ACI Concrete Exam Questions And Answers 100% Verified

ACI Concrete Exam Questions And Answers 100% Verified What must be done if the concrete drops below the top of the Slump mold while the top layer is being rodded? - answerAdd additional concrete to keep an excess of concrete above the top of the mold at all times Rod each layer ___ times uniformly over the cross section with the rounded end of the rod. - answer25 The slump mold is filled in _____ layers. - answer3 layers True or false the slump mold should be in a dry condition before beginning the test? - answerFalse. For use in the slump test, the tamping end on both ends of the tamping rod must be... - answerRounded to a hemispherical tip True or false the Anterior surface of the slump mold is allowed to have minor irregularities? - answerFalse The mold for making the slump test is in the shape of - answerThe frustum of a cone What is the maximum allowable time between obtaining the first and final portion of the composite samples? - answer15 minutes True or false the sample of concrete used for temperature determination must be rodded 25 time? - answerFalse What is the required shape of the tamping end of the tamping rod? - answerRounded to a hemispherical tip Is the measurement for slump is made from the top of the mold to what point of the concrete specimen? - answerThe displaced original center of the top surface of the specimen. True or false after the final rodding, the sides of the slump should be tapped lightly with the tamping rod - answerFalse Prior to lifting the mold, concrete must be removed from _____. - answerthe area surrounding the base If rodding is the method of consolidation being used, the measure must be filled in how many layers? - answer3 For a measure of 14 L [0.5 ft^3], what is the required number of strokes of the tamping rod for consolidation of each layer? - answer25 When rodding the middle and top layers, the tamping rod should penetrate into the layer below approximately how deep - answer1" or 25mm The end of the temperature sampling portion of the temperature measuring device is submerged a minimum of _____ into the freshly a mixed concrete - answer3" After the temperature of the concrete is read, what is then required? - answerReport the temperature What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete? - answerGently press the concrete around the device to prevent air from impacting the temperature read. What must be done to the sample container prior to sampling the concrete? - answerDampen (with water) True or false the temperature of concrete may be measured in a wheelbarrow - answerTrue The temperature of the concrete is reported to the nearest - answerDegree The direct reading of the final liquid level in the neck of the air meter, Is estimated to the nearest - answer0.25% True or false it is necessary to tap the sides of the measuring bowl after each layer has been rodded - answerTrue What must be done if there is a slight deficiency in the quantity of concrete in the measure following consolidation of the final layer? - answerAdd a small quantity of representative concrete before strike off What tools may be used to strike off the top surface of the concrete following consolidation of the final layer? - answerA strike-off bar; a metal, glass, or acrylic plate After rodding each layer, what should be done to the measure before adding another layer of concrete? - answerTap the sides of the measure smartly 10 to 15 times with the mallet In rodding the sample, how deep should the rod penetrate each layer? - answerRod bottom layer to full depth; rod second and final layer penetrating the previous layer about 25 mm (1 in.) When rodding the concrete sample, what is the specified number of strokes required for each layer? - answer25