Trends and developments in green cement and concrete technology

Imbabi, M.S.; Carrigan, Collette; McKenna, Sean Andrew

doi:10.1016/j.ijsbe.2013.05.001

Cited by 750 publications

(354 citation statements)

References 7 publications

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“…Solutions put forward include increasing energy efficiency, the use of alternative fuels, substitution of raw materials by other non-carbonated sources and the partial substitution of cement with supplementary materials (SCM), such as pozzolans and blast furnace steel slags, among others (Lothenbach et al, 2011;Imbabi et al, 2012;Díaz et al, 2013;Robayo et al, 2013). Another option is the development of cements that, keeping at least the characteristics of current cements, require less energy to manufacture and/or use other types of raw materials, therefore offering greater technical and environmental sustainability (Schneider et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Hybrid cement based on the alkali activation of by-products of coal

Rivera

Mejía

Gutiérrez

et al. 2014

Revista de la Construcción

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Manuscript Code: 0291 Date of reception/acceptation: 01jan2014/01aug2014Resumen Este estudio se propuso la producción de un material cementicio alternativo de bajo impacto ambiental a partir de la evaluación de dos subproductos de la combustión del carbón. Se elaboraron dos cementos híbridos basados en la activación alcalina de una ceniza volante (FA) y una escoria de parrilla (BS) y adicionados con cemento portland (OPC) hasta en un 30%. FA y BS contienen hasta un 16% de inquemados. Para la optimización de la resistencia a la compresión se utilizó la Metodología de Superficie de Respuesta (MSR). El geopolímero BS alcanzo alta resistencia a la compresión (>100 MPa a 28 días) y el geopolímero FA reporto 30 MPa al aplicar curado térmico. La adición de OPC contribuyo a modificar el método de curado. En el caso del hibrido basado en FA (HFA), se observó un incremento significativo en la resistencia a niveles hasta de 65 MPa a 28 días sin aplicar el curado térmico. AbstractThis study focuses on the production of an alternative cementitious material with low environmental impact through the evaluation of two-coal combustion by-products. Hybrid cements based on the alkali activation of fly ash, (FA) and boiler slag (BS) blend with a proportion of Portland cement (OPC) up to 30% were produced. FA and BS contain an unburned material up to 16%. Response Surface Methodology (RSM) was used to optimize the compressive strength. BS geopolymer achieved high compressive strength (>100 MPa at 28 days) and FA geopolymer reached 30 MPa with thermal curing. The addition of OPC helped modify the curing method. In the case of hybrid based on FA (HFA), there was a significant increase in the compressive strength with levels ranging up to 65 MPa at 28 days without requiring a thermal curing.Palabras claves: Cemento híbrido, ceniza volante, escoria de parrilla, materiales activados alcalinamente, baja huella de carbono.

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Section: Introductionmentioning

confidence: 99%

Hybrid cement based on the alkali activation of by-products of coal

Rivera

Mejía

Gutiérrez

et al. 2014

Revista de la Construcción

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“…Cement production is estimated to be responsible for 5-8% of the global CO 2 emission (Damtoft, Lukasik, Herfort, Sorrentino, & Gartner, 2008;Imbabi, Carrigan, & McKenna, 2013;Meyer, 2009). Predictions have shown that by 2050, carbon dioxide emissions will be five times higher than they were in 1990 if production processes do not change (Imbabi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Predictions have shown that by 2050, carbon dioxide emissions will be five times higher than they were in 1990 if production processes do not change (Imbabi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Optimized production processes, less carbon-intensive fuel usage, incorporation of recycled materials, and formulation of low-carbon cement are active areas of investigation (Damtoft et al, 2008;Imbabi et al, 2013;Schneider, Romer, Tschudin, & Bolio, 2011). Alternative solutions have also been proposed to capture the emitted CO 2 (Bukowski & Berger, 1979;Imbabi et al, 2013;Klemm & Berger, 1972).…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the Pore Structure of Carbonated Natural Wollastonite

Villani¹,

Spragg²,

Tokpatayeva³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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This paper focuses on examining the pore structure of a cementitious paste made with a calcium silicate (wollastonite) that reacts with carbon dioxide and water to form a hardened solid. The pore structure of the hardened solid has been characterized using vapor sorption and desorption, low-temperature differential scanning calorimetry (LT-DSC), and scanning electron microscopy (SEM). The total porosity was also measured using mass measurement in oven-dry and vacuum-saturated conditions. Evidence exists that support the hypothesis that the solid has two main pore sizes: large macropores (>10 nm) appear to form between the initial calcium silicate particles and small micropores (<10 nm) were found in the reacted silica gel. The bimodal nature of the pore structure was evident from the desorption and LT-DSC responses. The extent of reaction was also investigated and was found to be the result of the function of the raw material particle size: only particles with radius <10 µm were found to have entirely reacted even in highly reacted systems. Moreover, the degree of reaction influenced the uniformity of reaction across the sample. Only the highly reacted system showed a uniform microstructure with continuous reaction products path and low porosity.

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“…Indeed, the SSC has been commercially manufactured in Europe and India to reduce the impacts from OPC manufacture on high consumption of natural material and energy and air pollution caused by carbon dioxide emissions. In general, the SSC is comprised by mixture of 80-85% ground granulated blast furnace slag, 10-15% sulfate activator (anhydrite/gypsum) and low amount of OPC (normally 5%) [3][4][5]. Recently, to produce the SSC with lowered cost, the utilization of industrial waste gypsum such as flue gas desulfurization (FGD) gypsum was proposed to be used as sulfate activator instead of using commercial gypsum [6,7].…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties and Microstructural Performance of Low Energy Super-Sulfated Cement Using Industrial Waste Anhydrite

et al. 2017

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Abstract. This study aims at proposing the mix proportions of low energy super-sulfated cement (SSC) concrete from industrial waste anhydrite from circulating fluidized bed combustion (CFBC) fly ash (CFA) as an alternative sulfate activator of ground granulated blast furnace slag (GGBFS/slag). The optimized mix proportion of the SSC was carried out by using mixture of different amounts of CFA in range of 25-45 wt.% and various quantities of ordinary Portland cement (OPC) in range of 0 -10 wt.% to trigger the hydration of slag. Experimental results showed that with the expected slump at values of 190 -220 mm, the 28-day compressive strengths of the concrete with low energy SSC reached 43.69 MPa which can be feasibly applied for widely advanced construction materials. The OPC in range of 3 -5 wt.% and 25 wt.% of CFA were considered as the optimum ingredients of the activator and was suggested to be used for fabricating the low energy SSC concrete with the good performance on compressive strength, dynamic Young's modulus, UPV measurement, and stabilized change of length. The OPC additive up to 10 wt.% was encouraged to be used for producing the SSC concrete with significant reduction on creep.

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Trends and developments in green cement and concrete technology

Cited by 750 publications

References 7 publications

Hybrid cement based on the alkali activation of by-products of coal

Hybrid cement based on the alkali activation of by-products of coal

Characterizing the Pore Structure of Carbonated Natural Wollastonite

Engineering Properties and Microstructural Performance of Low Energy Super-Sulfated Cement Using Industrial Waste Anhydrite

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