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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Instances where carbonation adjacent to cracking was not detected by the phenolphthalein indicator were reviewed further. Concrete is the most used material for infrastructure development. Table of Contents Alerts.
Carbonation Coefficients from Concrete Made with High-Absorption Limestone Aggregate
Deterioration of Prestressed Concrete Bridge Beams. Average carbonation depths for all beams in most sample locations were significantly lower in comparison to maximum results. Swedish Cement and Concrete Research Institute; Due to the fact that mixture 0. Each measurement was corrected from radial measurements in a cylinder into carbonation depth neasurement that would be obtained in a semi-infinite plane [ 3 ].
A survey of the durability performance of post-tensioning tendons.
Advances in Materials Science and Engineering
Surfaces with a deep pink colour change indicate the pH is greater than 9. Additional resources pertinent to carbonation field investigations were also available . Depth profiles of carbonates formed during natural carbonation.
Three prestressed concrete beams of various condition were set aside from the bridge demolition for detailed examination and load testing, as reported previously[16,17].
Cement and Concrete Research. The measurement of the depth of carbonation in reinforced and prestressed concrete structures is typically determined via freshly cut cores or broken concrete surfaces often adjacent to superficial evidence of corrosion and sprayed with a pH indicator phenolphthalein solution.
Initially it was thought these cracks were associated with the load testing conducted on the beams prior to the carbonation assessment. However the majority of these cracks were associated with spalling or adjacent to corroding prestressing strands, therefore evidence of carbonation should be apparent.
The average carbonation coefficient was obtained from. Chapman and Hall London ; It is clear that further research is required to investigate the localised effects of aggregate and cementitious material on the progression of the carbonation front. Guide to Concrete Repair and Protection. The influence of longitudinal web cracking on the carbonation profile Figure Both sources are gratefully acknowledged. The results are presented in this paper. In the event of experiments with two different external CO 2 concentrationsusing separate specimens of the same concrete mixture, the time to reach a given carbonation depth in both specimens would be, for concentrationand, forthus, solving forsolving forfrom 4 and 7substituting 8 in 9solving forand then, the average carbonation coefficients obtained in 3 were converted to atmospheric carbonation coefficient using The porosity values were high, however, in the expected range for the type of high-absorption aggregate used and with little difference among the different mixtures [ 7 ].
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The longitudinal web cracking was expected to influence significantly the development and depth confrete the carbonation front. Building Research Station; Advances in Materials Science and Engineering.
Normal aggregates employed in concrete have absorption levels in the range of 0. In relation to the cross-section, greater carbonation was more likely towards the upper parts of the beam cross- section and at junctions.
The cementitious material was Ordinary Portland Cement with no mineral additions. The role of cracking in concrete is also known to influence the development and orientation measurwment the carbonation profile, with Vaysburd et al. Durability of concrete – accelerated carbonation and weathering studies. The unique opportunity of observing the carbonation profiles for a number of beam cross-sections has provided evidence that preferential carbonation can occur at a local level and is influenced by a number of factors, including geometry, orientation, the location of aggregate and local cementitious properties.