ME SET NEW

48問 • 11ヶ月前

問題一覧

In placing concrete for slab using buggies, the correct method will be.

Dump concrete away from previously placed concrete.

The strength of #5 steel bar that was tested for; Yield Load = 13,000 lbs. Ultimate Load = 30,000 lbs. Determine the grade of steel?

Grade 40

Scales for weighing aggregates and cement shall be accurate within ______% throughout the range of use. Scales shall be inspected and sealed as often ss the Engineer may deem necessary to assure their continued accuracy.

0.5%

Concrete admixtures used when the normal setting time is shortened by higher temperature, preventing the formation of cold joint, reduce the incidence of thermal cracking and to maintain concrete workability during large pours or long ready-mix hauls;

Retarders

An angular coarse aggregate use for concrete mix will provide more;

Water content

Thickness determination of concrete cores shall be done at;

9 measurements

No.of sets of concrete cylinder sample taken for every 75 cu.m. of concrete;

1 set (3 cylinder)

There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?

Recording

Most effective factor for strength of concrete;

Water-cement ratio

There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?

Recoring

Most effective factor for strength of concrete;

Water-cement ratio

Number of hours that concrete cylinder sample to be submitted to the laboratory before testing;

24 hours

Required weight of sample for testing for coarse aggregates use for concreting;

70 kgs

Required weight of sample for testing for fine aggregates used for concreting;

50 kgs

Most specifications for concrete exposed to weathering require that water-cement ratio;

0.53

What test of cement determines the amount of water required to prepare hydraulic cement testing?

Normal Consistency

A concrete road section was not accepted for payment because beam samples representing said section failed to meet specified strength requirements. As Materials Engineer of the project, what would you recommend?

Conduct T-core test for strength determination

_______ are materials added to the concrete mix immediate before or during mixing to modify one or more properties of concrete in the fresh or hardened state

Admixtures

________ is the heat produced by the chemical reaction of cement and water.

Heat of hydration

In breaking cylinder samples, the load should be applied at a uniform rate within the range of _______ per minute.

20 - 50 psi

Ends of cylinder samples which are not plane within ______ shall be capped.

0.050 mm

Concrete specimen molded in a 6" x 6" x 21" beam mold should be rodded

63 times

Quality determination of concrete coarse aggregate sample requires

Abrasion test and Sieve analysis

Concrete fine aggregate should be tested for

None of the preceding

Admixtures are used to

All of the preceding

improved if water-cement ratio is lowered

All of the preceding

Angular coarse aggregate will require more ______ per unit volume of concrete

both

Slump test could be used to detect

increase in water

Greatest net water is required in a concrete mix with

very fine, fine aggregate

If the concrete beam specimen is raptures during test outside the middle third, but within 5% of the span length, the formula to be used in computing the stress is

R = 3Pa/bd^2

In molding concrete cylinder specimen, each layer should be rodded _____ times.

Concrete cylinder sample should be molded in _____ equal layers

Paving concrete will need less _____ than structural concrete

Sand and Water

Tests for coarse aggregate include

abrasion and absorption

Test for fine aggregate for concrete include

gradation and mortar strength

Unless otherwise specified in the special provision, the type of Portland cement used in paving concrete shall be

Type I

The desired property of fresh concrete is

workability

The sieve used in the seperation of aggregates after the abrasion test js

1.70 mm (No. 12)

Concrete beam specimens for paving concrete are molded in

2 equal layers

A minimum cement factor of _____ bags/cu.m. of concrete for paving concrete (based on 94 lbs bags of cement)

8.5

The volume of the _______ can be calculated by performing the unit weight test on the fresh concrete

concrete

The used of manufactured fine aggregates will generally require more

mixing water

The two (2) major components of concrete are.

paste and mineral aggregates

The coarser the fine aggregates, the higher the fines modulus.

yes

The more the concrete is exposed, the greater the range of movement is.

true

The samples of RSB to be submitted for test should be at least

100 cm

For Item 311 PCCP, coarse aggregate shall have a mass percent of wear not exceeding ______ when tested by AASHTO T-96

40%

At least one (1) set of 3 cylinder samples shall be taken from ______ cu.m. of each class of concrete of fraction thereof, placed each day

M#5 Section and Title v2

ユーザ名非公開 · 32問 · 13日前

M#5 Section and Title v2