Effect of free lime content on properties of cement–fly ash mixtures

2013 ◽  
Vol 38 ◽  
pp. 829-836 ◽  
Author(s):  
Krittiya Kaewmanee ◽  
Pitisan Krammart ◽  
Taweechai Sumranwanich ◽  
Pongsak Choktaweekarn ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Fly Ash ◽  
Free Lime ◽  
Lime Content

Effect and limitation of free lime content in cement-fly ash mixtures

2016 ◽  
Vol 102 ◽  
pp. 515-530 ◽  
Author(s):  
Adnan Nawaz ◽  
Parnthep Julnipitawong ◽  
Pitisan Krammart ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Fly Ash ◽  
Free Lime ◽  
Lime Content

Technical Note on the Determination of Free Lime (CaO) in Fly Ash

1984 ◽  
Vol 43 ◽  
Author(s):  
Scott Schlorholtz ◽  
Turgut Demirel
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Recent Work ◽  
Technical Note ◽  
Fly Ashes ◽  
Major Drawback ◽  
Free Lime ◽  
Chemical Test ◽  
Lime Content

AbstractMany fly ashes contain free lime (CaO) and periclase (MgO) [1,2]. These two compounds, when present in excessive amounts, are known to cause soundness problems in portland cement [3,4]. Recent work [5] has indicated that the autoclave expansion of portland cement-fly ash pastes is related to the concentration of CaO and MgO in a given paste, free lime typically being more detrimental than periclase. The purpose of this technical note is to briefly discuss two methods that are currently available for determining the free lime content of fly ash, and to suggest a supplement to the autoclave test (described in ASTM C 151). The major drawback of the autoclave test is that it requires approximately two days to complete and therefore it would be helpful to have a quick chemical test that could be used to indicate the soundness properties of a given fly ash.

Utilization of Blast Furnace Slag, Steel Slag in the Production of Clinker

2013 ◽  
Vol 743-744 ◽  
pp. 334-338
Author(s):  
Shou Wan Qin ◽  
Jian Jun Shen ◽  
Hui Fen Wang ◽  
Zhao Ran Xiao
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Raw Materials ◽  
Steel Slag ◽  
Cement Clinker ◽  
Petrographic Analysis ◽  
Free Lime ◽  
Lime Content ◽  
Furnace Slag

The study on the use of blast furnace slag, steel slag and fly ash as raw materials to produce cement clinker has been carried out in the present investigation. The burnability of raw meal was determined by the linear shrinkage and free lime content of clinkers sintered at different temperatures. The microstructrue and properties of raw meal and clinker were investigated by the means of chemical analysis, X-ray diffraction and petrographic analysis. The physical and mechanical performance of cement was tested according to the standards. The results showed that the burnability was good as the free lime content was lower than 0.5w% in the clinker sintered at 1350. It is believed that the nucleation of alite only needs to grow bigger and rearrange with the rising temperature. The micrograph of clinker sintered at 1450 showed that there were some garlands of belite crystals around alite crystals because of high temperature or the local reducing atmosphere caused by the compact raw meal. High-quality cement clinker with compressive strength of 60.4MPa was produced by utilizing limestone, blast furnace slag, steel slag and fly ash as raw materials after curing 28 days.

Characterization of Coal Fly Ash, Bottom Ash and their Possibilities as Catalysts for Biodiesel Production

2021 ◽  
Vol 904 ◽  
pp. 413-418
Author(s):  
Wilasinee Kingkam ◽  
Sasikarn Nuchdang ◽  
Dussadee Rattanaphra
Keyword(s):  
Fly Ash ◽  
Palm Oil ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Bottom Ash ◽  
Biodiesel Production ◽  
Catalyst Loading ◽  
Free Lime ◽  
Operation Conditions ◽  
Class C

Coal fly ash (CFA) and bottom ash (BA) obtained from coal fired power plants in Thailand and local supplier were characterized using XRF, XRD and N2 adsorption-desorption techniques. Their possibilities for conversion of palm oil into biodiesel were investigated. Selected CFA was also modified with lanthanum (La) at different La loading and the influence of La loading on biodiesel conversion was evaluated. The resulted showed that the Class C CFA as contained large amount of CaO (free lime) could catalyze the transesterification to achieve the highest FAME content of 89% under the operation conditions; the reaction temperature of 200 °C, the reaction pressure of 39 bars, the catalyst loading of 5 wt% of oil, the molar of oil to methanol of 1:30 and the stirring speed of 600 rpm for 5 h. The addition of La on the Class C CFA had a negative effect on conversion of palm oil. The FAME content decreased gradually from 89 to 62% with increasing La loading from 0 to 1 wt%.

