Engineering and environmental evaluation for utilization of recycled pulp mill fly ash as binder in sustainable road construction

2021 ◽  
Vol 298 ◽  
pp. 126758 ◽  
Author(s):  
Chinchu Cherian ◽  
Sumi Siddiqua
Keyword(s):  
Fly Ash ◽  
Pulp Mill ◽  
Road Construction ◽  
Environmental Evaluation ◽  
Recycled Pulp

Characterization and use of pulp mill fly ash and lime by-products as road construction amendments

2000 ◽  
Vol 27 (3) ◽  
pp. 581-593 ◽  
Author(s):  
Hongde Zhou ◽  
Daniel W Smith ◽  
David C Sego
Keyword(s):  
Fly Ash ◽  
Solid Waste Management ◽  
Paper Industry ◽  
Pulp Mill ◽  
Road Construction ◽  
Waste Utilization ◽  
Waste Streams ◽  
Curing Conditions ◽  
Environmental Properties ◽  
By Products

Fly ash and lime by-products are the two main waste streams generated by the pulp and paper industry. Traditionally, these wastes are disposed of either in surface impoundment or landfills. Greater environmental concerns and limited land availability have made these disposal practices increasingly unacceptable and costly. Thus, the objective of this study was to determine the feasibility of beneficial utilization alternatives with emphasis on their use as road construction amendment materials based on technical, economical, and environmental considerations. The experiments were conducted to comprehensively characterize the chemical, physical, engineering, and environmental properties for both waste samples and their mixtures prepared with local soils at different curing conditions. Field road tests were then conducted to verify and assess the performance of the mixtures in terms of load bearing capacity, serviceability, and compaction. The results showed that pulp mill wastes would have little adverse environmental impact and could be used as road construction amendments to improve soil strength and reduce deformation. This improvement was significantly affected by soil types, moisture contents, and waste addition rates. During waste-soil amendment, the metal leachability would be further reduced by the occurrence of solidification processes.Key words: wood ash, fly ash, lime by-products, solid waste management, pulp mill waste, waste utilization, leaching tests.

scholarly journals Utilization of Red Mud-Fly Ash Reinforced with Cement in Road Construction Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Sarath Chandra K ◽  
Krishnaiah S ◽  
Kibebe Sahile
Keyword(s):  
Fly Ash ◽  
Red Mud ◽  
Industrial Waste ◽  
Construction Material ◽  
Road Construction ◽  
Dry Weight ◽  
Strength Properties ◽  
Environmental Threat ◽  
The Right ◽  
The Impact

Industrialization is the key to the growth of any country’s economy. However, on the other hand, the production of industrial waste is increasing enormously, which adversely impacts the environment and natural resources. Red mud is also a widespread industrial waste produced during aluminium extraction from bauxite ore in Bayer’s process. Red mud is a highly alkaline material that creates a massive environmental threat in nature. To reduce the impact of this solid waste material, the ideal method is to use it in construction works with appropriate stabilization. This study envisages the strength properties of red mud with fly ash and cement to use it as a road construction material in the subgrade. The influence of fly ash and cement on improving the strength properties of red mud was studied in detail by replacing red mud with 10%, 20%, and 30% with fly ash and 1%, 3%, and 5% of cement to its dry weight. The CBR (California bearing ratio) value was increased from 1.58% to 11.6% by stabilizing red mud with fly ash and cement, which can be used as a road construction material. The UCS (unconfined compressive strength) of red mud was increased from 825 kPa to 2340 kPa upon curing for 28 days with the right mix of fly ash and cement. Along with the strength properties, the chemical analysis of leachate for the best suitable mix was performed according to the TCLP method to understand the hazardous materials present in the red mud when it is injected as ground material. Both strength properties and the leachate characteristics prove that the red mud with suitable fly ash and cement is an excellent material in road constructions.

scholarly journals Road Construction by using Rolled Compacted Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 673-678
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Road Construction ◽  
Normal Concrete ◽  
Low Traffic

Rolled compacted concrete (RCC) is important of newly technique in construction of pavement. that can be employed in low traffic or high trafficked roads. Due to its inexpensive, quick creation , durable and low maintenance RCC is becoming more commonly gradually . If the UHPC compared to normal concrete has some privilege such as plenty stability and supreme permanence however the utilization of it is restricted owing to its expensiveness and minimal cods for design.. Its constancy leads to its stay persistent when subjected to vibratory compacter, since it has sufficient wetting so it causes permit enough mixing and repartition of paste without segregation. Fly ash, silica fume and some admixture can be utilized to concrete to decrease the quantity of water cand generate high arid mixture.

