Green concrete structures

Glavind, Mette

doi:10.1002/suco.201000022

Cited by 21 publications

(8 citation statements)

References 2 publications

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“…Its composition is essentially an over‐charge‐balanced calcium aluminosilicate framework. It contains at least two thirds by mass of glassy slag and possesses hydraulic properties when suitably activated . Its chemical compositions is mainly CaO‐SiO 2 ‐MgO‐Al 2 O 3 system.…”

Section: Introductionmentioning

confidence: 99%

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Application of geopolymer paste for concrete repair

Ding

Cheng

Dai

2017

Structural Concrete

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In this study, ground granulated blast furnace slag and coal fly ash were used as raw materials to prepare geopolymer paste as repair material for concrete structure. The functional properties, such as compressive strength, fluxural strength, and bonding strength between slag/fly ash based geopolymer paste and paste substrate were investigated. The SiO2 /Na2O molar ratio of the alkali activator plays an important role on the strength of geopolymer paste. The nature of the geopolymeric reaction product was examined using FTIR and NMR. The compressive strengths and flexural strength of the geopolymer paste were 47 MPa and 16 MPa, respectively. For concrete substrate bonded with geopolymer paste, the compressive strength test shows up to 120% repairing rate can be achieved. By comparing with Portland cement, it can be proved that the slag/fly ash based geopolymer paste has very good potential for further engineering development in the future.

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Section: Introductionmentioning

confidence: 99%

“…It contains at least two thirds by mass of glassy slag and possesses hydraulic properties when suitably activated. 21 Its chemical compositions is mainly CaO-SiO 2 -MgO-Al 2 O 3 system. The key glass network forming cations are Si 4+ and Al 3+ , and the divalent Ca 2+ and Mg 2+ act as network modifiers along with any alkalis present.…”

mentioning

confidence: 99%

Application of geopolymer paste for concrete repair

Ding

Cheng

Dai

2017

Structural Concrete

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“…Pozzolan‐active substances have been used as a part of cement‐based binders for over a century , , but their share in overall concrete production was marginal for a long time. The interest in cements containing pozzolan in the building industry only began to increase over the last few decades when the role of pozzolans as supplementary cementitious materials was generally accepted . The motivation was both economical and environmental in most cases.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, durability and hygrothermal properties of concrete produced using Portland cement-ceramic powder blends

Kulovaná

Vejmelková

Keppert

et al. 2016

Structural Concrete

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Blended Portland cement‐ceramic powder binder containing up to 60 % fine‐ground waste ceramics from a brick factory is used in concrete mix design as an environmentally friendly alternative to the commonly used Portland cement. The experimental analysis of basic physical characteristics, mechanical and fracture‐mechanical properties, durability properties and hygrothermal characteristics shows that the optimal amount of ceramic powder in the mix is 20 % of the mass of blended cement. The decisive parameters in that respect are compressive strength, liquid water transport parameters and resistance to de‐icing salts, which are not satisfactory for higher ceramics dosage in the blends. In the case of other parameters studied, the limits for the effective use of ceramic powder are higher: 40 % for effective fracture toughness and specific fracture energy, 60 % for frost resistance and chemical resistance to MgCl2, NH4Cl, Na2SO4, HCl and CO2. The water vapour diffusion coefficient is found to increase with increasing ceramics content, which for wet envelopes can be considered as a positive feature, but may have a negative effect for dry envelopes. The thermal conductivity of all mixes increases fast with growing moisture content; differences of up to 50 % between the dry and water‐saturated state values are observed. This has to be taken into account in energy‐related calculations.

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“…Great progress in this contextwasmade in Denmark in the last decade. Glavind et al [15,16] for example presented concretes with mean compressive strengths around 30 MPa in which cement was systematically replaced by reactive additives such as fly ash or slag sand as well as stone powders. Proske and Graubner et al [17] report about the development of low strength concretes, where Portland cement was successfully replaced by limestone powder, fly ash and composite cements and by which the environmental impact of the concrete was significantly lowered while maintaining sufficient strength and durability.…”

Section: Development Of Concretes With Low Environmental Impactmentioning

confidence: 99%

Design and Properties of Sustainable Concrete

Müller

Breiner

Moffatt

et al. 2014

Procedia Engineering

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Sustainable structural engineering follows the basic principle that the energy and resources consumption due to the construction and operation of a structure must be minimized. Relating to concrete structures this principle can be realized by the use of the material in the most efficient way considering its strength and durability within the service life of the structure. Againstthis background the presentpaper outlines methods to assess and reduce the environmental impact of concrete and means to increase itsperformance. The presented concept is applied to the concrete type with the greatest potential in sustainability, i.e. green concrete. Thereby, the basic principles of green concrete mix design are introduced and a systematic study of the influence of the cement content on the fresh and hardened concrete properties as well as on durability parameters is presented. From the results it can be seen, that green concretes possess a very high sustainability and, depending on the attack scenario,even might show acceptable durability characteristics whenthey are subjected to corrosive exposures.

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Green concrete structures

Cited by 21 publications

References 2 publications

Application of geopolymer paste for concrete repair

Application of geopolymer paste for concrete repair

Mechanical, durability and hygrothermal properties of concrete produced using Portland cement-ceramic powder blends

Design and Properties of Sustainable Concrete

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