Item 311 Portland Cement Concrete Pavement (PART 2)

61問 • 13日前

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The Contractor shall furnish and use an accurate 300-cm straight-edge swung from _____ handles longer than one-half the width of the slab

100cm

Advances along the road shall be in successive stages of not more than ____ the length of the straight-edge

1/2

The brooming operation should be so executed that the corrugations produced in the surface shall be uniform in appearance and not more than ____ in depth

1.5mm

If the surface texture is belt finished, when straight-edging is completed and water sheen has practically disappeared and just before the concrete becomes non-plastic, the surface shall be belted with 2-ply canvas belt not less than _____, and at least _____ longer than the pavement width

20cm, 100cm

For pavement ____ or more in width, the drag shall be mounted on a bridge which travels on the forms

The dimensions of the drag shall be such that a strip of burlap or fabric at least ______ wide is in contact with the full width of pavement surface while the drag is used

100cm

The drag shall consist of not less than ___ layers of burlap

The drag shall have a bottom layer approximately ____ wider than the layer

15cm

The drag shall be maintained in such condition that the resultant surface is of uniform appearance and reasonably free from grooves over ____ in depth

1.5mm

Regardless of the method used for final finish, the hardened surface of pavement shall have a coefficient of friction of ____ or more

0.25

As soon as the concrete has hardened sufficiently, the pavement surface shall be tested with a _____________ or other specified device

3m straight-edge

Areas showing high spots of more than ____, but not exceeding ____ in 3 m shall be marked and immediately ground down with an approved grinding tool to an elevation where the area or spot will not show surface deviations in excess of 3 mm when tested with 3 m straight-edge

3mm, 12mm

Where the departure from correct cross-section exceeds ____ , the pavement shall be removed and replaced by and at the expense of the Contractor

12mm

Any area or section so removed shall be not less than ____ in length and not less than the full width of the lane involved

1.5m

When it is necessary to remove and replace a section of pavement, any remaining portion of the slab adjacent to the joints that are less than ____ in length, shall also be removed and replaced

1.5m

The concrete shall not be left exposed for more than ____ between stages of curing or during the curing period

1/2 hour

The mats used shall be of such length (or width) that as laid they will extend at least ____ the thickness of the pavement beyond the edges of the slab

twice

The mat shall be maintained fully wetted and in position for ________ after the concrete has been placed unless otherwise specified

72 hours

The top surface and sides of the pavement shall be entirely covered with waterproof paper, the units shall be lapped at least _____

45cm

The paper shall have such dimension that each unit as laid will extend beyond the edges of the slab at least twice the thickness of the pavement, or at pavement width and _____ strips of paper for the edges

60cm

Unless otherwise specified, the covering shall be maintained in place for 72 hours after the concrete has been placed

72 hours

In Straw Curing, the pavement shall be cured initially with burlap or cotton mats, until after final set of the concrete or, in any case, for _____ after placing the concrete

12 hours

As soon as the mats are removed, the surface and sides of the pavement shall be thoroughly wetted and covered with at least ____ of straw or hay, thickness of which is to be measured after wetting

20cm

Straw curing shall be kept thoroughly saturated with water for ______ and thoroughly wetted down during the morning of the fourth day, and the cover shall remain in place until the concrete has attained the required strength

72 hours

The curing compound shall be applied under pressure at the rate of ____, to not more than ____ by mechanical sprayers

4L, 14sq.m

Curing compound shall not be applied to the inside faces of joints to be sealed, but approved means shall be used to insure proper curing at least ____ and to prevent intrusion of foreign material into the joint before sealing has been completed

72 hours

The curing compound shall be of such character that the film will harden within ______ after application

30 minutes

When the film is damaged from any cause within the _____ curing period, the damaged portions shall be repaired immediately with additional compound

72 hour

The top surface and sides of the pavement shall be entirely covered with polyethylene sheeting. The units used shall be lapped at least ____

45cm

The sheeting as prepared for use shall have such dimension that each unit as laid will extend beyond the edges of the slab at least ____ the thickness of the pavement

twice

Unless otherwise specified, the covering shall be maintained in place for _____ after the concrete has been placed

72 hours

Forms for concrete shall remain in place undisturbed for not less than _____ after concrete pouring

24 hours

In case portions of the concrete are spalled, they shall be immediately repaired with fresh mortar mixed in the proportion of ____ of Portland Cement and ____ fine aggregates

1 part, 2 parts

The seals shall be installed in a compressive condition and shall at time of placement be below the level of the pavement surface by approximately ____

