Effect of pulverized fuel ash, ground granulated blast-furnace slag and CO2 curing on performance of magnesium oxysulfate cement

2020 ◽  
Vol 230 ◽  
pp. 116990 ◽  
Author(s):  
Qiyan Li ◽  
Linchun Zhang ◽  
Xiaojian Gao ◽  
Junyi Zhang
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Granulated Blast Furnace Slag ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Magnesium Oxysulfate ◽  
Pulverized Fuel Ash ◽  
Furnace Slag

scholarly journals Effects of ground granulated blast furnace slag and pulverized fuel ash on rheology of concrete

2020 ◽  
Vol 39 (1) ◽  
pp. 97-104
Author(s):  
A.S. Bature ◽  
M. Khorami ◽  
A. Lawan
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Yield Stress ◽  
Blast Furnace Slag ◽  
Granulated Blast Furnace Slag ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Dynamic Yield ◽  
Pulverized Fuel Ash ◽  
Furnace Slag

The rheology of concrete containing Pulverized Fuel Ash (PFA) and Ground Granulated Blast Furnace Slag (GGBS) has been scarcely studied and reported, despite their increase application as Supplementary Cementitious Materials (SCM) that drives improvement of sustainability of the construction industry. This work studied the effect of these SCMs and Superplasticizer proportions on rheological properties of concrete using rate controlled concrete rheometer. Two groups of mixes containing replacement or addition on mass basis using either PFA or GGBS or their combinations were derived from the control mix. The dynamic yield stress, plastic viscosity and 28 day compressive strength of the control mix are 1258 Pa, 6 PaS, and 40.5 MPa respectively. The results of the rheology tests of the various binary mixes (PFA and Portland cement) and ternary mixes (Portland cement, PFA and GGBS) structural concrete shows wide disparity in the measured rheological parameters. The results show that the decrease in dynamic yield stress of the ternary mix containing 20% GGBS is 4.1%, whereas the decrease in dynamic stress of the ternary mix containing 20% PFA is 35.9% compared to the control ternary mix. The high volume Portland cement replaced ternary concrete can therefore be effectively characterized as a workable and pumpable concrete. Keywords: Rheology, PFA, GGBS, superplasticizer, concrete.

Cements in radioactive waste disposal: some mineralogical considerations

1985 ◽  
Vol 49 (351) ◽  
pp. 211-221 ◽  
Author(s):  
C. E. McCulloch ◽  
M. J. Angus ◽  
R. W. Crawford ◽  
A. A. Rahman ◽  
F. P. Glasser
Keyword(s):  
Blast Furnace ◽  
Radioactive Waste ◽  
Blast Furnace Slag ◽  
Radioactive Waste Disposal ◽  
Composite Matrix ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash ◽  
Furnace Slag

AbstractCementitious matrices are being assessed for immobilization of radioactive wastes. This paper discusses some mineralogical aspects of cement chemistry and the uses of siliceous minerals as selective sorbants to enhance immobilization potential.Studies of sorption and leaching of caesium from pulverized fuel ash (PFA), blast furnace slag, tobermorite, xonotlite, and clinoptilolite are reported. The role of incorporation of these additives in cement and the effect on the nature of the composite matrix on caesium behaviour has been investigated. Specific mechanisms of the interaction of additives with highly alkaline cement environment are described. While slags, PFA, and clinoptilolite undergo reaction at different rates, tobermorite and xonotlite appear to be stable in cement.

scholarly journals DURABILITY PROPERTIES OF TERNARY BLENDED FLOWABLE HIGH PERFORMANCE CONCRETE CONTAINING GROUND GRANULATED BLAST FURNACE SLAG AND PULVERIZED FUEL ASH

2019 ◽  
Vol 81 (4) ◽  
Author(s):  
Cheah Chee Ban ◽  
Chow Wee Kang
Keyword(s):  
Blast Furnace Slag ◽  
High Performance ◽  
High Performance Concrete ◽  
Durability Properties ◽  
Granulated Blast Furnace Slag ◽  
Concrete Production ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash ◽  
Furnace Slag

The use of ordinary Portland cement as the primary binder in concrete production resulted in the high carbon footprint of the concrete material which cause a great deal of environmental impacts over the years. The consumption of OPC is especially significant for high strength concrete, which require a very high cement content (more than 450 kg/m3). Hence, supplementary cementitious materials such as ground granulated blast furnace slag (GGBS) and pulverized fuel ash (PFA) were chosen as partial replacement materials of OPC for concrete production in the research due to their ease of availability from the steelmaking manufacturing sectors and coal-fired electricity power stations in the country. As the sustainability of concrete is also our main concern, the durability performance of flowable high performance concrete containing high volume of GGBS and PFA (50-80% replacement of OPC) has been studied in this research. Therefore, the durability properties of flowable high performance concrete had been assessed in term of air permeability, porosity, water absorption and capillary action. From the results of assessment, all ternary blended concrete mixes exhibited better durability performances than control OPC concrete at later ages due to formation of denser microstructure by pozzolanic reaction of GGBS and PFA. It is concluded that the mix proportion of flowable high performance concrete production with 60% replacement of OPC by GGBS and PFA has the optimum durability performances than OPC concrete.

