Carbonation Of Slag Concreteeffect Of The Cement

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Carbonation of slag concrete: Effect of the cement ...

01/01/2013  The carbonation coefficients increase as the replacement of cement by slag in the concrete increases. The carbonation resistance of BFS concrete is poor and although curing for longer times (up to 3 months) increases the resistance, the performance remains low, especially for cement replacement levels of 70% and above. –

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Carbonation of slag concrete: Effect of the cement ...

Carbonation of slag concrete: Effect of the cement replacement level and curing on the carbonation coefficient – Effect of carbonation on the pore structure - ScienceDirect Cement and Concrete Composites Volume 35, Issue 1, January 2013, Pages 39-48

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Carbonation of slag concrete: Effect of the cement ...

Carbonation is the process in which atmospheric carbon dioxide penetrates into the cementitious materials and reacts with cement hydrates to precipitate various forms of calcium carbonate (CaCO 3).

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Carbonation of slag concrete: Effect of the cement ...

Abstract Concrete containing supplementary cementitious materials as, e.g. fly-ash (FA) or blast-furnace slag (BFS) is more vulnerable to carbonation than ordinary Portland cement concrete. In order to know whether carbonation-initiated corrosion is a risk within the life span of the concrete structure, the carbonation depth after several years (e.g. 50 years) is mostly predicted based on ...

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Carbonation of slag concrete: effect of the cement ...

Concrete containing supplementary cementitious materials as, e.g. fly-ash (FA) or blast-furnace slag (BFS) is more vulnerable to carbonation than ordinary Portland cement concrete. In order to know whether carbonation-initiated corrosion is a risk within the life span of the concrete structure, the carbonation depth after several years (e.g. 50 years) is mostly predicted based on accelerated ...

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Carbonation of slag concrete: effect of the cement ...

Concrete containing supplementary cementitious materials as, e.g. fly-ash (FA) or blast-furnace slag (BFS) is more vulnerable to carbonation than ordinary Portland cement concrete. In order to know whether carbonation-initiated corrosion is a risk within the life span of the concrete structure, the carbonation depth after several years (e.g. 50 years) is mostly predicted based on accelerated ...

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(PDF) Carbonation Curing of Slag-Cement Concrete for ...

CO 2 (%) = 0.785 (CaO – 0.7 SO 3) + 1.091 MgO + 1.420 Na 2 O + 0.935 K 2 O (1) The cement had a carbonation capacity of 49.6%, the slag cement 49.4%, and the GGBF 40.7%. 5. The fine aggregate ...

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Carbonation of slag concrete_Effect of the cement ...

提供Carbonation of slag concrete_Effect of the cement replacement level and curing on theword文档在线阅读与免费下载,摘要:Carbonationofslagconcrete ...

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Carbonation Curing of Slag-Cement Concrete for Binding CO2 ...

Early age carbonation curing of slag-cement concrete was investigated to assess the feasibility of binding CO2 in slag-cement building products while improving their short-term and long-term performances. Four binder types were compared: an ordinary portland cement; an 85/15 slag cement; a 75/25 slag blend; and a 50/50 slag blend. A 2-h carbonation-curing treatment allowed concretes to

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Carbonation and Permeability of Blastfurnace Slag Cement ...

Quality and performance of site-stored concrete blocks and structural-quality concretes from actual structures, where concretes contained different levels of ground granulated blast furnace slag as cement replacement material, have been assessed in terms of carbonation and gas or water permeability. First, 100 and 150 mm concrete cores were cut from site-stored concrete blocks and tested to ...

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Carbonation of Reinforced Concrete - Ronacrete

The rate of carbonation in new concrete will be affected by the water/ cement ratio and the cement content; the connectivity of the capillary pore structure and size of the pores in concrete with a W/C ratio ≤ 0.4 and a cement content ≥ 400kg/m 2 will be reduced when compared to concrete with a W/C ratio > 0.4 and a cement content ˂ 400kg/m 2, making progress of the carbonation front ...

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Effects of Fly Ash on Carbonation of Concrete With ...

01/08/1991  The research was mainly devoted to portland blast furnace slag cement because this cement has a major market share in the Netherlands. It has been concluded that in the case of portland blast furnace slag cement concrete, replacement up to 25 percent by mass results in a substantially higher carbonation rate, while for a similar portland-cement concrete, the difference between concrete

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Carbonation of cement paste: Understanding, challenges ...

