Pozzolanic activity of central Anatolian volcanic tuff and its usability as admixture in mortar

Biricik, Hasan; Karapinar, Işıl Sanri

doi:10.1680/jadcr.18.00033

Cited by 11 publications

(2 citation statements)

References 12 publications

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“…Other problems have been seen in the production process of companies that focus on technological properties [ 13 ] rather than on the intrinsic characteristics of these materials [ 14 , 15 , 16 , 17 ]. The use of tuff as a pozzolan has increased in recent decades in many parts of the world [ 18 , 19 , 20 , 21 , 22 ], with well-known results. Volcanic tuffs can match and outperform other minerals and industrial rocks, such as zeolites, bentonites, perlites, pumicites, trachytes, rhyolites and kaolinites [ 23 , 24 , 25 , 26 , 27 , 28 ], with regards to their cementing properties.…”

Section: Introductionmentioning

confidence: 99%

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

et al. 2021

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This work presents the results of the study of the physical, chemical, mineralogical and pozzolanic properties of the altered volcanic tuffs (AVT) that lie in the Los Frailes caldera, south of the Iberian Peninsula, and demonstrates their qualities as pozzolans for the manufacturing of mortars and pozzolanic cements of high mechanical strength. The main objective of this research is to show to what extent the AVTs can replace portland cement (PC) in mortars, with standardised proportions of 75:25% and 70:30% (PC-AVT). To achieve these objectives, three AVT samples were studied by a petrographic analysis of thin section (PATS), DRX, FRX and MEB. The pozzolanic properties were determined by three methods: electrical conductivity (ECT), chemical pozzolanicity tests (CPT) at 8 and 15 days and mechanical strength tests (MS) of the specimens at 2, 7, 28 and 90 days. Studies of a PATS, DRX, FRX and MEB showed that the AVT samples’ constitutions are complex where smectite (montmorillonite), mordenite, quartz, halloysite, illite, kaolinite, volcanic glass and lithic fragments coexist. The results of the ECT and CPT tests confirmed the pozzolanic properties of the samples analysed and proved an increase in mechanical strength from 2 to 90 days of testing.

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Section: Introductionmentioning

confidence: 99%

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

et al. 2021

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“…Kunal et al [13,14] discovered that a higher SiO 2 content in tuff powder results in a more pronounced pozzolanic effect, which favors the early development of compressive strength in tuff powder-silicate cement-based materials. However, other studies [9,15] have indicated that the inclusion of tuff powder may lead to varying degrees of reduction in the mechanical properties of concrete, possibly due to the lower SiO 2 content in the tuff powder used in these experiments.…”

Section: Introductionmentioning

confidence: 77%

Replacing Fly Ash or Silica Fume with Tuff Powder for Concrete Engineering in Plateau Areas: Hydration Mechanism and Feasibility Study

Li,

et al. 2024

Buildings

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Abundant tuff mineral resources offer a promising solution to the shortage of fly ash (FA) and silica fume (SF) resources as emerging supplementary cementitious materials. However, a lack of clarity on its hydration mechanism has hindered its practical engineering application. In this study, high SiO2-content tuff powder (TP) was examined to assess the mechanical and workability performance of mortar specimens with varying particle sizes of the TP as complete replacements for FA or SF. Microscopic analysis techniques, including X-ray diffraction (XRD), differential thermal analysis (DTG), and energy-dispersive X-ray spectroscopy (EDS), were employed to elucidate the hydration mechanism of the TP and its feasibility as a substitute for SF or FA. Results indicated that TP primarily functions as nuclei and filler, promoting cement hydration, with smaller particle sizes amplifying the hydration ability and increasing Ca(OH)2 and C-S-H gel content. The specimens with TP (median particle size 7.58 μm) demonstrated 9.2% and 29.9% higher flexural and compressive strengths at 28 days, respectively, compared to the FA specimens of equal mass. However, fluidity decreased by 23.1% accordingly. Due to TP’s smaller specific surface area compared to SF, the TP specimens exhibited higher fluidity but with decreased strength relative to the SF specimens. Overall, TP shows potential as a replacement for FA with additional measures to ensure workability.

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Assessment of Reusing Ferrochrome Slag Wastes in Mortar as SCMs

Işil

Biricik

2020

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Pozzolanic activity of central Anatolian volcanic tuff and its usability as admixture in mortar

Cited by 11 publications

References 12 publications

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Replacing Fly Ash or Silica Fume with Tuff Powder for Concrete Engineering in Plateau Areas: Hydration Mechanism and Feasibility Study

Assessment of Reusing Ferrochrome Slag Wastes in Mortar as SCMs

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