In Item 405 – Structural Concrete, production requirement, admixtures shall have an accuracy of batching within plus (+) or minus(-) ___ percent, 0.5, 1, 3, 2, Structural concrete type A shall have a slump range of ____ mm, 100 max, 50 max, 50-100, 100-200, In Item 407, for formworks construction, forms for exposed surfaces shall be constructed with triangular fillets at least ____ wide attached so as to prevent mortar runs and to produce smooth straight chamfers at all sharp edges of the concrete, 30 mm, 20 mm, 40 mm, 10 mm, In Item 405 – Structural Concrete, as work progresses, at least one (1) sample consisting of three (3) concrete cylinder test specimens, shall be taken from each ____ cubic meters of each class of concrete, 50, 100, 25, 75, Structural concrete type C shall have a designated size of coarse aggregate of ______, 0.5" to No. 4, 2.0" to No. 4, 1.0" to No. 4, 1.5" to No. 4, In Item 405 – Structural Concrete, a change in the source of materials during the progress of work ___________, may necessitate a new mix design, shall not be allowed, None of the above, will required the same mix design, In Item 405 – Structural Concrete, production requirement, Mixer having a rated capacity of less than a ____ batch shall not be used, two-bag, one-bag, three-bag, four-bag, In Item 405 – Structural Concrete, production requirement, water shall have an accuracy of batching within plus (+) or minus(-) ___ mass percent, two-bag, one-bag, three-bag, four-bag, In Item 405 – Structural Concrete, production requirement, water shall have an accuracy of batching within plus (+) or minus(-) ___ mass percent, 0.75, 0.5, 2, 1, In Item 407, no falsework for bridges shall be released until the supported concrete has attained a compressive strength of at least _____ of the required 28-day strength, 90%, 100%, 80%, 70%, Structural concrete – Seal shall have a slump range of ____ mm, 100-200, None of the above, 100 max, 50-100, In Item 405 – Structural Concrete, production requirement, when a truck mixer or agitator is used for transporting concrete to the delivery point, discharge shall be completed within ___ hour/s, or before 250 revolutions of the drum or blades, 2, 2.5, 1, 1.5, In Item 407, when concrete strength tests are used for removal of forms and supports, such removal should not begin until the concrete has attained the percentage of the specified design strength. For Floor slabs, a minimum time of ____ shall passed before the removal of its formworks., 1 day, 14 days, 7 days, 2 days, Which of the following is NOT the type of concrete surface finishing in Item 407 – Concrete Structures?, Shiny Finish, Floated Finish, Ordinary Finish, Rubbed Finished, Class of structural concrete intended for thin reinforced sections, railings, precast R.C. piles, Class P, Class A, Class B, Class C, Structural concrete type A shall require ___ bags of cement (40kg/bag) per cubic meter of concrete., 11, 9.1, 8, 9.5, Item 407, Casting Columns, the load of the super-structure shall not be allowed to come upon the bents until they have been in place at least ____ days, 21, 14, 28, 7, Structural concrete type B shall have a minimum compressive strength of ____ MPa (at 28 days), 28.2, 20.7, 16.5, 37.7, Structural concrete type A shall have a maximum water/cement ratio of ______, 0.55, 0.53, 0.58, 0.49, In Item 407, when concrete strength tests are used for removal of forms and supports, such removal should not begin until the concrete has attained the percentage of the specified design strength. For columns, a minimum percentage design strength of ____ shall be attained before the removal of formworks., 100%, 70%, 80%, 90%, In Item 407, curing concrete using forms-in-place method, the forms shall remain in place for a minimum period of ___ days after the concrete has been placed, 9, 7, 5, 10, Structural concrete type C shall require ___ bags of cement (40kg/bag) per cubic meter of concrete., 9.5, 8, 9.1, 11, In Item 407, when concrete strength tests are used for removal of forms and supports, such removal should not begin until the concrete has attained the percentage of the specified design strength. For columns, a minimum time of ____ shall passed before the removal of its formworks., 2 days, 10 days, 5 days, 7 days, Structural concrete type P shall require ___ bags of cement (40kg/bag) per cubic meter of concrete., 8, 9.1, 9.5, 11, In Item 407, curing pre-cast concrete using steam curing, during application of the steam, the temperature rise within the enclosure shall not exceed ____ per hour., 20°C, 45°C, 65°C, 30°C, In Item 405 – Structural Concrete, production requirement, the intervals between delivery of batches shall not be so great as to allow the concrete inplace to harden partially, and in no case shall such an interval exceed _____ mins, 20, 40, 30, 10, In Item 405 – Structural Concrete, production requirement, for mixers having a capacity greater than 1.5 m^3, the mixing time shall not be less than ____ seconds, 60, 120, 90, 75, Class of structural concrete intended for prestressed concrete structures and members, Seal, Class A, Class B, Class P, In Item 405 – Structural Concrete, production requirement, mixing time shall not be less than _____ seconds for mixers having a capacity of 1.5 m^3 or less, 75, 120, 90, 60, In Item 407, curing concrete using waterproof membrane method, it shall remain in place for a period of not less than ____ hours., 48, 72, 24, 96, In Item 407, when concrete strength tests are used for removal of forms and