Comp CPC 18 Measurement of hardened concrete carbonation depth, Title: CPC 18 Measurement of hardened concrete carbonation depth, RILEM CPC () Measurement of Hardened Concrete Carbonation Depth. has been cited by the following article: TITLE: Anticorrosive Effect of. RILEM CPC, “Measurement of Hardened Concrete Carbonation Depth,” . has been cited by the following article: TITLE: Carbonation Resistance and.
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Durability of concrete – accelerated carbonation and weathering studies. Enter the email address you signed up with and we’ll email you a reset link.
Brighton UK, November. Carbonation depths in structural-quality concrete: A typical irregular carbonation profile Figure 8: Influence of marine micro-climates on carbonation of reinforced concrete buildings. Figure 2 shows the location of each beam within the bridge whilst in service. One way to prove if this material is suitable for durable concrete structures is by determining the carbonation coefficient of the material.
Scaled photographs of each concrete surface were taken prior to and after the application of the indicator. Measuring the depth of carbonation. Click here to sign up. However the majority of these reports show results for real-life concrete structures, often using average carbonation depths obtained from one or two small cores. The author is indebted to J.
Table 1 provides a summary of the condition of each beam. The atmospheric carbonation coefficients are also presented in Table 5. In relation to the cross-section, greater carbonation was more likely towards the upper parts of the beam cross- section and at junctions. The compressive strength results were above the nominal values, particularly for 0.
The northern facing webs from Beams A and C and the southern facing web of Beam B exhibited greater carbonation than the respective opposing web faces. Concrete carbonation – more prevalent than chloride attack Down Under? Following concerns regarding the condition of the prestressing steel, the bridge was demolished in For Beams B and C, two isolated areas of reduced pH were detected by the phenolphthalein indicator an example is shown in Figure Carbonation profiles were predominantly irregular Figure 7.
To cpncrete the extent of the carbonation, a phenolphthalein indicator is sprayed on freshly cut, cored, broken or drilled concrete surfaces often adjacent to superficial carbonatiob. In places with tropical climate, atmospheric conditions may encourage the CO 2 aggressiveness [ 1 ]. The effect of exposure and concrete quality: For the present study, the carbonation profile mostly follows the incidence of aggregate.
The follow matters were investigated: Construction and Building Materials. The longitudinal web cracking was expected to influence significantly the development and depth of the carbonation front. Note the strong colour response of the grout.
However, some aggregates have absorption levels above these values. Materials Science Forum VolumesPart 2. The porosity of concrete is related to the porosity of both the cement paste and the aggregate and the proper compaction during casting. Journal of Materials in Civil Engineering.
Each web face, top and base flange surfaces were then calculated and recorded. Further research is required to assist in the development of improved carbonation field investigations Keywords: Investigations on the carbonation of concrete. Additional research is required to investigate these findings further. Both sources are gratefully acknowledged.
For the current study, the majority of locations with longitudinal cracking coincided with deeper carbonation, especially for the lower duct in Beam C Figure Remember me on this computer. Corrosion of Steel in Concrete. Swedish Cement and Concrete Research Institute; The accumulation of aggregate was observed to influence the carbonation profile B A C Figure 9: Report of the Building Research Board for the Year A review of carbonation in reinforced concrete.
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Better understanding of these effects and their subsequent influences will require further research, preferentially on actual structures and taking account of geometry, orientation and environmental conditions. Carbonation fronts were irregular, but were not always influenced by aggregate. The observed colour change distinguishes between carbonated and non- carbonated zones. It has been estimated that for a precast concrete member, the K value is in the order of between 0.
The measurement of carbonation through chloride drill holes usually is not recommended due to the dust residue of deeper concrete, falsely implying the pH is higher than it may actually be.
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Average carbonation depths for all beams in most sample locations were significantly lower in comparison to maximum results. Secondly, it is well documented in the literature that the carbonation front in real-life concrete structures can be quite irregular and can occasionally exhibit maxima that extend far cpf-18 the average profile. It appears that only Castro et al. A study of carbonation in non-hydraulic lime mortars.
Each measurement was corrected from radial measurements in a cylinder into carbonation depth measurements that would be obtained in a semi-infinite plane [ 3 ].