Effect of pozzolanic materials and curing methods on the elastic modulus of HPC

Nassif, Hani; Najm, Husam; Suksawang, Nakin

doi:10.1016/j.cemconcomp.2004.12.005

Cited by 93 publications

(47 citation statements)

References 2 publications

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“…Consequently, from extrapolation of the results it could be suggested that lime-pozzolan concretes are less stiff than CEMI concretes of equivalent strength. The results are also compared with the empirical relationship between f cyl and E c of CEMI concretes containing pozzolanic additions, over a range of densities, as proposed by Nassif et al (2005) [45].…”

Section: E C and Compressive Strain Of Lime-pozzolan Concretesmentioning

confidence: 97%

Structural and durability properties of hydraulic lime–pozzolan concretes

Grist

Paine

Heath

et al. 2015

Cement and Concrete Composites

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Section: E C and Compressive Strain Of Lime-pozzolan Concretesmentioning

confidence: 97%

Structural and durability properties of hydraulic lime–pozzolan concretes

Grist

Paine

Heath

et al. 2015

Cement and Concrete Composites

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“…From the perspective of the properties particularly critical for bridge decks applications, ternary concrete with fly ash and silica fume appears to exhibit excellent resistance to chloride-ion penetration (Blomberg 2003, Jones et al 1997, Olek et al 2002, Olek et al 2003, Thomas and Bamforth 1999, Suksawang et al 2005a), good resistance to salt scaling (Blomberg 2003, Lawler et al 2005, Olek et al 2002, Streeter 1996, Suksawang et al 2005a) and good resistance to freezing and thawing (Blomberg 2003, Lawler et al 2005, Olek et al 2002. Furthermore, the elastic modulus and its rate of increase with time for concrete with 5% fly ash and 20% silica fume was found to be lower than that of control OPC concrete (Nassif et al 2005), which is beneficial from the standpoint of shrinkage cracking resistance. …”

mentioning

confidence: 99%

High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study Volume 2: Materials

Radlinski¹,

Olek²

2010

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IntroductionConcrete bridge decks are inherently exposed to harsh environment. They are known to undergo degradation due to numerous distresses, of which the most common are corrosion of reinforcement (caused by ingress of chloride through bulk concrete), freeze-thaw damage, shrinkage cracking (aggravating both corrosion and freeze-thaw problems) and surface scaling due to deicing salts.Recently, high performance concrete (HPC) has become widely utilized in the applications where severe environment leads to premature deterioration. The premise behind the development of HPC was to address the durability issues typical of normal concrete. HPC almost always implies incorporation of mineral admixtures, such as fly ash (FA) or silica fume (SF). These materials are added to concrete for variety of reasons, of which the most important is improvement (compared to plain ordinary portland cement (OPC) concrete) of certain durabilityrelated properties. However, there are also some downsides of utilizing them in concrete. For example, fly ash is known to reduce the early age strength and early age resistance to chloride-ion penetration, as well as resistance to salt scaling and carbonation. Furthermore, fly ash concrete has been reported to be fairly sensitive to curing conditions compared to plain cement concrete. The shortcomings of incorporating silica fume, on the other hand, include increased susceptibility to shrinkage cracking and potentially reduced resistance to freezing and thawing.In the view of the aforementioned side effects associated with the use of fly ash or silica fume in binary mixtures, the ternary cementitious systems have been introduced as a potentially viable solution to address those durability issues. Superior properties of this kind of cementitious systems are commonly attributed to so-called synergistic effect taking place when both pozzolanic materials are utilized. The intuitively obvious benefit of the use of OPC/FA/SF mixtures is that the presence of fly ash in concrete compensates for the deficiencies of silica fume, and vice versa. For example, FA offsets the increase in water demand, heat of hydration and alkalinity of pore solution resulting from addition of SF. On the other hand, SF compensates for the low early age strength and sensitivity to curing (with respect to development of both mechanical and durability-related properties of FA concrete). From the economical perspective, a relatively low cost of FA counterbalances higher cost of SF. Although a fairly large amount of research has been conducted to evaluate the properties of ternary cementitious mixtures containing fly ash and silica fume, relatively little was done with the emphasis on the durability-related issues encountered when these binder systems are used in the bridge deck concrete. Up to date, no data exists on the actual performance of ternary concrete containing class C fly ash and silica fume in bridge decks.The purpose of this research was to examine the applicability of ternary binder systems containing ordinary port...

