CSLB CONCRETE C8 LICENSE PRACTICE TEST 4 NEWEST 2025 EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!

CSLB CONCRETE C8 LICENSE PRACTICE TEST 4 NEWEST 2025 EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW! Which of the following tools is sufficient for the compacting of concrete in a small project? - Correct Answer Hand tamper" "At 50°F, how long should the concrete be protected to attain sufficient strength (normally 500 Psi)? - Correct Answer 48 Hours" "How many take-off methods are commonly used for concrete estimating activity in the industry? - Correct Answer 3 Explanation: There are three take-off methods commonly used for concrete take-off needs. UnitTake-off Perimeter Take-off Centerline Take-off" "Which of the following cost estimate methodologies is commonly used in a concrete construction planning project? - Correct Answer Unit Cost Method Explanation: The unit method is the more practical approach because it uses an operational unit as the base of cost. This cost includes each and every factor required to complete an operational unit. So, the accuracy of this method is based on practical work of the same type." "Which of the following arrangements can be used to keep the concrete at the recommended 50°F temperature for allowing proper setting? - Correct Answer Heaters OR Thermal blankets" "Which of the following factors directly impact each other in the process of cost estimation for a concrete building project? - Correct Answer Interest rate, Holding cost, Cost escalation" "Which of the following points are true about Work Breakdown Structure (WBS) in the planning of a construction project? - Correct Answer Decomposing of a task into doable, measureable, estimable , and schedulable units" "Which of the following statements is correct about the finishing of a concrete? - Correct Answer Concrete should be finished once bleed water and surface sheen disappear" "An excavation of 10 cubic meters is done on any soil. Which of the following statements is true about the refilling volume of that excavation with the same type of soil material? - Correct Answer More than 10 cubic meters" "What type of release oil is commonly used for the construction of wooden forms in the concrete industry? - Correct Answer Paraffin base oil" "What is the 'Swell Factor' for sandy loam soil when performing excavation work for a concrete structure? - Correct Answer About 1.1 to 1.2" "Which of the following building specification and cost estimating standard systems is accepted as ASTM standard? - Correct Answer UniFormat System" "Initial and final setting time values of concrete are normally considered from: - Correct Answer Mixing of water into cement material" "Form-exposed corners and edges are commonly beveled to avoid any chipping by using: - Correct Answer Chamfer strips" "Which of the following are the basic crafts used in estimating the concrete construction cost in the industry? - Correct Answer Ironworker, Carpenter, Teamster, Cement mason" "Which of the results of a concrete slump test has the highest workability? - Correct Answer True Slump Explanation: Workability is the ease or difficulty of placing concrete in a particular location. For example, a stiff but plastic mix with large aggregate would be workable in large open form but not in a wall with closely spaced reinforcement. Please note that the slump test is NOT a measure of workability, and it should not be used to compare mixes of entirely different proportions or containing different kinds of aggregate." "What is the maximum depth of a foundation footing commonly used in concrete construction? - Correct Answer 78"" "Which of the following factors should be estimated as earthwork components in project planning? - Correct Answer ALL OF THESE -Rough grading, Excavation, Soil backfilling -Soil compacting, Fill material compacting, Excavation -Excavated soil hauling, Soil backfilling, Rough grading" "According to American Concrete Institute ACI-301 standard, what is the maximum volume of concrete that requires a strength test of concrete? - Correct Answer Each 100 cubic yards" "What are the recommended sizes of granular for a floor slab or foundation of a small-to medium-size building? - Correct Answer 4" to 6"" "Which of the following are the main objectives of applying sealers on exterior concrete surfaces? - Correct Answer To keep salt and water out of the concrete" "What is the slab curling impact of direct placement of concrete on the moisture barrier as indicated by American Concrete Institute guidelines? - Correct Answer Slab curling increases" "Which of the following activities are recommended before placing the concrete into the forms? - Correct Answer Application of form release oil and water" "Which of the following is the standard spacing commonly used between two adjacent expansion joints on a 4" thick concrete slab? - Correct Answer 10 to 12 feet Explanation: The general rule of thumb is that the spacing should be 2 ½ feet for each single inch of slab thickness." "Which of the following characteristics should be available in a good sealant compound commonly used for expansion joint treatment? - Correct Answer ALL -Non - toxic -Tint - less -Insoluble" "What is the most common size or thickness of polyethylene sheet used as a moisture barrier (with/without sand layer) in the concrete industry? - Correct Answer 4 to 6 mil" "Which of the following fastening mechanisms holds the collar strongly fixed around the finished columns? - Correct Answer Friction" "If you want to place a crushed stone layer over the vapor barrier, which of the following thicknesses of polyethylene is it recommended to use? - Correct Answer 50 mil" "Which of the following are the types of footings commonly used in the concrete construction industry? - Correct Answer ALL -Pad footing, Strap footing, Combined footing -Spread footing, Isolated footing, Strip footing -Mat footing, Continuous