Concrete with Fluidized Bed Combustion Fly Ash Based Light Weight Aggregate

2016 ◽  
Vol 249 ◽  
pp. 8-13
Author(s):  
Rudolf Hela ◽  
Martin Ťažký ◽  
Václav Vachuška ◽  
Tomáš Ťažký
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Fluidized Bed Combustion ◽  
Freezing And Thawing ◽  
Long Time

Conventional high temperature fly ash has been used for manufacturing of construction materials, concrete in particular, for quite a long time. Fluidized bed combustion fly ash, however, has little use in this area, mainly for its chemical composition and morphology. Current efforts are directed towards the development of new technological processes and building materials that would allow the use of this industrial waste and its qualities. One possible way of fluidized bed combustion fly ash’s utilizing in construction industry is the production of cold balled lightweight aggregate. Production of this material is economically advantageous and enables processing of large volumes of raw materials. This paper describes possibilities of using this aggregate for production of lightweight concrete of lower compressive strength classes and consequent testing of durability and resistance to various types of aggressive environment and cyclical freezing and thawing. Physico-mechanical properties and microscopic defects were also studied

Physico-Mechanical Properties of Lightweight Concrete with Fluidized Bed Combustion Fly Ash Based Light Weight Aggregate

2017 ◽  
Vol 908 ◽  
pp. 106-110 ◽  
Author(s):  
Martin Ťažký ◽  
Lenka Bodnárová ◽  
Rudolf Hela
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Fluidized Bed Combustion ◽  
Lightweight Construction ◽  
Technical Parameters ◽  
Light Weight Aggregate

Increasingly we see today among the conventional high temperature fly ash also with the production of fly ash from fluidized bed combustion. These fluidized bed combustions fly ashes, however, have little used this area, mainly for their chemical composition and morphology. Current efforts are directed towards the development of new technological processes and building materials that would allow the use of this industrial waste and its qualities. One possible way of fluidized bed combustion fly ash’s utilizing in construction industries the production of cold balled lightweight aggregate. Production of this material is economically advantageous and enables processing of large volumes of raw materials. This paper describes possibilities of using this aggregate for production of lightweight construction concrete and consequent testing of durability and resistance to various types of aggressive environment. For these lightweight structural concretes, will be verified in their thermal-technical parameters.

Utilization of Circulating Fluidized Bed Combustion (CFBC) Fly Ash and Coal-Fired Fly Ash in Portland Cement

2014 ◽  
Vol 629-630 ◽  
pp. 306-313 ◽  
Author(s):  
Mao Chieh Chi ◽  
Ran Huang ◽  
Te Hsien Wu ◽  
Toun Chun Fou
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Fluidized Bed ◽  
Building Materials ◽  
Circulating Fluidized Bed ◽  
Setting Time ◽  
Fluidized Bed Combustion ◽  
Initial Setting Time ◽  
Cfbc Fly Ash ◽  
Circulating Fluidized Bed Combustion

Circulating fluidized bed combustion (CFBC) fly ash is a promising admixture for construction and building materials due to its pozzolanic activity and self-cementitious property. In this study, CFBC fly ash and coal-fired fly ash were used in Portland cement to investigate the pozzolanic and cementitious characteristics of CFBC fly ash and the properties of cement-based composites. Tests show that CFBC fly ash has the potential instead of cementing materials and as an alternative of pozzolan. In fresh specimens, the initial setting time of mortars increases with the increasing amount of cement replacement by CFBC fly ash and coal-fire fly ash. In harden specimens, adding CFBC fly ash to replace OPC reduces the compressive strength. Meanwhile, CFBC fly ash would results in a higher length change when adding over 30%. Based on the results, the amount of CFBC fly ash replacement cement was recommended to be limited below 20%.

Study of Density and Modulus of Elasticity of Lightweight Concrete with Brazilian Aggregate

2013 ◽  
Vol 467 ◽  
pp. 257-261
Author(s):  
Andressa Fernanda Angelin ◽  
Lubienska Cristina L.J. Ribeiro ◽  
Marta Siviero Guilherme Pires ◽  
Rosa Cristina Cecche Lintz ◽  
Leandro Mouta Trautwein ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Primary Objective ◽  
Experimental Program ◽  
Lightweight Aggregate Concrete ◽  
Portland Cement Concrete ◽  
Concrete Production

Concrete is one of the oldest building materials and applying known to humankind. From 1800s, with the advent of Portland cement concrete has taken a prominent place among the construction materials due to large values of strength, durability and versatility it offered compared to other products, allowing the molding of the various architectural forms. Until the early 80s, the modern concrete remained only as a mixture of cement, aggregates and water, however, in recent decades, due to the development of new techniques and products, the concrete has been undergoing constant changes [. This article discusses the application of technology of lightweight aggregates for concrete production, for use in building elements such as structural panels or fence. Developed an experimental program for the analysis of concrete, with the primary objective to characterize the properties of the parts in the hardened state. The results showed that the lightweight aggregate concrete with Brazilian expanded clay are extremely suitable for the production of prefabricated elements slender, mainly due to the reduction in density and excellent performance in mechanical properties, especially modulus of elasticity, despite the low toughness of lightweight aggregate.

