Estimation of engineering properties of selected tuffs by using grain/matrix ratio

Korkanç, Mustafa; Solak, Burak

doi:10.1016/j.jafrearsci.2016.05.008

Cited by 23 publications

(9 citation statements)

References 44 publications

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“…In the work of Capaccioni et al [ 38 ], volcanic tuffs are analysed as a means of predicting lung cancer risks based on some inherent properties of these rocks, such as: radionuclide content, emanation power and air exchange rate, among others. The study of the grain/matrix ratio of some tuffs, as proposed by Korkanç and Solak [ 39 ], is suitable for the estimation of their engineering and geomechanical properties. Volcanic tuffs have been used in the construction of historic buildings and monuments that are preserved despite alterations caused by weathering processes [ 40 ].…”

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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“…Hence, tuffs in building sector are its additional application in cement production [12,13]. ese research results are conductive to reveal the tuffs characteristics in engineering applications [14].…”

Section: Introductionmentioning

confidence: 97%

Investigation on Physicomechanical Properties and Constitutive Model of Tuff in Mila Mountain Tunnel under Dry and Saturated Conditions

Pei

Cui

et al. 2021

Advances in Civil Engineering

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Many tunnel engineering accidents are generally caused by water softening tuff of high porosity. Experimental and theoretical analytical methods, including rock ultrasonic testing, X-ray diffraction (XRD), microscopic observation, uniaxial compression test, and scanning electron microscope (SEM), are employed to analyze the physicomechanical properties of tuff in Mila Mountain tunnel under dry and saturated conditions. Then, the mechanism of tuff softening in water is explained. Finally, the statistical damage constitutive model of tuff is established. It was revealed that the tuff compositions were dominated by quartz and clay minerals accounting for more than 90%, and clay minerals, anhydrite, and pyrite were mainly soluble minerals. After being saturated with water, the soluble minerals in the tuff are dissolved, and the porosity and wave velocity are increased; however, the elastic modulus and peak strength are decreased, indicating that water softening was distinct. Water softening after saturation was due to the mineral compositions and microstructure characteristics of tuff in Mila Mountain tunnel; specifically, as the tuff characterized by high porosity was conductive to water absorption, the soluble minerals in the tuff were corroded and swelled by water, dissolving, loosening, and softening the tuff structure; then, its mechanical behavior was degraded. It was demonstrated by the experimental results consistent with theoretical results that the model can be employed to express the constitutive behavior of tuff in Mila Mountain tunnel under dry and saturation conditions. The findings provide insights into macroscale deterioration of tuffs and theoretical knowledge for the tunnel excavation and support of Mila Mountain tunnel.

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“…Niğde yöresindeki kültürel yapılarda kullanılan taşların özellikleri ve bu taşlarda meydana gelen bozunmalarla ilgili çalışmalar genellikle tarafımızca yapılmış olup, daha sonra birkaç çalışma daha eklenmiştir. [3,16,19,[22][23][24]. Ülkemiz ve dünyada bu tür yapılar için taş değişimi veya yeniden inşası durumunda, orijinal taş ihtiyacına yönelik kapsamlı çalışmalar da kısıtlı sayıdadır.…”

Section: Introductionunclassified

Ak Medreseni̇n (Ni̇ğde) Yapiminda Kullanilan Taşlarin Mühendi̇sli̇k Özelli̇kleri̇ Ve Sorunlari

Korkanç¹

2020

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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tarafından yaptırılmıştır. Bazı onarımlar görerek günümüze kadar gelen medrese, orijinal durumunun muhafaza etmekte olup, dönem medrese yapıları arasında en önemlilerinden birisidir. Yapı, Cumhuriyet döneminden itibaren farklı amaçlar için kullanılmaktadır (okul, müze deposu, kütüphane vb.). Bu tür yapıların korunması ve gelecek nesillere aktarılması için bakımlarının düzenli bir şekilde yapılması gerekmektedir. Bu çalışmada yapıda kullanılan taşların jeomekanik özellikleri ve sorunlarının belirlenmesi amaçlanmış olup, alınan üç örnek üzerinde taşların karakteristik özellikleri belirlenmiştir. Yapıda temel seviyesine yakın kesimlerdeki yapı taşlarında zemin suyuna bağlı olarak önemli oranda bozunmalar gözlenmiştir. Anıtta restorasyon aşamasında gerçekleştirilen drenaj uygulamasından sonra da anıtın bazı kesimlerde zemin suyu ile ilişkili olarak renklenme, çiçeklenme ve taşın dayanımın azalması sonucunda yüzeysel ve bazı kesimlerde oldukça önemli miktarda taş kayıpları gözlenmiştir. Restorasyon uygulamalarında yörenin orijinal taşının kullanılmadığı belirlenmiş olup, yerine kullanılan restorasyon taşların özellikle kapiler bölgede bozunma sürecini hızlandırdığı belirlenmiştir.

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Estimation of engineering properties of selected tuffs by using grain/matrix ratio

Cited by 23 publications

References 44 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

Investigation on Physicomechanical Properties and Constitutive Model of Tuff in Mila Mountain Tunnel under Dry and Saturated Conditions

Ak Medreseni̇n (Ni̇ğde) Yapiminda Kullanilan Taşlarin Mühendi̇sli̇k Özelli̇kleri̇ Ve Sorunlari

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