Ash Concrete Research Articles

Experimental Investigation on Strengthening of Beams using Retrofitting with Partial Replacement of Cement by Sugarcane Bagasse Ash in Concrete

Experimental Investigation on Strengthening of Beams using Retrofitting with Partial Replacement of Cement by Sugarcane Bagasse Ash in Concrete

Study on Partial Replacement of Cement by Saw Dust Ash in Concrete

Study on Partial Replacement of Cement by Saw Dust Ash in Concrete

Coupled effect of superplasticizer dosage and fly ash content on strength and durability of concrete

The incorporation of fly ash in concrete enhanced the durability of portland cement concrete more effectively. Fly ash is incorporated as a mineral admixture because of its advantageous properties like pozzolanic reaction and pore refinement. At the point when fly ash is added in concrete, calcium hydroxide, liberated during cement hydration, reacts with the reactive silica present in fly ash and forms calcium silicate hydrate(C-S-H) gel. This research investigates the influence of fly ash in conjunction with four different superplasticizers (SP) namely Polycarboxylate ether (PCE), Lignosulphonate (LS), Sulphonated Melamine Formaldehyde (SMF) and Sulphonated Naphthalene Formaldehyde (SNF) and on the mechanical and durability properties of concrete. Concrete was made with different levels of class F flyash replacement (0,15, 25, and 35% by mass) of cement, the w/c ratio were maintained constant as 0.37 and the superplasticizer dosage corresponding to saturation dosage. The saturation dosage of superplasticizer is measured by conducting marsh cone and minislump tests. The mechanical and durability properties tested were compressive strength, splitting tensile strength and Sorptivity. PCE based superplasticizers are found to be more effective. Modification in the mechanical by increase in later age strength and durability properties by increase of the concrete was observed with the addition of fly ash and superplasticizer in control mix

Hydration and physical characteristics of ultrahigh-volume fly ash-cement systems with low water/binder ratio

Replacing Portland cement by fly ash in concrete has attracted extensive attention, as this approach is effective in controlling heat release rate, reducing material cost and enhancing greenness. However, only limited studies have been reported on the hydration and physical characteristics of ultrahigh-volume fly ash (UHVFA, fly ash/binder > 60 wt%) concrete. This study aims to explore these characteristics of fly ash–cement systems with low water/binder ratios and a wide range of fly ash replacement levels (from 20% to almost 100%). Even if 80% of the cement was replaced by fly ash, the 28-day compressive strength of the mortar reached over 65 MPa under normal curing conditions, and the total hydration heat was 70% less than that of conventional cement mortar. Moreover, the morphological and micro-aggregate effects of the fly ash were found to play important roles in maintaining adequate strength of the systems, especially for those cases with UHVFA. The findings of this study can support the future designs and applications of sustainable UHVFA concrete.

Effect of fly ash and plastic waste on mechanical and durability properties of concrete

The disposal of polythene waste and fly ash is causing serious threat to the environment. Aim of this study is to decrease environmental pollution by using polythene waste and fly ash in concrete. In this study, cement was partially replaced with 0%, 5%, 10%, 15% and 20% fly ash (by weight) and plastic waste was added in shredded form at 0.6% by weight of concrete. The specimens were prepared for the concrete mix of M25 grade and water to cementitious material ratio (w/c) was maintained as 0.45. Fresh concrete property like workability was examined during casting the specimens. Hardened properties were found out by carrying out the experimental work on cubes, cylinders and beams which were cast in laboratory and their behavior under test were observed at 7 & 28 days for compressive strength and at 28 days for density, flexural strength, dynamic modulus of elasticity, abrasion resistance, water permeability and impact resistance. Overall results of this study show that addition of 0.6% (by weight of the concrete) plastic waste with 10% (by weight of cement) replacement of cement by fly ash result an improvement in properties of the concrete than conventional mix.

Analysis for Compressive Strength with Fly Ash in Concrete

Waste generated by thermal power plants (i.e. fly ash) is one of the major environmental problems. This aim of the research is to investigate the use of fly ash in cement concrete as a partial replacement for cement, as well as an additive for its disposal and environmentally sound reuse. The concrete in the concrete mix is replaced in the varying percentage i.e. from 5 to 25% . It has also observed that the replacing the cement in any proportion will effect the compressive strength and delays in the hardening process. This method provides an environmental friendly method for the disposal of fly ash.

