Experimental Study on Various Mineral Admixtures in Fibre Reinforced Concrete

2019 ◽  
pp. 309-317
Author(s):  
Kavitha E ◽  
Karthik S ◽  
Eithya B ◽  
Seenirajan M
Keyword(s):  
Fly Ash ◽  
Rice Husk ◽  
Power Plants ◽  
Rice Husk Ash ◽  
Thermal Power ◽  
Experimental Studies ◽  
Mineral Admixtures ◽  
Hardened Concrete ◽  
Polypropylene Fibres ◽  
Concrete Production

The quantity of fly ash produced from thermal power plants in India is approximately 80 million tons each year, and its percentage utilization is less than 10%. An attempt has been made to utilize these cheaper materials in concrete production. This thesis aims at investigating the characteristics of fresh concrete and various strengths of hardened concrete made with various mineral admixtures such as fly ash. GGBFS, silica fume. Rice husk ash along with polypropylene fibres in various proportions.  M20 grade concrete is considered for experimental studies with 53grade Ordinary Portland Cement blended with varying percentages of mineral admixtures. The maximum size of coarse aggregate used is 20mm.  Various mineral admixtures such as fly ash. GGBFS.Silica fume. Rice Husk Ash were added concrete in various percentages by partially replacing cement and the optimum percentage of the mineral admixtures will be found.  Based on the obtained values, the admixture with maximum mechanical strength is determined and to this polypropylene fibre is added by varying 0 to 0.5 % by weight of cement to the mix.  The test results obtained were compared and discussed with conventional concrete.

scholarly journals Stabilization of Indian Fly Ashes with Soils, Cement, and Randomly Oriented Fibers

2012 ◽  
Vol 3 ◽  
pp. 1-8
Author(s):  
Shenbaga R. Kaniraj ◽  
V. Gayathri ◽  
V.G. Havanagi
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Thermal Power ◽  
Experimental Studies ◽  
Fly Ashes ◽  
Strength Criteria ◽  
Permeability Characteristics ◽  
Polyester Fibers ◽  
Soil Mixtures ◽  
Pavement Base

 Experimental studies were carried out on fly ashes from two Indian thermal power plants, namely Rajghat and Dadri, with the aim of improving the utilization of fly ash in geotechnical engineering applications. It was attempted to improve the engineering performance of fly ash by several means such as by mixing fly ash with soils, cement, and polyester fibers. The research program included the study of: a) physical properties, chemical composition and morphology of the fly ashes; b) compaction, strength, and permeability characteristics of the fly ashes and fly ash-soil mixtures; c) compaction and strength characteristics of fly ash-soil mixtures stabilized with fibers alone, with cement alone, and with both cement and fibers. Results showed that addition of fly ash to soils would result in lighter and stronger fills. Fiber inclusions increased the strength of fly ash-soil specimens significantly and altered their behaviour from brittle to ductile. Even small cement contents increased the strength of the fly ash-soil mixtures significantly. With higher cement contents of up to 18% it was possible to prepare fly ash-cement design mixes that satisfied the strength criteria for pavement base courses.

scholarly journals Effect of Rice Husk Ash and Fly Ash on the workability of concrete mixture in the High-Rise Construction

2018 ◽  
Vol 33 ◽  
pp. 02029 ◽  
Author(s):  
Lam Van Tang ◽  
Boris Bulgakov ◽  
Sofia Bazhenova ◽  
Olga Aleksandrova ◽  
Anh Ngoc Pham ◽  
...  
Keyword(s):  
Fly Ash ◽  
Rice Husk ◽  
Urban Areas ◽  
Power Plants ◽  
Thermal Power ◽  
Concrete Mixture ◽  
Regression Equations ◽  
Humid Climate ◽  
High Rise ◽  
Concrete Mixtures

The dense development of high-rise construction in urban areas requires a creation of new concretes with essential properties and innovative technologies for preparing concrete mixtures. Besides, it is necessary to develop new ways of presenting concrete mixture and keeping their mobility. This research uses the mathematical method of two-factors rotatable central compositional planning to imitate the effect of amount of rice husk (RHA) and fly ash of thermal power plants (FA) on the workability of high-mobility concrete mixtures. The results of this study displays regression equation of the second order dependence of the objective functions - slump cone and loss of concrete mixture mobility due to the input factors - the amounts RHA (x1) and FA (x2), as well as the surface expression image of these regression equations. An analysis of the regression equations also shows that the amount of RHA and FA had a significant influence on the concrete mixtures mobility. In fact, the particles of RHA and FA will play the role as peculiar "sliding bearings" between the grains of cement leading to the dispersion of cement in the concrete mixture. Therefore, it is possible to regulate the concrete mixture mobility when transporting fresh concrete to the formwork during the high-rise buildings construction in the hot and humid climate of Vietnam. Although the average value of slump test of freshly mixed concrete, measured 60 minutes later after the mixing completion, decreased from 18.2 to 10.52 cm, this value still remained within the allowable range to maintain the mixing and and the delivery of concrete mixture by pumping.

