient resources and sustainability aspect. This study is made to determine the High-Volume fly-ash concrete (HVFC) performance by adding additives. The general used concrete mixture is prepared by proportioning fly ash (40-50%) as a replacement. The concrete specimen was found to have better compressive strengths and hence, passed the strength tests. By incorporating additive Nano-SiO2 and superplasticizer the following compression, flexural rigidity, splitting tensile strength and elasticity modulus were observed in the specimen to establish the cement and fly ash bond. The concrete performance mix with replacement fly ash at different percent was found to have good compressive strength during test and stayed undamaged during the entire period of exposure.

scholarly journals Comprehensive Investigation on the Potential of Fly Ash from New Source as Construction Material

2021 ◽  
Vol 23 (2) ◽  
pp. 78-90
Author(s):  
Antoni Antoni ◽  
Florentcia Hartono ◽  
Steven Tanuwijaya ◽  
Kevin Wijaya ◽  
Agie Vianthi ◽  
...  
Keyword(s):  
Fly Ash ◽  
Calcium Hydroxide ◽  
Alkaline Solution ◽  
Construction Material ◽  
High Volume ◽  
Comprehensive Investigation ◽  
Good Source ◽  
Cement Replacement ◽  
High Volume Fly Ash ◽  
Very High

Fly ash has been highly advocated to be re-utilized as a construction material. The most common utilization is to partially replace cement in a low-percentage scheme. However, there are several other schemes available to potentially use fly ash as binder in concrete that have not been widely exercised, especially those utilizing it in high to very high volume. In those schemes, high-volume fly ash (HVFA) concrete might use more than 50% fly ash to replace cement. To exploit its self-cementing properties, with or without the addition of other compounds, such as calcium hydroxide, fly ash might be used in very high percentage of cement replacement. In geopolymeric system, fly ash acts as the precursor of a stable binder, with the presence of highly alkaline solution. This paper demonstrates a model to investigate the potential of fly ash in several binder systems. The results show that fly ash from a good source can be utilized as an alternative binder in several different schemes.

Effect of steam curing on class C high-volume fly ash concrete mixtures

2005 ◽  
Vol 35 (6) ◽  
pp. 1122-1127 ◽  
Author(s):  
Halit Yazıcı ◽  
Serdar Aydın ◽  
Hüseyin Yiğiter ◽  
Bülent Baradan
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Steam Curing ◽  
Fly Ash Concrete ◽  
Concrete Mixtures ◽  
High Volume Fly Ash ◽  
Class C

Effects of different size of fly ash as cement replacement on self-compacting concrete properties

2019 ◽  
Vol 1 (2) ◽  
pp. 180-186
Author(s):  
Dilan Rantung ◽  
Steve W.M. Supit ◽  
Seska Nicolaas
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Building Construction ◽  
Particle Sizes ◽  
Self Compacting Concrete ◽  
Cement Replacement ◽  
Concrete Mixtures ◽  
Water Curing ◽  
Passing Ability

This paper aims to investigate experimentally the influence of replacing cement with different fineness of fly ash based on flowability, passing ability, compressive strength, tensile strength (splitting). Concretes with 15% fly ash (passed a number 100 sieve) and fine fly ash (passed a number 200 sieve) as cement replacement were cast and tested at 7, 14, 28 days after water curing. A superplasticizer in the form of viscocrete 3115 N was constantly used for each concrete mixtures as much as 1% by weight of cement. The results show that the use of fly ash does not significantly increased the compressive strength and tensile strength of SCC mixtures. However, concrete with 15% fine fly ash its self and combined 7.5% fly ash with 7.5% fine fly ash show better flowability and passing ability when compared to concrete with cement only indicating the performance of using smaller particle sizes of fly ash could lead better properties of SCC that can be potentially used for building construction application.

scholarly journals Effect of Biomass Fly Ash on Fresh and Hardened Properties of High Volume Fly Ash Mortars

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 233
Author(s):  
Elisabete R. Teixeira ◽  
Aires Camões ◽  
Fernando G. Branco ◽  
José Campos Matos
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
High Volume ◽  
Hydrated Lime ◽  
Cement Replacement ◽  
High Volume Fly Ash ◽  
Hardened State ◽  
Biomass Fly Ash

The objective of this work was to assess the use of biomass fly ash (BFA) as cement replacement material or as an alkalinity source in high volume fly ash mortar and concrete. Mortar formulations were prepared with different types of cement replacement: fly ash from thermal power plants, BFA, a blend of two pozzolans, and small amounts of BFA or/and hydrated lime (HL). Mortar formulations were tested both in the fresh and hardened state. The replacement of cement by the two fly ashes led to a decrease in the mechanical strength. The best strength values were obtained when higher HL content was introduced in mortars, however, mortars with the lower BFA content presented the best results for the majority of the tests. In general, BFA has a similar effect on cementitious mortars to coal fly ash, having good performance as cement replacement.

scholarly journals STATISTICAL ANALYSIS OF PROPERTIES OF HIGH-VOLUME FLY ASH CONCRETES AS CEMENT REPLACEMENT

2020 ◽  
Vol 8 ◽  
pp. 1-20
Author(s):  
Adilson Schackow ◽  
Débora Ganasini ◽  
Décio Marcon Neto ◽  
Carmeane Effting ◽  
Gustavo Aurélio Cifuentes
Keyword(s):  
Statistical Analysis ◽  
Fly Ash ◽  
High Volume ◽  
Cement Replacement ◽  
High Volume Fly Ash

scholarly journals Improving Surface Durability of High Volume Fly Ash Concrete with Application of Alkali Solution

2012 ◽  
Vol 626 ◽  
pp. 636-640 ◽  
Author(s):  
Antoni ◽  
Oswyn K. Wattimena ◽  
Djwantoro Hardjito
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Solution Concentration ◽  
Alkali Solution ◽  
Acid Attack ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Surface Durability ◽  
Durability Performance ◽  
Hardened Surface

This study aims to determine whether the surface durability of high volume fly ash (HVFA) concrete can be improved by applying alkali solution on its hardened surface. Concentrations of alkali solution and methods of application were studied on several w/cm ratios and replacement percentage of fly ash in concrete mixture proportion to investigate the durability performance. Durability tests conducted were accelerated sulfuric acid attack and ion chloride penetration to investigate the improved durability of HVFA concrete. From the results, it was shown that applying alkali solution on the surface of HVFA concrete can increase its durability performance. The different w/cm ratio and the percentage of fly ash used affect the increase in durability performance. The optimum alkali solution concentration and method of application need further research to determine their effectivity.

Study on Mechanical Properties of High Volume Fly Ash Concrete

2013 ◽  
Vol 339 ◽  
pp. 638-641 ◽  
Author(s):  
Ling Mei Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Mineral Admixture ◽  
Concrete Compressive Strength ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash

With the acceleration of economic development, high-performance concrete applied more widespread due to its own merit. A certain amount of mineral admixture important role in the performance of high-performance concrete. This paper studies the high ash (30% -50%) of fly ash concrete compressive strength, splitting tensile strength, static elastic modulus and other mechanical properties.

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