CSLB CONCRETE C8 LICENSE PRACTICE TEST 2 NEWEST 2025 EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!

CSLB CONCRETE C8 LICENSE PRACTICE TEST 2 NEWEST 2025 EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW! The maximum size of the conduit or pipe shall NOT exceed _______ of the thickness of the concrete. - Correct Answer 1/3" "Which of the following tests for concrete is conducted at the site/field? - Correct Answer Color Test Explanation: Rest of the above are laboratory tests." "Which of the following factor influence the positioning of the joints in a slab on grade? - Correct Answer ALL OF THESE -Sub grade conditions -Finishing requirements -Temperature" "Which of the following is NOT a property of concrete? - Correct Answer High tensile strength" "The concrete work is done in freezing zones, it gets cured by ______________. - Correct Answer Steam Explanation: It is done by heating concrete by steam or using alternating current, so that water content in the concrete is not increased." "What type of aggregate is formed by crushing, sizing, screening an existing hardened concrete surface or structure? - Correct Answer Recycled aggregate" "The concrete paving operations includes: - Correct Answer ALL OF THESE! -Preparation of sub grade -Specified equipment -Construction of joints" "If the concrete compressive strength specified is less than 3600 psi, it has the option of being tested at 28 days and is able to accept the concrete if it attains ___________ percentage of the minimum required strength. - Correct Answer 85" "If the admixtures are used in concrete for the purpose of delayed setting and hardening of concrete, they are called _____________? - Correct Answer Retarders" "Which of the following are the general types of vibrating needles that are in use? - Correct Answer ALL ANSWERS! -Internal vibrators -Immersion vibrators -Surface vibrators" "Concrete proportioning is done based on the facilities available at the site. Which are the general proportioning methods used for concrete? - Correct Answer ALL OF THESE -Surface area method -Mix design based on flexural strength -Maximum destiny method" "The minimum cementitious material that is required for concrete bridging deck is ______________lbs/cu yd. - Correct Answer 675" "The amount of free water used in concrete shall not exceed ____________ pounds per cubic yard of concrete. - Correct Answer 310 Explanation: If the SCM are added, it can be increased to 20 pounds per each required 100 pounds of cementitious material in excess of 550 pounds per cubic yard." "If the concrete curbs are to be constructed over the existing pavement, _______________ are used to fix them to pavement. - Correct Answer Steel dowels" "Which of the following is NOT an example of blended cement? - Correct Answer Combination of silica fume and chlorine fluoride Explanation: Blended cement is a combination of either Type || or Type V cement with any of the SCM" "Which of the following is a line at which the face of the curb meets the top of the payment? - Correct Answer Control Joint" "Which of the following is NOT used as concrete chemicals? - Correct Answer Abrasion bonding compound Explanation: Concrete curing compound and polymer bonding agent are both concrete chemicals." "The admixtures that are used in concrete to improve durability in freeze/thaw environments are ________________. - Correct Answer Air entrainment admixtures" "The fly ash which is used as SCM has the specific gravity ___________________. - Correct Answer 1.9 - 2.8" "The leveling operation that removes lumps and hollows and provides a true and uniform concrete surface is called ______________________. - Correct Answer Screeding" "If the quantity of concrete is less than _____________ cubic yards, the compliance test reports are not required. - Correct Answer 50" "Which type of Portland cement is used when early strength is expected? - Correct Answer Type |||" "Coarse aggregate in concrete is the material that is retained in sieve number ____________. - Correct Answer #4 Explanation: The one which passes through sieve #4 is the fine aggregate." "All of the structural steel is considered satisfactory even if it is rusted, but still meets the density requirements, except ___________________. - Correct Answer Pre stressing steel Explanation: If the pre stressing steel is rusted, it cannot be used since it does not meet the compliance requirements." "The compressive strength of concrete when treated with a 4" cube is always ____________ than when tested with a 6" cube. - Correct Answer More" "The practice of making concrete to achieve the stipulated minimum strength and durability and to make concrete in the best economical manner is called _________________. - Correct Answer Mix design Explanation: Mix design uses the theoretical calculations to get the desired higher strength in concrete but yet consuming minimum cement." "What is the purpose of using SCM in concrete other than meeting workability requirements? - Correct Answer To avoid emissions: The cement production