CSLB Concrete C-8 License 2 Practice Exam

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• Which statement about fiber reinforcement in concrete is accurate?
• What is Type II Portland cement used for?
• In locations where fine aggregate is expensive or scarce, what can be used as an economical partial replacement?
• What is the typical minimum spacing between parallel reinforcing bars?
• What is a primary purpose of using supplementary cementitious materials in concrete besides meeting workability requirements?
• Which activities are carried out during concreting?
• Pozzolanic materials react with calcium hydroxide to form cementitious compounds.
• What is the minimum depth of excavation for the curbs below the sub grade?
• If a bonding agent is not used during concrete repairs, what is a likely consequence?
• Which statement best describes how proper aggregate gradation affects concrete performance?
• Blended cement is a combination of Type II or Type V cement with any of the SCM. Which of the following best reflects this statement?
• Which statement about supplementary cementitious materials (SCM) is true according to the given data?
• Which finishing operation is used to produce a level surface before final finishing?
• Why is proper subgrade drainage important for slabs on grade?
• Which finishing sequence is commonly used for interior slabs to achieve a smooth surface?
• Specific performance admixtures are the admixtures that can provide a desired performance characteristics other than:
• If the concrete surface requires frequent cleaning, or the concrete surface is to be used as flooring, it shall have a ______ finish.
• Which surface outcome is expected specifically when the new slab bleeds during placement and is connected to an existing slab?
• In concrete, coarse aggregate is the material retained on which sieve number?
• Which tool is used to finish concrete that requires a dense and smooth finish?
• What is the purpose of a vapor retarder under a slab-on-grade?
• A concrete mix that uses two cementitious materials is called which?
• The key advantage of reinforced concrete among the following is:
• What is the function of plasticizers in concrete?
• What is the primary purpose of curing concrete?
• Rough concrete finishes are generally appropriate for surfaces subject to which condition?
• 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.
• What is the compliance requirements that the contractor needs to meet before the commencement of the concrete job
• How does the Poisson's ratio generally change with concrete mixing?
• What is a likely consequence of improper curing on surface quality?
• Which cement type is typically used for rapid construction or cold weather?
• How should curing affect the final finish of interior concrete floors?
• Concrete proportioning is done based on the facilities available at the site. Which are the general proportioning methods used for concrete?
• The additives used to enhance the performance of concrete for special purposes are called:
• If the quantity of concrete is less than ______ cubic yards, the compliance test reports are not required?
• The amount of free water used in concrete shall not exceed ____________ pounds per cubic yard of concrete.
• 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.
• Which factor most directly contributes to reducing voids in a concrete mix?
• What is the purpose of curing blankets?
• Which statement best describes the influence of proper subgrade drainage on slab performance?
• The concrete mix designated by compressive strength has a 42-day strength greater than how many psi?
• Which admixture is used to improve durability in freeze-thaw environments?
• What is the difference between a control joint and an isolation joint?
• Which preparation step is essential before applying a bonding agent to an existing concrete surface?
• What is a primary benefit of proper aggregate gradation in concrete?
• Which of the following is NOT a concrete curing method?
• During construction, when a new slab bonds to an existing slab and bleeding occurs, what surface condition is anticipated?
• Which test is commonly used to determine the air content of fresh concrete?
• If an error is reported in batching, it is related to which of the following?
• Which of the following are pozzolanic materials used for pozzolana cement?
• In non-freeze environments, what is a potential drawback of using air-entraining admixtures on concrete strength?
• In concrete mix design, what primarily determines the proportion of ingredients according to the material?
• What is the typical method to test concrete compressive strength at 28 days?
• The compressive strength of concrete tested with a 4-inch cube is always which relation to testing with a 6-inch cube?
• In freezing zones, concrete is cured by which method?
• If the water-cement ratio is too high, which is a likely consequence?
• In a 1:2:4 mix by volume, which component has the largest proportion?
• Which joint type is used to control cracking in slabs?
• What is the most common admixture used as a retarder?
• If bleeding happens while pouring a new slab that ties into an existing slab, which condition describes the surface outcome most likely?
• How much concrete is required to pour a volume of 15' x 30' x 1.5'?
• What is bleed water in fresh concrete?
• Why would circular columns be chosen over square or rectangular columns?
• Besides increasing strength, what is another benefit of proper aggregate gradation?
• In a 1:2:4 mix by volume, which component corresponds to the 2-part proportion?
• Why is 28-day strength commonly used in concrete design?
• Which statement describes a key benefit of fly ash in concrete?
• During batching, when should all required water for the batch be added?
• The minimum cementitious material for bridging deck is expressed in which unit?
• When a new slab is poured and joined to an existing slab, bleeding occurs. What surface effect is expected?