Possibilities of Binding Recycled Glass in Production of Advanced Building Materials

2016 ◽  
Vol 865 ◽  
pp. 255-260
Author(s):  
Martina Reif ◽  
Jiri Zach ◽  
Vítězslav Novák
Keyword(s):  
Thermal Insulation ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Waste Glass ◽  
Raw Material ◽  
Acoustic Properties ◽  
Transportation Engineering ◽  
Advanced Composite Materials

The use of secondary raw material resources for construction purposes currently has a great potential. Secondary raw materials obtained by recycling waste glass find use (among others) in the production of thermal and acoustic insulation, production of lightweight concrete mixes and also in transportation engineering e.g. in road reconstruction.The paper deals with the possibilities of binding lightweight aggregate based on waste glass powder and with the production of advanced composite materials with good thermal insulation and acoustic properties. This means cement, epoxy resin and bituminous matrix with the goal to develop advanced building materials that could find further use as, for example, thermal insulation materials.

Fundamentals of Geopolymers and Related Alkali Activated Materials

2014 ◽  
Vol 803 ◽  
pp. 144-147 ◽  
Author(s):  
J. Temuujin ◽  
A. Minjigmaa ◽  
U. Bayarzul ◽  
Ts. Zolzaya ◽  
B. Davaabal ◽  
...  
Keyword(s):  
Fly Ash ◽  
Building Materials ◽  
Raw Materials ◽  
Construction Materials ◽  
Materials Chemistry ◽  
Low Carbon ◽  
Pond Ash ◽  
Sustainable Usage ◽  
By Products ◽  
Alkali Activated

With the increasing rate of depletion of natural raw materials for production of building materials, their sustainable usage is clearly an important topic for consideration. For instance, 1 tonne ordinary Portland cement (OPC) requires 1.7 tonnes of raw materials, 1.0 tonne of coal and 100 kWh of electricity. One tonne of cement emits 0.8 - 1 tonne of CO2 into atmosphere globally contributing ~5% of total manmade carbon dioxide. Therefore, the development of new, sustainable, low carbon footprint construction materials is an important task for materials scientists and civil engineers. One type of binder that is attracting particular attention around the world is alkali-aluminosilicate chemistry based material the so-called geopolymers. In this presentation we will discuss the fundamentals of geopolymer chemistry and the similarities to and differences from conventional alkali activated materials chemistry. Particular attention will be given to our latest results on the preparation of geopolymer type paste and concrete from fly ash. Mechanical activation of fly ash caused a decrease in porosity with a partial amorphisation of the crystalline constituents. Geopolymer type paste prepared from 30 minute milled Darkhan pond ash showed increase in 7 day compressive strengths by 7 times reaching of 15.4 (4.6) MPa. Keywords: Geopolymer binder, alkali-activated materials, coal combustion by products

scholarly journals Utilization of Construction and Demolition Waste Along with Fly Ash waste in Preparing Non-Autoclaved Aerated Concrete

2020 ◽  
Vol 5 (3) ◽  
pp. 103-109
Author(s):  
Qunshan Wei ◽  
◽  
Kashif Ali Panhwar ◽  
Zuhair Nadeem ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Low Cost ◽  
Thermal Power ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

China’s construction industries are rapidly increasing, and with that generation of Construction and Demolition waste is also growing, and another side industrial waste such as fly ash produced by a thermal power plant, Associated environmental issues, it is essential to utilize in any form; Studies by concrete experts have indicated the feasibility of suitably handling and recycling such waste in new concrete, mainly for basic-level applications. Non-autoclaved aerated concrete is a lightweight substance that could be used as substitute building materials; it is generally made up of raw materials such as Cement, quicklime, gypsum, sand, and expansion agent like an aluminum powder; in this study, 40% waste utilized, Construction and demolition waste (5%,10%,15%,20% ………40%) and Fly ash (35%,30%,25%,20%......0%) accordingly, while expansion agent maintained constant at 0.06%. The compressive strength of the final material checked after (7,14,21 and 28 days) respectively, obtained maximum strength after 28 days; this study goals to design a low cost, Non-autoclaved aerated concrete material and to reuse the waste produced from different sectors, mainly from the construction sector Keywords: Non-Autoclaved concrete, Lightweight concrete, Eco-friendly, Construction and Demolition waste, Fly ash

Characteristics of Artificial Lightweight Aggregate by Using Magnetic Separated Desulfurized Fly Ash and Dredged Soil

2012 ◽  
Vol 724 ◽  
pp. 119-122
Author(s):  
Yoo Taek Kim ◽  
Chang Sub Jang ◽  
Ki Gang Lee ◽  
Joon Seong Lee
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Magnetic Separation ◽  
Glass Phase ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Physical Property ◽  
Lightweight Aggregate ◽  
Dredged Soil ◽  
Coal Power