Time Depndence of pH in a Cementitious Repository

1988 ◽  
Vol 127 ◽  
Author(s):  
Alan Atkinson ◽  
Nicoia M. Everitt ◽  
Richard M. Guppy
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Soluble Ions ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Waste Repository ◽  
Pulverized Fuel Ash ◽  
Furnace Slag ◽  
Cement Compounds

ABSTRACTThe pH of a cementitious radioactive waste repository is expected to decrease with time as water leaches out soluble ions or as a result of reactions between repository constituents. These processes have been simulated in the laboratory and the results compared with behaviour anticipated from the known chemistry of cement compounds.The studies indicate that the pH in Portland cements and Blast Furnace Slag cements (BFS) is likely to remain above 10.5 for very long periods of time, of the order of several hundred thousand years for a typical repository. They also show that extensive use of Pulverized Fuel Ash (PFA) leads to uncertainty in long term pH which could be as low as 9 to 10 in some cases.

scholarly journals Performance of Ternary Class F Pulverised Fuel Ash and Ground Granulated Blast Furnace Slag Concrete in Sulfate Solutions

2017 ◽  
Vol 2 (7) ◽  
pp. 8 ◽  
Author(s):  
Ash Ahmed ◽  
John Kamau
Keyword(s):  
Blast Furnace ◽  
Sodium Sulfate ◽  
Blast Furnace Slag ◽  
Strength Deterioration ◽  
Granulated Blast Furnace Slag ◽  
Sulfate Solutions ◽  
Fuel Ash ◽  
The Individual ◽  
Furnace Slag ◽  
Intended Use

Durability of concrete is defined as its ability to resist deterioration after it has been exposed to the environment of its intended use. This work examined the performance of combined (ternary) Pulverised Fuel Ash (PFA) and Ground Granulated Blast Furnace Slag (GGBS) concrete in sulfate solutions of sodium sulfate (Na2SO4), magnesium sulfate (MgSO4) and mixed Na2SO4 and MgSO4, as well as its performance in water absorption. Investigations were carried out on replacements that were found to have achieved the highest compressive strengths as well as on 30% replacements from a previous study. From the results obtained, it was also found that at highest compressive strengths, the ternary concrete could be used with an advantage over the individual binary concretes in MgSO4 environments, whereas at a higher replacement, the ternary concrete could be used with an advantage over individual binary specimens in Na2SO4 and MgSO4 environments. For visual observations, it was concluded that the ternary concrete could be used with an advantage over the individual binary concretes in Na2SO4 and MgSO4 environments, whereas for strength deterioration, the results showed that the ternary specimens could be used with an advantage over individual binary concretes in both the MgSO4 and the mixed sulfate solutions. Generally, the ternary specimens showed some complimentary effect from the two materials.

scholarly journals Kajian Kuat Mekanis Alkali-Activated Mortar (AAM)

Kilat ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 101-107
Author(s):  
Muhammad Sofyan
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Bottom Ash ◽  
Palm Oil Fuel Ash ◽  
Granulated Blast Furnace Slag ◽  
Fuel Ash ◽  
Oil Fuel ◽  
Furnace Slag ◽  
Alkali Activated

Mortar salah satu material yang memiliki manfaat yang beraneka ragam dalam konstruksi bangunan.  Sejauh ini, mortar konvensional digunakan sebagai bahan plester atau coating pada bangunan. Bahan pengikat utama mortar pada dasarnya masih mengandalkan semen. Pemanfaatan Batu bara pada pembangkit listrik tenaga uap masih menjadi salah satu arus utama sebagai pendukung kebutuhan energi listrik. Penumpukan hasil sisa pembakaran batu bara seperti fly ash dan bottom ash berpotensi mengganggu stabilitas Ekosistem lingkungan. Alkali-Activated mortar dengan mengandalkan larutan alkali activator yang direaksikan dengan material pozzolanic seperti fly ash, Ground Granulated Blast Furnace Slag (GGBFS), Palm Oil Fuel Ash (POFA)ldan lain-lain dapat menjadi salah satu solusi dalam mengurangi limbah fly-ash yang menumpuk. Dalam beberapa riset riset terdahulu idealnya kontrol mutu dari Alkali Activated mortar dapat ditinjiau pada kekuatan mekanisnya seperti kuat tekan dan lentur Dalam artikel ini akan ditinjau bagaimana kekuatan mekanis pada beberapa jenis Alkali-Activated Mortar. Dari studi-studi yang akan dibahas tersebut akan ditarik sebuah kesimpulan berdasarkan data-data pengujian mekanis yan pada akhirnya dapat memberi rekomendasi tentang bagaimana performa mekanis pada Alkali-Activated mortar.

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