scholarly journals Eco-Geopolymers: Physico-Mechanical Features, Radiation Absorption Properties, and Mathematical Model

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 262
Author(s):  
Neslihan Doğan-Sağlamtimur ◽  
Ahmet Bilgil ◽  
Sefa Ertürk ◽  
Vakkas Bozkurt ◽  
Elif Süzgeç ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Curing Temperature ◽  
Spherical Particles ◽  
Radiation Absorption ◽  
Key Factors ◽  
Alkali Activator ◽  
Developed Surface

Waste ashes and radiation are hazardous environmental and health factors; thus, a lot of attention is paid to their reduction. We present eco-geopolymer building materials (GPBMs) based on the class F fly ashes (FFAs) from thermal power plants (TPPs) and their implementation as a barrier against radioactive radiation. Different methods of production, ratios of FFA to alkali activator, and temperatures of curing were tested. Small spherical particles and higher content of SiO2 resulted in developed surface area and higher reactivity of Isken TPP FFA than Catalagzi TPP FFA. Lower activator concentration (10% vs. 20%) and curing temperature (70 vs. 100 °C) caused an increase in GPBM compressive strength; the highest value was measured as 93.3 MPa. The highest RA was measured for GPBMs, provided alkali activator ratio (Na2SiO3/NaOH) was >2 and its concentration was 20%. The mathematical model developed in this study proved FFA quantity, and thus GPBM mechanical properties, as key factors influencing RA. In the light of these results, the lightweight GPBMs can be excellent materials for the construction sector dedicated to immobilization, storage, and disposal for radionuclides or barriers against radiation; however, multiple steps of their production require careful optimization.

scholarly journals Environmentally Friendly Geopolymer Building Material: Production, Determination of Physical-Mechanical-Radiation Absorption Properties and Mathematical Model Approach

2021 ◽  
Author(s):  
Neslihan DOGAN-SAGLAMTIMUR ◽  
Ahmet Bilgil ◽  
Sefa Ertürk ◽  
Vakkas Bozkurt ◽  
Elif Süzgeç ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Compressive Strength ◽  
Building Material ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Curing Temperature ◽  
Radiation Absorption ◽  
Unit Weight ◽  
Sieve Analysis

Abstract Waste ashes and radiation cause important environmental and health problems. Therefore, reduction of their amount is vital. In this study, physical-mechanical and radiation absorption (RA) properties of eco-friendly alkali (NaOH and Na2SiO3) activated geopolymer building material (GPBM) produced by using the industrial solid waste class F fly ashes (FFAs) are determined. The FFAs were supplied from thermal power plants operating in Zonguldak and Adana (Turkey). The sieve analysis, loose/tight unit weight and loss on ignition analysis of the FFAs was conducted. Different FFAs and alkali activator amounts were used for making GPBMs. After thermal curing in a laboratory oven at 70 °C and 100 °C, the produced GPBMs were kept to cool off to room temperature. Afterwards, compressive and flexural strengths, water absorption, porosity tests and RA measurements were performed. Influence of several parameters (FFA types, curing temperature and alkali ratios) on the RA properties of GPBM is discussed in this paper. According to the mathematical model developed in this study, the effect of FFAs supplied from different TPPs onto RA (%) is an important issue. Because FFA quantity causes to increase RA (%) with respect to the composed mathematical model. The FFA-based GPBMs, which have a compressive strength of more than 30 MPa, have higher radiation absorption (>12%) than ordinary Portland cement-based conventional building materials (9.52%). The highest compressive strength and RA percentage were measured as 93.3 MPa and 12.54%, respectively, for the GPBMs that are (properly) suited for the construction sector.