scholarly journals Efficiency of rice husk ash and fly ash as reactivity materials in sustainable concrete

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Mohamed Amin ◽  
Bassam Abdelsalam Abdelsalam
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Rice Husk ◽  
Water Permeability ◽  
Rice Husk Ash ◽  
Experimental Program ◽  
Hardened Concrete ◽  
Concrete Mixtures

AbstractMany environmental problems occur due to rice husk burning and emissions from coal-fired power stations. This paper presents the recycling of rice husk ash (RHA) and fly ash (FA) from power plants as reactivity materials for producing sustainable (green) concrete. This research aims to investigate the efficiency of RHA and FA replacement ratios on fresh and hardened properties of concrete mixtures. The experimental program consisted of 21 concrete mixtures, which were divided into three groups. The cementitious material contents were 350, 450 and 550 kg m−3 for groups one, two and three, respectively. The replacement ratios from the cement content were 10, 20 and 30% respectively, for each recycle material (RHA and FA). The slump and air contents of fresh concrete were measured. The compressive strength, splitting tensile strength, flexural strength, modulus of elasticity and bond strength of hardened concrete as mechanical properties were also analyzed. The compressive strength was monitored at different ages: 3, 7, 28, 60 and 90 d. The water permeability test of hardened concrete as physical properties was conducted. Test results showed that the RHA and FA enhanced the mechanical and physical properties compared with the control mixture. The cementitious content of 450 kg m−3 exhibited better results than other utilized contents. In particular, the replacement ratios of 10 and 30% of RHA presented higher mechanical properties than those of FA for each group. The water permeability decreased as the cementitious content increased due to the decrease in air content for all mixtures. The water permeability loss ratios increased as the cementitious content decreased.

scholarly journals Behaviour of High Performance Concrete with Multi Compound Composite Cement

2020 ◽  
Vol 9 (1) ◽  
pp. 2405-2411
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Rice Husk ◽  
High Performance ◽  
Rice Husk Ash ◽  
High Performance Concrete ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Split Tensile Strength ◽  
Mix Proportion

This study investigates about the behaviour of high performance concrete produced with multi component composite cements. Here, the cement is partially replaced with certain mineral admixtures. The mineral admixture used in the study are fly ash, rice husk ash, silica fume and ground granulated blast furnace slag in various percentages up to 50%. The mix proportion for fly ash and rice husk ash are kept constant thought the study as 25% and 7.5% respectively. The Mechanical properties such as (Compressive strength, split tensile strength, flexural strength and modulus of elasticity), Durability tests (Acid test, Sorptivity), permeability test and Non Destructive test are performed on M40 grade concrete cube material property, cylinder and prism. The outcomes were analyzed with the controlled mix. The results shown that the M3 mix ( 50% cement, 25% fly ash, 7.5% RHA,7.5 % silica fume and 10 % GGBS) obtained optimum strength, durability and other properties when analyzed with the other mixes.

KOSOVO FLY ASH: UTILIZATION IN CONCRETE AS PARTIAL CEMENT SUBSTITUENT AND THE ENVIRONMENTAL IMPACT

2017 ◽  
Vol 79 (2) ◽  
Author(s):  
Mevlan Qafleshi ◽  
Misin Misini ◽  
Driton R. Kryeziu ◽  
Lulezime Aliko
Keyword(s):  
Fly Ash ◽  
Environmental Impact ◽  
Power Plants ◽  
Thermal Power ◽  
Bottom Ash ◽  
Electrical Energy ◽  
Hardened Concrete ◽  
Environmental Benefit ◽  
Cement Production ◽  
Cement Replacement

In Kosovo, except electrical energy, thermal power plants (TPP) annually produce more than 1.5 Mt of solid waste: Fly Ash (FA) and Bottom Ash (BA). Kosovo’s construction sector annually consumes around 1 Mt of cement. The environmental impact from cement production (consumption) is the emission of around 1 Mt of CO2. The focus of this study is the utilization of FA in concrete as cement replacement, which will indirectly mitigate the CO2 emissions from cement production. The properties of concrete with FA were investigated. For determining the optimum quantity of FA in concrete, four concrete mixes with different content of class C FA were tested. Density and consistence tests of FA fresh concrete, as well as tests of mechanical properties: compressive, tensile and splitting strength of FA hardened concrete specimens were performed. Concrete resistance to permeability was tested by measuring the depth of water penetration under hydrostatic pressure. The correlation between test results of concrete specimens with FA to reference concrete without FA was done. A 30% cement replacement by fly ash showed experimentally to be reasonable. The environmental benefit would be twofold: indirect decrease of 300,000 t of CO2 and removal of 125,000 m3 of industrial waste (FA).      

