Mustafa Adel Saeed
Civil Engineering Department, Mustansiriyah University, Baghdad, Iraq/ Master student.
Ali Sabah Al Amli
Civil Engineering Department, Mustansiriyah University, Baghdad, Iraq/ PHD.
Abstract
Because of the massive CO2 emissions associated with cement manufacture, it is the primary cause of global warming. As a result, the writers and research organizations are motivated in multiple ways to find long-term solutions to this problem. The primary binder in geopolymer concrete is created by alkali activation some source materials such as fly ash, metakaoline, rice husk ash, and pulverized granulated blast furnace slag. Geopolymer concrete frequently has mechanical strength characteristics that are comparable to conventional concrete. The properties of the utilized source materials and the molar concentrations of the alkali activator, however, limit the application of this form of concrete. In this method, the relevant structural behavior can be studied. In addition, it is common that the transverse web openings may cause a relevant lack in structural behavior due to the inherent reduction of concrete within the existing section. The current study tries to investigate the flexural behavior of flay ash based geopolymer concrete by implementing an experimental program. Such program included casting and testing five fly ash geopolymer concrete T beams till failure. All the tested beams within this experimental program are of center to center span of 1600 mm and 1750 mm total length. The section dimensions are of total height of 250mm and flange width of 200mm while the while the web width is 100mm. The results showed that a lack of structural behavior can result from the presence of a transverse web opening in the center of geopolymer RC beams. The first cracking load, yielding load, and maximum load carrying capacity are all reduced when transverse web openings are present. In addition, the general performance of geopolymer T beams that have circular transverse web openings perform better than those that have square transverse web opening.
Keywords:
: Geopolymer, fly ash, metakaoline, slag, reinforced concrete beams and Structural Behavior
References
1) The presence of transverse web opening at the center of geopolymer RC beams can cause a consequent lack in structural behavior.
2) The load deflection response of geopolymer T beams is similar to conventional RC beams.
3) The presence of transverse web openings reduce the first cracking load, yielding load and maximum load carrying capacity.
4) The general performance of geopolymer T beams that have circular transverse web openings perform better than those that have square transverse web opening.
5) Further research is needed to include the rectangular transverse web openings.
6) Future research should be devoted to investigate the effect of the presence of transvers web openings at the effective shear zone.
7) the effect of the presence of transvers web openings at the effective shear zone.
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