supports, such removal should not begin until the concrete has attained the percentage of the specified design strength. For walls, a minimum percentage design strength of ____ shall be attained before the removal of formworks., 70%, 80%, 90%, 60%, Class of structural concrete intended for footings, pedestals, massive pier shafts, Class P, Class B, Class A, Class C, Item 407, Casting of Slabs and Girders, when placing concrete in two separate operations, bond between stem and slab shall be secured by means of suitable shear keys which may be formed by the use of timber blocks approximately _______ in cross-section, 25 mm x 50 mm, 50 mm x 100 mm, 25 mm x 75 mm, 50 mm x 75 mm, In Item 405 – Structural Concrete, production requirement, Portland cement shall have an accuracy of batching within plus (+) or minus(-) ___ mass percent, 1, 2, 0.5, 3, Structural concrete type C shall have a maximum water/cement ratio of ______, 0.55, 0.58, 0.53, 0.49, When placing operations would involve dropping the concrete more than ____ m, concrete shall be conveyed through sheet metal or approved pipes, 1.5, 3.0, 2.0, 1.0, In Item 407, curing pre-cast concrete using steam curing, the curing temperature throughout the enclosure shall not exceed, 65°C, 55°C, 45°C, 35°C, In Item 407, curing concrete using curing compound, it shall be applied with a pressure spray in such a manner as to cover the entire concrete surface with a uniform film and shall be of such character that it will harden within ____ minutes after application., 30, 20, 40, 10, In Item 407, when concrete strength tests are used for removal of forms and supports, such removal should not begin until the concrete has attained the percentage of the specified design strength. For walls, a minimum time of ____ shall passed before the removal of its formworks., 3 days, 7 days, 1 day, 10 days, Structural concrete – Seal shall require ___ bags of cement (40kg/bag) per cubic meter of concrete., 11, 8, 9.5, 9.1, Structural concrete type A shall have a minimum compressive strength of ____ MPa (at 28 days), 28.2, 16.5, 37.7, 20.7, In Item 405 – Structural Concrete, production requirement, truck mixing speed shall not be less than ____ rpm, nor more than ____ rpm, 4 & 8 respectively, 5 & 8 respectively, 5 & 6 respectively, 4 & 6 respectively, Class of structural concrete intended for concrete deposited in water, Class A, Class P, Class C, Seal, Item 407, Placing Concrete by Pneumatic Means, the discharge end of the line shall not be more than ____ from the point of deposit, 1 m, 3 m, 2 m, 4 m, Structural concrete type Seal shall have a maximum water/cement ratio of ______, 0.58, 0.49, 0.55, 0.53, In Item 405 – Structural Concrete, production requirement, truck mixing shall not be less than ___ revolutions after all ingredients, including water, are in the drum, 300, 400, 100, 200, Item 407, Placing Concrete by Pneumatic Means, discharge lines shall be ______ from the machine, either horizontal or inclined upwards, inclined upwards, horizontal, vertical, Structural concrete type P shall have a maximum water/cement ratio of ______, 0.58, 0.53, 0.55, 0.49, In Item 407, falsework supporting deck overhangs and deck slabs between girders shall not be released until ___ days after the deck concrete has been placed, 28, 7, 14, 21, In Item 407, curing concrete using curing compound, should the film of compound be damaged from any cause before the expiration of ___ after the concrete is placed in the case of structures, the damaged portion shall be repaired immediately with additional compound., 7 days, 5 days, 10 days, 12 days, In Item 407, curing concrete using water method, concrete shall be kept continuously wet by the application of water for a minimum period of ___ after the concrete has been placed, 14 days, 10 days, 7 days, 12 days, In Item 405 – Structural Concrete, as work progresses, at least one (1) sample consisting of three (3) concrete cylinder test specimens, ______ shall be taken from every volume of concrete., 150 x 300 mm, 200 x 400 mm, 150 x 400 mm, 200 x 300 mm, Class of structural concrete intended for all superstructures and heavily reinforced substructures, Class B, Class P, Class A, Class C, In Item 405 – Structural Concrete, production requirement, aggregates shall be conducted within ____ mass percent maximum tolerance for the required materials, 1, 2, 0.5, 3, Item 407, Placing Concrete in Water, a tremie shall consist of a tube having a diameter of not less than ____ constructed in sections having flanged couplings fitted with gaskets with a hopper at the top, 250 mm, 450 mm, 350 mm, 150 mm, For Pre-cast concrete, members shall be held for a minimum ___ hour/s pre-steaming period, 7, 4, 2, 3, Structural concrete type P shall have a minimum compressive strength of ____ MPa (at 28 days), 37.7, 20.7, 16.5, None of the above, In Item 405 – Structural Concrete, if lean concrete is required the it should have a minimum compressive strength of ____ MPa, 27.6, 17.7, 20.7, 13.8, Structural concrete type B shall require ___ bags of cement (40kg/bag) per cubic meter of concrete., 8, 9.1, 9.5, 11, Structural concrete type B shall have a maximum water/cement ratio of ______, 0.58, 0.55, 0.53, 0.49, Structural concrete type P shall have a slump range of ____ mm, 100 max, 50 max, 75 max, 50-100, Structural concrete type A shall have a designated size of coarse aggregate of ______, 2.0" to No. 4, 1.5" to No. 4, 0.5" to No. 4, 1.0" to No. 4.

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