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Further well-designed controlled studies and long-term studies are needed, and researchers should focus on the variation in hard palate repair timing before 3 years of age and consider patient speech.
Repair timing may vary by region.
When calculating repair cost by probabilistic model, repair cost can be obtained at arbitrary service life not at repair timing unlike conventional deterministic model.
In the study, repair timing is calculated at T1 assuming the concrete with the same mix proportions and 10 mm of additional cover depth in order to evaluate an effect of extended service life.
In the results from probabilistic model, mean value of repair frequency, safety index (normalized parameter) at each repair timing, and the increasing standard deviation with repeated repair can be calculated with changes in repair numbers.
Case Repair timing (year) Initial service life OPC 11.8 SG30 18.2 SG50 24.3 Extended service OPC 14.1 SG30 22.8 SG50 31.3 Open image in new window Fig. 3 Calculation of chloride behavior for various mix proportions.
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Open image in new window Fig. 1 Concept of repair probability for the 1st repairing timing.
The probability for the case of no repairing (P1) can be calculated through Eq. (3) for the 1st repairing timing.
Open image in new window Fig. 9 Numbers of repairing timing with extension of intended service life.
The repairing timing and the related extension of service life are changed with variation of durability design parameter like cover depth and quality of concrete.
With a given exposure condition, service lives with normal probabilistic distribution are considered, and the effect of design parameters such as coefficient of variation of service life and 1st repairing timing are investigated.
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