Why You Need to Do Concrete Strength Test?


Concrete must be tested for quality assurance. At times, it is conducted for assessing structural conditions in their final form and before performing any repairs on a structure. The compressive strength of concrete is determined as an estimate by correlating mechanical properties like ultrasonic wave velocity and surface hardness with lab-based destructive tests. Concrete strength is measured by a compression test, which will determine the ability of the material to resist loads that may compress it. Compressive strength is determined by crushing a cylindrical specimen of concrete in a compression testing machine. 

The results of a compressive strength test can be used to determine if the concrete mixture delivered to the construction site is able to meet the specified strength requirements for the job. Concrete cylinders are produced and cured following the procedures indicated in ASTM C-31, and the specimens are tested according to ASTM C-39. The test results depict the average of a minimum of two standard cured specimens from the same batch of concrete tested at the same time. The conventional strength requirement for concrete is 28 days. 

Design engineers may use the data to create and design the right structural elements. Contract documents will include that specified strength. The concrete mixture must produce a mean strength that is greater than the specified strength to minimise non-compliance with strength specification. Engineers follow a set of criteria for acceptance. For instance, the average of the three consecutive tests must exceed or be equal to the specified strength or fc', and that no strength test must be lower than fc' by over 500 psi or 3.45MPa, or by over 0.10fc' when it is over 500 psi (35 MPa). 

Results that fall under fc' do not necessarily mean failure to meet the specified requirements. Operators take certain factors into account, such as the probability of the concrete strength test being lower at about 10 percent than the specified length when the average test is at the recommended average fc'. Likewise, concrete failure may be attributed to the testing procedure and equipment used, too, especially if the handling, fabrication, testing, and curing failed to follow the standard procedures. Hence, it makes sense to use high-quality equipment and follow the recommended standard procedures for conducting a successful concrete strength test.
Location: Niddrie VIC 3042, Australia

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