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

2005 ◽  
Vol 1941 (1) ◽  
pp. 167-174 ◽  
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.

scholarly journals Evaluation of Mechanical and Permeability Characteristics of Microfiber-Reinforced Recycled Aggregate Concrete with Different Potential Waste Mineral Admixtures

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5933
Author(s):  
Rayed Alyousef ◽  
Babar Ali ◽  
Ahmed Mohammed ◽  
Rawaz Kurda ◽  
Hisham Alabduljabbar ◽  
...  
Keyword(s):  
Fly Ash ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Glass Fibers ◽  
Steel Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Superior Performance ◽  
Mineral Admixtures ◽  
Aggregate Concrete

Plain recycled aggregate concrete (RAC) struggles with issues of inferior mechanical strength and durability compared to equivalent natural aggregate concrete (NAC). The durability issues of RAC can be resolved by using mineral admixtures. In addition, the tensile strength deficiency of RAC can be supplemented with fiber reinforcement. In this study, the performance of RAC was evaluated with individual and combined incorporation of microfibers (i.e., glass fibers) and various potential waste mineral admixtures (steel slag, coal fly ash (class F), rice husk ash, and microsilica). The performance of RAC mixtures with fibers and minerals was appraised based on the results of mechanical and permeability-related durability properties. The results showed that generally, all mineral admixtures improved the efficiency of the microfibers in enhancing the mechanical performance of RAC. Notably, synergistic effects were observed in the splitting tensile and flexural strength of RAC due to the combined action of mineral admixtures and fibers. Microsilica and rice husk ash showed superior performance compared to other minerals in the mechanical properties of fiber-reinforced RAC, whereas slag and fly ash incorporation showed superior performance compared to silica fume and husk ash in the workability and chloride penetration resistance of RAC. The combined incorporation of microsilica and glass fibers can produce RAC that is notably stronger and more durable than conventional NAC.

Effect of Microwave Incinerated Rice Husk Ash (MIRHA) on Workability and Compressive Strength of Concrete

2014 ◽  
Vol 935 ◽  
pp. 193-196 ◽  
Author(s):  
Asma Abd Elhsameed ◽  
Nasir Shafiq ◽  
Muhd Fadhil Nuruddin
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Negative Effects ◽  
Concrete Production ◽  
Hardened Properties ◽  
Compressive Strength Of Concrete ◽  
By Products

Agricultural and industrial by-products are commonly used in concrete production as cement replacement materials (CRMs) or as admixtures to enhance both fresh and hardened properties of concrete as well as to save the environment from the negative effects caused by their disposal. This paper presents some findings on the effect of Microwave Incinerated Rice Husk Ash (MIRHA) on workability and compressive strength of concrete. It was obtained that the inclusion of MIRHA as partial replacement of cement could significantly improve the compressive strength of hardened concrete while reducing the workability of fresh concrete.

A Review on Utilization of Fly- Ash and Pond-Ash as a Partial Replacement of Cement in Concrete Mix Design

2018 ◽  
pp. 413-418
Author(s):  
Harshkumar Patel ◽  
Yogesh Patel
Keyword(s):  
Fly Ash ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Strength Test ◽  
Partial Replacement ◽  
Pond Ash ◽  
Research Activities ◽  
Ash Disposal

Now-a-days energy planners are aiming to increase the use of renewable energy sources and nuclear to meet the electricity generation. But till now coal-based power plants are the major source of electricity generation. Disadvantages of coal-based thermal power plants is disposal problem of fly ash and pond ash. It was earlier considered as a total waste and environmental hazard thus its use was limited, but now its useful properties have been known as raw material for various application in construction field. Fly ash from the thermal plants is available in large quantities in fine and coarse form. Fine fly ash is used in construction industry in some amount and coarse fly ash is subsequently disposed over land in slurry forms. In India around 180 MT fly is produced and only around 45% of that is being utilized in different sectors. Balance fly ash is being disposed over land. It needs one acre of land for ash disposal to produce 1MW electricity from coal. Fly ash and pond ash utilization helps to reduce the consumption of natural resources. The fly ash became available in coal based thermal power station in the year 1930 in USA. For its gainful utilization, scientist started research activities and in the year 1937, R.E. Davis and his associates at university of California published research details on use of fly ash in cement concrete. This research had laid foundation for its specification, testing & usages. This study reports the potential use of pond-ash and fly-ash as cement in concrete mixes. In this present study of concrete produced using fly ash, pond ash and OPC 53 grade will be carried. An attempt will be made to investigate characteristics of OPC concrete with combined fly ash and pond ash mixed concrete for Compressive Strength test, Split Tensile Strength test, Flexural Strength test and Durability tests. This paper deals with the review of literature for fly-ash and pond-ash as partial replacement of cement in concrete.

scholarly journals Correction to: Production of eco-friendly concrete incorporating rice husk ash and polypropylene fibres

2021 ◽  
Author(s):  
Muhammad Jaffar Memon ◽  
Ashfaque Ahmed Jhatial ◽  
Ali Murtaza ◽  
Muhammad Saleem Raza ◽  
Karim Bux Phulpoto
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Polypropylene Fibres
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