A preliminary study of autoclaved alkali-activated slag blended with quartz powder

Rashad, Alaa M.; Zeedan, Sayieda R.; Hassan, Hassan A.

doi:10.1016/j.conbuildmat.2011.12.104

Cited by 47 publications

(13 citation statements)

References 45 publications

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“…Figure 9 presents the result of Thermogravimetric analysis (TGA) and Derivative thermogravimetric (DTG) of mortar with different Na 2 O concentration of 4%, 6%, 8%, and 10%. For four samples, the main DTG peak centered at approximately 90 °C is result of dehydration of calcium silicate hydrate (C-S-H) [ 44 ]. It is noted from Figure 9 b that the DTG peak of C-S-H is larger and sharper when increasing the Na 2 O concentration in mortar.…”

Section: Resultsmentioning

confidence: 99%

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Tran

Kwon

2018

Materials

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The mechanical strength variation of ambient cured Alkali-activated mortar (AAS) upon exposure to elevated temperatures from 200 to 1200 °C was studied in this article. Slag was activated by the combination of sodium silicate liquid (Na2SiO3) and sodium hydroxide (NaOH) with different Na2O concentrations of 4%, 6%, 8%, and 10% by slag weight. Mechanical properties comprising compressive strength, flexural strength, and tensile strength before and after exposure were measured. Thermogravimetric analysis (Thermogravimetric analysis (TGA) and Derivative thermogravimetric (DTG)), X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDS) were also used for strength alteration explanation. The results indicated that Na2O concentration influence on strength variation of AAS mortar was observed clearly at temperature range from ambient temperature to 200 °C. The melting alteration of AAS mortar after exposed to 1200 °C was highly dependent on concentrations of Na2O.

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Section: Resultsmentioning

confidence: 99%

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Tran

Kwon

2018

Materials

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“…In modern geopolymer, the AAS geopolymer denotes the alkali activation of aluminosilicate precursors such as the calciumcontaining sources (e.g., alkali-activated GGBS binder), the lowimpurity aluminosilicates (e.g., alkali-activated FA/MK binder), or their blends (e.g., alkali-activated GGBS/FA blends), while the SAP geopolymer implies that the aluminosilicate sources are pre-mixed with some metals and activated by the acid phosphate or other phosphates. It is good to mention that the activation methods assisted by external energies [e.g., microwave (Chindaprasirt et al, 2013a), autoclaved (Rashad et al, 2012), and mechanical activation (Kumar and Kumar, 2011)] are not involved in this review.…”

Section: Terminology and Classificationmentioning

confidence: 99%

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

2019

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Chemically activated materials (often termed as geopolymer) have received attracting attentions in civil, material and environmental research fields as a toolkit alternative to traditional Portland cement in specific applications. This paper presents a comparative review on silico-aluminophosphate (SAP) geopolymers in terms of definition, chemistries involved during geopolymerization, mechanical performance, durability, environmental impacts, and their potentials in applications relative to conventional alkali-aluminosilicate (AAS) geopolymers. Recommendations for future applications are also highlighted. It is found that S-A-P gels with six-coordinated aluminum environment dominate in SAP geopolymers, while the aluminum in N-A-S-H gels formed in the AAS geopolymers is characterized by four-coordinated features. Besides, the slow performance development of SAP geopolymer matrix under ambient temperature curing can be compensated through incorporating additional countermeasures (e.g., metal sources) which allow the tailored design of such geopolymers for certain in-situ applications. Generally, the calcium-bearing C-(A)-S-H gels co-existing with N-A-S-H gels are dominant in AAS geopolymers, while the S-A-P gels enhanced by phosphate-containing crystalline/amorphous phases are the main products in SAP geopolymers. The SAP geopolymers show their environmental friendliness relative to the AAS geopolymers due to the utilization of phosphate activators that require lower production energy relative to silicate-containing activators. However, the higher cost of phosphate activators may confine the applications of SAP geopolymers in some exquisite or special fields.

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“…With regards to the QS component of HMW, Rashad et al [51] found that a 30% addition of fine QS (80-85% < 32 lm particles)…”

Section: Hydrated Mortar and Its Individual Components As Additives Imentioning

confidence: 98%

“…-provide a comparative analysis based on new and previously published results [51][52][53] of the individual and combined effects of the constituents of GHM on the properties of fresh and hardened AASC pastes, taking into consideration the dispersity, quantity and composition of each additives, -define the role of each individual GHM component in relation to the final properties of AASC pastes.…”

Section: Hydrated Mortar and Its Individual Components As Additives Imentioning

confidence: 99%

Individual and combined effects of Portland cement-based hydrated mortar components on alkali-activated slag cement

Rakhimova

Рахимов

2014

Construction and Building Materials

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A preliminary study of autoclaved alkali-activated slag blended with quartz powder

Cited by 47 publications

References 45 publications

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

Individual and combined effects of Portland cement-based hydrated mortar components on alkali-activated slag cement

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