• Concrete surfaces that are frequently subjected to freezing and thawing should NOT have which finishing?
• What is the typical needle size for vibrating concrete in slabs?
• What is the typical minimum concrete cover to reinforcement for exterior slabs in moderate exposure?
• Why are air-entraining admixtures used in concrete?
• Which factor influences the positioning of the joints in a slab on grade?
• Air entraining admixtures create air voids that do which of the following?
• For the same cross-sectional area, which column shape typically carries more load?
• Which admixtures improve durability in freeze-thaw environments?
• Which test for concrete is conducted at the site/field?
• Water content during placement is assessed using ball penetration and slump tests depending on workability. Which option best reflects this?
• Curing compounds are used to
• Which of the following is a line at which the face of the curb meets the top of the payment?
• Which non-destructive method uses a hammer to estimate the surface hardness of concrete?
• Why is the minimum compressive strength set at 2500 psi?
• In the scenario of a new slab connected to an existing slab with bleed, which surface condition is anticipated?
• Which aggregate passes through sieve #4?
• During concreting of a newly added slab joined to an old slab, what is the surface expectation if bleeding occurs?
• Which component is primarily responsible for improving concrete's ductility and tensile strength?
• If the fresh concrete in a newly added slab bleeds during placement and connects to an existing slab, which surface result is expected?
• What is the typical 28-day strength used for design in many residential slabs?
• Which factors influence the rate of strength gain in early-age concrete?
• If bleeding occurs when adding a new slab and it is joined to an older slab, which surface condition is expected?
• In non-freeze environments, what is a possible effect of using air-entraining admixtures on concrete strength?
• Which sealants are commonly used for expansion and control joints in slabs?
• Which statement best explains the effect of curing on concrete hydration?
• Which type of cement is used for heavy mass concreting such as dams and bridge foundations?
• Which cement type is commonly used to reduce heat of hydration in large pours?
• Low heat cement is used to avoid what problem in mass concreting?
• Air entraining admixtures improve workability and have what effect on water requirements?
• In slab vibration, which size may be used in rare cases besides the typical 3/4 inch needle?
• Which finishing step yields a smooth, dense surface after floating?
• What effect does a splattered finish have on concrete surfaces exposed to freezing and thawing?
• What is an isolation joint?
• If the admixtures are used in concrete for the purpose of delayed setting and hardening of concrete, they are called _____________?
• How should joints be treated to prevent water intrusion in slabs?
• The cement type that is recommended for rapid construction or cold weather is __________________.
• The key difference between binary and ternary mixes is which factor?
• Construction joints in pavement are generally created by which methods?
• Which of the following are considered special types of cement?
• Which item is included in pre-construction compliance before concrete work?
• Shrinkage test is conducted to check the ______ of the concrete.
• According to Caltrans recommendations, air entraining admixtures are used in concrete in the climate zone _______________.
• What is the main difference between normal-weight and lightweight concrete?
• Which option is a concrete chemical used for bonding between cement paste and aggregate?
• Which type of admixtures allow for a reduction in the amount of water required to produce concrete with a given slump?
• The minimum cementitious material that is required for concrete bridging deck is ______________lbs/cu yd.
• Which statement is NOT a key purpose of using SCM in concrete?
• Besides using Type II cement, what is another method to manage heat of hydration in large pours?
• In a concrete pour where a new slab bonds to an existing slab and there is bleed, which surface outcome is expected?
• The minimum level at which the aggregates being tested is expected to comply is referred to as what?
• What is the purpose of expansion joints in concrete slabs?
• What could be the result from over vibration while pouring the concrete?
• Bleeding during the concreting of a new slab joined to an existing slab leads to which surface condition?
• Which statement best describes the role of fly ash as a supplementary cementitious material?
• Water content management during placement is determined by which tests?
• Which of the following is a typical reason for surface scaling on exterior concrete?
• What is the typical function of fiber reinforcement in concrete?
• As per the classification, all chemical admixtures fall under ASTM designation _________.
• What does a slump test measure?
• Which of the following is NOT a pozzolanic material?
• If 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.
• The fly ash used as SCM has the specific gravity within which range?
• Which of the following is NOT a property of concrete?
• What is a common direct consequence of inadequate subgrade drainage for slabs on grade?
• What is the purpose of a bond breaker when forming joints or patches?
• Which statement about cement hydration is true?
• How does increasing the water-cement ratio affect concrete strength and durability?
• Without a vapor retarder under a slab, which outcome is most likely?
• Which of the following are factors that affect the pulse velocity measurement on concrete?
• What is a consequence of poor consolidation during placement?
• Which material is commonly used as a pozzolanic additive in cement?
• What is the main function of reinforcing steel in concrete?