6mm

The concrete shall be placed with an approved slip-form paver designed to spread, consolidate, screed and float-finish the freshly placed concrete in ________ of the machine

1 complete pass

Any edge slump of the pavement, exclusive of edge rounding, in excess of ____ shall be corrected before the concrete has hardened

6mm

The concrete shall be held at a uniform consistency, having a slump of not more than _____

40cm

The contractor will be required to have materials for the protection of the edges and surface of the unhardened concrete, such protective materials shall consist of standard metal forms or wood planks having a nominal thickness of not less than _____ and a nominal width of not less than the thickness of the pavement at its edge for the protection of the pavement edges

50mm

The strength level of the concrete will be considered satisfactory if the averages of all sets of ___ consecutive strength test results equal or exceed the specified strength and no individual strength test result is deficient by more than ___ of the specified strength

3, 15%

A set for testing the strength level of the concrete shall consist of a minimum of ___ concrete beam specimens

In core test, at least ___ representative cores shall be taken from each member or area of concrete in place that is considered deficient

Concrete in the area represented by the cores will be considered adequate if the average strength of the cores is equal to at least ___, and if no single core is less than ___ of, the specified strength

85%, 75%

The road will not be opened to traffic until test specimens are molded, if such tests are not conducted prior to the specified age, the pavement shall not be operated to traffic until ___ days after the concrete was placed

The completed pavement shall be accepted on a lot basis, a lot shall be considered as _____________ of pavement when a single traffic lane is poured

1000 linear meters

When two lanes are poured concurrently, a lot shall be considered as __________

500 linear meters

The last unit in each slab constitutes a lot in itself when its length is at least ___ of the normal lot length

1/2

If the length of the last unit is shorter than ___ of the normal lot length, it shall be included with the previous lot

1/2

Small irregular areas may be included with other unit areas to form a lot. Each lot will be divided into ___ equal segments and ______ will be obtained from each segment in accordance with AASHTO T24

5, 1 core

In calculating the average thickness of the pavement, individual measurements which are in excess of the specified thickness by more than ____ will be considered as the specified thickness plus 5mm

5mm

Measurements which are less than the specified thickness by more than _____ shall not be included in the average

25mm

Individual areas within a segment found deficient in thickness by more than _____ shall be evaluated by the Engineer, and if in his judgment, the deficient areas warrant removal, they shall be removed and replaced by the Contractor with pavement of the specified thickness at his entire expense

25mm

The area of slab for which no payment will be made shall be the product of the paving width multiplied by the distance along the center line of the road between transverse sections found not deficient in thickness by more than _____

25mm

The thickness of the remainder of the segment to be used to get the average thickness of each lot shall be determined by taking the average thickness of additional cores which are not deficient by more than _____

25mm

1 quality test for every ____ bags of cement

2000

For every _______ or fraction thereof of fine aggregates a.) For a source not yet tested or failed in previous quality test: 1 – Q, Quality Test (Grading, Elutriation – wash, Bulk Specific Gravity, Absorption, Mortar Strength, Soundness, Organic Impurities, Unit Weight, % clay lumps and % shale) b.) For a source previously tested and passed quality test: 1 – Q, Quality Test (Grading, Elutriation – wash, Bulk Specific Gravity, Absorption, Mortar Strength)

1500cu.m

For every _______ or fraction thereof of fine aggregates 1 – G, Grading Test

75cu.m

For every _____ or fraction thereof of course aggregates: a.) For a source not yet tested or failed in previous quality test: 1 – Q, Quality Test (Grading, Bulk Specific Gravity, Absorption, Abrasion, Soundness and Unit Weight) b.) For a source previously tested and passed quality test: 1 – Q, Quality Test (Grading, Bulk Specific Gravity, Absorption and Abrasion)

1500cu.m

For every _______ or fraction thereof of course aggregates 1 – G, Grading Test

75cu.m

For water, 1 – Certificate from Project Engineer or 1 – ______ Test if source is questionable

Quality

For every ______ kg or fraction thereof for each size: 1 – Q, Quality Test (Bending, Tension and Quality Analysis)

10000

Flexural Strength Test on concrete beam samples: 1 – Set consisting of __ beam samples shall represent a ____ of pavement, 230 mm depth or fraction thereof placed each day

3, 330

YT1 Materials Engineer EXAM

ユーザ名非公開 · 100問 · 13日前

YT1 Materials Engineer EXAM