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MATERIAL ENGINEER TEST REVIEWER1. What test determined the crushing strength of aggregates to ensure that coarse aggregates willnot degrade to smaller ones.a. Abrasionb. Gradingc. Densityd. Plasticity Test2. A one-lane road, with a pavement width of 3.5m and shoulder width of 0.5m on each side of thepavement was designed to have sub-base and base coarse with a combined thickness of300mm. if the thickness of the sub-base is 125mm, the spreading and compaction of the sub-base and base coarse shall be carried out in:.a. 3 layers over the full width of 4.5mb. 2 layers over the full width of 4.5mc. 3 layers over the full width of 3.5md. 2 layers over the full width of 3.5m3. Weakened joints on concrete pavement should be saweda. Immediately after the pavement surface has been brooms finishedb. Sawing of joins shall commerce as soon as the concrete has hardened sufficiently,usually within 24 hours.c. Before the pavements opened to traffic usually 14 days from the day of pouring.4. What depth of weakened joint should at all times not be less thana. 50mmb. 60mmc. 70mmd. 75mm5. Cores are taken from a concrete pavement and tested fora. Strength verification of concrete in place that is considered adequate.b. Flexural strength determinationc. Cement content determinationd. Thickness determination6. In accepting completed concrete pavement poured by lanes thickness determination shall comeout by obtaining one core from everya. 100 metersb. 200 metersc. 500 metersd. 1000 meters7. If the strength of Item 311 control specimens does not meet the requirements by not more than25% and it is not feasible to obtain cores from the structure due to structural consideration.a. The strength of in-plane concrete will be determined by rebound a hammer. b. Pavement of concrete will be made at an adjusted pricec. No pavement will be made on the concrete represented by failed specimensd. The contractor will be required to remove and replace the concrete represented by thefailed specimens at his own expense.8. The flexure strength requirements of Item 311 isa. 500 psib. 550 psic. 3000 psid. 3500 psi9. The number of sets of beam test specimens that should be taken from 200 sq.m of concretepavements, 0.23cm thick poured on a single day should be:a. 2b. 3c. 6d. 910. Three cores taken from a pavement section poured on a single day were tested to have strengthas follows:Core1 36502 3000 86% of 3500 psi3 2450 70% of 3500 psi (fail – 75%)Average 3033 87% of 3500 psiIf the required strength is 3500 psi concrete are represented by the coresa. Maybe accepted, subject to price adjustmentb. Is considered adequatec. In considered inadequated. Maybe recorded at the initiative of the implementing office11. Forms for concrete pavement shall remain in place undisturbed for not less thana. 24 hours after concrete pouringb. The curing periodc. The period required to attain the design strengthd. 72 hours after concrete pouringEncircle your answer in each item. If you wish to change an answer, draw an X on your first answer andencircle your new answer:1. The bituminous material commonly used in item 310 isa. Asphalt emulsionb. Asphalt cementc. Liquid asphaltd. Cutback asphalt 2. Item 310 mixture shall have an index of retained strength of not less thana. 66b. 70c. 97d. 1073. Final Compaction and smoothing of Item 310 should be done by aa. Pneumatic-tired rollerb. Sheepsfoot rollerc. Vibratory rollerd. Tandem smooth wheel roller4. Item 310 mixture shall be delivered to the paver at a temperature not less thana. 66 o Cb. 97 o Cc. 107 o Cd. 110 o C5. In the asphalting of a two lane, 500m (for every 100meters) road which lasted for three days,how many core samples should be taken from the pavement if no sample was taken at the endof each day’s operation?a. 3b. 5c. 6d. 106. Which of the following provisions is not included in the job mix formulaa. Mixing timeb. Grading aggregatesc. Asphalt cementd. Temperature at delivery7. A bituminous mix subjected to immersion-compression test yielded a dry stability of 2.0 kg. andwet stability of 1.5kg. The index of retained strength of the mix isa. 0.5b. 1.33c. 33d. 0.758. In item 310, bitumen content, expressed in terms of percentage by mass of aggregate, shall bea. 3 to 5%b. 4 to 7%c. 5 to 8%d. 6 to 8%9. In the asphalting of a 3-meter wide, 200 meter long road lane, a core was obtained and testedto have a thickness of 5cm. And a density of 2.25 gm/cm^3. The quantity of bituminous mix tobe paid, in tones, isa. 65.5 b. 67.5 200*t*Gs=200*5*2.25 = 67.5c. 655d. 67510. After final rolling, the compacted asphalt pavement shall have a density equal to, or greaterthan ------% of the laboratory compacted density.a. 90b. 95c. 97d. 98Encircle your answer in each item. If you wish to change an answer, draw an X on your first answer andencircle your new answer:1. The pH value of water that is acceptable for use in concrete mix isa. 2.0 to 3.1b. 3.2 to 4.4c. 4.5 to 8.5d. 8.6 to 10.02. How many measurements are needed for thickness determination of concrete cores?a. 4b. 6c. 8d. 93. What is the strength of load bearing hollow blocks?a. 600 psib. 700 psic. 800 psid. 1000 psi4. What is the single factor that determines the strength of concrete?a. Slumpb. Water-cement ratioc. Cement factord. Gradation of aggregates5. What is the curve formed on a maximum dry density and optimum moisture content graph?a. Parabolab. Hyperbolac. Straight lined. None of the above6. The minimum testing apparatus requirements are necessary for _______ contractors.a. Smallb. Mediumc. Large
