scholarly journals Use of Coal Bottom Ash and CaO-CaCl2-Activated GGBFS Binder in the Manufacturing of Artificial Fine Aggregates through Cold-Bonded Pelletization

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5598
Author(s):  
Dongho Jeon ◽  
Woo Sung Yum ◽  
Haemin Song ◽  
Seyoon Yoon ◽  
Younghoon Bae ◽  
...  
Keyword(s):  
Early Stage ◽  
Bottom Ash ◽  
Relative Weight ◽  
Main Reaction ◽  
Reaction Products ◽  
Coal Bottom Ash ◽  
Heavy Metal Leaching ◽  
Granulated Blast Furnace Slag ◽  
Fine Aggregates ◽  
Cementless Binder

This study investigated the use of coal bottom ash (bottom ash) and CaO-CaCl2-activated ground granulated blast furnace slag (GGBFS) binder in the manufacturing of artificial fine aggregates using cold-bonded pelletization. Mixture samples were prepared with varying added contents of bottom ash of varying added contents of bottom ash relative to the weight of the cementless binder (= GGBFS + quicklime (CaO) + calcium chloride (CaCl2)). In the system, the added bottom ash was not simply an inert filler but was dissolved at an early stage. As the ionic concentrations of Ca and Si increased due to dissolved bottom ash, calcium silicate hydrate (C-S-H) formed both earlier and at higher levels, which increased the strength of the earlier stages. However, the added bottom ash did not affect the total quantities of main reaction products, C-S-H and hydrocalumite, in later phases (e.g., 28 days), but simply accelerated the binder reaction until it had occurred for 14 days. After considering both the mechanical strength and the pelletizing formability of all the mixtures, the proportion with 40 relative weight of bottom ash was selected for the manufacturing of pilot samples of aggregates. The produced fine aggregates had a water absorption rate of 9.83% and demonstrated a much smaller amount of heavy metal leaching than the raw bottom ash.

Fresh Properties of Self-Compacting Concrete Integrating Coal Bottom Ash as a Replacement of Fine Aggregates

2015 ◽  
Vol 1125 ◽  
pp. 370-376
Author(s):  
Ahmad Farhan Hamzah ◽  
Mohd Haziman Wan Ibrahim ◽  
Norwati Jamaluddin ◽  
Ramadhansyah Putra Jaya ◽  
Norul Ernida Zainal Abidin
Keyword(s):  
Bottom Ash ◽  
Resistance Index ◽  
Ash Content ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Segregation Index ◽  
Coal Bottom Ash ◽  
Slump Flow ◽  
Fine Aggregates ◽  
The Stability

The influence of coal bottom ash on fresh properties of self-compacting concrete (SCC) were presented in this paper. Self-compacting concrete mixtures were produced by 0.40 water/powder ratio and coal bottom ash as a replacement of fine aggregates in varying percentages of 0%, 10%, 15%, 20%, 25% and 30%. The fresh concretes were tested for the key workability belongings of self-compacting concrete such as passing and filling abilities and segregation resistance. The fresh properties were investigated by slump flow; T500 spread time, sieve segregation and L-box test. It was found that the slump flow decreased whereas the T500 spread time increased with higher coal bottom ash content. The L-box blocking ratios changed from 0.92 to 0.65 and were mostly showed satisfactory blocking ratio. The presence of coal bottom ash improved the stability of SCC mixture and the segregation index obtained from sieve test reduced with greater bottom ash content. It can be concluding that the filling and passing ability of SCC decreased when the amount of coal bottom ash content increased. In addition, the segregation resistance index decreased with higher coal bottom ash content.

scholarly journals Strength Properties of High-Strength Concrete Containing Coal Bottom Ash as a Replacement of Aggregates

