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3 edition of Correlation of hardened concrete test methods and results found in the catalog.

Correlation of hardened concrete test methods and results

K. L. Saucier

Correlation of hardened concrete test methods and results

  • 202 Want to read
  • 14 Currently reading

Published by U.S. Army Engineer Waterways Experiment Station, Corps of Engineers in Vicksburg, Miss .
Written in English

    Subjects:
  • Concrete -- Testing

  • Edition Notes

    Bibliography: p. 15-16.

    Statementby K. L. Saucier.
    SeriesU.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss. Technical report C-69-2, Technical report C ;, 69-2.
    Classifications
    LC ClassificationsTA681 .T43 no. 69-2
    The Physical Object
    Pagination1 v. (various pagings)
    ID Numbers
    Open LibraryOL5014182M
    LC Control Number76601730

    More C Extensive mathematical derivations are kept to a minimum; instead, the Handbook refers to numerous original papers for those interested in more detailed information. On the authority of the charter granted to it by the Congress inthe Academy has a mandate that requires it to advise the federal government on scientific and techni- cal matters. The authors of each chapter are recognized specialists in the field who have served on technical committees for nondestructive testing. DOI:

    Proposed model for vertical hammer position The regression coefficient R2 values were found to be better in case of linear correlations than exponential ones for both hammer positions. Cracks create a direct pathway for moisture and harmful chemicals to enter concrete, which may compromise both the durability and structural performance. The current passing through the concrete is determined by an LCD which is connected to the cell. Absorption tests are best suited for cases with little or no hydrostatic pressure with intermittent moisture such as repelling rain from building facades.

    These reservoirs are connected to DC supply and the voltage of 60V is applied to the concrete specimen at both the ends for 6 hours. Department of Transportation. Products required to resist water under pressure must be evaluated using this testing method. Thus, research was needed to evaluate the durability of the concrete used in these applications and to recommend guidelines that address relevant aspects of EOT concrete to help achieve long-term performance, durability, and cost-effectiveness. Details of test data and calculation of average rebound number for both hammer position can be found in Appendix-A.


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Correlation of hardened concrete test methods and results by K. L. Saucier Download PDF Ebook

A permeability test should Correlation of hardened concrete test methods and results book considered the dominant test to evaluate the case whereby concrete is subjected to hydrostatic pressure. Introduction Compressive strength of materials is usually determined by subjecting them to tests that eventually destroy the sample.

A standard N-type Schmidt hammer was used for this purpose. These transducers primarily generate compressional waves at predominantly one frequency, with most of the wave energy directed along the axis normal to the transducer face.

For vertical hammer position summary of models and their graphical presentation is showed in Table 3 and Figure 4 respectively. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achieve- ments of engineers.

Ralph J. In contrast, a permeability test should be considered the main test to evaluate where concrete is subjected to hydrostatic pressure such as basements, water reservoirs, and tunnels.

Portable ultrasonic testing equipment are available. To minimize delays, Correlation of hardened concrete test methods and results book highway agencies use EOT rehabilitation strategies that allow work to be completed at night or during peri- ods of low traffic.

In case of PQC for rigid pavement, beam specimens are broken for flexural strength. The large deviations in strength can be narrowed down considerably by proper calibration of the hammer, which allows for various variables discussed earlier. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, on its own initiative, to identify issues of medical care, research, and education.

Absorption tests are best suited for cases with little or no hydrostatic pressure with intermittent moisture such as repelling rain from building facades.

Their research revealed that a combined method for the two tests is an improvement in the concrete strength estimation [7]. These problems are best studied through a coordinated program of cooperative research.

In summary, to get a better estimation of compressive strength of brick using rebound hammer, the hammer should be used in horizontal position and the proposed linear correlation should be used.

What it achieves in timeliness, however, it lacks in accuracy. Proposed model for vertical hammer position The regression coefficient R2 values were found to be better in case of linear correlations than exponential ones for both hammer positions.

Now measure the current passing through the concrete at different time intervals. Results and Discussions Average rebound number is calculated and revised if required rejecting the values with a difference of 5 units or more from the average.

Handbook on Nondestructive Testing of Concrete, Second Edition answers this demand by providing a thorough analysis of nondestructive testing used to evaluate concrete structures. Water permeability test These tests determine the true permeability of concrete by evaluating the resistance of concrete against the penetration of water under hydrostatic pressure.

Improper curing in concrete leads to the formation of cracks and in turn, it increases the permeability of concrete. Biparva can be reached by e-mail at alireza kryton.

Handbook on Nondestructive Testing of Concrete

Some limitations are: allowance for premature measurements before a steady state is achieved ; applied high voltage leads to an increase in temperature to the sample, and can cause physical and chemical changes resulting in unrealistic values; there can be misleading results largely due to the chemical composition of the pore solution, rather than Correlation of hardened concrete test methods and results book the true permeability; concrete resistivity, rather than permeability, is measured—resistance is calculated as volts divided by current and it has been shown there is a fair correlation between concrete resistivity and concrete permeability, but it is not the intended use of the RCP test; and low inherent repeatability and reproducibility.

Malhotra, V. Shafigh and H.The paper also has discussion on combined methods, when more than one nondestructive test method is used and condition assessment is based on the data obtained from Rebound Hammer, UPV & Core tests.

The aim of the paper is to address the field engineers engaged in evaluation of. duct a test-specific correlation procedure where a bound Number of Hardened Concrete; BS EN Testing Concrete in Struc- easy and inexpensive method to estimate con-crete strength properties. However, the results of the test on concrete are affected by various factors such as smoothness of the surface, geometric properties.

Compressive strength test results are primarily used to determine that the concrete mixture as delivered meets the requirements of the specified strength, ƒ′ c, in the job specification. Strength test results from cast cylinders may be used for quality control, acceptance of concrete, or for estimating.Standard Test Method pdf Compressive Strength of Cylindrical Concrete Specimens1 tion of Compressive Strength of Hardened Concrete Cyl-inders2 dance with Practices C 31, CC and C and Test Methods C 42 and C The results of this test method are used as a basis for.It is better if similar concrete at the same time be tested with one more non-destructive test method, such as concrete test hammer etc.

for conclusive results. REFERENCES 1. IS: (Part 1):Non-destructive testing of concrete Methods of test, part 1 Ultrasonic Pulse Velocity, BIS, New Delhi. 2.Read More: Ebook on hardened concrete. Compression Test and Slump Test for Quality Ebook.

Permeability of Concrete

Among the tests mentioned above, the two major tests mainly considered as quality tests are the compression tests and slump tests. If necessary, it is desired to conduct fresh concrete temperature and hardened concrete density determination tests.