A study on the early-strength improvement of slag cements

Download
2009
Akgün, Erdinç
Use of alternative raw materials, especially industrial by-products, is necessary for a sustainable cement industry. By replacing clinker with industrial by-products, consumption of natural resources and energy is decreased. Therefore, both economical and environmentally friendly cements are produced. Several industrial by-products such as fly ash, silica fume, and slag, one of the most widely used industrial by-products, can be used to produce standard blended cements. Besides its many advantages, slag cements are reported to have lower early compressive strengths. Therefore, the objective of this study is to investigate the early-strength improvement of slag cements. In the experimental study, in order not to change the cement type, the additives were incorporated within the minor additional constituent ranges, i.e. less than 5%. First, CEM III/A type control cement was prepared by blending clinker (K) and slag (S), which were separately ground in a laboratory type ball mill. Ground limestone (L) of varying fineness, silica fume (F), and sodium hydroxide (N) were prepared to be used as minor additional constituent. The ground clinker, slag, and gypsum, and the additives at various ratios were blended to obtain 15 CEM III/A type slag cements other than the control. Finally, the fresh and the hardened properties of the cements were determined. As a result of this experimental study, it was observed that addition of limestone generally increased the early compressive strength of slag cements. However, silica fume and sodium hydroxide either decreased or did not affect the early compressive strength of the slag cements.

Suggestions

A study on blended bottom ash cements
Kaya, Ayşe İdil; Yaman, İsmail Özgür; Hoşten, Çetin; Department of Cement Engineering (2010)
Cement production which is one of the most energy intensive industries plays a significant role in emitting the greenhouse gases. Blended cement production by supplementary cementitious materials such as fly ash, ground granulated blast furnace slag and natural pozzolan is one of the smart approaches to decrease energy and ecology related concerns about the production. Fly ash has been used as a substance to produce blended cements for years, but bottom ash, its coarser counterpart, has not been utilized du...
Investigation of the properties of portland slag cement produced by separate grinding and intergrinding methods
Geven, Çağlar; Hoşten, Çetin; Department of Cement Engineering (2009)
In recent years, there has been a growing trend for the use of industrial by-products in the production of blended cements because of economical, environmental, ecological and diversified product quality reasons. Granulated blast furnace slag, a by-product of the transformation of iron ore into pig-iron in a blast furnace, is one of these materials which is used as a cementitious ingredient. The aim of this study is to investigate the properties of Portland slag cement (CEMII/B-S) by using separate grinding...
Properties of alinite cement produced by using soda sludge
Kesim, Asli Gunes; Tokyay, Mustafa; Yaman, İsmail Özgür; Öztürk, Abdullah (2013-04-01)
A production route of alinite cement clinker using the waste material of the Solvay process of the soda industry as the main raw material was searched. Soda sludge (73.5 wt%), clay (26.3 wt%) and minor amounts of iron ore (0.2 wt%) were mixed to obtain a raw mix that is later burned at nine different burning schemes. Four different burning temperatures (1050, 1100, 1150 and 1200 degrees C) and three different burning durations (60, 90 and 180 min) were applied for clinkerisation. The clinkers obtained were ...
Utilization of soda and beer wastes in cementitious systems
Aleessa Alam, Burhan; Yaman, İsmail Özgür; Department of Cement Engineering (2009)
To maintain the sustainability of cement and concrete production, there is a trend to use wastes in their production. Soda waste, generated by soda ash production process, and beer waste, generated by beer filtration process, are two locally produced wastes in Turkey and many other countries. The nature of these wastes, mostly their fineness, makes them possible to be used in concrete production, especially as a viscosity modifying agent in the self consolidating type of concrete. In this study, the additio...
Effects of separate and intergrinding on some properties of portland composite cements
Soyluoğlu, Serdar; Tokyay, Mustafa; Department of Cement Engineering (2009)
In the production of cement, to increase the cement/clinker ratio and decrease CO2 emission, the most important alternative is to produce mineral admixture incorporated cements (CEM II-III-IV-V) instead of portland cement (CEM I). These cements are usually produced by intergrinding the portland cement clinker and the mineral admixtures. However, the difference between grindabilities of the different components of such cements may cause significant effects on the particle size distribution and many other pro...
Citation Formats
E. Akgün, “A study on the early-strength improvement of slag cements,” M.S. - Master of Science, Middle East Technical University, 2009.