First fifteen results, in N/mm², of a M25 concrete at a site are 21.5, 22, 21.9, 18, 19, 20, 19.8, 14.5, 17, 18.2, 16.1, 18.8, 20.9, 21.2, 20.2. The test result corresponding to the 16th sample is 21.9 N/mm². Assuming the quality control of the concrete samples to be very good, is this concrete acceptable?

First fifteen results, in N/mm², of a M25 concrete at a site are 21.5, 22, 21.9, 18, 19, 20, 19.8, 14.5, 17, 18.2, 16.1, 18.8, 20.9, 21.2, 20.2. The test result corresponding to the 16th sample is 21.9 N/mm². Assuming the quality control of the concrete samples to be very good, is this concrete acceptable?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Please short Answer/ Concrete technology.
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Pick out the correct statements from the following (Note: there may be more than one correct statement) Select one or more: A. A cement sample that have a specific surface area of 280 m2/Kg is expected to set faster than a sample of the same cement type that have a specific area of 160 m2/Kg B. Unsoundness of cement can cause cracking and even failure if the cement is restraint. C. Initial set of cement is caused by a selective hydration of C3A and C2S. D. The final set time of cement indicates the time at which the cement has completely hardened.