is responsible for 7% of the greenhouse gas emissions (GHG)." "What is the reason for setting the minimum compressive strength as 2500 psi? - Correct Answer ALL OF THESE! -Lower volume of Portland cement -Higher volume of SCM -Minimum compressive strength is required" "Mix design of concrete has the following proportion: - Correct Answer None of the above Explanation: Mix design is done based on the strength requirements and with theoretical calculations. The given options belong to concrete for general purposes." "In which of the following ways listed is the minor concrete different from the general concrete? - Correct Answer ALL OF THESE! -Less cementitious material -Recycled aggregate use -Use of Rice Hull Ash (ASH) Explanation: These are not allowed in general concrete" "If the contractor has to transport the concrete, what is the specified time for the concrete after catching under normal circumstances? - Correct Answer Before 1 1/2 hours Explanation: Or before 250 revolutions of the drum" "What is NOT a key purpose in using SCM in concrete? - Correct Answer Short term curing period" "The rough concrete finishes are generally appropriate for surfaces subject to _______________. - Correct Answer Traction" "Why would the cylindrical/circular columns be chosen over the square/rectangular columns? - Correct Answer Circular columns carry more load. Explanation: For the given cross section area, circular columns carry more load as compared to square/rectangular columns." "The size of the vibration needle to be used for concrete vibration for slab is ______________ inch. - Correct Answer 3/4" (20mm) Explanation: It is based on the thickness of the slab, generally 3/4" needle is used and in rare cases 1 1/2" needle is also used." "What are the compliance requirements that the concrete must meet to pass the acceptance test? - Correct Answer ALL OF THESE! -Homogeneity -Strength -Workability" "The additives used to enhance the performance of concrete for the special purposes is/are called: - Correct Answer Chemicals Explanation: Shall not be confused with admixtures" "Which of the following are the factors that affect the pulse velocity measurement on concrete? - Correct Answer ALL OF THESE! Explanation: -Temperature on concrete -Presence of reinforcing steel -Smoothness of the surface" "Which of the following is NOT a concrete curing method? - Correct Answer Water entrapment curing" ""Specific performance admixtures" are the admixtures that can provide a desired performance characteristics other than: - Correct Answer ALL OF THESE -Reducing water content -Changing the setting time -Changing the functionality" "Construction joints in the pavement are generally created by ___________________. - Correct Answer ALL OF THESE! -Scoring concrete with a grooving tool -Rounding corners with the edger tools -Saw cutting the hard concrete" "The average of the expansion of the aggregate at 16 days when tested in conformance with the requirements is less than or equal to ____________ percent. - Correct Answer .15 Explanation: For one year and less the expansion limit is .040 percent" "The cement type that is recommended for rapid construction or cold weather is __________________. - Correct Answer Type |||" "According to Caltrans recommendations, air entraining admixtures are used in concrete in the climate zone _______________. - Correct Answer ||| Explanation: Area ||| is classified as a severe climate, where freeze-thaw cycles and heavy salting occurs frequently and where chains are used." "What is the minimum depth of excavation for the curbs below the sub grade? - Correct Answer 6"" "In locations where fine aggregate is expensive or scarce, what can be used as an economical partial replacement? - Correct Answer Air entraining admixtures Explanation: This is the air bubble that expands to reduce the requirements of fine aggregates, it also enhances the workability of fresh concrete and in turn reduces the water requirements." "The activities carried out during concreting include but are not limited to: - Correct Answer ALL OF THESE! -Batching -Placing -Compacting Explanation: In addition it includes mixing, transporting, curing etc." "The function / value of the poissons ratio generally ___________________ with concrete mixing. - Correct Answer Increases Explanation: Richer the mix, higher the value" "The minimum level at which the aggregates being tested is expected to comply, is referred to as - Correct Answer Threshold" "Which of the following tools will be used to finish concrete that requires a dense and smooth finish? - Correct Answer Steel trowel" "The cement type that is recommended for precast concrete elements is ____________________. - Correct Answer Type |" "For most of the work, concrete is proportioned with batching. If an error is reported in batching, it is related to __________________. - Correct Answer ALL OF THESE! -Cement -Fine aggregate -Coarse aggregate" "Hope is the water content managed during the concrete placement? - Correct Answer BOTH OF THESE! -By ball