CSLB Concrete C8 License Practice Test #2. Questions and answers. Latest updates

CSLB Concrete C8 License Practice Test #2. Questions and answers. Latest updates The maximum size of the conduit or pipe shall NOT exceed _______ of the thickness of the concrete. - ✔✔1/3 Which of the following te ...

CSLB Concrete C8 License Practice Test #2. Questions and answers. Latest updates The maximum size of the conduit or pipe shall NOT exceed _______ of the thickness of the concrete. - ✔✔1/3 Which of the following tests for concrete is conducted at the site/field? - ✔✔Color Test Explanation: Rest of the above are laboratory tests. 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. - ✔✔85 If the admixtures are used in concrete for the purpose of delayed setting and hardening of concrete, they are called _____________? - ✔✔Retarders Which of the following are the general types of vibrating needles that are in use? - ✔✔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? - ✔✔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. - ✔✔675 The amount of free water used in concrete shall not exceed ____________ pounds per cubic yard of concrete. - ✔✔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. - ✔✔Steel dowels Which of the following is NOT an example of blended cement? - ✔✔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? - ✔✔Control Joint Which of the following is NOT used as concrete chemicals? - ✔✔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 ________________. - ✔✔Air entrainment admixtures The fly ash which is used as SCM has the specific gravity ___________________. - ✔✔1.9 - 2.8 The leveling operation that removes lumps and hollows and provides a true and uniform concrete surface is called ______________________. - ✔✔Screeding If the quantity of concrete is less than _____________ cubic yards, the compliance test reports are not required. - ✔✔50 Which type of Portland cement is used when early strength is expected? - ✔✔Type ||| Which of the following factor influence the positioning of the joints in a slab on grade? - ✔✔ALL OF THESE -Sub grade conditions -Finishing requirements -Temperature Which of the following is NOT a property of concrete? - ✔✔High tensile strength The concrete work is done in freezing zones, it gets cured by ______________. - ✔✔Steam Explanation: It is done by heating concrete by steam or using alternating current, so that water content in the concrete is not increased. Coarse aggregate in concrete is the material that is retained in sieve number ____________. - ✔✔#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 ___________________. - ✔✔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. - ✔✔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 _________________. - ✔✔Mix design