The effect of peat and wood fly ash on the porosity of mortar

Rissanen, Jouni; Giosuè, Chiara; Ohenoja, Katja; Kinnunen, Päivö; Marcellini, Mirco; Ruello, Maria Letizia; Tittarelli, Francesca; Illikainen, Mirja

doi:10.1016/j.conbuildmat.2019.06.228

Cited by 21 publications

(7 citation statements)

References 34 publications

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“…Other minerals identified in the X-ray analysis were calcite and portlandite, present at 7.0% and 2.8%, respectively. Similarly, the same minerals, but in different amounts, were found in BFA by other researchers [47,48].…”

Section: Parameters Of Bfasupporting

confidence: 72%

The Impact of High-Alkali Biofuel Fly Ash on the Sustainability Parameters of Concrete

Nagrockienė,

Pundienė,

Kanapeckienė

et al. 2023

Buildings

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The results of this research show that high-alkali biofuel fly ash (BFA) had a significant influence on the mechanical characteristics, microstructure, porosity, freezing–thawing cycle resistance, and ASR resistance of cementitious materials. Different amounts of BFA (varying from 0 to 30%) were used as a substitute for cement in concrete mixes. The impact of substituting cement with BFA on the cement hydration products was analysed. Slump behaviour, mechanical properties, water absorption, porosity, freeze–thaw cycles, and ASR resistance were studied. The analysis of the mechanical and physical characteristics of the developed sustainable concrete revealed that a better structure, higher compressive and flexural strength and density values, and better freeze–thaw and ASR resistance as well as lower water absorption values were achieved when as much as fifteen percent of cement was substituted with high-alkali BFA. The calculations indicate that the substitution of cement with different quantities of high-alkalinity BFA (from 0% to 30% BFA) increased the SiO2/CaO ratio from 0.32 to 0.51 and the Na2O + K2O/CaO ratio from 0.02 to 0.067 in the composition. An evident higher quantity of the hydration products, reflected in the reduction of porosity by up to 27%, the improvement in compressive strength by up to 19.3%, and the calculated freeze–thaw resistance value of up to 51.50%, was observed when the Na2O + K2O/CaO ratio did not exceed 0.044. The ASR resistance of the concrete improved with the increase in the Na2O + K2O/CaO ratio. This study shows that BFA with high alkalinity is beneficial in the development of sustainable building materials.

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Section: Parameters Of Bfasupporting

confidence: 72%

The Impact of High-Alkali Biofuel Fly Ash on the Sustainability Parameters of Concrete

Nagrockienė,

Pundienė,

Kanapeckienė

et al. 2023

Buildings

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“…The water vapour permeability was reduced in all mortars compared to the reference, with 35% being the greatest decrease in M-MF. It has been reported that the incorporation of fine wastes, such the ones that come from C&DW [ 6 , 31 , 32 ] or fly ashes from peat and wood [ 33 ], was responsible for the decrease in water vapour permeability. EN 998-1 establishes a minimum of 1.3·10 −11 kg/m·s·Pa for being considered as repair mortar and thermal isolation mortar.…”

Section: Resultsmentioning

confidence: 99%

Performance of Sustainable Mortars Made with Filler from Different Construction By-Products

et al. 2022

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One way to contribute to sustainability in the construction sector is through the incorporation of construction by-products from their own activities. This work intends to extend the possibilities for enhancement of these by-products through the incorporation of four different ones, as fillers, in mortar production. The influence of these incorporations in mortar production was compared with a reference mortar with siliceous filler in its fresh state; workability, entrained air content and fresh density, and in its hardened state; capillary water absorption, water vapour permeability and shrinkage (up to 91 days); and adhesive, compressive, and flexural strength; the last two were studied over time (up to 180 days). Despite the reduction in compressive strength, both in the short and long term, there was a gain in adhesive strength when the construction by-products were incorporated. Regarding the physical properties and durability studied, no relevant differences were found with respect to the reference mortar. According to the European Specifications, these mortars could be used as regular or coloured rendering and plastering mortars, and masonry mortars, and these findings promote the circular economy in the construction sector.

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“…These curves present two parts; the rst linear part (S 1 ) is related to the lling of coarse capillary pores, whereas the second part is associated with the lling of smaller pores by inhibiting the secondary rate (S 2 ) [51]. The total amount of absorbed water, also called capacity, is related to the total porosity, pore size, and connectivity of the pores [52]. Figure 3 also includes the capacity and the initial rate of water absorption (Si) as a function of the ller content.…”

Section: Durable Properties Of Mortarsmentioning

confidence: 99%

Effect of dolostone fillers on the durable properties of mortars

Barsi,

Cordoba,

Trezza

et al. 2024

Preprint

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This paper investigates the durable performance of well-curing mortars with varying replacement levels of dolostone filler (0–30% by mass) in comparison with the same replacement of limestone filler and the stability of mortars with dolostone filler for 2 years at 40 oC. Compressive strength, total porosity, capillary water absorption, and chloride migration coefficients were determined. Results show that compressive strength decreases, and the total porosity increases with increasing filler content due to a dilution effect, regardless of the filler composition. The capillary water absorption and the chloride migration coefficients rise significantly for mortars with 20–30% filler. But, the dolostone filler cements have lower chloride coefficients than those with limestone blended cements. Mortars with dolostone show no length changes without later reduction of compressive strength, and XRD and FT-IR analyses suggest the formation of hydrotalcite-like phases.

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The effect of peat and wood fly ash on the porosity of mortar

Cited by 21 publications

References 34 publications

The Impact of High-Alkali Biofuel Fly Ash on the Sustainability Parameters of Concrete

The Impact of High-Alkali Biofuel Fly Ash on the Sustainability Parameters of Concrete

Performance of Sustainable Mortars Made with Filler from Different Construction By-Products

Effect of dolostone fillers on the durable properties of mortars

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