Durability of concrete pipes subjected to combined steam and carbonation curing

Rostami, Vahid; Shao, Yixin; Boyd, Andrew J.

doi:10.1016/j.conbuildmat.2011.03.025

Cited by 207 publications

(57 citation statements)

References 14 publications

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“…Finally, the accelerated carbonation increased the mass loss at the range between 500 and 850°C, which are related to the carbonates. Carbonation increases the mass loss between 500 and 750°C related to the thermal decomposition of poorly crystallized CaCO 3 polymorphs and at the range between 750 and 850°C related to decomposition of the well-crystallized CaCO 3 , as also reported by Rostami et al [53]. According to Thiery et al [54], the well-crystallized calcite decomposes between 780 and 990°C, and the presence of vaterite and aragonite causes the carbonates to decompose at lower temperatures (680-780°C), while decomposition between 550 and 680°C is probably associated with amorphous calcium carbonate.…”

Section: Changes In the Hydration Products Due To Early Carbonationsupporting

confidence: 57%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

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The objective of this work is to show the effect of carbonation at early stages on fiber-cement composites and impact on hydration, chemical and dimension stability. Carbonation increased the content of CaCO 3 polymorphs and consumed Ca(OH) 2 and other hydrated calcium phases. Micrographs and energydispersive spectrometry showed the CaCO 3 formed is precipitated in the pore structure of the matrix, decreasing diffusion of Si, S, and Al during hydration. Therefore, a refining process of pore sizes is produced, and fiber-matrix interface in carbonated composites was improved, leading to volume stabilization of the composite, as indicated by lower drying shrinkage and lower porosity.

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Section: Changes In the Hydration Products Due To Early Carbonationsupporting

confidence: 57%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

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“…In this case, pure gas carbonation can simultaneously accelerate the strength, stabilize the dimension, and enhance the durability. By reducing the hydroxyl ion and precipitating CaCO 3 on the surface layer, carbonation curing could improve the concrete resistance to sulfate attack, freeze-thaw cycling, and acid attack [3]. Since carbonation is a CO 2 uptake process [4], recovered cement kiln CO 2 can be recycled into concrete products to make contribution to carbon emission reduction.…”

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confidence: 99%

Carbon Storage through Concrete Block Carbonation

El-Hassan¹,

Shao²

2014

JOCET

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Abstract-The effect of initial curing on carbonation curing of lightweight concrete masonry units (CMU) was examined. Initial curing was performed from 4 to 18 hours at a relative humidity of 50% and temperature of 25°C. Based on cement content, four-hour carbonation curing allowed concretes to uptake 22% to 24% CO 2 with initial curing and 8.5% without initial curing, while prolonged 4-day carbonation recorded an uptake of 35%. Carbonation curing can replace steam curing in CMU production to accelerate hydration and recycle cement kiln CO 2 in a beneficial manner.Index Terms-Concrete masonry unit, curing, carbonation, carbon uptake. I. INTRODUCTIONConcrete masonry units (CMU) have been widely used in building construction as load bearing and non-load-bearing walls. The North American market for concrete blocks and bricks is projected to increase to 4.3 billion units per year by 2014 [1].In comparison to cast-in-place concrete, masonry block structures not only exhibit superior performance due to precast quality, but also represent a low environmental impact construction system. With reference to 1 m 2 of solid concrete wall, a masonry wall using 200-mm CMU requires 48% less material due to internal cavities, leading to 65% less cement, and 65% less CO 2 emission.CMUs produced in North America are typically steam cured. While steam curing accelerates strength gain and shortens the production cycles, the process itself is energy intensive. It is estimated, for one cubic meter of concrete in block form, atmospheric pressure steam curing consumes 0.59 Gigajoules per m 3 of concrete and autoclave curing consumes 0.71 Gigajoules per m 3 of concrete [2].The alternative curing method for CMU production is carbonation curing which uses high purity carbon dioxide (99.5% of CO 2 ) or low purity flue gas (14% of CO 2 ) for accelerated hydration and durability improvement.However, carbonation curing has never been adopted in large-scale production. This was possibly because flue gas carbonation was not effective in hydration acceleration and Manuscript received June 10, 2013; revised July 23, 2013. This work was supported by the Natural Science and Engineering Research Council (NSERC) of Canada and Canadian Concrete Masonry Producers Association (CCMPA), and the supply of expanded slag aggregates by Lafarge Canada.Hilal El-Hassan is with the Dept. of Civil Engineering at the American University in Dubai, Dubai Media City, Dubai, UAE, and P.O. BOX 28282 (email: helhassan@aud.edu).Yixin Shao is with the Dept. of Civil Engineering and Applied Mechanics at McGill University, Montreal, Quebec, Canada, H3A 2K6 (email: yixin.shao@mcgill.ca). pure gas carbonation was expensive. The latter situation may change in the near future. Large quantities of high purity, low cost carbon dioxide could soon be available as regulations requiring reductions in CO 2 emissions are developed. In this case, pure gas carbonation can simultaneously accelerate the strength, stabilize the dimension, and enhance the durability. By reducing the hydroxyl i...

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“…The governing reactions are given by Equations (1)- (2). In addition to the fast strength gain, carbonation curing has also shown the improved chemical durability due to the elimination of calcium hydroxide on concrete surface [3] and the enhanced shrinkage resistance during the service [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…To facilitate early carbonation of fresh concrete with high water-to-cement (w/c) ratio of 0.53-0.70, vacuum carbonation was developed to remove the surface water to allow CO 2 gas to penetrate and enhance its compressive strength [10]. In order to manage the moisture content before the carbonation curing, preconditioning of the concrete samples in a controlled environment was also investigated to improve carbonation reactivity [3,[11][12][13][14]. There is apparent economic benefit to make early carbonation process work for fresh concrete curing.…”

Section: Introductionmentioning

confidence: 99%

Influence of moisture content on CO₂uptake in lightweight concrete subject to early carbonation

Morshed

Shao

2013

Journal of Sustainable Cement-Based Materials

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Early-age carbonation curing of fresh concretes has shown its capacity to accelerate the production, recycle CO 2 , and to improve the concrete performance. The challenge facing this technology is the moisture content in fresh concrete which impedes CO 2 diffusion. This paper studies the effects of moisture content on carbonation reactivity of lightweight concretes (LWCs). The moisture content in LWC was adjusted by varying (1) the water to cement ratio, (2) the moisture carried in by lightweight aggregates, (3) the moisture removed by forced fan drying, and (4) the externally added water by surface spray as compensation of water loss. The performance of the carbonated concretes was evaluated by carbon uptake, strength gain, plastic shrinkage, and pH values. A process involving vibration compact forming, preconditioning, carbonation, water compensation, and subsequent hydration proved to be effective in achieving high degree of carbonation and hydration.

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Durability of concrete pipes subjected to combined steam and carbonation curing

Cited by 207 publications

References 14 publications

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Carbon Storage through Concrete Block Carbonation

Influence of moisture content on CO₂uptake in lightweight concrete subject to early carbonation

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Durability of concrete pipes subjected to combined steam and carbonation curing

Cited by 207 publications

References 14 publications

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Carbon Storage through Concrete Block Carbonation

Influence of moisture content on CO2uptake in lightweight concrete subject to early carbonation

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Influence of moisture content on CO₂uptake in lightweight concrete subject to early carbonation