Tensile behavior and microstructure of hybrid fiber ambient cured one-part engineered geopolymer composites

Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structures

“…Regarding the effect of the steel/PE fibre ratio at a fixed volume fraction, it can be observed from PE fibres) would generally drop the flowability of the HFRG composites. This finding was also observed in [15] and [16] whereby the higher the steel fibre volume used in a fixed (steel + PE) combination, the higher the workability found. Meanwhile, Gao et al [17] characterized the slump flows of samples with 1% fibre volume content at different long/short fibre ratios (i.e., 80/20, 60/40, 40/60 and 20/80) and reported that higher long/short fibre ratio exhibited a relatively low slump.…”

“…Combining different materials (i.e., steel + PE), however, does not necessarily result in the same trend since an optimum flow value can be obtained at a combined fibre volume content of 1.5%. Increasing the amount of PE fibre in (steel + PE) combination at a fixed fibre ratio at 2% reduced the fluidity of mixes containing them because of its relatively lower density [14][15]. Regarding the effect of the steel/PE fibre ratio at a fixed volume fraction, it can be observed from PE fibres) would generally drop the flowability of the HFRG composites.…”

“…Tables 1 and 2) are the ones producing the highest strengths or toughness, nevertheless other combinations can be found in the individual concerned studies. Moreover, the values indicated for the studies of [15] in Figure 5 are from the fracture toughness calculation instead of the flexural toughness. It can be observed from Figures 2-3 that compressive and tensile strengths of hybrid composites are typically in between the envelopes of the composites utilizing mono fibres.…”

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

“…In many existing studies on the durability and mechanical properties of AAS geopolymers regardless of "two-part" (i.e., liquid activators) or "one-part" (i.e., solid activators) mixing approaches, the use of GGBS and FA combination with a certain ratio as an aluminosilicate precursor achieves a geopolymer binder that can roughly meet the engineering requirements (Ismail et al, 2014;Bernal et al, 2015Bernal et al, , 2016Alrefaei and Dai, 2018;Alrefaei et al, 2019). The incorporation of highcalcium materials (i.e., to seed calcium species) with low-calcium raw materials (i.e., main source of alumina and silica) greatly affects the formation of the main binding gels (Bernal et al, 2016).…”

Fresh and Hardened Properties of Engineered Geopolymer Composite with MgO

“…In addition, application of large volume of solution based activators in the field is quite difficult due to high alkalinity and corrosive nature [25,29]. Some recent studies show that relative small quantities of alkali activators in powder form (as compared to solution based activators) can activate source materials at ambient temperature [25,30,31]. Therefore, difficulties associated with field application and production cost of geopolymer can be lessened by using dry mix of source materials and activators.…”