Development of a shrinkage performance specifications and prediction model analysis for supplemental cementitious material concrete mixtures

Mokarem, David W; Weyers, Richard E.; Lane, D S

doi:10.1016/j.cemconres.2004.09.013

Cited by 62 publications

(25 citation statements)

References 2 publications

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“…The loss of free water causes little to no shrinkage but the loss of water from the capillaries, held by hydrostatic tension, causes significantly larger shrinkage (Güneyisi 2010). The addition of PFA and its smaller pore size will reduce shrink- age as drying shrinkage is directly associated with the pore size (Mokarema 2005).…”

Section: Free Shrinkagementioning

confidence: 99%

“…Güneyisi et al (2010) also supported their findings and reported that mineral admixtures such as PFA, GGBS and MK can reduce drying shrinkage of concrete, the higher the replacement level the higher the reduction in the shrinkage of concrete. However, Mokarema et al (2005) concluded that the addition of mineral admixtures, fly ash, slag and microsilica in their case, into PC concrete resulted in greater drying shrinkage. Therefore, this research was also intended to investigate the effects of PFA and GGBS on drying shrinkage of concrete.…”

Section: Introductionmentioning

confidence: 99%

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Effects of PFA and GGBS on Early-Ages Engineering Properties of Portland Cement Systems

Zhou

Slater

Wavell

et al. 2012

ACT

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A comprehensive study is presented on the effects of pulverised fly ash (PFA) and ground granulated blast furnace slag (GGBS) on early-age engineering properties of Portland cement (PC) systems. It has been found that partially replacing PC by PFA or GGBS resulted in longer setting times but better workability with PFA exhibiting more prominent effect than GGBS. As the replacement level increased, the setting of both PFA and GGBS pastes further delayed but workability of concrete was enhanced. PFA concretes exhibited consistently lower compression and splitting tensile strengths than PC ones. As the replacement level increased, strengths decreased. At the replacement level up to 30% by mass, GGBS concrete exhibited higher splitting tensile strength than PC concrete. However, as the replacement level further increased, it developed lower strength than PC concrete up to 21 days. Then, it managed to gain higher splitting tensile strength than PC concrete at the replacement levels up to 70% by mass at 28 days. Both PFA and GGBS can reduce drying shrinkage and the reduction effects became more significant as replacement level increased with GGBS performing better than PFA. Adding fibres into PFA concrete increased its splitting tensile strength and further reduced its drying shrinkage.

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Section: Free Shrinkagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of PFA and GGBS on Early-Ages Engineering Properties of Portland Cement Systems

Zhou

Slater

Wavell

et al. 2012

ACT

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“…Büzülme çatlakları riskinin azaltılmasında malzeme tasarımı açısından birçok önlem tipi bulunmaktadır [8]. Bunlardan çeşitli puzolanların ikamesi sonucu olumlu/olumsuz sonuçlar elde edilebileceği görülmektedir [9,10].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Erken yaş büzülme çatlaklarının lif içeren/içermeyen ultra yüksek performanslı betona gömülü donatı korozyonuna etkisi

Erten¹,

Yalçınkaya²,

Beglarigale³

et al. 2017

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Bu çalışmada, iki farklı başlangıç ortamında bekletilmiş lif içeren ve içermeyen ultra yüksek performanslı beton (UYPB) karışımlarının erken yaş (ilk 24 saat) büzülme özellikleri incelenmiştir. Erken yaşta oldukça yüksek mertebelerde büzülme gösteren karışımların kısıtlanmış halde bekletilmesi halinde oluşan çatlakların çelik donatının korozyon gelişimine etkisi deneysel olarak belirlenmiştir. Kısıtlanmış büzülme çatlaklarının çelik donatı korozyonu üzerinde bazı olumsuz etkiler yarattığı tespit edilmiştir. Ancak düşük su/bağlayıcı oranlı UYPB örneklerinin yüzeyinde çatlak oluşmasına rağmen, donatıyı korumada oldukça iyi performans gösterdiği görülmüştür. UYPB'nin en önemli özelliği, geçirimsiz yapısı nedeniyle sağladığı üstün durabilite (kalıcılık) özelliğidir. UYPB'nin kalıcılık özelliklerinin korunması için erken yaş çatlaklarının önlenmesi amacıyla gerekli önlemler alınmalıdır. Çalışma kapsamında yapılan analizler, uçucu kül ikamesinin ve mikro çelik lif takviyesinin çatlak oluşumunu azaltarak donatı korozyonuna karşı korumayı geliştirdiğini göstermiştir. In this study, early age (first 24 hours) shrinkage properties of Ultra High Performance Concrete (UHPC) mixtures with and without fibers, exposed to two different initial curing conditions, were investigated. The effect of early age shrinkage cracks on development of corrosion of steel reinforcement embedded in UHPC has been determined experimentally. Some negative effects of restrained shrinkage cracks on corrosion of embedded steel reinforcement were determined. In spite of the cracks formation on the surface of UHPC specimens with low water to binder ratio, the UHPC mixtures showed generally good performance in terms of the protection of rebar against corrosion. Although cracks formed on surfaces of impermeable UHPC mixtures, which consist of low water to binder ratio, UHPC showed generally good performance on the protection of steel corrosion. The most important characteristic of UHPC is superior durability due to its impermeable nature. In order to maintain the durability properties of UHPC, necessary precautions should be taken to prevent early age cracks. The analysis conducted in this study revealed that fly ash replacement and micro steel fiber reinforcement enhanced protection against corrosion of rebars by means of reducing crack formation.

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“…ASTM C157 is the standard test method for measuring the length change of concrete specimens using a comparator [4,5]. However, this method is in the category of the averaged shrinkage measurements.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Measurement in Concrete Materials using Cure Reference Method

2009

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This paper describes the details of using Cure Reference Method (CRM) to determine the shrinkage that develops in concrete materials. The technique involves the replication of diffraction grating on the concrete specimen during curing. After demolded, the specimen is stored in a chamber where a specific drying condition is maintained for 6 days. Every day in this period, the specimen is removed from the chamber and a set of the consecutive moiré fringe patterns are recorded with the help of a specially-designed stage. An automated fringe analysis program is developed to obtain the full-field displacement and strain information. Shrinkage as a function of location, time, and drying conditions is measured. A numerical method is developed in order to obtain material properties from the complex geometry used in the tests. The test in different drying condition and the ring test are performed, and their results are compared with FEA to validate the constructed model.

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Development of a shrinkage performance specifications and prediction model analysis for supplemental cementitious material concrete mixtures

Cited by 62 publications

References 2 publications

Effects of PFA and GGBS on Early-Ages Engineering Properties of Portland Cement Systems

Effects of PFA and GGBS on Early-Ages Engineering Properties of Portland Cement Systems

Erken yaş büzülme çatlaklarının lif içeren/içermeyen ultra yüksek performanslı betona gömülü donatı korozyonuna etkisi

Shrinkage Measurement in Concrete Materials using Cure Reference Method

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