TRACE ELEMENT ANALYSIS OF FLY ASH BY PIXE

1999 ◽  
Vol 09 (03n04) ◽  
pp. 417-422 ◽  
Author(s):  
V. VIJAYAN ◽  
S. N. BEHERA
Keyword(s):  
Fly Ash ◽  
Trace Element ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Trace Element Analysis ◽  
Chemical Properties ◽  
Solid Material ◽  
Thermal Power Plants ◽  
Element Analysis

Fly ash is a major component of solid material generated by the coal-fired thermal power plants. In India the total amount of fly ash produced per annum is around 100 million tonnes. Fly ash has a great potential for utilization in making industrial products such as cement, bricks as well as building materials, besides being used as a soil conditioner and a provider of micro nutrients in agriculture. However, given the large amount of fly ash that accumulate at thermal power plants, their possible reuse and dispersion and mobilization into the environment of the various elements depend on climate, soils, indigenous vegetation and agriculture practices. Fly ash use in agriculture improved various physico-chemical properties of soil, particularly the water holding capacity, porosity and available plant nutrients. However it is generally apprehended that the application of large quantity of fly ash in fields may affect the plant growth and soil texture. Hence there is a need to characterize trace elements of fly ash. The results of trace element analysis of fly ash and pond ash samples collected from major thermal power plants of India by Particle Induced X-ray Emission (PIXE) have been discussed.

Pressed Composites Based on Gypsum and Magnesia Binders Modified with Secondary Resources

2020 ◽  
Vol 1011 ◽  
pp. 52-58
Author(s):  
A. Kaklyugin ◽  
Nonna Stupen ◽  
Lubov Kastornykh ◽  
Viktor Kovalenko
Keyword(s):  
Power Plants ◽  
Building Materials ◽  
Water Resistance ◽  
Calcium Phosphates ◽  
Thermal Power ◽  
Building Envelope ◽  
Secondary Resources ◽  
Combined Structure ◽  
Fine Crystalline Structure ◽  
Artificial Stone

The results of the studies aimed at increasing the water resistance of the pressed building materials based on gypsum and magnesia binders due to their modification with active dispersed fillers from secondary resources are presented. The gypsum binder modification was carried out by the joint introduction of carbonate-containing sludge from it into the chemical treatment of thermal power plants and monoammonium phosphate, and of magnesia cement - silica fume and finely ground burnt mines. Physical and mechanical characteristics of the materials’ control samples were determined according to the standards and generally accepted methods. The increase in water resistance of the pressed modified composites was evaluated by changing the softening coefficient. It is shown that when using gypsum binders, an increase in the water resistance of products based on them can be achieved by changing the structure formation of the pressed material and the formation on the elements’ surface of its fine-crystalline structure of the sparingly soluble calcium phosphates’ screening protective films. The increase in water resistance of pressed products made of modified magnesia binders is explained by the appearance of insoluble hydro silicates, hydro aluminates and hydro aluminosilicates of magnesium, in the structure of the hardened artificial stone as well as the formation of a complex combined structure containing coagulation, condensation and crystallization phases. The technical characteristics of the materials obtained are sufficient for their use, in particular, in the building envelope. The possibility of replacing a significant amount of binders with secondary resources has been identified. This allows not only to increase the water resistance of the pressed products on the basis of the proposed modified binders, but also to reduce their cost, as well as free up the land allocated for dumps.

Utilization of Waste from Thermal Power Plants in High Performance Materials’ Production

2020 ◽  
Vol 1011 ◽  
pp. 109-115
Author(s):  
Inna Maltseva ◽  
Svetlana Kurilova ◽  
Alexey Naumov
Keyword(s):  
Environmental Pollution ◽  
Waste Disposal ◽  
High Performance ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Environmental Problems ◽  
Thermal Power Plants ◽  
Operational Characteristics

One of the effective ways to solve the environmental problems of the region at present is the waste disposal from Novocherkasskaya TPP, one of the largest sources of environmental pollution. The solution to this problem is associated with the integrated use of ash and slag mixtures components in the effective building materials’ production. On the TPP waste basis, the authors obtained structural and heat-insulating concrete with enhanced physical, mechanical and operational characteristics.