Influence of the Mechanical Activation of Fly Ash on Strength of Ground Concrete Based on Waste Production

2021 ◽  
Vol 25 (11) ◽  
pp. 36-41
Author(s):  
D.V. Bespolitov ◽  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Equilibrium Condition ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Waste Production ◽  
Direct Use ◽  
Silicon Oxygen ◽  
Physical And Mechanical Characteristics

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.

Ash Recycling: Just a Dream?

2004 ◽  
Author(s):  
Heiner Zwahr
Keyword(s):  
Fly Ash ◽  
Waste Management ◽  
Road Construction ◽  
Waste Incineration ◽  
Waste To Energy ◽  
Incineration Plant ◽  
Material Recovery ◽  
Concrete Production ◽  
Scrap Iron ◽  
Energy Plants

Waste to energy is only one way of handling waste, material recovery is another aspect of sustainable waste management. This is actually nothing new and has always been part of the operation of WTE (Waste to Energy) plants in Hamburg. In descriptions of the first waste incineration plant in Hamburg, which started operation in 1896, it was stated that “the fly ash” collected in the ash chambers was used as filler material for the insulation of ceiling cavities. Its use in the sandwich walls of money safes was expressly recommended by the members of the urban refuse collection authority. Another lucrative trade was the sorting of scrap iron. It was separated from the incineration slag with magnets. The slag itself was said to be as sterile as lava, as hard as glass, as useful as bricks, and it was a profitable side product of waste incineration. The crushed incinerator slag was evidently so much in demand in road construction and as an aggregate in concrete production that demand could often not be met in the building season, even though it was stored through the winter, [1,2,3].

scholarly journals Upcycling Potential of Industrial Waste in Soil Stabilization: Use of Kiln Dust and Fly Ash to Improve Weak Pavement Subgrades Encountered in Michigan, USA

2020 ◽  
Vol 12 (17) ◽  
pp. 7226 ◽  
Author(s):  
Nishantha Bandara ◽  
Hiroshan Hettiarachchi ◽  
Elin Jensen ◽  
Tarik H. Binoy
Keyword(s):  
Fly Ash ◽  
Soil Stabilization ◽  
Positive Impact ◽  
Road Construction ◽  
The United States ◽  
Soil Types ◽  
Cement Kiln ◽  
Weak Soil ◽  
Industrial Byproducts ◽  
Kiln Dust

The State of Michigan in the United States often encounters weak soil subgrades during its road construction and maintenance activities. Undercutting has been the usual solution, while a very few attempts of in-situ soil stabilization with cement or lime have been made. Compared to the large volume of weak soils that require improvement and the cost incurred on an annual basis, some locally available industrial byproducts present the potential to become effective soil subgrade stabilizers and a better solution from the sustainability perspective as well. The candidate industrial byproducts are Cement Kiln Dust (CKD), Lime Kiln Dust (LKD), and Fly Ash (FA), out of which only a fraction is currently used for any other secondary purposes while the rest is disposed of in Michigan landfills. This manuscript describes a laboratory investigation conducted on above industrial byproducts and/or their combinations to assess their suitability to be used as soil subgrade stabilizers in three selected weak soil types often found in Michigan. Results reveal that CKD or a combination of FA/LKD can be recommended for the long-term soil subgrade stabilization of all three soil types tested, while FA and LKD can be used in some soil types as a short-term soil stabilizer (for construction facilitation). A brief discussion is also presented at the end on the potential positive impact that can be made by the upcycling of CKD/LKD/FA on sustainability.

Opportunities for Composites from Recycled Wood Based Resources

1992 ◽  
Vol 266 ◽  
Author(s):  
Theodore H. Wegner ◽  
John A. Youngquist ◽  
Roger M. Rowell
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Wood Fiber ◽  
Pulp Mill ◽  
Waste Stream ◽  
Waste Materials ◽  
Demolition Waste ◽  
Waste Wood ◽  
Agriculture Wastes

AbstractA reduction is urgently needed in the quantities of industrial and municipal solid waste materials that are currently being landfilled. Major components of municipal solid waste include waste wood, paper, agriculture wastes, and other biomass fibers. In 1990, there were approximately 80 million tons of 6,000 different paper and paperboard products and 5.8 million tons of wood in the municipal solid waste stream. There are also potential millions of tons of wood fiber in timber thinnings, industrial wood waste, demolition waste, pallets, and pulp mill sludges. These materials offer great opportunities as recycled ingredients in wood-based composites. This paper discusses possibilities for manufacturing selected composites from these materials as well as materials which coexist with the wood-based resources such as plastics, fly ash, and gypsum.

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