• Air-entraining admixtures are used to improve freeze-thaw durability and what else?
• If the concrete curbs are to be constructed over the existing pavement, _______________ are used to fix them to pavement.
• What does curing help concrete to develop more effectively?
• SCM stands for what in concrete technology?
• Which of the following is NOT an example of blended cement?
• Which testing approaches are used for measuring pulse velocity through concrete?
• Which term describes the process of designing concrete to achieve the required strength and durability in the most economical manner?
• The concrete paving operations include which of the following?
• Air voids in concrete can reduce the requirements of which component?
• Which statement is true about a ternary concrete mix?
• In general, how is the final setting of concrete affected by adding SCMs?
• Which of the following best describes the rationale for setting the 2500 psi minimum compressive strength?
• How do you bond new concrete to an existing hardened surface?
• For transporting concrete under normal circumstances, what is the specified time before placement after batching?
• How do you minimize plastic shrinkage cracks in hot, windy conditions?
• When a new slab is added and bleeds during placement, and it is joined to an older slab, what is the predicted surface outcome?
• Which non-destructive testing method(s) are used for concrete?
• Which joint is designed to crack along a line?
• What type of aggregate is formed by crushing, sizing, screening an existing hardened concrete surface or structure?
• Which cement type is recommended for precast concrete elements?
• If prestressing steel is rusted, what is the consequence?
• At 16 days, the aggregate expansion limit is 0.15 percent. What is the expansion limit for one year or less?
• What is a typical effect of high heat of hydration in large pours?
• When attaching a freshly poured slab to a previously constructed one and bleed occurs, what is the expected surface behavior?
• Which finish is common for exterior slabs to provide slip resistance?
• What is the typical unit weight of normal-weight concrete?
• Which statement best describes batching in concrete?
• Which type of Portland cement is used when early strength is expected?
• What is the purpose of form release agents?
• Which of the following are the general types of vibrating needles in use?
• Curing methods primarily aim to maintain which conditions after concrete placement?
• Name two common curing methods.
• Construction joints in the pavement are generally created by ___________________.
• Which of the following is NOT used as concrete chemicals?
• What is the primary function of cement in concrete?
• All structural steel is considered satisfactory even if rusted, as long as density requirements are met, except which type?
• In hot weather concreting, which factors must be considered to ensure the concrete strength is protected?
• In joining a new slab to an older slab, if the new work bleeds during pouring, what surface outcome should be anticipated?
• In the context of cement blends, which statement is true about the relationship between cement type and SCM in blended cement?
• What standard test is used to measure the compressive strength of concrete cylinders?
• What is the difference between a trowel finish and a float finish?
• When a new slab is added or joined to an existing slab, and the new work bleeds during concreting, what will happen to the surface?
• In concrete terminology, what term is used for substances added to concrete to achieve specific performance outcomes and should not be confused with standard admixtures?
• For a concrete surface that will experience frequent heavy traffic, which finish is recommended?
• What is the purpose of a bonding agent in concrete repair?
• Which climate zone is described as severe climate with frequent freeze-thaw cycles and heavy salting?
• Bleeding during concreting of a newly placed slab connected to an existing slab will cause which surface condition?
• 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
• Why is a concrete vibrator used during placement?
• The leveling operation that removes lumps and hollows and provides a true and uniform concrete surface is called what?
• In a batch of 150 cubic feet with a mix ratio of 1:2:4 (cement:sand:coarse aggregate by volume), how many cubic feet of sand are required?
• The maximum specified cover for bundle bars is 2 inches or the equivalent diameter of the bundle, whichever is minimum. Which option best expresses this rule?
• What is the role of control joints?
• Before the concrete pavement begins, which of the following needs more attention?
• In mix design, which approach is used to achieve higher strength while consuming minimum cement?
• Which statement best explains tie bars in pavement reinforcement?
• What is the common risk of using de-icing salts on concrete with embedded reinforcement?
• Which statement best describes how minor concrete differs from general concrete?
• What is a potential effect if bleed water is not managed before finishing?
• What is the recommended temperature range for placing concrete in moderate climates?
• Which non-destructive method measures the speed of ultrasonic waves through concrete?
• The maximum size of conduit or pipe shall NOT exceed _______ of the thickness of the concrete.
• A concrete slab spans 15 feet by 12 feet with a thickness of 4 inches. It includes a central cutout of 3 feet by 3 feet. How much concrete is required in cubic yards?
• Which of the following are compliance requirements that the concrete must meet to pass the acceptance test?
• What is the effect of fly ash or slag as supplementary cementitious materials?
• Which factor is not listed as influencing early-age strength?
• The property of concrete by which it can be mixed, transported and placed in position with ease is referred to as ______.
• What is the maximum specified cover for bundle bars in concrete?