Utilizing residues of CFB co-combustion of coal, sludge and TDF as an alkali activator in eco-binder

Wu, Yann-Hwang; Huang, Ran; Tsai, Chia-Jung; Lin, Wei‐Ting

doi:10.1016/j.conbuildmat.2015.01.062

Cited by 20 publications

(10 citation statements)

References 13 publications

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“…Results of compressive strength development were indicated that S and FA reacted with water and then with calcium hydroxide via a pozzolanic reaction to form hydration products (i.e., calcium silicate hydrate (C-S-H) and/or calcium aluminium silicate hydrate (C-A-S-H) colloids). These findings are consistent with those reported in previous studies [18,24] and it was produced produces viscous hardening behavior in the cementless composites [23].…”

Section: Flowabilitysupporting

confidence: 93%

“…In the second phase, the Ca(OH)2 and SiO2 in the S and FA with reacted with SiO2 and Al2O3 to produce C-S-H and C-A-S-H gel [35] as shown in Figure 10. It can be consistent with previous study [18]. Based on the SEM images, the reaction mechanisms in non-cement blended materials comprising a mix of S and FA can be divided into two phases.…”

Section: Sem Observationsupporting

confidence: 91%

Section: Drying Shrinkagementioning

confidence: 95%

“…By contrast, the shrinkage development curve of specimen S60 was 4 times higher than that of cement mortar, indicating a high SO3 content following a rapid hydration reaction with a corresponding rapid volume expansion. Previous studies [17,18,24] have also reported on the considerable influence of SO3 on the strength of mortar specimens containing FA. Our results revealed that the addition of fibers to specimen S60 (S60-F1/2/5) did not have a significant effect on shrinkage and the effect of fibers in shrinkage development curves of S40 and S50 specimens were similar to those of S60 specimens.…”

Section: Drying Shrinkagementioning

confidence: 95%

“…Ground-granulated blast-furnace slag can be combined with various supplementary cementitious materials to eliminate the need for alkali activators in the production of materials suitable for civil construction. Many such materials provide high compressive strength (30 MPa to 60 MPa), as well as excellent mechanical properties and durability [15][16][17][18]. The inclusion of polypropylene fibers in composites has been shown to enhance the tensile strength and volume stability of non-cement blended materials [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Composite Properties of Non-Cement Blended Fiber Composites without Alkali Activator

Lin

Korniejenko

et al. 2020

Materials

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The vigorous promotion of reuse and recycling activities in Taiwan has solved a number of problems associated with the treatment of industrial waste. Considerable advances have been made in the conversion of waste materials into usable resources, thereby reducing the space required for waste storage and helping to conserve natural resources. This study examined the use of non-alkali activators to create bonded materials. Our aims were to evaluate the feasibility of using ground-granulated blast-furnace slag (S) and circulating fluidized bed co-fired fly ash (F) as non-cement binding materials and determine the optimal mix proportions (including embedded fibers) with the aim of achieving high dimensional stability and good mechanical properties. Under a fixed water/binder ratio of 0.55, we combined S and F to replace 100% of the cement at S:F ratios of 4:6, 5:5, 6:4. Polypropylene fibers (L/d = 375) were also included in the mix at 0.1%, 0.2% and 0.5% of the volume of all bonded materials. Samples were characterized in terms of flowability, compressive strength, tensile strength, water absorption, shrinkage, x-ray diffraction (XRD) and scanning electron microscope (SEM) analysis. Specimens made with an S:F ratio of 6:4 achieved compressive strength of roughly 30 MPa (at 28 days), which is the 80% the strength of conventional cement-based materials (control specimens). The inclusion of 0.2% fibers in the mix further increased compressive strength to 35 MPa and enhanced composite properties.

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Section: Flowabilitysupporting

confidence: 93%

Section: Sem Observationsupporting

confidence: 91%