Carbonation of CH and C–S–H in composite cement pastes containing high amounts of BFS

Borges, Paulo Henrique Ribeiro; Costa, Juliana Oliveira; Milestone, Neil B.; Lynsdale, C.J.; Streatfield, Roger E.

doi:10.1016/j.cemconres.2009.10.020

Cited by 414 publications

(188 citation statements)

References 23 publications

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“…In parallel with this, it was also observed that SP demand required increased with the increased the replacement level of CMC in CEM II/B-M and CEM V/A mixes. This is in agreement with the previous studies [15,30,[33][34]50]. The effect of w/c on SP demand was more obvious for CEM V/A mixes compared to CEM II/B-M mixes.…”

Section: 1supporting

confidence: 83%

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Bostancı

Limbachiya

Kew

2016

Construction and Building Materials

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Sustainable development approach demands the use of environmentally friendly materials. One possible way to encourage sustainable approach is via use of Portland cement (PC) replacement through use of permitted cement constituents in conformity with BS EN 197-1, to lower carbon footprint, and use of recycled aggregates as permitted within BS 8500, to encourage sustainability. Thus, this research study aimed to produce low carbon and sustainable concrete. For this aim, engineering and durability properties of equal 28-day design strength (40 and 50 N/mm 2 ) concretes made with Portland-composite and composite cements, CEM II/B-M and CEM V/A respectively, and partially substituted coarse recycled (RA) and washed recycled glass sand (RGS), 25% and 15% respectively, aggregates was investigated. The loss of workability was found to be larger for particularly CEM V/A and recyled aggregate concrete (RAC) mixes. Studies of hardened concrete properties, comprising bulk engineering properties (compressive cube and cylinder strength, flexural strength, drying shrinkage) and durability (initial surface absorption) showed enhanced performance for CEM II/B-M and CEM V/A mixes of equivalent strength natural aggregate concrete mixes (NAC), except resistance to carbonation. However, the use of CEM II/B-M and CEM V cements in RAC mixes slightly reduced the engineering and durability properties compared to corresponding NAC mixes.Keywords: Carbonation, initial surface absorption, drying shrinkage, fly ash, ground granulated blast-furnace slag, silica fume, recycled glass sand, coarse recycled aggregate Bullet points:Use of CEM II/B-M and CEM V/A cements and coarse recycled aggregates and recycled glass sand in concrete production increased the required superplasticizer demand to achieve the similar consistency.CEM II/B-M cement recycled aggregate concrete mixes indicated either similar or slightly better loss of workability over time compared to corresponding CEM I cement RAC mix.The partial substitution of natural coarse and fine aggregates by 25% coarse recycled and 15% recycled glass sand aggregates reduced the compressive cube strength of concrete approximately by 10%.Recycled aggregates concrete mixes showed dramatically lower compressive cylinder strength results compared to conventional natural aggregate concrete mixes.Drying shrinkage results showed that the contribution of pozzolanic reactions for Portlandslag and composites cement concretes takes place after 14 days.CEM II/B-M cement mixes indicated lower ISAT-10 values as the design strength class increased.Carbonation penetration results showed improvement as the design strength increased for the same cement type concrete mixes.

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Section: 1supporting

confidence: 83%

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Bostancı

Limbachiya

Kew

2016

Construction and Building Materials

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“…Hui-sheng [7] stated that carbonation resistance reduces as the slag content (15%, 30%, 45% and 60%) increases for the same w/c ratio. Similar findings were observed by Younsi [19] and Borges [20] with the slag contents up to 75% and 90% respectively leads to reduction in the carbonation resistance. In contrast, Qiang [13] stated that concrete with 15% slag content indicated better resistance whereas lower resistance monitored by 30% slag replacement.…”

Section: Introductionsupporting

confidence: 76%

“…In contrast, Qiang [13] stated that concrete with 15% slag content indicated better resistance whereas lower resistance monitored by 30% slag replacement. However, previous studies [7,17,[19][20] reported that increasing the binder content of slag results in lower carbonation depth comparing to lower binder contents. Akçaözoğlu and Atiş [4] reported that there is a relation between carbonation resistance and loss of workability.…”

Section: Introductionmentioning

confidence: 90%

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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“…It is reported in the literature that blended cements give the C-S-H with a low ratio C/S (Borges et al 2010). Effectively, Sagawa and Nawa (2007) showed that the C/S ratio of C-S-H in a blast furnace slag cement is about under 1.6 and remarkably decrease below 1.0 from carbonation, while this value in an ordinary Portland cement is about 1.8 at the age of 91 days in water curing.…”

Section: Nitrogen Adsorption and Water Adsorptionmentioning

confidence: 98%

Effects of Carbonation on the Microstructure of Cement Materials: Influence of Measuring Methods and of Types of Cement

Phạm

Prince

2014

Int J Concr Struct Mater

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The objective of this work was to examine the influence of carbonation on the microstructure of cement materials. Different materials, which were CEM I mortar and paste, CEM II mortar and paste, were carbonated at 20°C, 65 % relative humidity and 20 % of CO 2 concentration. The specific surface area and pore size distribution were determined from two methods: nitrogen adsorption and water adsorption. The results showed that: (1) nitrogen adsorption and water adsorption do not cover the same porous domains and thus, we observed conflicts in the results obtained by these two techniques; (2) the CEM II based materials seemed to be more sensible to a creation of mesoporosity after carbonation than the CEM I based materials. The results of this study also helped to explain why observations in the literature diverge greatly on the influence of carbonation on specific surface area.

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Carbonation of CH and C–S–H in composite cement pastes containing high amounts of BFS

Cited by 414 publications

References 23 publications

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Portland slag and composites cement concretes: engineering and durability properties

Effects of Carbonation on the Microstructure of Cement Materials: Influence of Measuring Methods and of Types of Cement

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