scholarly journals ALKALI SILICA REACTION OF BOF AND BFS WASTES COMBINATION IN CEMENT

2013 ◽  
Vol 19 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Ömer Özkan ◽  
Mehmet Sarıbıyık
Keyword(s):  
Experimental Study ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Basic Oxygen Furnace ◽  
The Other ◽  
Alkali Silica Reaction ◽  
Basic Oxygen ◽  
Bof Slag ◽  
Composite Cements ◽  
Furnace Slag

This study reports the results of an experimental study conducted to determine composite cements manufactured with the combination of Basic Oxygen Furnace (BOF) Slag and Blast Furnace Slag (BFS). The overall objective of this work is to determine whether a combination of BOF slag and BFS can be used as a cementations material to produce Composite Portland Cement (CPC). Three groups of cement are produced for testing. The first group contains BOF slag, the second group contains BFS and the last group contains the mixture of BOF slag and BFS together. Physical properties and Alkali Silica Reaction (ASR) of these groups are also evaluated in this study. Maximum ASR expansion is observed from the sample of CPC created with BOF slag. On the other hand minimum ASR expansion value is located in the sample of CPC created with BFS only.

The Role of Alkalis in Hydraulic Mixtures

2019 ◽  
Vol 955 ◽  
pp. 62-67
Author(s):  
Lukáš Procházka ◽  
Jana Boháčová
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Alkali Silica Reaction ◽  
Type Ii ◽  
Hydration Products ◽  
Experimental Part ◽  
Ph Values ◽  
Furnace Slag

Alkali substances are present in cements used as a binder in concrete only in a minimum content. The most known process that alkali causes is the alkali-silica reaction. In this reaction, the alkali contained in the cement or supplied from the outside with an inappropriately selected aggregate containing amorphous SiO2. This reaction results in the development of hydration products, resulting in an increase in the volume of the original components, which can cause a breakage of the concrete structure and subsequent disintegration. The range of alkali-silica reaction can be reduced by the use of a suitable aggregate or the use of Type II admixtures which are characterized by pozzolanic or latently hydraulic activity. These admixtures react with alkali and then no longer react with the amorphous SiO2 contained in the aggregate. Alkalis also affect other properties of concrete such as basic physical-mechanical properties, frost resistance and pH.In the experimental part the pH values were compared between mixtures of Portland cement and alkaline activated blast furnace slag using slag aggregate from the heap Koněv.

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