Thermal Insulation Materials With High-Porous Structure Based on the Soluble Glass and Technogenic Mineral Fillers

2018 ◽  
Vol 7 (3.2) ◽  
pp. 692
Author(s):  
Dmytro Storozhenko ◽  
Oleksandr Dryuchko ◽  
Teofil Jesionowski
Keyword(s):  
Thermal Insulation ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Raw Material ◽  
Thermal Engineering ◽  
Preparation Methods ◽  
Insulation Materials ◽  
Soluble Glass ◽  
Study Results

The raw material mixture from the silicon-like technogenic component the ash-removal of thermal power plants and the preparation methods of  waterproof porous heat-insulated materials wide usage for raw mass hot foaming powdered two-stage technology are developed. The development uses the polyfunctional properties of liquid glass  as a) the binder component; c) breeder; c) the speed regulator of the clamping mass hardenin. Its optimized version begins to solidify at its usual temperature from the moment its "reproduction" is soluble glass and forms a paste-shaped cake with a set of properties necessary for the next fragmentation. The proposed formulation allows compositions processing in various ways, with the formation of granular heat-insulating fillers, materials for thermal insulation in complex structures, slab and shell-like types of thermal insulation materials. The task is set, depending on the goals and features of the tasks being solved; it is possible to conduct several different methods at the final stages of their obtaining. Two stages of the recycling process determine the character and behavior of the rare-glass composite systems constituent components during heat treatment, their strong adhesion to most structural materials and the need to solve billets easy removal problem from the molding unit. Study results can be used in the field of building materials production, in particular porous artificial products, in obtaining granular insulating material and light aggregate for concrete industrial and civil construction, in thermal engineering as thermal insulation, etc.   

scholarly journals Using thermal power plants waste for building materials

2017 ◽  
Vol 87 ◽  
pp. 092010 ◽  
Author(s):  
R S Feduik ◽  
A K Smoliakov ◽  
R A Timokhin ◽  
V O Batarshin ◽  
Yu G Yevdokimova
Keyword(s):  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Thermal Power Plants

The Analysis of Integrated Financial Capacity of the Power Plant

2012 ◽  
Vol 450-451 ◽  
pp. 1383-1386
Author(s):  
Shu Liang Liu ◽  
Yun Xia Song
Keyword(s):  
Mathematical Model ◽  
Power Plant ◽  
Economic Benefit ◽  
Power Plants ◽  
Comprehensive Evaluation ◽  
Thermal Power ◽  
Fuzzy Comprehensive Evaluation ◽  
Thermal Power Plants ◽  
Financial Capacity ◽  
Power Plant Operation

The stand or fall of power plant operation is extremely important, so we need to analyze the comprehensive financial capacity of power plant. This paper evaluates the economic benefit of Datang Baoding thermal power plants' expansion project based on the fuzzy comprehensive evaluation mathematical model, to determine the effectiveness of the project after implementation.

Study on the Countermeasures of SO2 Emission Reduction in Chengdu Economic Circle

2013 ◽  
Vol 807-809 ◽  
pp. 1388-1396
Author(s):  
Wen Yong Wang ◽  
Bo Jun Ke ◽  
Gao Ping Fu
Keyword(s):  
Air Quality ◽  
Chemical Industry ◽  
Power Plants ◽  
Building Materials ◽  
Thermal Power ◽  
Ambient Air ◽  
Average Concentration ◽  
National Standard ◽  
Thermal Power Plants ◽  
Industrial Enterprises

Based on a detailed survey on the source and volume of SO2 emission over Chengdu economic circle, the third-generation air quality model CMAQ is adopted for simulating the concentration of SO2 in the air over Chengdu Economic Circle. The results show that the hourly average concentration, daily average concentration and annual average concentration of SO2 in air exceed the limit of national standard, and the affected areas respectively account for 0.12%, 0.18% and 0.03% of the total area of the economic circle. Meanwhile, according to the result of calculation, the SO2 emissions of thermal power plants, chemical industry, building materials plants and industrial area sources make the largest contribution to the SO2 concentration in the air, with ratios of 36.15%, 18.67%, 11.81% and 8.34% respectively. thus,main measures to reduce emissions of SO2 in Chengdu economic circle are proposed as follows: focusing on the control of the emissions of SO2 from industrial enterprises, especially in the thermal power plants, chemical industry, building materials plants as well as industrial boilers; joint prevention and control measures should be implemented between the cities, so as to reduce the interaction caused dy emissions of SO2. With the application of the above measures, the total SO2 emissions can be reduced by 50% and the concentration of SO2 in the air can meet with the Class II of national ambient air quality Standard.

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