Evaluation of Flexural and Shear Behaviors of Lightweight Concrete Eco-Thermal Panel with Bottom Ash Aggregate and Air Foam

2021 ◽  
Vol 33 (3) ◽  
pp. 245-251
Author(s):  
Keun-Hyeok Yang ◽  
Ju-Hyun Mun
Keyword(s):  
Lightweight Concrete ◽  
Bottom Ash ◽  
Shear Behaviors

scholarly journals MINERALOGY AND ORGANIC MATTER CONTENT OF BOTTOM ASH SAMPLES FROM AGIOS DIMITRIOS POWER PLANT, GREECE

2004 ◽  
Vol 36 (1) ◽  
pp. 320 ◽  
Author(s):  
N. Kantiranis ◽  
Α. Georgakopoulos ◽  
A. Fiiippidis ◽  
A. Drakoulis
Keyword(s):  
Organic Matter ◽  
Power Plant ◽  
Lightweight Concrete ◽  
Inorganic Compounds ◽  
Amorphous Material ◽  
Bottom Ash ◽  
Organic Matter Content ◽  
Mineralogical Composition ◽  
Matter Content ◽  
Loss On Ignition

Four bottom ash samples from the Power Units of the Agios Dimitrios Power Plant were studied by the method of PXRD to determine their semi-quantitative mineralogical composition. Their organic matter content was calculated by a wet chemical process. Also, the loss on ignition was measured. The samples are constituted mainly of calcite, quartz and feldspars, while micas, clays, gehlenite and portlandite were determined in a few samples in smaller quantities. The amorphous material varied between 10-43 wt. %, while organic matter varied between 5-42 wt. %. Measurements of the loss on ignition overestimate the unburned lignite contents in the bottom ash samples. The management of bottom ashes with high contents of unburned lignite should differ to that of the fly ashes. The oxidation of the inorganic compounds of the unburned lignite may lead to environmental degradation of the landfill areas. Samples showing lower values of organic matter are suitable for a series of uses, such as: snow and ice control, as an aggregate in lightweight concrete masonry units,as a raw feed material for portland cement, as an aggregate in cold mix emulsified asphalt mixes, base or sub-base courses, or in shoulder construction. Systematic study of the unburned lignite of bottom ashes is needed for possible re-combustion.

A Review on the Effect of Fly Ash, RHA and Slag on the Synthesizing of Coal Bottom Ash (CBA) Based Geopolymer

2021 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Nor Farhana Binti Ab Gulam ◽  
A. B. M. Amrul Kaish ◽  
Abir Mahmood ◽  
Sudharshan N. Raman ◽  
Maslina Jamil ◽  
...  
Keyword(s):  
Fly Ash ◽  
Erosion Resistance ◽  
Rice Husk Ash ◽  
Lightweight Concrete ◽  
Bottom Ash ◽  
Curing Temperature ◽  
Curing Time ◽  
Construction Sector ◽  
Coal Bottom Ash

Geopolymerization is widely used in the construction sector for its characteristics of strong compressive strengths, quick hardening, long-term durability, fire resistance, and erosion resistance. This paper has gone through the geopolymer performances utilizing coal bottom ash (CBA), CBA blended with fly ash (FA), CBA mixed together with slag, and CBA with rice husk ash (RHA). CBA shows a better performance than FA in the compressive strength. This paper has discovered several elements that influence geopolymerization, the curing time, the curing temperature, the silicate and hydroxide ratio, and grinding CBA surfaces. The combination of CBA and RHA is suitable for lightweight concrete, as the range of the volumetric weight is within 1192 kg/m3 to 1655 kg/m3. The slump result decreases, as the ratio of CBA and slag increases. Slag particles are uneven in shape, which increases water consumption and leads to a honeycombed structure, whereas CBA particles are spherical in shape, which enhances workability.

Microstructure Stability and Thermal Resistance of Ash-Based Geopolymer with Sodium Silicate Solution at High Temperature

2021 ◽  
Vol 53 ◽  
pp. 101-111
Author(s):  
Hoc Thang Nguyen
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Sodium Silicate ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Bottom Ash ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Engineering Properties ◽  
Microstructural Stability

Current cement-based building materials have a huge disadvantage that they are easily broken due to thermal decomposition at high temperature (over 500°C) of structures of hydrated cement. This is easily observed at construction works when burned, the cement-based mortar and concrete materials and plaster are susceptible to collapse causing damage to buildings or structures. More seriously, these accidents easily cause injuries or loss of life for residents and people working there. Therefore, research on fire resistance and structural stability at high temperatures of building materials is always an interested topic of many scientists. This study utilized resources of highly active alumino silicate materials such as coal bottom ash and rice husk ash to produce geopolymer using sodium silicate solution as an alkaline activator. The ash-based geopolymer has good engineering properties responding to requirements of ASTM C55 and C90 for lightweight concrete brick. It is interesting to note that the geopolymer product was tested for thermal properties at 1000°C such as heat resistance, volumetric shrinkage, mass loss. The experimental results show that the ash-based geopolymer material has high thermal stability with increasing significantly of compressive strength after heated at 1000°C. Moreover, the geopolymer was also carried out to characterize microstructure before and after exposed at high temperature using methods of X-ray diffraction (XRD), scanning electron microscope (SEM). Thermal analysis methods such as thermogravimetric (TG), differential thermal analysis (DTA), and dilatometry-thermal expansion (CTE) were used to evaluate microstructural stability of the geopolymer-based materials.

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