Preliminary Study on the Durability Properties of High-Volume Fly Ash Mortar Composites

Abstract The use of fly ash, a common industrial byproduct waste, is gaining popularity, especially in developing countries, in addressing environmental concerns surrounding the construction industry, such as reducing waste and CO2 emissions. However, the full potential of fly ash usage is yet to be exploited. The physical, mechanical, and durability properties of fly ash in concrete are well documented; in contrast, its durability properties in mortar require further investigations. The present study investigated the durability properties of high-volume fly ash (HVFA) mortar composites. Specifically, varying proportions of sand were replaced with cement and fly ash to examine the effects on the durability properties of the resulting mortar composites by studying the porosity, weight loss upon sodium sulfate attack, and ultrasonic pulse velocity (UPV). Specimens with a diameter of 50 mm and height of 100 mm were examined. The results showed that UPVmortar > UPVpastes. Increasing the amount of cement led to a decrease in weight loss for the 50-, 150-, and 250-mm slumps. The maximum weight loss (15 %) was recorded for the HVFA mortar composites comprising 80 % sand. Furthermore, all prepared samples displayed adequate resistance to sulfate (weight loss was below 16 %). Based on the dry unit weight values, all the final products, aside from that comprising 20 wt. % fly ash and 80 wt. % cement, can be considered as a lightweight material, at ∼12.58 kN/m3, and can satisfactorily be used in the manufacture of lightweight aggregates and semi-isolating materials.

High-performance self-compacting concrete with the use of coal burning waste

Today, thermal power plants are the main producers of energy in Russia. Most of thermal power plants use coal as fuel. The remaining waste of coal burning is ash, In Russia ash is usually kept at dumps. The amount of utilized ash is quite small, less than 13%. Meanwhile, each ash dump is a local ecological disaster. Ash dumps take a lot of place and destroy natural landscape. The use of fly ash in building materials can solve the problem of fly ash dumps in Russia. A lot of papers of scientists are devoted to the use of fly ash as filler in concrete. The main advantage of admixing fly ash in concrete is decrease of amount of used cement. This investigation was held to find out if it is possible to utilize fly ash by its use in high amounts in self-compacting concrete. During experiments three mixtures of SCC with different properties were obtained. The first one is experimental and shows the possibility of obtaining SCC with high compressive strength with 60% of fly ash from the mass of cement. Two other mixtures were optimized with the help of the math planning method to obtain high 7-day and 28-day high compressive strength.

Performance of Ternary Corncob Ash and Anthill Soil Concrete in Sulfate Solutions

Durability of concrete has been defined as its ability to withstand deterioration after it has been exposed to the environment of its intended use. This work examined the performance of ternary Corncob Ash (CCA) and Anthill Soil (AHS) concrete in sodium sulfate (Na2SO4), magnesium sulfate (MgSO4) and combined Na2SO4 and MgSO4 solutions. Bar specimens for elongation tests and cubes for strength deterioration tests were cast using combined CCA and AHS at the 5% replacement, which was earlier on reported to have achieved the highest compressive strength, as well as at the 30% replacement. From the findings, it was concluded that at the 5% replacement, the ternary mix could be used with an advantage over 100% cement concrete in MgSO4 environments.

EFFECTS ON STRENGTH OF CONCRETE BY PARTIAL REPLACEMENT OF CEMENT WITH FLY ASH AND PAPER SLUDGE ASH

In this dissertation study on utilizations of waste paper sludge ash to produce on economic concrete by blending various ratios of cement with waste paper sludge ash along with fly ash there by and to reduce disposal and related pollution problems. The innovative use of waste paper sludge ash in concrete as a supplementary cementitious material along with fly ash explored. The main aim of this study is to evaluate the effects on the proportion of concrete with paper sludge ashafly ash (as partial replacement of cement) in concrete when it is mixed in cement concrete for workability, and strength of concrete using OPC (43 grade). Paper sludge ash is supplementary cementitious material and fly ash is pozzolanic materials that can be utilized to produce highly durable concrete composites. In this study waste paper sludge ash has been used to partially replace OPC which varies from 0% to 15% at interval of 5% by total weight of OPC and similarly cement has been replaced by fly ash which varies 0% to 15% at interval of 5% by total weight of cement in the equal proportion and prepared for M25aM30 grade of concrete. This study investigates the performance of concrete under the influence of paper sludge ash and fly ash in terms of slump and compressive strength at 7 days and 28 days, flexural strength of beam at 28 days and splitting tensile strength of Cylinder at 28 days respectively. The required of specimens of cubes, cylinders and beams were casted for testing to study the influence of paper sludge ashafly ash on concrete. These Concrete specimens were deep cured in water under normal atmospheric conditions in laboratory On the basis of result that paper sludge ash and fly ash mix concrete was found to increase in all strength (Compressive, FlexuralaSplitting Tensile strength) of various mix of concrete at all age when compared to normal concrete. Its use should be promoted for better performance as well as for environmental sustainability. Test results indicate that use of waste paper sludge ash in concrete has improved the performance of concrete.

