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Nt1310 Unit 3 Lab Report

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III. SUBSTANCE SPECIMEN AND TRYOUT STEP
Firstly, we needed to collect three categories of concrete prism specimens sized 100 mm x 100 m x 400 mm. After, we then had to ascertain that the specimens have fixed their w/c ratios in the concrete mixing with the measurement of 0.45, 0.50, and 0.55. Each category consists of three concrete specimens which will be intended for NIRAS measurement. We were also going to apply a local specimen especially for this tryout. We also applied Chinese standard Portland Cement (GB175-99) for this work in addition to mix the natural send collected from the river with fineness modulus of 2.6. as rough support, we were going to apply a specific crushed stone with particular diameter of 5 mm – 20 mm. We can notice …show more content…
Therefore, any micro-cracking corruptness in this tryout may be recognized from the specimen using solidification and liquefaction cycle on them. We find five specific cycles of solidification and liquefaction to be used i.e. 0 cycle, 25 cycle, 50 cycle, 75 cycle, and 100 cycle. The specimen was subtracted from the solidification-liquefaction apparatus for NIRAS measurement at every level of the step cycle. Afterward, the specimen is returned into a rubber container to carry on the next step of solidification-liquefaction cycle. The container were purified with some additional amount of fresh water before placing back the samples into the solidification-liquefaction apparatus in a disordered sequence and we did the same steps until 100 …show more content…
We put accelerometer together with the specimen at a position nearby to the end. To utilize impact loads to the specimen, we use an instrumental hammer and also tapped the specimen by an easy way in the placement nearby the other end to excite the fundamental resonance of the flexural vibration of the beam (specimen). The basic flexural resonance frequencies of specimens (28-day curing) blended with w/c ratios of 0.50, 0.55 are measured by the classical vibration theory (28): 2,125, 2,107, and 2001 Hz put in correct order from the geometry and material properties of concrete specimens (measured from the initial compression tests). The values of these measured theory are approximating the result from the tryout (please refer to table 4). We tapped the samples fifteen times with a particular strength for every tapping. We put the sample on a flexible and sof mat which enable the free rigid body motion of the sample without hitting the table on foundation. A signal conditioner manages and amplifies the vibration signals from the accelerometer to be further kept safely by an oscilloscope. Using Matlab®, frequency domain analysis for the time-domain signal is run and following the proper steps presented below, the nonlinearity parameter is extracted based on Eq.

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