ACI Concrete/Masonry Exam Chapters 1-10 Questions with 100% Correct Answers |Latest Update 2024

ACI Concrete/Masonry Exam Chapters 1-10 Questions with 100% Correct Answers |Latest Update 2024 Concrete is sold by the ton T/F - Answer ️️ -False ( by Volume) Delays in discharging concrete trucks can result in the concrete being hard to: - Answer ️️ - Pump, place, and finish When there is room for two concrete trucks ready to discharge into a pump hopper, placement is faster because: - Answer ️️ -as one truck is finishing, the other is ready to unload concrete You can tell when water was added to the truck by looking at the: - Answer ️️ -Batch Ticket When concrete for a slab placement will be discharged from the truck chute, truck arrivals should usually be spaced about: - Answer ️️ -15 mins When finishers get behind because the concrete is setting faster than expected and the placing crew is also shorthanded, one solution is slowing the concrete delivery rate to match worker output. T/F - Answer ️️ -True In deciding how much concrete to order for a floor placement, you should calculate the number of cubic yards (cubic meters) needed to fill the forms, then order two to three cubic yards (cubic meters) less so you don't waste concrete that is not needed. T/F - Answer ️️ -False Concrete made with portland cement will set and harden while under water? T/F - Answer ️️ - False If a concrete slab on ground won't be exposed to sulfates, the cement used is most likely to be: - Answer ️️ -Type I Most concrete used in slabs on ground has course aggregate with a maximum size of: - Answer ️️ -3/4 to 1 1/2in Sand for concrete used in slabs on ground is easier to finish when it has close to the largest allowable amount of material passing the No. 50 and No. 100 sieves. T/F - Answer ️️ -True Increasing the amount of sand in a concrete usually decreases the amount of water needed to make the concrete workable. T/F - Answer ️️ -False All concrete that will be subject to freezing when moist or be exposed to deicing salts should contain: - Answer ️️ -An air-entraining agent Strength of normal weight concrete depends mainly on: - Answer ️️ -water-cement ratio Over sanded concrete mixtures are likely to produce floors with poor wear resistance and excessive shrinkage. T/F - Answer ️️ -True To minimize shrinkage and reduce cracking and curling: - Answer ️️ -Much course aggregate Little mixing water Aggregate low shrinkage (All of the above) Air-entrained concrete is not recommended for use in concrete slabs: - Answer ️️ -Finished by reparation steel troweling passes Changes in concrete temperature affect: - Answer ️️ -Setting time Air content Slump ( All of the above) To determine if concrete, in place, has the strength needed to put into service, test cylinders should be: - Answer ️️ -Kept at the job site and cured under conditions similar to the curing conditions for the concrete they represent Granular subbases for slabs on ground can be compacted with sheepsfoot rollers. T/F - Answer ️️ -False Before a concrete slab on ground is placed under severe drying conditions that threaten plastic shrinkage cracking, water should be sprayed on the subgrade until puddles are formed and the surface is soft. T/F - Answer ️️ -False Before concreting, workers should check the elevation of the subbase by: - Answer ️️ - Measuring down from a straightedge spanning between the side forms If the surface of the subbase for a concrete slab on ground is too low, the slab is likely to be too thin. T/F - Answer ️️ -False Which of the following placing sequences for casting slabs-on-ground is not recommended - Answer ️️ -Checkerboard Which of the following have the greatest effect on floor levelness? - Answer ️️ -Form setting and screedi