Replacement of Fine Aggregate with Bottom Ash in Concrete and Investigation on Compressive Strength

Replacement of Fine Aggregate with Bottom Ash in Concrete and Investigation on Compressive Strength

Experimental Investigation on Use of Fly Ash in Concrete for Radioactive Structures for Improved Shielding

Experimental Investigation on Use of Fly Ash in Concrete for Radioactive Structures for Improved Shielding

Mechanical properties of green structural concrete with ultrahigh-volume fly ash

Using a high dosage of fly ash in concrete is an effective approach to control the heat release rate, reduce the material cost and enhance the sustainability. However, ultrahigh-volume fly ash (UHVFA) concrete, with fly ash replacing over 60% of the binder by weight, often exhibits low compressive strength at an early stage, which limits the material to non-structural or semi-structural applications. Though different approaches have been proposed to increase the strength, the efficacy of some of the methods is debatable, because of the high energy consumption and/or low cost-benefit ratio. This study aims to increase the compressive strength of UHVFA concrete by the simple and practical method of reducing the water/binder ratio while adding super-plasticizers to maintain workability. Mortar samples were used to explore the influence of silica fume, and Portland cement was replaced with fly ash at five different percentages (20%, 40%, 60%, 80% and 98%). Mechanical properties up to 360-day age were recorded, and the cementing efficiency factor of the fly ash was studied. With a suitable mix proportion, even with 80% of the binder replaced by fly ash, the compressive strength of the mortar and concrete can reach over 40MPa at 7-day age, and over 60MPa at 28-day age. Compared to commercial Grade 45 concrete, the proposed green structural concrete shows a reduction in CO2 emission of around 70%, a reduction in embodied energy of more than 60%, and a reduction in material cost of 15%.

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF CONCRETE WITH SUNFLOWER SEED HUSK ASH AS PARTIAL REPLACEMENT OF CEMENT

The present study depicts on mechanical properties of concrete withSunflower Seed Husk Ash (SSHA) as partialreplacement of cement. Concrete made with Ordinary Portland Cement is the most widely used material in all thecountries. Hence the production of Ordinary Portland Cement is expensive and ecologically harmful. Cement industriesreleasing huge quantity of CO2which pollute the environment. Structural concrete can be produced using sunflower seedhusk ash to meet strength and other requirements. In this project work, various percentages of SSHA added with concreteandthe mechanical properties where studied. The effects of SSHA as partial replacement of cement on concrete propertieswas investigated. Concrete was produced by adding various amount of SSHA (2.5%, 5%, and 7.5%). From the literaturereview it has been noticed that the replacement of sunflower seed husk ash in concrete was very successful in reducing ofunit weight, compressive strength, splitting tensile strength and freezing-thawing resistance. But water absorption rate isincreased after 28 and 90 days. Based on experimental results its physical and mechanical properties show that concreteproduced with sunflower seed husk ash has great potential as a low cost lightweight building material.

A Comprehensive Review on the Properties of Coal Bottom Ash in Concrete as Sound Absorption Material

The government is currently implementing policies to increase the usage of coal as fuel for electricity generation. At the same time, the dependency on gas will be reduced. In addition, coal power plants in Malaysia produce large amounts of industrial waste such as bottom ash which is collected in impoundment ponds (ash pond). However, millions of tons of coal ash (bottom ash) waste are collected in ponds near power plant stations. Since bottom ash has been classified as hazardous material that threatens the health and safety of human life, an innovative and sustainable solution has been introduced to reuse or recycle industrial waste such as coal bottom ash in concrete mixtures to create a greener and more sustainable world. Bottom ash has the potential to be used as concrete material to replace fine aggregates, coarse aggregates or both. Hence, this paper provides an overview of previous research which used bottom ash as fine aggregate replacement in conventional concrete. The workability, compressive strength, flexural strength, and sound absorption of bottom ash in concrete are reviewed.