This research concerns the characteristics of ALA made of magnetically separated desulfurized fly ash (DFA) generated from the coal power plant having fluidized bed type boiler. Being believed that these alkali-rich components could be separated by magnetic separation, desulfurized fly ash was separated by using 10,000 Gauss magnets as magnetic desulfurized fly ash (MDFA) and non-magnetic desulfurized fly ash (DFA). The dependence of composition and sintering temperature on physical property of ALA was studied. It seems to be apparent that the glass phase which is one of the main problems in the ALA manufacturing process could not be controlled by the magnetic separation only, but the formation of pores could be considerably controlled by the magnetic separation. It is also clear that neither DFA nor MDFA can be used as raw materials for making ALA; however, magnetic separation of desulfurized fly ash from fluidized bed type boiler is effective to collect bloating components for self-bloating of ALA without addition of an extra bloating agent.

scholarly journals Influence of Lightweight Aggregate Concrete Materials on Building Energy Performance

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 94
Author(s):  
Tara L. Cavalline ◽  
Jorge Gallegos ◽  
Reid W. Castrodale ◽  
Charles Freeman ◽  
Jerry Liner ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Energy Savings ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Building Energy ◽  
Energy Performance ◽  
Energy Simulation ◽  
Building Energy Simulation ◽  
Building Energy Performance

Due to their porous nature, lightweight aggregates have been shown to exhibit thermal properties that are advantageous when used in building materials such as lightweight concrete, grout, mortar, and concrete masonry units. Limited data exist on the thermal properties of materials that incorporate lightweight aggregate where the pore system has not been altered, and very few studies have been performed to quantify the building energy performance of structures constructed using lightweight building materials in commonly utilized structural and building envelope components. In this study, several lightweight concrete and masonry building materials were tested to determine the thermal properties of the bulk materials, providing more accurate inputs to building energy simulation than have previously been used. These properties were used in EnergyPlus building energy simulation models for several types of commercial structures for which materials containing lightweight aggregates are an alternative commonly considered for economic and aesthetic reasons. In a simple model, use of sand lightweight concrete resulted in prediction of 15–17% heating energy savings and 10% cooling energy savings, while use of all lightweight concrete resulted in prediction of approximately 35–40% heating energy savings and 30% cooling energy savings. In more complex EnergyPlus reference models, results indicated superior thermal performance of lightweight aggregate building materials in 48 of 50 building energy simulations. Predicted energy savings for the five models ranged from 0.2% to 6.4%.

scholarly journals The Influence of Cement Substitution by Biomass Fly Ash on the Polymer–Cement Composites Properties

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3079
Author(s):  
Beata Jaworska ◽  
Dominika Stańczak ◽  
Joanna Tarańska ◽  
Jerzy Jaworski
Keyword(s):  
Fly Ash ◽  
Building Materials ◽  
Raw Materials ◽  
Combustion Process ◽  
Biomass Combustion ◽  
Cement Composites ◽  
Cement Mortars ◽  
Mineral Additive ◽  
Biomass Fly Ash

The generation of energy for the needs of the population is currently a problem. In consideration of that, the biomass combustion process has started to be implemented as a new source of energy. The dynamic increase in the use of biomass for energy generation also resulted in the formation of waste in the form of fly ash. This paper presents an efficient way to manage this troublesome material in the polymer–cement composites (PCC), which have investigated to a lesser extent. The research outlined in this article consists of the characterization of biomass fly ash (BFA) as well as PCC containing this waste. The characteristics of PCC with BFA after 3, 7, 14, and 28 days of curing were analyzed. Our main findings are that biomass fly ash is suitable as a mineral additive in polymer–cement composites. The most interesting result is that the addition of biomass fly ash did not affect the rheological properties of the polymer–cement mortars, but it especially influenced its compressive strength. Most importantly, our findings can help prevent this byproduct from being placed in landfills, prevent the mining of new raw materials, and promote the manufacture of durable building materials.

scholarly journals Highly Effective Adsorption Process of Ni(II) Ions with the Use of Sewage Sludge Fly Ash Generated by Circulating Fluidized Bed Combustion (CFBC) Technology

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3106
Author(s):  
Tomasz Kalak ◽  
Kinga Marciszewicz ◽  
Joanna Piepiórka-Stepuk
Keyword(s):  
Fly Ash ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Fluidized Bed Combustion ◽  
Nickel Ions ◽  
Suitable Material ◽  
Circulating Fluidized Bed Combustion

Recently, more and more attention has been paid to the removal of nickel ions due to their negative effects on the environment and human health. In this research, fly ash obtained as a result of incineration of municipal sewage sludge with the use of circulating fluidized bed combustion (CFBC) technology was used to analyze the possibility of removing Ni(II) ions in adsorption processes. The properties of the material were determined using analytical methods, such as SEM-EDS, XRD, BET, BJH, thermogravimetry, zeta potential, SEM, and FT-IR. Several factors were analyzed, such as adsorbent dose, initial pH, initial concentration, and contact time. As a result of the conducted research, the maximum sorption efficiency was obtained at the level of 99.9%. The kinetics analysis and isotherms showed that the pseudo-second order equation model and the Freundlich isotherm model best suited this process. In conclusion, sewage sludge fly ash may be a suitable material for the effective removal of nickel from wastewater and the improvement of water quality. This research is in line with current trends in the concepts of circular economy and sustainable development.

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