Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Uchima, Juan S.; Restrepo, Oscar Jaime; Tobón, Jorge Iván

doi:10.1016/j.conbuildmat.2015.07.104

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…They reported an increase of mechanical properties due to the influence times [9]. A similar trend was confirmed Uchima et al in their study use pozzolanic material (kaolinitic clay and rice husk) [10].…”

Section: Basic Physical Propertiessupporting

confidence: 77%

Properties of lime-cement plasters incorporating ceramic powder

Čáchová¹,

Koňáková²,

Vejmelková³

et al. 2017

Int. J. CMEM

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The effects of ceramic powder, a waste material, on the properties of lime-cement plasters were investigated in this article. The influence of the addition of the pozzolana as a supplementary cementitious material on mechanical and thermal properties of the studied materials was assessed in relation to its basic physical properties and pore structure characterization. Investigated parameters were bulk density, matrix density, open porosity, pore-size distribution, compressive strength, tensile strength, thermal conductivity and specific heat capacity. The results revealed the densifying effect of the pozzolana on the plaster microstructure as the open porosity decreased and bulk density rose to binder replacement level. Although the mean diameter of pores for plasters with higher amount of pozzolana was slightly higher, the volume of pores was lower. The presence of ceramic powder also showed a positive effect on the mechanical properties of plasters. Both compressive and tensile strength rose with increasing replacement ratio. Varying porosities were reflected in the increasing trend of thermal conductivity with rising binder replacement level. On the contrary, specific heat capacity showed the lower values the higher the amount of pozzolana.

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Section: Basic Physical Propertiessupporting

confidence: 77%

Properties of lime-cement plasters incorporating ceramic powder

Čáchová¹,

Koňáková²,

Vejmelková³

et al. 2017

Int. J. CMEM

View full text Add to dashboard Cite

show abstract

“…Likewise, in order to describe the pozzolanic behavior of different metakaolins, other simple linear correlation models have been defined, based on the dehydroxilation degree (Bich et al, 2009), the calcination temperature (Moodi et al, 2011) and the fixed lime percentage (Uchima et al, 2015).…”

Section: Data Reported By Different Authors Do Not Show a Good Correlmentioning

confidence: 99%

Reactividad puzolánica de arcillas caoliníticasuna revisión

2017

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Pozzolans have demonstrated to be highly efficient mineral additions in the concrete industry, because they reduce the environmental impact generated by the cement manufacture, improve the physical, chemical and mechanical properties of blends, and reduce costs. Calcined clays have been recognized as very good pozzolans, because they improve the durability and compressive strength of mortars and concretes. However, data reported by different authors show a very high variability that makes its modelling difficult. In the same way, and based on a review of the scientific literature, the relationship between morphologic characteristics, thermal treatments and mineral composition of clays and its pozzolanic reactivity is shown; as well as with the chemical, thermal and mechanical methods for improving that reactivity.

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“…This peak becomes distinct by increasing the C3S content (lower replacement of cement by RM) (Frølich, Wadsö, & Sandberg, 2016). Also, it is noted in this peak a lower formation of C-S-H, related to the hydration of calcium silicates (Uchima, Restrepo, & Tobón, 2015).…”

Section: Hydration Heatmentioning

confidence: 72%

Effects of the incorporation of residue of masonry on the properties of cementitious mortars

Silva¹,

Lange²,

Delvasto³

2020

rdlc

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This paper presents results of an experimental study of a residue of masonry (RM), sampled from a construction and demolition waste (CDW), added as a supplementary cementitious material (SCM) to partially replace up to 50% of Portland cement in the preparation of mortars. The pozzolanic activity (fixed lime and strength activity index), setting time, heat of hydration, the (autogenous and drying) shrinkage and compressive strength tests were carried out. The results show how the RM has a positive activity because the increase of RM replacement level in the mortars generates a lower heat of hydration and autogenous and drying shrinkage. The fixed lime at 28 and 180 days, indicating that the RM exhibits in some degree pozzolanic activity and the Strength Activity Index (SAI) was 77.13% and 84.36% of the compressive strength of 100% OPC mortar at the 7 and 28 days respectively, which conformed to ASTM C311. These results indicate that RM should be considered appropriated for using as a supplementary cementitious material.

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Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Cited by 23 publications

References 22 publications

Properties of lime-cement plasters incorporating ceramic powder

Properties of lime-cement plasters incorporating ceramic powder

Reactividad puzolánica de arcillas caoliníticasuna revisión

Effects of the incorporation of residue of masonry on the properties of cementitious mortars

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