EXPERIMENTAL STUDY ON USE OF FLY ASH AS A PARTIAL CEMENT REPLACEMENT IN CONCRETE

Fly ash is a by-product from the coal industry, which is widely available in the world. the use of fly ash in concrete as partial replacement of cement is gaining immense importance today. mainly on account of the improvement in the long-term durability of concrete combined with environmental benefits. The replacement of fly ash as a cementations component in concrete depends upon the design strength, water demand and relative cost of ash compared to cement. This paper reports the results of an experimental investigation carried out to study the effects of fly ash on strength development of concrete and the optimum use of fly ash in concrete. The concrete grade of M15 has been selected and designed as per IS 456-2000 Standard method.Cement was replaced by 10%, 20% and 30% of class F fly ash by the weight. After each mix preparation, nine cubes specimens are cast and cured. Necessary tests were carried out in fresh and hardened concrete. Workability was found from slump test. Tests for compressive strength were carried out on specimens at age 7,14 and 28 days.The test results were compared with the results of specimen prepared after control mix. Test results shows that, inclusion of fly ash generally improves the compressive strength up to certain percent of replacement

STUDY ON MSW INCINERATOR ASH IN CONCRETE WITH PARTIAL REPLACEMENT OF CEMENT IN RC BEAM.

STUDY ON MSW INCINERATOR ASH IN CONCRETE WITH PARTIAL REPLACEMENT OF CEMENT IN RC BEAM.

Preliminary Study of Pressed Lightweight Geopolymer Block Using Fly Ash, Portland Cement and Recycled Lightweight Concrete

In this research, the properties of pressed lightweight fly ash geopolymer concrete block containing Portland cement and recycled lightweight concrete aggregate. The recycled lightweight concrete aggregate (RLCA) was crushed and classified as coarse aggregate (CA), medium aggregate (MA) and fine aggregate (FA). The RLCA with CA : MA : FA of 30 : 30 : 40 by weight was used to reduce the weight of concrete block. Lightweight geopolymer concrete block was produced from lignite fly ash, NaOH, Na2SiO3, RCLA and PC. The lightweight geopolymer concrete blocks with 28-day compressive strengths between 2.0 and 14.1 MPa and densities between 1130 and 1370 kg/m3 were obtained.

Comparative Analysis of Mechanical Properties of Fly-Ash Concrete with Conventional Concrete

Objective: To analyze and study various mechanical properties of fly ash concrete with that of convention concrete and also to check at what percentage of fly-ash gives better and economic result. Methods: The cubes were being tested for their compressive strength using a compression testing machine as per the mix design. USPV is a recognized non-destructive test which is done to evaluate the quality of given concrete sample. It allows us to assess the condition of the ancient structures as well as maintain the quality of new structures. Fire test is carried out to check how concrete withstands all the different types of loads even with the increase in the temperature. Findings: The compressive strength of concrete will increase up to 25% replacement of fly ash and then will subsequently decrease. The compressive strength also reduces if the cement used is old. The workability of the mix increases with the increase in fly ash content even when the water cement ratio is kept constant. USPV Test analysis shows us that there is a better orientation of concrete mix particles with the increase in fly ash content. The packing of lime-fly-ash concrete cubes was found to be best for the ratio of 60% cement and 20% of lime and fly-ash each. Improvement: The use of fly ash in concrete is not a new practice and though much work has already been done in this field, it is a field of continuing research. Also to study the use of other chemicals as a binder material in fly ash concrete, for e.g. sodium silicate, sodium hydroxide etc. We can also study the effect of the addition of various admixtures in fly ash concrete. And also, study the effect of the addition of rice husk in fly ash concrete.

Assessment of hardened characteristics of raw fly ash blended self-compacting concrete

Summary Fly ash is widely used as a supplementary cementitious material in concrete. Due to the implementation of new thermal power plants as a consequence of electricity demand, generation of fly ash is noticeably increased. In addition to pozzolana blended cement production, it is very imperative to use raw fly ash in concrete. Earlier research studies investigated the performance of processed fly ash in blended cement production as well as in concrete. In general, ground fly ash is used in blended cement production. A comprehensive study on the performance evaluation of raw fly ash in self-compacting concrete is not available in the existing literature. Moreover, utilization of raw fly ash in special concrete such as self-compacting concrete is essential to comprehend the performance of raw fly ash blended concrete compared to ordinary Portland concrete. Additionally, it will help to achieve maximum utilization of raw fly ash as a supplementary cementitious material rather than disposal as a waste, which eventually leads to several environmental issues. In the study, raw fly ash was collected and is directly used in development of self-compacting concrete. Two mixes were cast and hardened characteristics of blended concrete were investigated. Results from the study showed comparable performance with control concrete. Furthermore, significant reduction in chloride permeability was observed for raw fly ash blended concrete.