مشروع البحث:
تقدير مقاومة ضغط الخرسانة باختبارات القلوب بمقاسات وظروف مختلفة .

صفحة عناصر بسيطة
dc.contributor.advisorد. محمد إبراهيم العبود
dc.date.accessioned2025-03-04T08:43:20Z
dc.date.available2025-03-04T08:43:20Z
dc.descriptionCore test is universally needed in the concrete industry to estimate the concrete strength and sometimes it becomes the unique test for safety evaluation of existing concrete structures. A comprehensive experimental study was carried out to estimate the factors affecting the interpretation of core test results. The program implicates five concrete mixes, five concrete classes (20, 30, 40, 50 and 60 MPa), three core diameters (150, 100 and 75 mm), four core aspect ratios (between 1 and 2), two sizes of coarse aggregates (10 and 20 mm maximum size), two coring directions. Vertically and horizontally Prototypes for concrete footings and columns were constructed. More than 270 cores were prepared and tested with the intention of tremendous number of concrete cylinders ( nine cylindrical specimens for each concrete mix design), sizes Ø 150x300, Ø 100x200 and Ø 75x150 mm were used. Results indicate that the core strength reduces with the increase in aspect ratio, the reduction in core diameter, the drilling perpendicular to casting direction, and the reduction in concrete strength. Statistical analysis has been performed to determine reliable strength correction factors that account for the studied variables. A simple weighted regression analysis of a model was carried out using the ‘‘Data Fit’’ software. A new model for interpretation of core test results is proposed considering all indicated factors affecting core strength. The model when calibrated against large number of test data shows good agreement. The proposed model can effectively estimate the in-situ concrete cylinder strength from core test results.
dc.description.abstractCore test is universally needed in the concrete industry to estimate the concrete strength and sometimes it becomes the unique test for safety evaluation of existing concrete structures. A comprehensive experimental study was carried out to estimate the factors affecting the interpretation of core test results. The program implicates five concrete mixes, five concrete classes (20, 30, 40, 50 and 60 MPa), three core diameters (150, 100 and 75 mm), four core aspect ratios (between 1 and 2), two sizes of coarse aggregates (10 and 20 mm maximum size), two coring directions. Vertically and horizontally Prototypes for concrete footings and columns were constructed. More than 270 cores were prepared and tested with the intention of tremendous number of concrete cylinders ( nine cylindrical specimens for each concrete mix design), sizes Ø 150x300, Ø 100x200 and Ø 75x150 mm were used. Results indicate that the core strength reduces with the increase in aspect ratio, the reduction in core diameter, the drilling perpendicular to casting direction, and the reduction in concrete strength. Statistical analysis has been performed to determine reliable strength correction factors that account for the studied variables. A simple weighted regression analysis of a model was carried out using the ‘‘Data Fit’’ software. A new model for interpretation of core test results is proposed considering all indicated factors affecting core strength. The model when calibrated against large number of test data shows good agreement. The proposed model can effectively estimate the in-situ concrete cylinder strength from core test results.
dc.identifier6908
dc.identifier.urihttps://dspace.academy.edu.ly/handle/123456789/1372
dc.subjectتقدير مقاومة ضغط الخرسانة باختبارات القلوب بمقاسات وظروف مختلفة
dc.titleتقدير مقاومة ضغط الخرسانة باختبارات القلوب بمقاسات وظروف مختلفة .
dspace.entity.typeProject
project.endDate2018
project.funder.nameهندسة التحكم والقياسات
project.investigatorخالد محمد الطويل
project.startDate2017
relation.isOrgUnitOfProject52cd64d5-0d11-4825-bf5e-bd826a9f6ea4
relation.isOrgUnitOfProject.latestForDiscovery52cd64d5-0d11-4825-bf5e-bd826a9f6ea4
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