penetration test -By slump test It depends on the workability of the concrete. If the penetration result is = 3 inches, penetration test is applicable, if the result is more than 3", slump test is applicable" "As per the classification, all the chemical admixtures fall under ASTM designation _________. - Correct Answer C494" "The most common admixtures used as a retarder is _____________. - Correct Answer Gypsum" "How much concrete is required to pour a volume of 15' x 30' x 1.5'? - Correct Answer 25cu yds" "The KEY differences between binary and ternary mixes is ________________. - Correct Answer Number of SCM used Explanation: The only difference between a binary and ternary mix in the number of cementitious materials, including cement, are used. Binary mix have two and ternary mix has three cementitious material." "What is/are the example(s) of the pozzolan materials used for pozzolana cement? - Correct Answer ALL OF THESE! -Silica fume -Fly ash -Rice hull ash" "Which of the following factors must be considered while concreting in hot weather in order to ensure the concrete strength is protected? - Correct Answer ALL OF THES -Ingredients -Placing -Curing" "Which of the following techniques are used for measuring pulse velocity through concrete? - Correct Answer ALL OF THESE! -Direct transmission -Indirect transmission -Surface transmission" "If the concrete surface requires frequent cleaning, or the concrete surface is to be used as flooring, it shall have a __________________ finish. - Correct Answer Smooth" "The property of concrete by which it can be mixed, transported and placed in position with ease is referred as ____________________. - Correct Answer Workability" "Shrinkage test is conducted to check the ________________ of the concrete. - Correct Answer Cracking" "What could be the result from over vibration while pouring the concrete? - Correct Answer Segregation" "If the concrete is planned for a stepped footing with the size 4' x 4' and 3' x 3' with a thickness of 8" for each step. Calculate the concrete quantity - Correct Answer 16.57" "What is the compliance requirements that the contractor needs to meet before the commencement of the concrete job - Correct Answer ALL OF THESE! -Mix design report -Shrinkage test report -Material compliance report" "If a new slab is to be added or joined to an existing one, which of the following will happen if the new work bleeds during concreting. - Correct Answer The surface will develop cracks" "In general, how is the final setting of concrete affected by adding SCMs? - Correct Answer It remains the same" "What is the non-destructive testing method(s) used in concrete? - Correct Answer BOTH OF THESE! -Rebound Hamner test method -Pulse velocity method" "When concrete batching is being performed, all required water for the batch should be added ____________________. - Correct Answer At a time (All at once)" "Concrete surfaces which are frequently subject to freezing and thawing, should NOT have _________________ finishing. - Correct Answer Splattered Explanation: This finish will peel and spall." "If the concrete to be poured is 150cu ft, within a mix proportion of 1:2:4, what is the quantity of the fine aggregate (sand) required? - Correct Answer 42.85cu ft Explanation: 1:2:4 = 1 part cement, 2 part sand, 4 part coarse aggregate" "Which of the following is/are special types of cement? - Correct Answer ALL OF THESE! -High Alumina Cement -Expanding cement -Acid-resistance cement" "The concrete which is designated by compressive strength, has strength greater than _________________ psi at 42 days. - Correct Answer 3600" "If the surface of the concrete is subject to frequent regular traffic, then is shall be given a _____________ finish. - Correct Answer Evenly grooved (Floated)" "What chemical admixtures allow for a reduction in the amount of water required to produce concrete with a certain slump. - Correct Answer Water reducing admixtures" "The maximum specified cover for the concrete using bundle bars, shall be ___________ inches or the equivalent diameter of the bundle, whichever is minimum. - Correct Answer 2"" "What type of cement is recommended for heavy concreting like dams, bridge foundations etc., (mass concreting)? - Correct Answer Low heat cement Explanation: Low heat cement is used to avoid excess heat creation and cracking of concrete." "A concrete slab spans 15' x 12' x 4". The slab has a 3' x 3' sunlight cut out in the center. How much concrete will be required? - Correct Answer 2 1/4cu yds" "Before the concrete pavement begins, which of the following needs more attention? - Correct Answer Tie bar detailing Explanation: As reinforcement work typically differs in pavement works, tie bar detailing needs more attention than the other listed options." "The KEY advantage of reinforced concrete among the following is ______________________. - Correct Answer Can be moulded to any shape Explanation: Though all the options are correct, key advantage is that reinforced concrete can be moulded to any desired shape/size."