Investigation on characteristics of blended cements containing pumice

Ulusu, Hayati; Aruntaş, Hüseyin Yılmaz; Gençel, Osman

doi:10.1016/j.conbuildmat.2016.05.030

Cited by 51 publications

(15 citation statements)

References 22 publications

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“…For example, Moraes et al (2015) observed that SEM image of specimen containing 15% of sugar cane staw ash have lesser amount of portlandite and more CSH as compare to contol specimen. 40 Similarly, Ulusu et al (2016) observed plate-shaped portlandite in SEM images for control motar specimens and needle shaped CSH crystals in mortar speciemen with 20% of pumice replaced with cement. 41 Table 6 shows the result of EDS analysis of control and specimens with 20% of SBA after 28 days immersed in NaOH solution at 80 C. It was observed that the ratio of CaO/SiO 2 was less in mixture with 20% of SBA compared to that of the control specimen.…”

Section: Micro-structural and Eds Analysismentioning

confidence: 90%

Prospective of sugarcane bagasse ash for controlling the alkali‐silica reaction in concrete incorporating reactive aggregates

Abbas

Sharif²,

Ahmed

et al. 2019

Structural Concrete

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Sugarcane bagasse ash (SBA) is a supplementary material widely used around the world for improving mechanical and durability properties of concrete. Main aim of this study was to examine the potential of SBA for controlling alkali-silica reaction (ASR) in concrete incorporating reactive aggregates. SBA and reactive aggregates were acquired from local industry and quarry. Mortar bar specimens were cast to investigate various dosages of SBA (i.e., 10, 20, 30, and 40% by cement weight) for mitigating the alkali-silica reactivity expansion as per ASTM C1260. Petrography analysis of aggregates revealed the presence of deleterious minerals, which are prone to ASR. Strength activity index and thermal analysis results confirmed the pozzolanic activity of SBA. Mortar bar results showed 20 and 40% decrease in ASR expansion for specimens incorporating 10 and 40% of SBA by cement weight, respectively. Moreover, scanning electron microscopy analysis showed no sign of cracks due to ASR for specimens incorporating SBA. The improved behavior of specimens with SBA addition was due to alkali absorption and dilution process leading to low CaO/SiO 2 ratio, confirmed through energy disperse X-ray spectroscopy. Therefore, it can be envisioned that full-scale implementation of SBA addition in concrete mixtures could mitigate land filling of this by-product and lead toward the development of eco-friendly and sustainable technique for controlling the ASR associated damages in concrete structures. K E Y W O R D Saggregates, alkali-silica reaction, durability, mortar bar, sugarcane bagasse ash

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Section: Micro-structural and Eds Analysismentioning

confidence: 90%

Prospective of sugarcane bagasse ash for controlling the alkali‐silica reaction in concrete incorporating reactive aggregates

Abbas

Sharif²,

Ahmed

et al. 2019

Structural Concrete

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“…An increase in the durability against magnesium sulfate attack has been observed in pumice-containing systems [153,154,156], as well as a reduction in shrinkage strain at longer drying durations. Good resistance to sulfuric acid attack has also been reported for pumice-containing concrete [153].…”

Section: Natural Zeolites and Pumicementioning

confidence: 91%

Supplementary cementitious materials: New sources, characterization, and performance insights