footing, Raft footing" "What is the minimum slope-away recommended in the final grading of foundation backfilling after the placement of concrete? - Correct Answer ¼" per foot pitch" "Which of the following options is not related to concrete pouring preparation? - Correct Answer Legal site inspector should be available on site" "Which of the following concrete pouring strategies works well for a long normal slab? - Correct Answer Start from farther area of slab" "Which of the following pieces of equipment are commonly used for manual excavation for small buildings? - Correct Answer Crowbar , pickaxe, shovel Explanation: The answer is crowbar, pickaxe, and shovel because of the key phrase "small buildings" in the question." "Which of the following activities is performed to measure the quality of compaction a building foundation? - Correct Answer Proof Rolling" "How many methods of construction dewatering are commonly used in concrete building projects? - Correct Answer 3 Explanation: There are three dewatering methods as given below: Well points Sumps and ditches Relief wells" "Which of the following are the results of a concrete slump test carried out during the placing of concrete on site? - Correct Answer Zero, True, Shear , collapsed" "What is the unit of concrete quantity take-off? - Correct Answer Cubic feet" "Which of the following concrete pouring strategies is commonly adopted while filling stair steps? - Correct Answer From bottom to top" "How much water needs to be added to the concrete to increase the slump value of a cubic yard of concrete by one unit? - Correct Answer One gallon" "Which of the following factors increases the drying shrinkage as well as creeping in concrete structures ? - Correct Answer Low Temperature & Low Relative Humidity" "Which of the following are three major types of concrete project cost estimates that are commonly used in the project planning? - Correct Answer Preliminary Estimate, Detailed Estimate, Engineer's Estimate Explanation: Preliminary estimate is general conceptual estimate based on the conceptual design of a project. Detailed estimate is based on the detailed scope of work of the project. Engineer's estimate is the final estimate based on the project specifications and plans." "What is the recommended curing time for a normal concrete between 50°F to 70°F? - Correct Answer 7 Days Explanation: After 7 days, concrete will be able to withstand heavier loads, however, heavy machinery should still be kept away from the concrete." "Foundation false-work is commonly done with the help of: - Correct Answer Piling or Mudsill" "Which of the following statements about structural and non-structural concrete is correct? - Correct Answer Non - structural c oncrete uses lightweight concrete only" "What is the recommended waste ratio for ready mixed concrete commonly adopted in the industry? - Correct Answer 7.3%" "What is the standard weight of cement, sand, and aggregate, respectively, that will be required to make one cubic feet of fresh concrete of 1:2:3 ratios? - Correct Answer 22 pounds, 41 pounds, 70 pounds" "What is the recommended wastage ratio considered for estimating the heavy weight reinforcing steel bars of #30 or above for a concrete construction project? - Correct Answer 3.3 percent" "What is the recommended ratio of wastage for formwork commonly used in the concrete construction industry? - Correct Answer 25 percent" "How many square inches are there in a square foot of area? - Correct Answer 144 square inches" "The drying shrinkage of concrete is independent of _____________in the concrete, as concrete dries up during the setting time. - Correct Answer Stress" "Which of the following tests are recommended by ASTM C94 standard to verify the quality of ready mixed concrete while pouring it in the structural forms? - Correct Answer Temperature Test, Air Content Test, Slump Test" "The ratio of cement, sand, aggregate, and water to prepare fresh/wet concrete is defined in terms of ________ not ________. - Correct Answer Weight & Volume" "Which of the following ratios of moisture is recommended in a soil or granular layer to achieve the best quality of compaction? - Correct Answer 12 percent" "Which of the following options is NOT a structural concrete element? - Correct Answer ALL -Statuary -Cornices -Corbels" "Which of the following pieces of equipment is commonly used for small project concrete floating to give a finished look? - Correct Answer Darby" "Which of the following statements is true about concrete swelling in humid or wet conditions? - Correct Answer Swelling takes longer periods , ranging from 6 to 12 months" "Which of the following problems will arise if you finish the concrete surface while water bleeding and surface sheen persist? - Correct Answer Scaling, Dusting, Blister" "What concrete expansion joint depth is recommended to control the plastic shrinkage cracks in concrete? - Correct Answer 1/4 of concrete thickness" "What is the maximum ratio of silica fume with respect to the cement of the concrete that generates a negligible effect on the setting time of the concrete? - Correct Answer Up to 10%" "Which of the following options is NOT related to the pre-placement concrete preparation activities? - Correct Answer Fill - back" "What is the recommended slump value for a normal reinforced cement concrete (RCC)? - Correct Answer 2" to 4"" "What is the minimum ratio of air entraining admixture recommended when working in a freeze-thaw climate? - Correct Answer 4 percent" "How much ratio of spillage should be expected while preparing the concrete to place in the desired forms? - Correct Answer 10 percent" "The metal ties installed in the form are normally cut at least _____________ below the finished surface of concrete. - Correct Answer 1 inch" "Which of the following types of concrete has the lowest drying shrinkage? - Correct Answer Metakaolin concrete mixture" "According