1. why is it important to test the specimens on (i.e. apply the load to) one of

Question

1. why is it important to test the specimens on (i.e. apply the load to) one of the sides that was cast against the polyethylene mold? What would be the likely result if the upper or free face of the specimen was used as one of the loaded faces during the compression test? 2. Compare the test results for the different curing conditions. Were the results as expected when compared to the standard curing conditions? 3. Refer to the results of the 7-day compression test using the standard curing conditions. Does your cement meet the specification requirements as stated in- table 2? 4. Why is it necessary to require such conditions

Explanation / Answer

1>..This way you insure that all other variables are minimized and you're really measuring the tensile properties of the material. If you allow variation with respect to the test specimen, then results may vary greatly because of the method ..................................................................................................................................................................................2>..yes the results was more or less similar to the expectation.........................................3>,no.........................................4> The next best thing is a mix that is mostly aggregate, finely graded to include all sizes from dust to boulders so that the amount of cement required to glue it together is minimized. The less cement, the stronger the concrete, provided that there is enough cement to hold it together.In general, a 1:2 mix will give better strength than a 1:3 mix. But it is quite possible that a 1:0.5 mix might perform worse. Strength comes from inter-particle force transfer between sand grains and also from shear resistance provided by cement acting as adhesive. Thus codes provide known balanced combinations that are satisfactory. ...........5>... A standard tamping procedure is specified for preparing the specimens this is because it will help in getting the desired amount of the strength.6>.... yes the degree of mixing important in determining the strength of the mortar........................the mortar will be broken and the constructed material will not last for long. 7>/.. the strength will decrease if the load is applied rapidly.......

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