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“…[16] tarafından bir dizi laboratuvar deneyi gerçekleştirilmiştir. Uçucu kül oranı %10-30, silis dumanı oranı %5-15 arasında değişmektedir.…”

Section: Introductionunclassified

Dolgu-Saplama Arayüzeyi̇ Kesme Di̇renci̇ni̇n Dolgunun Basinç Dayanimi İle Tahmi̇ni̇

Teymen¹

2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu makale, kaya saplamaları için geliştirilen dolgu malzemelerinin deneysel sonuçlarını içermektedir. Deneysel çalışmalar, mineral katkıların kaya saplaması ve dolgu arasındaki aderans dayanımına etkilerini kapsamaktadır. Literatürde mineral katkıların beton dayanımına etkileri ile ilgili çok sayıda çalışma bulunmaktadır. Ancak, bu katkıların saplamaların mekanik özelliklerine etkilerine dair çalışma sayısı oldukça azdır. Saplama çekme kapasitesini geliştirmek amacıyla 10 farklı dolgu malzemesi ve 4 farklı kür süresi için toplam 120 adet çekme testi gerçekleştirilmiştir. Kontrol dolgusu dışındaki dolgu karışımları, çimento ağırlığının ağırlıkça %15'i yerine mineral katkı kullanılarak hazırlanmıştır. Metakaolin ve silis dumanlı dolguların her yaşta daha yüksek dayanımlara sahip oldukları belirlenmiştir. Uçucu kül kullanılan dolgunun 28 günlük kür süresine kadar tüm dayanımları düşük değerler gösterirken sonrasında dikkate değer şekilde artmıştır. Çimentonun atık mineral katkılar ile birlikte kullanılmasıyla yüksek dayanımlı dolgular elde edilebilir ve bu dolgular tünelcilik uygulamalarında kullanılabilir. Böylece düşük maliyetli ve yüksek dayanımlı çimento üretilebilecektir ve atık kullanımı ile çevresel problemlerin çözümüne katkıda bulunulabilecektir.Anahtar Kelimeler: Kaya saplaması, dolgu, mineral katkı, metakaolin, silis dumanı ESTIMATION OF THE SHEAR STRESS OF GROUT-BOLT INTERFACE BY COMPRESSIVE STRENGTH OF GROUT ABSTRACTThis paper represents the experimental results of the grout materials developed for rockbolts. Experimental studies cover the effects of mineral admixtures on the bond characteristics between grout and rockbolts. There are many studies in the literature about the effects of mineral admixtures on concrete strength. However, the number of studies on the effects of these admixtures on the mechanical properties of rockbolts are quite limited. Totally 120 rockbolt pull-out tests were carried out using ten different grout types in order to improve the load bearing capacity for four different curing times. Grout mixtures outside the reference grout were prepared using mineral admixtures instead of 15% by weight of the cement weight. Metakaolin and silica fume additive grouts were found to have higher strengths at all ages. The all strength test of fly ash grouts exhibited low values till 28 days of curing time, but a sharp increase was observed after this period. It is concluded that cement, in combination with waste mineral admixtures, can be utilized in making high strength grout and such grout can be used as grouting material at tunnelling applications. Thus, grout having low cost and high-strength can be produced with waste materials and waste utilization will be contributing to the solution of environmental problems.

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Effect of pozzolanic materials and curing methods on the elastic modulus of HPC

Cited by 93 publications

References 2 publications

Structural and durability properties of hydraulic lime–pozzolan concretes

Structural and durability properties of hydraulic lime–pozzolan concretes

High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study Volume 2: Materials

Dolgu-Saplama Arayüzeyi̇ Kesme Di̇renci̇ni̇n Dolgunun Basinç Dayanimi İle Tahmi̇ni̇

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