A novel method to produce dry geopolymer cement powder

Abdel‐Gawwad, Hamdy A.; Abo-El-Enein, S.A.

doi:10.1016/j.hbrcj.2014.06.008

Cited by 132 publications

(59 citation statements)

References 30 publications

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“…The majority of widely recognized antacid fluid utilized in geopolymerization is a blend of NaOH/KOH and Na 2 SiO 3 . At the point when any of the above source materials for instance fly ash (FA) in strong frame are blended by means of antacid arrangements of suitable fixation and Na 2 SiO 3 , geopolymers are shaped amid the polymerization response of fly ash [30]. Dissimilar molarities of NaOH solution (Figure 3a), fly ash percentage (Figure 3b) and GGBFS percentages (Figure 3c) for different geopolymer concrete mixes are shown in Figure 3.…”

Section: Geopolymer Binders Synthesized By Fly Ash and Ground Granulamentioning

confidence: 99%

Mix Design and Mechanical Properties of Fly Ash and GGBFS-Synthesized Alkali-Activated Concrete (AAC)

et al. 2019

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Cement is one of the construction materials widely used around the world in order to develop infrastructure and it is also one of the factors affecting economies. The production of cement consumes a lot of raw materials like limestone, which releases CO 2 into the atmosphere and thus leads to global warming. Many investigations are underway in this area, essentially focusing on the eco-accommodating environment. In the research, an alternative material to cement binder is geopolymer binder, with the same efficiency. This paper presents scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis of factory byproducts (i.e., fly ash and ground granulated blast furnace slag (GGBFS)). The mix design process for the manufacture of alkali-activated geopolymer binders synthesized by fly ash and GGBFS is presented. The mechanical properties (compression, split tensile and flexural strength, bond strength) of geopolymer concrete at different mix proportions and at dissimilar curing conditions were also investigated. Geopolymer concrete synthesized with 30% fly ash and 70% GGBFS has better properties at 14 M of NaOH and cured in an oven for 24 h at 70 • C.Infrastructures 2019, 4, 20 2 of 11 affecting the mechanical and durable properties of geopolymer concrete. These are: fineness of fly ash and GGBFS, molarities of NaOH solution, and curing conditions (sunlight and oven) [5,6]. With an increase of molarities of NaOH solution, the mechanical properties are also increased. Generally up to 14 M NaOH solution is economic and it is suggested can improve the durability of geopolymer concrete [7]. Table 1 indicates the density, surface area and distribution of particle sizes of different materials like ordinary Portland cement (OPC), flyash, silica fume and GGBFS.

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Section: Geopolymer Binders Synthesized By Fly Ash and Ground Granulamentioning

confidence: 99%

Mix Design and Mechanical Properties of Fly Ash and GGBFS-Synthesized Alkali-Activated Concrete (AAC)

et al. 2019

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“…Meanwhile, the mix proportions of FAG-D mortar specimens was determined according to Abdel-Gawwad and Abo-El-Enein mix [13]. The total ratio of NaOH, limestone, and fly ash was maintained to 1.0, similar to that binder ratio of PC control specimen.…”

Section: Proportionsmentioning

confidence: 99%

“…The dry geopolymer material was developed by wet mixing method in accordance with the method proposed by Abdel-Gawwad and Abo-El-Enein [13], which was made by blended 10 Molar NaOH solution with limestone. The wet powder was dried in the oven at 100 O C for 24 hours.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…Further, the use of water in geopolymer, known as water to solid ratio, requires a strict supervision due to its liquid characteristics of geopolymer specimen which will affect the ability to achieve its structural integrity [12]. Previous research [13] has found that the use of dry geopolymer powder becomes the an alternative to overcome such problems. According to Abdel-Gawwad and Abo-El-Enein [13], dry geopolymer powder can be prepared by mixing NaOH solution and high calcium material, such as limestone or calcium carbonate (CaCO3).…”

Section: Introductionmentioning

confidence: 99%

“…Previous research [13] has found that the use of dry geopolymer powder becomes the an alternative to overcome such problems. According to Abdel-Gawwad and Abo-El-Enein [13], dry geopolymer powder can be prepared by mixing NaOH solution and high calcium material, such as limestone or calcium carbonate (CaCO3). The dry powder is then mixed with Ground Granulated Blast-furnace Slag (GGBS) and water to produce geopolymer paste.…”

Section: Introductionmentioning

confidence: 99%

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The effect of water binder ratio on strength development of class C fly ash geopolymer mortar prepared by dry geopolymer powder

Wardhono

2019

MATEC Web Conf.

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The use of geopolymer binder as cement replacement material can reduce the amount of carbon dioxide gas produced during the Portland Cement manufacturing process. However, the main issue of geopolymer binder is in the mixing process of sodium silicate and NaOH which requires specialized knowledge and strict supervision. This paper reports the effect of water binder ratio on strength development of fly ash geopolymer mortar using dry geopolymer powder. Fly ash with high calcium content was used as primary material. The dry geopolymer powder was prepared by wet mixing method which was made by drying a mixture of NaOH solution and limestone for 24 hours. The variations of water to binder ratio were 0.30, 0.35, 0.40, 0.45, and 0.50. Strength properties were measured by compressive strength at the age of 7, 14 and 28 days. The results showed that the water binder ratio significantly affect the strength development of geopolymer mortar prepared by dry geopolymer powder. The water binder ratio of 0.40 gives the highest compressive strength of 10.3 MPa at 28 days. This suggests that the use of dry geopolymer powder on geopolymer mortar production can overcome the difficulties of geopolymer mortar mixing on site.

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