An experimental study on optimum usage of GGBS for the compressive strength of concrete

Öner, Adnan; Akyüz, S.

doi:10.1016/j.cemconcomp.2007.01.001

Cited by 464 publications

(202 citation statements)

References 13 publications

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“…From onwards, Portland-slag cement concretes indicated higher strength results comparing to PC concretes at all ages. This is coherent with existing studies that the hydration of GGBS is slower comparing to PC, therefore the reactivity of pozzolanic reaction between mineral admixtures and cement paste requires longer curing periods to compensate the early strength loss of concrete [2][3][4][5][6][7][9][10][11][12]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65…”

Section: Compressive Cube Strengthsupporting

confidence: 74%

“…Thus, initial formation of C-S-H gel was inhibited in CEM II and CEM V cement concretes [9]. Moreover, reduction in w/c ratio was observed not to have any influence on the minimizing early strength loss in contrast to Teng [3] and Qiang [10]. In addition, SF is known to densify the concrete mix when it is present due to its microfiller effect.…”

Section: Compressive Cube Strengthmentioning

confidence: 92%

“…Extensive research carried out on the use of GGBS in combination with PC and other cementitious constituents in concretes indicated that lower early compressive strength due to slower hydration rate of GGBS [2][3][4][5][6][7][8][9][10][11][12]. The lower early strength reported in the existing studies have become more obvious as the replacement levels, on mass basis, increases [2,8].…”

Section: Introductionmentioning

confidence: 99%

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Portland slag and composites cement concretes: engineering and durability properties

Bostancı

Limbachiya

Kew

2016

Journal of Cleaner Production

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The use of different cementitious main constituents is permitted within the BS EN 197-1 for use in concrete construction. The selection of cement types made depends on requirement of enhanced engineering and durability properties of concrete as well as exploiting potential for producing environmentally friendly concretes for practical applications. The main results of a laboratory experimental programme aimed at examining the performance of Portland-slag and composite cement (CEM II/B-S, CEM II/B-M, CEM V/A and CEM V/B) concrete mixes designed for equivalent 28-day compressive cube strengths of 40 and 50 N/mm 2 are reported in paper. The effect of up to 30-50% of ground granulated blast-furnace slag (GGBS) and its' combination with the silica fume (SF) and fly ash (FA) -within the BS EN 197-1 permitted limits-on fresh, engineering and durability properties have been established and its suitability for use in a range of practical applications was assessed.The loss of workability in all mixes was of a uniform nature and was found to be more for CEM V/B concrete mixes. Studies of hardened concrete properties, comprising bulk engineering properties (compressive cube and cylinder strength, flexural strength, drying shrinkage) and durability (initial surface absorption, carbonation rates) showed enhanced performance for Portland-slag and composite cement concrete mixes of equivalent strength, except resistance to carbonation.Keywords: Carbonation, drying shrinkage, durability, fly ash, ground granulated blast-furnace slag, initial surface absorption, mechanical properties, Portland cement, silica fume Bullet points:Lower w/c ratios did not have any influence on minimizing the early strength loss for equivalent 28-day strength concretes.Drying shrinkage results showed that the contribution of pozzolanic reactions for Portlandslag and composites cement concretes takes place after 14 days.Portland-composite cement concretes (PC+GGBS+SF) with higher w/c ratio showed improved pore structure.Carbonation resistance was observed to be linked with the loss of workability over time.

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Section: Compressive Cube Strengthsupporting

confidence: 74%

Section: Compressive Cube Strengthmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Portland slag and composites cement concretes: engineering and durability properties

Bostancı

Limbachiya

Kew

2016

Journal of Cleaner Production

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“…Generally, studies report similar or smaller pore entry sizes for blended cements [6,8,15,18], but the vast majority of studies used severe drying methods. Nevertheless, earlier studies indicate that there is an optimal replacement of SCM above which the refinement and the reduction of the pore volume are not occurring [19] which, as a consequence, decreases the mechanical properties of the paste [20,21]. It has also been reported that the degree of reaction of fly ash [19,22,23] or slag [5] may decrease when they are present at higher replacement levels.…”

Section: Introductionmentioning

confidence: 95%

Evolution of pore structure in blended systems

Berodier

Scrivener

2015

Cement and Concrete Research

253

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a b s t r a c t a r t i c l e i n f oIn this study, the effect of SCM in the cement paste was isolated by using ternary systems combining Portland cement, quartz and SCM. The results show clear differences in how the hydrates from the reaction of clinker, slag and fly ash fill space. The reaction of slag is more efficient than that of fly ash in modifying the porosity. Our results indicate that Portland cement (PC), slag and fly ash reactions are limited at later ages by the lack of water-filled capillary pores. The higher the space available, with increasing the water/solids ratio, the later the reaction is limited. This explains the lower degree of reaction of SCM in blended systems at high replacement levels.

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“…The quantity and 39 composition of the hydrates formed are dependent on the composition of the starting materials that 40 comprise the blend. Despite the slow hydration of the slag, leading to a lower degree of hydration at 41 very early ages, slag blends can outperform neat cement systems at later ages with respect to 42 strength 10,11 . The increased performance is dependent on both the phase assemblage and 43 microstructure.…”

mentioning

confidence: 99%

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Whittaker

Zając

Haha

et al. 2014

Cement and Concrete Research

150

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract: The effects on composite cements of the aluminium content of slag plus that of additional sulphate, has been investigated. Samples containing cement or composites with 40% replacement by one of 2 different slags, differing in aluminium contents, were prepared. A further blended sample was prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed comparable strengths to the neat cement system at later ages. Adding slag changed the hydration kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and encouraged the presence of hemicarbonate over monocarbonate. The Ca/Si ratios of the C-S-H formed were comparable between the two blends, being marginally lower than that of the neat system. The addition of anhydrite resulted in the adsorption of sulphate onto the C-S-H, plus stabilisation of ettringite. Corresponding Author 8 9 The Role of the Alumina Content of Slag, plus the Presence of AdditionalAbstract 10 The effects on composite cements of the aluminium content of slag plus that of additional sulphate, 11 has been investigated. Samples containing cement or composites with 40% replacement by one of 2 12 different slags, differing in aluminium contents, were prepared. A further blended sample was 13 prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed 14 comparable strengths to the neat cement system at later ages. Adding slag changed the hydration 15 kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased 16 that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and 17 encouraged the presence of hemicarbonate over monocarbonate.

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An experimental study on optimum usage of GGBS for the compressive strength of concrete

Cited by 464 publications

References 13 publications

Portland slag and composites cement concretes: engineering and durability properties

Portland slag and composites cement concretes: engineering and durability properties

Evolution of pore structure in blended systems

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

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