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
In-Hwan Yang ◽  
Jihun Park ◽  
Nhien Dinh Le ◽  
Sanghwa Jung
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Bottom Ash ◽  
High Strength ◽  
Ultrasonic Pulse Velocity ◽  
Strength Properties ◽  
Pulse Velocity ◽  
Coal Bottom Ash ◽  
Strength Concrete ◽  
Fine Aggregates

Most previous studies on the strength properties of coal bottom ash (CBA) concrete have focused on concrete with a normal compressive strength, and thus, studies on the strength properties of high-strength concrete (HSC) containing CBA are limited. Therefore, the effects of replacing fine aggregates with CBA and variations in the curing age on the strength properties of HSC with a compressive strength of greater than 60 MPa were investigated in this study. The different CBA contents included 25, 50, 75, and 100%, and the different curing ages were 28 and 56 days. The mechanical properties of the HSC with CBA incorporated as fine aggregates were examined. The experimental results revealed that CBA could be partially or totally substituted for fine aggregates during HSC production. The test results also showed that the compressive, splitting tensile, and flexural strengths of the HSC containing CBA fine aggregates slightly decreased as the CBA content increased. Moreover, useful relationships between the compressive strength, splitting tensile strength, and flexural strength were suggested, and the predictions reasonably agreed with the measurements. Compared to those of the control specimen, the pulse velocities of the HSC specimens at various CBA contents decreased by less than 3%. In addition, equations for predicting the strength values of CBA concrete by using the ultrasonic pulse velocity were suggested.

Assesment of Heavy Metal Leaching and Ecological Toxicity of Reused Coal Bottom Ash for Construction Site Runoff Control

2018 ◽  
Vol 35 (6) ◽  
pp. 561-570 ◽  
Author(s):  
Jinho Kim ◽  
Jin Chul Joo ◽  
Eunbi Kang ◽  
Jongsoo Choi ◽  
Jeongmin Lee ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Bottom Ash ◽  
Metal Leaching ◽  
Construction Site ◽  
Coal Bottom Ash ◽  
Heavy Metal Leaching ◽  
Runoff Control

scholarly journals Coal Bottom Ash for Portland Cement Production

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Cristina Argiz ◽  
Miguel Ángel Sanjuán ◽  
Esperanza Menéndez
Keyword(s):  
Chemical Composition ◽  
Power Plant ◽  
Portland Cement ◽  
Electrical Power ◽  
Bottom Ash ◽  
Point Of View ◽  
Raw Material ◽  
Reaction Products ◽  
Cement Production ◽  
Coal Bottom Ash

Because of industrialization growth, the amount of coal power plant wastes has increased very rapidly. Particularly, the disposal of coal bottom ash (CBA) is becoming an increasing concern for many countries because of the increasing volume generated, the costs of operating landfill sites, and its potential hazardous effects. Therefore, new applications of coal bottom ash (CBA) have become an interesting alternative to disposal. For instance, it could be used as a Portland cement constituent leading to more sustainable cement production by lowering energy consumption and raw material extracted from quarries. Coal fly and bottom ashes are formed together in the same boiler; however, the size and shape of these ashes are very different, and hence their effect on the chemical composition as well as on the mineralogical phases must be studied. Coal bottom ash was ground. Later, both ashes were compared from a physical, mechanical, and chemical point of view to evaluate the potential use of coal bottom ash as a new Portland cement constituent. Both ashes, produced by the same electrical power plant, generally present similar chemical composition and compressive strength and contribute to the refill of mortar capillary pores with the reaction products leading to a redistribution of the pore size.

Use of coal bottom ash and other waste as fine aggregates in lightweight cement-based materials

2021 ◽  
pp. 53-87
Author(s):  
B. González-Fonteboa ◽  
F. Martínez-Abella ◽  
R. Rodríguez-Álvaro ◽  
E. Rey-Bouzón ◽  
S. Seara-Paz ◽  
...  
Keyword(s):  
Bottom Ash ◽  
Coal Bottom Ash ◽  
Fine Aggregates ◽  
Cement Based Materials
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