Study on Carbonation of Mortar Beam Subjected to Cracking

Sharobim, Kamal; Tazawa, Ei-ichi

doi:10.2208/jscej.1989.408_167

Cited by 2 publications

(2 citation statements)

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“…9 Effect of type of cement on the relation between reacted Ca(OH)2 content and depth of carbonation [12] Effect of Cracks Japanese Concrete Institute (JCI) research committee on concrete cracking mentioned that even if all cover concrete is not carbonated the presence wide crack can develop the carbonation around reinforcing steel [25]. The author [26] studied the relation between the carbonation depth at the crack position of cement mortar made from different type of cement.…”

Section: Table (2)mentioning

confidence: 99%

“…The relation between crack width Fig. 11 The relation between crack depth and carbonation depth [26] and carbonation depth [26] Carbonation of Concrete Contains Chloride Ions After 10 years of exposure of concrete contain chloride ions in their mixes, the chloride content at different distances from surfaced was measured [15]. The chloride concentrations in concrete made with W/C ratio 0.40 and 0.65 are shown in Fig.…”

Section: Fig 10mentioning

confidence: 99%

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Prevention of Carbonation of RC Structures (Critical Review)

2022

International Journal of Advances in Structural and Geotechnica

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Carbonation of concrete is traditionally defined as the chemical reaction between atmospheric carbon dioxide and the products of cement hydration, particularly calcium hydroxide. This phenomenon will reduce an alkaline pH of concrete of approximately 12.6, whereas the carbonated concrete is more neutral with a pH value which may decrease to 8.3. The degradation mechanism which threatens the reinforcement is corrosion, but the alkaline environment will safeguard the protective film as the pH of the surrounding solution remains within certain limits. Carbonation is a threat as it lowers pH and so may bring the steel within the corrosion boundary. Thus, carbonation may be a factor in the initiation of corrosion. Carbonation itself does not attack the reinforcement but it may contribute significantly to a lowering of the defense mechanism inherent in the synergetic relationship between steel reinforcement and concrete. This paper presents literature review of different methods which can be used to prevent the carbonation of concrete of existing structures and new one. The prevention methods include the use of protective coatings, anti-carbonation coatings and admixtures. From the literature review, it can be concluded that carbonation of concrete can be eliminated and prevented by using some anti-carbonation coatings. Also, using of protective coatings and/or cement plastering will reduce the carbonation depth. Moreover, concrete quality and good construction practices are governing factors on the rate of carbonation. The treatment of existing carbonated reinforced concrete structures is discussed.

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Section: Table (2)mentioning

confidence: 99%

Section: Fig 10mentioning

confidence: 99%