A study on carbonation depth prediction for fly ash concrete

Published on Nov 1, 2006in Construction and Building Materials6.141
路 DOI :10.1016/J.CONBUILDMAT.2005.01.052
Jittbodee Khunthongkeaw3
Estimated H-index: 3
(SIIT: Sirindhorn International Institute of Technology),
Somnuk Tangtermsirikul18
Estimated H-index: 18
(SIIT: Sirindhorn International Institute of Technology),
T. Leelawat1
Estimated H-index: 1
(MU: Mahidol University)
Sources
Abstract
Abstract Carbonation of fly ash concrete is studied by using two types of fly ash with different CaO contents. It is observed that under natural exposure environments, the carbonation rate is the highest when specimens are exposed in the city. The decreased ratio of water to binder and fly ash content leads to a better carbonation resistance. For the same fly ash content, specimens of high-CaO fly ash show a better carbonation resistance than those of low CaO fly ash. However, when compared at an equal strength, the effect of the type of fly ash on carbonation becomes insignificant. When comparing the carbonation results of concrete and mortar specimens, results of mortar show similar trends as those of concrete. However, the test results on mortar are worse by the use of fly ash than those of concrete. In addition, the carbonation tests in an accelerated environment are also conducted. It is found that there exist strong relations between carbonation depths of concrete exposed in natural and in accelerated environments. A mathematical approach to predict the carbonation depth in the natural environments is proposed based on the accelerated tests and the square-root- t -law.
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This study deals with the carbonation of concrete incorporating ground granulated blast-furnace slag (GGBS), fly ash (FA), and silica fume (SF). It is observed that a decreased water-to-binder ratio and replacement level of GGBS, FA, or SF, or an increase in GGBS fineness and curing age in water, led to better carbonation resistance. However, compared to a plain concrete, the concrete incorporating mineral admixtures (except GGBS with higher fineness and SF) generally showed lower resistance to ...
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Abstract An accelerated carbonation test was carried out in order to assess the carbonation of fly ash (FA) concrete. The process of carbonation was accelerated using a controlled environment. The concrete mixtures made with 0, 50 and 70% replacement of normal Portland cement (NPC) with fly ash were prepared. Water鈥揷ementitious material ratios were ranged from 0.28 to 0.55. Some concrete mixture was also made with a superplasticizer. Comparisons were made to evaluate the influence of FA on the c...
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