Optimum lime content of fly ash with salt

2003 ◽  
Vol 7 (4) ◽  
pp. 187-191 ◽  
Author(s):  
B. S. Narendra ◽  
P. V. Sivapullaiah ◽  
H. N. Ramesh
Keyword(s):  
Fly Ash ◽  
Lime Content

scholarly journals OPTIMIZATION OF THE USE OF FLY ASH AS AN ADDITIVE PORTLAND COMPOSITE CEMENT (PCC)

2019 ◽  
Vol 4 (2) ◽  
pp. 61-72 ◽  
Author(s):  
Leni Rumiyanti ◽  
Listiani Listiani ◽  
Tika Damayanti
Keyword(s):  
Fly Ash ◽  
Setting Time ◽  
Quality Analysis ◽  
Insoluble Residue ◽  
Optimum Conditions ◽  
Free Lime ◽  
Composite Cement ◽  
Ideal Composition ◽  
Physical And Chemical ◽  
The Ideal

Research has been carried out on the optimization of the use of Lahat Fly Ash as an Additive Portland Composite Cement (PCC) which aims to determine the optimum conditions for adding Lahat fly ash to produce cement with physical and chemical requirements in accordance with SNI 7064:2014 and discover the ideal composition of cement with fly additions Lahat ash from various cement compositions. The quality analysis in making PCC cement is chemically in the form of Insoluble Residue (IR), Loss of Ignition (LOI), and free lime (FCaO) as well as the quality of physics in the form of Blaine, setting time, and cement mortar compressive strength. The results obtained after the process of making PCC cement with the addition of 14% Lahat fly ash, namely PCC cement in optimum conditions with physical and chemical requirements in accordance with SNI 7064: 2014 where the ideal composition of PCC cement manufacture is 14% Lahat fly ash, clinker 62%, 3% gypsum, 18% limestone, and 3% pozzolans in making PCC cement. Therefore, Lahat fly ash can be used as an alternative mixture in making PCC cement.

Fly ash from Coal-Combustion Waste as an Additive for Quality Improvement and Compressive Strength of Cement

2021 ◽  
Vol 27 (1) ◽  
pp. 127-134
Author(s):  
Roni Adi Wijaya ◽  
Yayuk Astuti ◽  
Septi Wijayanti
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Coal Combustion ◽  
National Standard ◽  
Insoluble Residue ◽  
Chemical Components ◽  
Free Lime ◽  
Mineral Additive ◽  
Additional Mineral

A series of tests were carried out to determine the effect of the addition of coal combustion fly ash as an additional mineral (additive) on improving the quality and compressive strength of cement according to the Indonesian National Standard (SNI 15-2049-2004). Research methods include sample preparation, manufacture of cement with 0%, 5%, 8%, 12%, and 15% fly ash variations, chemical and physical properties of cement. The parameters measured were the level of chemical composition (%) using X-Ray Fluorescence Spectroscopy (XRF) ARL 9800 OASIS, free lime content (%) by volumetry, insoluble residue level (%) by gravimetry, compressive strength (kg/cm2), and smoothness cement (cm2/g). The results showed that the addition of fly ash increased the SiO2 content of cement, thereby increasing C3S and C2S compounds which are compressive strength components of a cement. Besides, the addition of fly ash is directly proportional to IR levels, compressive strength, smoothness, and inversely proportional to free lime levels. So the addition of fly ash can improve the quality of cement by increasing chemical components, increasing compressive strength, and reducing cracking or expansion of cement.

High Free Lime Fly ASH;Character Ization and Use

1991 ◽  
pp. 233-242 ◽  
Author(s):  
V. Rogić ◽  
B. Matković ◽  
M. Paljević ◽  
D. Dimić ◽  
D. Dasović ◽  
...  
Keyword(s):  
Fly Ash ◽  
Free Lime
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