Effect of Magnesium Salt (MgCl2 and MgSO4) on the Microstructures and Properties of Ground Granulated Blast Furnace Slag (GGBFS)-Based Geopolymer

Zhang, Kun; Wang, Kaiqiang; Liu, Zhimao; Ye, Zhiwu; Zhang, Baifa; Deng, Lu; Liu, Yi; Li, Lijuan; Xiong, Zhe

doi:10.3390/ma15144911

Cited by 10 publications

(2 citation statements)

References 72 publications

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“…The use of alkali-activated binders is a promising approach, since they can be derived by activating industrial wastes of different origins. Among many possible sources, ground granulated blast-furnace slag (GGBFS) [1], discarded glasses unfit to be used in the production of new glass items [2], fly ash [3,4], and red mud [5] have been used to formulate alkali-activated binders. However, these materials suffer from extreme brittleness and low dimensional stability, as reported in the literature [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Mortars Reinforced with Arundo donax: Properties and Durability to Environmental Stresses

et al. 2023

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Natural fibers were used to modify alkali-activated fly-ash mortars. Arundo donax is a common, fast-growing, widespread plant with interesting mechanical properties. Short fibers of different lengths (from 5 to 15 mm) were added at a 3 wt% ratio to the binder amount to the alkali-activated fly-ash matrix. The possible effects on the fresh and cured properties of the mortars deriving from the different lengths of the reinforcing phase were investigated. The flexural strength of the mortars increased by up to 30% at the longest fiber dimensions, while the compressive strength remained almost unchanged in all of the compositions. The dimensional stability was increased slightly upon the addition of the fibers, depending on the fiber length, while the porosity of the mortars was reduced. Moreover, contrary to what was expected, the water permeability was not increased by the fibers’ addition, irrespective of their length. The durability of the obtained mortars was tested through freeze–thaw and thermo-hygrometric cycles. The results obtained so far underline a fair resistance to the changes in temperature and moisture and a better resistance to the freeze–thaw stresses of the reinforced mortars.

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Section: Introductionmentioning

confidence: 99%

Alkali-Activated Mortars Reinforced with Arundo donax: Properties and Durability to Environmental Stresses

et al. 2023

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“…Ground-granulated blast furnace slag (GGBFS) is a solid waste largely produced in the iron industry. Zhang et al [4] mixed it with alkaline solutions (NaOH or Na 2 SiO 4 solution) and magnesium salts (MgCl 2 •6H 2 O and MgSO 4 ) to prepare the GGBFS-based geopolymers. It is reported that the magnesium salt-free Na 2 SiO 4 -activatied geopolymer exhibited a much higher 28 d compressive strength (63.5 MPa) than the salt-free NaOH-activated geopolymer (31.4 MPa), with the former mainly containing an amorphous phase (C-(A)-S-H gel) and the latter containing numerous crystals.…”

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confidence: 99%