The setting times of concrete are determined by measuring the penetration resistance of the mortar fraction of concrete. The force applied on the apparatus and the diameters of the probes used at corresponding forces are given. What are the initial and final setting times accordingly? Time after mixing (minute) 210 240 270 300 330 360 390 420 Force (kgf) 6.9 11.2 11.4 13.4 27.2 35.6 45.2 48.0 Probe radius (mm) 4.55 4.55 3.19 3.19 3.19 2.26 2.26 2.26 Ⓒa. Initial setting time:270 minutes, final setting time: 390 minutes O. O b. Initial setting time: slightly longer later 270 minutes, final setting time: slightly longer than 390 minutes O Initial setting time: slightly earlier than 270 minutes, final setting time: slightly longer than 390 minutes Od. Initial setting time: slightly longer later 270 minutes, final setting time: slightly earlier than 390 minutes Initial setting time: slightly earlier than 270 minutes, final setting time: slightly earlier than 390 minutes

The setting times of concrete are determined by measuring the penetration resistance of the mortar fraction of concrete. The force applied on the apparatus and the diameters of the probes used at corresponding forces are given. What are the initial and final setting times accordingly? Time after mixing (minute) 210 240 270 300 330 360 390 420 Force (kgf) 6.9 11.2 11.4 13.4 27.2 35.6 45.2 48.0 Probe radius (mm) 4.55 4.55 3.19 3.19 3.19 2.26 2.26 2.26 Ⓒa. Initial setting time:270 minutes, final setting time: 390 minutes O. O b. Initial setting time: slightly longer later 270 minutes, final setting time: slightly longer than 390 minutes O Initial setting time: slightly earlier than 270 minutes, final setting time: slightly longer than 390 minutes Od. Initial setting time: slightly longer later 270 minutes, final setting time: slightly earlier than 390 minutes Initial setting time: slightly earlier than 270 minutes, final setting time: slightly earlier than 390 minutes

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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