01/08/2016  A systematic review of literature related to mechanisms of carbonation in cement paste is given. ... Carbonation of slag concrete: effect of the cement replacement level and curing on the carbonation coefficient–effect of carbonation on the pore structure. Cement Concr. Compos., 35 (1) (2013), pp. 39-48. Article Download PDF View Record in Scopus Google Scholar. P. Sulapha, S.

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Corrosion of Embedded Materials - Portland Cement Association

Pozzolans and slag also increase the concrete resistivity thus reducing the corrosion rate even after it initiates. ACI 318-11, ... Carbonation of concrete also lowers the amount of chloride ions needed to promote corrosion. In new concrete with a pH of 12 to 13, about 7,000 to 8,000 ppm of chlorides are required to start corrosion of embedded steel. If, however, the pH is lowered to a range ...

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Carbon sequestration of steel slag and carbonation for ...

01/01/2021  The carbonation degree of steel slag and RO phase increases with the carbonation time. Steel slag can react with CO 2 quickly in a short period of time (first 30 min), while RO phase hardly reacts with CO 2. Steel slag has high carbon sequestration ability, steel slag of 100 g can sequester more than 12 g of CO 2 within a few hours.

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Carbonation of slag concrete: effect of the cement ...

Carbonation of slag concrete: effect of the cement replacement level and curing on the carbonation coefficient: effect of carbonation on the pore structure Journal Contribution - Journal Article

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Carbonation of slag concrete_Effect of the cement ...

提供Carbonation of slag concrete_Effect of the cement replacement level and curing on theword文档在线阅读与免费下载,摘要:Carbonationofslagconcrete ...

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Carbonation Curing of Slag-Cement Concrete for Binding CO2 ...

Early age carbonation curing of slag-cement concrete was investigated to assess the feasibility of binding CO2 in slag-cement building products while improving their short-term and long-term performances. Four binder types were compared: an ordinary portland cement; an 85/15 slag cement; a 75/25 slag blend; and a 50/50 slag blend. A 2-h carbonation-curing treatment allowed concretes to

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Accelerated carbonation and performance of concrete made ...

Abstract. Steel slag has been used as supplementary cementitious materials or aggregates in concrete. However, the substitution levels of steel slag for Portland cement or natural

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Slag Blended Cement Paste Carbonation under Different CO2 ...

Slag, an industrial by-product, has been considered as an excellent admixture used worldwide in concrete constructions [13,14].In concrete manufactured with slag to supplement Portland cement, the CH generated from cement hydration can be partially consumed, which decreases the alkalinity of the admixture and generates the C-S-H with a Ca/Si ratio of about 1 [15,16].

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Carbonation of Portland Bast Furnace Slag Cement Concrete ...

An extensive research program was performed on the rate of carbonation of concrete produced with ordinary portland cement, portland blast furnace slag cement, and portland fly ash cement, both with replacement of cement by fly ash and without. After various periods of wet curing, concrete samples were exposed to various exposure conditions. The wet curing ranged from 1 to 90 days, the exposure ...

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Carbonation of Reinforced Concrete - Ronacrete

The rate of carbonation in new concrete will be affected by the water/ cement ratio and the cement content; the connectivity of the capillary pore structure and size of the pores in concrete with a W/C ratio ≤ 0.4 and a cement content ≥ 400kg/m 2 will be reduced when compared to concrete with a W/C ratio > 0.4 and a cement content ˂ 400kg/m 2, making progress of the carbonation front ...

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Carbonation of concrete - Understanding Cement

Carbonation is the result of the dissolution of CO 2 in the concrete pore fluid and this reacts with calcium from calcium hydroxide and calcium silicate hydrate to form calcite (CaCO 3 ). Aragonite may form in hot conditions. Within a few hours, or a day or two at most, the surface of fresh concrete will have reacted with CO 2 from the air.

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Effects of Fly Ash on Carbonation of Concrete With ...

01/08/1991  The research was mainly devoted to portland blast furnace slag cement because this cement has a major market share in the Netherlands. It has been concluded that in the case of portland blast furnace slag cement concrete, replacement up to 25 percent by mass results in a substantially higher carbonation rate, while for a similar portland-cement concrete, the difference between concrete

Get Price

Carbon sequestration of steel slag and carbonation for ...

01/01/2021  The carbonation degree of steel slag and RO phase increases with the carbonation time. Steel slag can react with CO 2 quickly in a short period of time (first 30 min), while RO phase hardly reacts with CO 2. Steel slag has high carbon sequestration ability, steel slag of 100 g can sequester more than 12 g of CO 2 within a few hours.

Get Price