Juenger

Snellings

Bernal

2019

Cement and Concrete Research

727

171

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Conventional supplementary cementitious materials (SCMs), such as blast furnace slags or fly ashes, have been used for many decades, and a large body of knowledge has been collected regarding their compositional make-up and their impacts on cement hydration and concrete properties. This accumulated empirical experience can provide a solid, confident base to go beyond the status quo and develop a new generation of low-clinker cements composed of new types and combinations of SCMs.The need for new sources of SCMs has never been greater, as supplies of traditional SCMs are becoming restricted, and the demand for SCMs to reduce CO2 emissions from concrete production is increasing. In this paper, recent research on emerging SCM sources is reviewed, along with new developments in characterizing and qualifying SCMs for use and improved knowledge of SCMs on long-term concrete performance and durability. Keywords(B) Characterization; (C) Durability; (D) Blended Cement; (D) Filler; (D) Pozzolan Material Chemistry Used as SCM (Mt/y)Total volume est. (Mt/y) Comments Blast furnace slag Ca-Si-Al 330 300-360 Nearly fully used, latent hydraulic Coal fly ash Si-Al 330-400 700-1100 Subject to limitations on carbon content, reactivity Natural pozzolans Si-Al 75 Large accessible reserves Large variety/variability, often high water demand Silica fume Si 0.5-1 1-2.5 Used in high-performance concrete Calcined clays Si-Al 3 Large accessible reserves Metakaolin performs best, often high water demand Limestone CaCO3 300 Large accessible reserves Cementitious contribution in combination with reactive aluminates Biomass ash Si 0 100-140 Competition with use as soil amendment, high water demand, (for some: high alkali contents) MSWI bottom ash Si-Al-Ca 0 30-60 Expansive and corrosive components, leaching issues Steel slag Ca-Si-Fe 0 (negligible) 170-250 Various types, can contain expansive components (CaO) or leachable heavy C L reactivity Copper slag Fe-Si 0 (some as filler) 30-40 Low reactivity, leaching of heavy metals, more research needed Other non-ferro slags Fe-(Si)-(Ca) 0 (some as filler) 5-15 Mt/y each (FeCr, Pb, Ni) Low reactivity, leaching of heavy metals, more research needed

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“…Beton, birçok alt ve üst yapı teknolojilerinde yaygın kullanım alanına sahip dayanım, dayanıklılık ve ekonomi gibi birçok mühendislik özelliğini karşılayan dünyada en çok kullanılan yapı malzemesidir [1]- [3]. Yapıların işlevlerini öngörülen servis ömrü boyunca yerine getirilmesine durabilite ve kalıcılık olarak tanımlanmaktadır [4].…”

Section: Introductionunclassified

Yüksek Fırın Cürufu, Bazalt ve Üleksit Katkılı Beton Örneklerin Yüksek Sıcaklık Etkisi Altında Özelliklerinin İncelenmesi

Eken

Avşaroğlu

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Yapı elemanları için en önemli durabilite özelliklerinden birisi de yüksek sıcaklık etkisine maruz kaldıktan sonra göstermiş oldukları dayanımdır. Bu çalışmada, öğütülmüş yüksek fırın cürufu (İÖYFC), bazalt (BZ) ve üleksit (U) katkılarıyla üretilen beton örneklerin yüksek sıcaklık etkisi altındaki özellikleri araştırılmıştır. Bu amaçla, TS 802 standardında belirtilen şartlara uygun beton karışımında ince agreganın yerine kütlece yüksek fırın cürufu %10-20, bazalt %10-20 ve üleksit %1-2 oranlarında eklenmiştir. Yüksek fırın cürufu, bazalt ve üleksit katkılı 7 ve 28 günlük örnekler bir saat 600 ve 800 °C sıcaklık etkisinde bırakılarak havada ve suda olmak üzere iki farklı soğutma rejimine tabi tutulmuştur. Yüksek sıcaklığa maruz bırakılan örneklere basınç dayanımı ve ultrasonik dalga hızı deneyleri yapılmıştır. Ayrıca örnekler üzerinde 7 ve 28 günlük basınç dayanımı, ultrases geçiş hızı ve aşınma deneyleri yapılmıştır. 600 °C yüksek sıcaklık etkisine maruz bırakılan numunelerin havada soğutma sonrası basınç dayanım değerleri referans numunesine göre %40-%20-%8 oranlarında ve suda soğutma sonrası basınç dayanım değerleri referans numunesine göre %60-%55-%42 oranlarında İÖYFC10, İÖYFC20 ve U1 katkısının yüksek sıcaklık etkisine karşı dayanım değerlerini arttırdığı göstermektedir. Bu değerlendirme ile yüksek fırın cürufu ve üleksit katkısının ince agrega olarak beton karışımında yüksek sıcaklık etkilerine karşı dayanıklı beton üretiminde kullanılabileceğini göstermiştir.

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Investigation on characteristics of blended cements containing pumice

Cited by 51 publications

References 22 publications

Prospective of sugarcane bagasse ash for controlling the alkali‐silica reaction in concrete incorporating reactive aggregates

Prospective of sugarcane bagasse ash for controlling the alkali‐silica reaction in concrete incorporating reactive aggregates

Supplementary cementitious materials: New sources, characterization, and performance insights

Yüksek Fırın Cürufu, Bazalt ve Üleksit Katkılı Beton Örneklerin Yüksek Sıcaklık Etkisi Altında Özelliklerinin İncelenmesi

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