to the American Concrete Institute (ACI) Committee, which of the following conditions are exempted from installing the vapor barriers in concrete structures? - Correct Answer ALL -When no drainage problem exists -When no soil problems exist -In the arid regions" "Which of the following 'productivity adjustment factors' for the earth work of sand/gravel soil should be taken while estimating the concrete project cost? - Correct Answer 0.94" "What should be done while removing false-work and concrete forms? - Correct Answer ALL -Left - holes of wire ties and other supports should be filled in properly -Honeycombed area should be properly patched -Prying, banging , and jarring should be avoided" "How many divisions are there in the Master Format Building standard information list? - Correct Answer 50 Divisions" "Petroleum base oil is commonly used as release oil for which of the following forms' making material? - Correct Answer Steel" "Which of the following weights should be supported by the false-work structure for concrete work? - Correct Answer Fresh concrete weight, Form weight, Equipment weight" "Which of the following methods are commonly used for concrete placement in the industry? - Correct Answer Concrete P ump, Mix Truck/Chute, Crane & Bucket" "What are two commonly used types of planking and strutting for excavation work on a concrete construction site? - Correct Answer Intermittent & c ontinuous" "Which of the following are the recommended dry stone (aggregate) sizes commonly used in the formation of concrete? - Correct Answer ½" to ¾"" "What are the standard sizes of column-base footings that form the foundation system of a concrete building? - Correct Answer 4.5 to 12 square feet" "What is the recommended depth of TROWELING around the form-edges for better edge finishing of the concrete once the concrete surface has dulled substantially? - Correct Answer About 1 inch" "Which of the following admixtures are commonly added to concrete to achieve better performance and quality of concrete? - Correct Answer ALL -Retarding admixture -Water reducing admixture -Air entertaining admixture" "Why are vapor or moisture barriers used in concrete construction? - Correct Answer To avoid flow - in of water moisture" "Which of the following factors can cause the greater cracks in the concrete? - Correct Answer ALL - Improper watering, High temperature, Premature loading -Rapid loading, Premature loading, Excessive loading -Improper reinforce, Poor curing, Poor compaction" "Which of the following statements is correct about placing a 3-inch-thick sand layer over the moisture barrier before placing the concrete? - Correct Answer ALL -Finishing time of concrete increases -Strength of the concrete increases -Fewer cracks develop" "What is the American Concrete Institute's recommended thickness of sand layer over the moisture barrier before placing the concrete on it? - Correct Answer 3 inches" "Which of the following problems may arise if you don't finish concrete edges round, neat, and properly? - Correct Answer Chipping" "What is the minimum depth of excavation that warrants shoring, bracing, and side slopes? - Correct Answer 5'" "Which of the following is the most commonly used moisture barrier material in the concrete industry? - Correct Answer Polyethylene" "What is the ratio of cement, sand, and aggregate respectively for a RICH mixture of concrete material? - Correct Answer 1:2:3" "Which of the following objectives are achieved by the SCREEDING process on a newly poured concrete slab? - Correct Answer Grading, Leveling, Consolidating" "Joint filers for expansion joints are commonly made from: - Correct Answer Bitumen, Cork strip, Pith" "How deep (below the surface level) is the backer rod (joint filer) commonly placed in the concrete expansion joints? - Correct Answer ½" below the surface" "How many more times does the in-flow of water vapor occur in the concrete without a moisture barrier than the concrete with a moisture barrier? - Correct Answer Three times" "Which of the following conditions will result in uneven settling and subsequently cracks in the concrete? - Correct Answer Uneven granule/soil compacting" "What is the ratio of wastage of lightweight rebar #10 commonly used while estimating the concrete construction project materials ? - Correct Answer 5.7 percent" "What are two commonly used standards for building construction and design in the industry? - Correct Answer Master Format & Uni F ormat Systems" "What is the size of well point pipe commonly used for dewatering an excavation and construction site? - Correct Answer 2.5"" "What is the 'Compaction factor' for sand/gravel soil to consider while estimating the excavation work for a concrete project? - Correct Answer 0.75 to 0.80" "Which of the following relationships holds good regarding the use of cement ratio in cold and hot climates? - Correct Answer Higher cement ratio is required in cold climate than in hot one" "Which of the following tests is commonly used to determine the initial and final setting time of concrete? - Correct Answer Penetrometer test" "Which of the following types of coarse aggregate will produce better strength in concrete formation? - Correct Answer Cubically shaped crushed stones with rough surfaces" "Form alignment is achieved with the help of: - Correct Answer Studs & Walers" "Which of the following pieces of equipment can be used to inject epoxy into cracks? - Correct Answer ALL -Paint Pressure Pots -Hydraulic Pumps -Caulking guns" "How many methods for barrier installation are used before placing the concrete on a structure? - Correct Answer 3 Explanation: There are three types of installation methods for vapor barriers as given below: Polyethylene barrier direct in contact with concrete placement Polyethylene barrier with a sand layer between concrete placement Polyethylene barrier with a stone layer between concrete placement"