ACI Field Grade 1 Questions & 100% Verified Answers | Latest Update | Already Graded A+

☑☑: Paver, Continuous Mixer, Stationary, Revolving elapsed time between obtaining the first and final portion of the composite sample shall not exceed? ☑: 15 min Start test for slump, temp, air within how how many minutes of obtaining the final portion of the composite sample? ☑: 5 min minimum sample size for making strength test specimen? ☑: 1ft^3 When sampling from paving mixer, obtain how many samples from different portions of the pile? ☑: 5 when sampling from a revolving truck mixer, collect how many portions at regularly spaced intervals during the middle portion of discharge? EXCELLENCE 2 ☑: 2 or more the stem of the thermometer is to be submerged how many inches into the freshly mixed concrete? ☑: 3 in. thermometer accuracy and range? ☑: 1F, 30F-120F thermometer verified within? ☑: 1 year how long must the thermometer remain in the concrete? ☑: 2-5 min temp is recorded to the nearest? ☑: 1F When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____. ☑: wet sieved over 1 1/2 in sieve EXCELLENCE 3 The tamping rod end for the slump test must be? ☑: 5/8" Spherical tip The surface of the slump cone spot must be? ☑: level and flat, rigid, damp, non absorbent how much time is allowed for raising the slump mold? ☑: 3-7 sec the slump is measured to the nearest _________ in? ☑: 1/4 in How much time is allowed to conduct the slump test from beginning to completion? ☑: 2 1/2 min minimum frequency of vibrator? ☑: 9000 psi a minute or 150Hz diameter of vibrating element must be? ☑: 3/4 in - 1 1/2 in Minimum thickness of metal strike off plat